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Watlow Controls Series 998 User manual

Manual is about: Dual Channel, 1/8 DIN, Microprocessor-Based Temperature/Process Controller

Summary of Series 998

  • Page 1

    Series 998 dual channel, 1/8 din, microprocessor-based temperature/process controller 0600-0010-000 rev g february 2000 supersedes: w998-xumn rev f $10.00 made in the u.S.A. Printed on recycled paper 10% postconsumer waste user’s manual watlow controls 1241 bundy boulevard, p.O. Box 5580, winona, mi...

  • Page 2

    Using the manual note: details of a “note” appear here in the narrow box on the outside of each page. Caution: details of a “caution” appear here in the narrow box on the outside of each page. Warning: details of a “warning” appear here in the narrow box on the outside of each page. Safety informati...

  • Page 3: Table of Contents

    Watlow series 998 user’s manual table of contents introduction starting out with the watlow series 998 i the series 998 ii display loop ii operation menus iii setup menus iii factory menus chapter 1 hardware setup 1.1 dip switch locations and functions 1.2 input type dip switches 1.3 external power ...

  • Page 4

    Notes table of contents watlow series 998 user’s manual.

  • Page 5: Introduction

    Watlow series 998 user’s manual i introduction starting out with the watlow series 998 figure i - the series 998. Tl w wa process 1a 2a 1b 2b ch a ch b display series 998 mode auto man channel a control outputs (output 1a and 2a) channel b control outputs (output 1b and 2b) optional outputs 3 and 4 ...

  • Page 6

    Introduction introduction ii watlow series 998 user’s manual from the display loop, press the mode key µ to reach the operation menus. To return to the display loop from any point in any menu, press the display key ∂ . From the display loop, press both the up-arrow and down-arrow keys > and for thre...

  • Page 7

    Introduction watlow series 998 user’s manual iii introduction from the setup menus, press both the up-arrow and down-arrow keys > and for three seconds to reach the factory menus. To return to the display loop from any point in any menu, press the display key ∂ . [otpt] [`set] [ot1a] [hy1a] [ot2a] [...

  • Page 8

    Iv watlow series 998 user’s manual notes introduction.

  • Page 9: Chapter 1 Hardware Setup

    Watlow series 998 user’s manual 1.1 hardware setup, chapter 1 dip switch locations and functions the watlow series 998 has at least one and as many as six dual in-line package (dip) switches inside the controller, depending on the model number. They allow users to configure the controller for a vari...

  • Page 10

    1.2 watlow series 998 user’s manual hardware setup, chapter 1 dip switches figure 1.2 - input dip switches. Input 1 (channel a) input 2 (channel b) (99__-2___-____) (99__-_2__-____) rtd thermocouple: r, s or b thermocouple: j, k, t, n, e, c, d, pt2 0-20 or 4-20ma; 0-5, 1-5 or 0-10v o n ↑ 1 2 3 o n ↑...

  • Page 11

    Dip switches watlow series 998 user’s manual 1.3 hardware setup, chapter 1 control chassis top view (996 & 998) left-side view (997 & 999) lockout dip on off on off on off output 4 option board and dip output 3 option board and dip figure 1.3 - external signal con- ditioner power sup- ply dips. Outp...

  • Page 12

    1.4 watlow series 998 user’s manual hardware setup, chapter 1 dip switches figure 1.4 - lockout dip switch. No hardware lockout or (switch 1 has no effect.) lockout setup and factory menus or (switch 1 has no effect.) o n ↑ 1 2 o n ↑ 1 2 o n ↑ 1 2 o n ↑ 1 2 control chassis top view (996 & 998) left-...

  • Page 13

    Watlow series 998 user’s manual 2.1 installation and wiring, chapter 2 figure 2.1a - series 998 panel cutout dimensions. Figure 2.1b - series 998 dimensions. Note: adjustable mount- ing brackets can also be side mount- ed. Panel cutout maximum panel thickness 0.38" (9.65mm) 3.62" + 0.03 -0.00 (92mm ...

  • Page 14

    Installing installation and wiring, chapter 2 2.2 watlow series 998 user’s manual installing the series 998 installing and mounting requires access to the back of the panel. 1. Make a panel cutout. 2. To remove the controller chassis from its case, press in firmly on the two tabs on one side or the ...

  • Page 15

    Installing watlow series 998 user’s manual 2.3 installation and wiring, chapter 2 4. Loosen the mounting bracket screws enough to allow for the mounting collar and panel thickness. Place each mounting bracket into the mounting slots (head of the screw facing the back of the controller). Push each br...

  • Page 16

    Wiring installation and wiring, chapter 2 2.4 watlow series 998 user’s manual wiring the series 998 wiring options depend on the model number and dip switch settings. Check the terminal designation stickers on either side of the controller and compare your model number to those shown here and with t...

  • Page 17

    24 23 +24v Î (dc) 10k Ω 4.99k Ω opto isolator 750 Ω .01 µ f 4.99k Ω internal circuitry wiring event input 1 standard on all units 14 - 36v Î (dc) event input 1 off (open) 0 - 3v Î (dc) event input 1 on (closed) or 23 24 23 24 + - wiring 0-20 and 4-20ma process inputs certain “transmitters” used in p...

  • Page 18

    Wiring example installation and wiring, chapter 2 2.6 watlow series 998 user’s manual figure 2.6 - system wiring examples. ➥ series 146 limit control 146e-1601-3000 high- temperature light high-limit mechanical control fuse mercury relay humidify dehumidify earthground fuse l1 l2 l1 l2 12 13 14 15 1...

  • Page 19

    Wiring notes watlow series 998 user’s manual 2.7 installation and wiring, chapter 2 l1 l2 power earth ground 11 21 22 ç warning: to avoid damage to property and equip- ment, and/or injury or loss of life, use national electric code (nec) stan- dard wiring prac- tices to install and operate the serie...

  • Page 20

    Figure 2.8a — thermocouple thermocouple only 99 _ _ - 1 _ _ _ - _ _ _ _ universal signal conditioner 99 _ _ - 2 _ _ _ - _ _ _ _ figure 2.8b — rtd, 2- or 3-wire universal signal conditioner 99 _ _ - 2 _ _ _ - _ _ _ _ figure 2.8c — 0-5v Î Î , 1-5v Î Î or 0-10v Î Î (dc) process universal signal conditi...

  • Page 21

    Watlow series 998 user’s manual 2.9 installation and wiring, chapter 2 channel b input wiring figure 2.9a — thermocouple thermocouple only 99 _ _ - _ 1 _ _ - _ _ _ _ universal signal conditioner 99 _ _ - _ 2 _ _ - _ _ _ _ figure 2.9b — rtd, 2- or 3-wire 99 _ _ - _ 2 _ _ - _ _ _ _ figure 2.9c — 0-5v ...

  • Page 22

    Installation and wiring, chapter 2 2.10 watlow series 998 user’s manual channel a output wiring figure 2.10a — ac outputs • dual electromechanical relays without contact suppression dual form a, 2 amps off-state impedance: 31m Ω 99 _ _ - _ _ e _ - _ _ _ _ • dual solid-state relay without contact sup...

  • Page 23

    Watlow series 998 user’s manual 2.11 installation and wiring, chapter 2 figure 2.11a — ac outputs • dual electromechanical relay without contact suppression dual form a, 2 amps off-state impedance: 31m Ω 99 _ _ - _ _ _ e - _ _ _ _ • dual solid-state relay without contact suppression 0.5 amps off-sta...

  • Page 24

    Installation and wiring, chapter 2 2.12 watlow series 998 user’s manual figure 2.12a — ac outputs • solid-state relay with contact suppression 0.5 amps off-state impedance: 20k Ω min. 99 _ _ - _ _ _ _ - b _ _ _ • electromechanical relay without contact suppression form a or b, 5 amps off-state imped...

  • Page 25

    Watlow series 998 user’s manual 2.13 installation and wiring, chapter 2 output 4 wiring figure 2.13a — ac outputs • solid-state relay with contact suppression 0.5 amps off-state impedance: 20k Ω min. 99 _ _ - _ _ _ _ - _ b _ _ • solid-state relay without contact suppression 0.5 amps off-state impeda...

  • Page 26

    Notes installation and wiring, chapter 2 2.14 watlow series 998 user’s manual.

  • Page 27: Chapter 3 Keys and Displays

    Upper display indicates either actual process value for channel a or channel b, the operating prompt values, or error codes. When powering up, the display will be blank for 3 seconds. Red or green, 0.4” (10mm) high, seven-segment, four-digit led display. Ch a indicator light when lit, if the ch b li...

  • Page 28

    Keys and displays, chapter 3 3.2 watlow series 998 user’s manual display loop display key and loop on power up, the series 998 displays the channel a set point value in the lower display and the channel a process value in the upper display and the ch a (channel a) indicator light is on. Press the di...

  • Page 29: Chapter 4 The Setup Menus

    Tl w wa process 1a 2a 1b 2b ch a ch b display series 998 mode auto man tl w wa process display mode 1a 2a 1b 2b ch a ch b series 998 auto man watlow series 998 user’s manual 4.1 setup menus, chapter 4 navigating the setup menus to reach the setup menus, begin in the display loop and press both the u...

  • Page 30

    4.2 watlow series 998 user’s manual setup menus, chapter 4 figure 4.2 - the input menu. Setup-input ❸ select the input menu, then press the mode key µ to step through the prompts. ❹ press the up-arrow key > or the down-arrow key one of the prompt values. [```)] [dec1] [``)0] [dec1] [)000] [dec1] [`)...

  • Page 31

    Watlow series 998 user’s manual 4.3 setup menus, chapter 4 setup-input temperature and relative humidity when the controller will be used to measure temperature and relative humidity, channel a is designated as the temperature channel and chan- nel b is the humidity channel. Any sensor type may be u...

  • Page 32

    4.4 watlow series 998 user’s manual setup menus, chapter 4 setup-input rotronic model h260 capacitive relative humidity sensor with the rotronic configuration, channel a is used to measure temperature and channel b must be a process input with the input 2 linearization prompt [lin2] set to [h260]. T...

  • Page 33

    Watlow series 998 user’s manual 4.5 setup menus, chapter 4 input prompts when you are in the setup menus, the series 998 displays the menu selection ( [inpt], [otpt], [glbl] or [com] ) in the upper display, and [`set] in the lower display. The up-arrow > or down-arrow mode key µ to display the funct...

  • Page 34

    4.6 watlow series 998 user’s manual setup menus, chapter 4 [`in1] input 1 continued from previous page. Setup-input if default ↓ ↓ input 1 dip rtd rtd(0.1°) [`rtd] [`r†d] [`in1] [`in1] rtd input 1 dip 4-20ma 0-20ma 0-5v Î 1-5v Î 0-10v Î (dc) [4-20] [0-20] [`0-5] [`1-5] [0-10] [`in1] [`in1] [`in1] [`...

  • Page 35

    Watlow series 998 user’s manual 4.7 setup menus, chapter 4 setup-input note: these values do not affect the low or the high set point limit for process alarms. Range low 1 and range high 1 select the low and high limits for channel a. These prompts limit the adjustment range for the set points. The ...

  • Page 36

    4.8 watlow series 998 user’s manual setup menus, chapter 4 setup-input note: these values do not affect the low or the high set point limit for process alarms. [`rl1] [`rh1] range low 1 and range high 1 continued from previous page. Default default default default ↓ ↓ ↓ ↓ [``°f] [``°c] [`rl1] [`rh1]...

  • Page 37

    Watlow series 998 user’s manual 4.9 setup menus, chapter 4 rtd calibration curve 1 select the calibration curve for the channel a rtd. The rtd input uses either the european (din, 0.003850 Ω / Ω /°c) or the japanese (jis, 0.003916 Ω / Ω /°c) linearization standard. [rtd1] this prompt appears only if...

  • Page 38

    4.10 watlow series 998 user’s manual setup menus, chapter 4 setup-input note: if [``no] is selected for [`in2] none of the other input 2 prompts will appear. Input 2 select sensor type for channel b. This selection must match the sensor type con- nected to terminals 18, 19 and 20. See the appendix f...

  • Page 39

    Watlow series 998 user’s manual 4.11 setup menus, chapter 4 setup-input decimal 2 select the decimal point location for channel b data. This prompt, in conjunction with the range low and range high prompts, allows you to format and limit units of measure for channel b. • all prompts with units of me...

  • Page 40

    4.12 watlow series 998 user’s manual setup menus, chapter 4 setup-input default default default default ↓ ↓ ↓ ↓ [``°f] [``°c] [`rl2] [`rh2] [`rl2] [`rh2] [```j] [``32] … [1500] [```0] … [`816] 99__-1__-___ or [`in2] [`rl2] [`rh2] [`rl2] [`rh2] 99__-2__-___ (k) [```h] [-328] … [2500] [-200] … [1371] ...

  • Page 41

    Watlow series 998 user’s manual 4.13 setup menus, chapter 4 calibration offset 2 offset the channel b signal by a positive or negative value. This allows you to compensate for lead resistance, sensor errors or other factors. [cal2] this prompt appears only if [`in2] is not set to [``no]. If default ...

  • Page 42

    Setup menus, chapter 4 setup-input software filter 2 select the filter time constant, in seconds, for channel b. This smooths a rapidly changing input signal for display or control purposes. • select a positive value to filter only the display. • select a negative value to filter the input signal. •...

  • Page 43

    Watlow series 998 user’s manual 4.15 setup menus, chapter 4 notes.

  • Page 44

    4.16 watlow series 998 user’s manual setup menus, chapter 4 setup-output ❸ press the mode key µ to step through the output prompts. ❷ press the up-arrow key > to select one of the setup menus. Reaching the output menu ❶ begin in the display loop, and press the up-arrow > and down-arrow neously for t...

  • Page 45

    Watlow series 998 user’s manual 4.17 setup menus, chapter 4 setup-output output prompts when you are in the setup menus, the series 998 displays the menu selection ( [inpt], [otpt], [glbl] or [com] ) in the upper display, and [`set] in the lower display. The up-arrow > or down-arrow mode key µ to di...

  • Page 46

    4.18 watlow series 998 user’s manual setup menus, chapter 4 setup-output hysteresis 1a select the switching hysteresis for output 1a. This determines the change in temperature or process units needed to turn the output from full on to full off. [hy1a] this prompt does not appear if output 1 is a pro...

  • Page 47

    Watlow series 998 user’s manual 4.19 setup menus, chapter 4 setup-output output 2a set the way that output 2a will respond to a difference between the set point and an input variable. • [``ht] select reverse action, so that output 2a responds when the input signal is less than the set point. This pr...

  • Page 48

    4.20 watlow series 998 user’s manual setup menus, chapter 4 setup-output hysteresis 2a select the switching hysteresis for output 2a. This determines the change in temperature or process units needed to turn the output from full off to full on. [hy2a] this prompt does not appear if output 2 is a pro...

  • Page 49

    Watlow series 998 user’s manual 4.21 setup menus, chapter 4 setup-output output 1b set the way that output 1b will respond to a difference between the set point and an input variable. • [``ht] select reverse action, so that output 1b responds when the input signal is less than the set point. • [``cl...

  • Page 50

    4.22 watlow series 998 user’s manual setup menus, chapter 4 setup-output output 2b set the way that output 2b will respond to a difference between the set point and an input variable. • [``ht] select reverse action, so that output 2b responds when the input signal is less than the set point. • [``cl...

  • Page 51

    Watlow series 998 user’s manual 4.23 setup menus, chapter 4 setup-output process b select the process range for output b. [prcb] this prompt appears only on controllers equipped with output b process hardware (99__-___f-____). Default ↓ 4-20ma 0-20ma 0-5v Î 1-5v Î 0-10v Î (dc) [4-20] [0-20] [`0-5] [...

  • Page 52

    4.24 watlow series 998 user’s manual setup menus, chapter 4 alarm 3 select the alarm channel and type for alarm 3. Select the trigger points for the alarm with the [a3lo] and [a3hi] settings in the system menu [`sys]. • [`pra] uses the process signal from channel a. Changing the set point does not c...

  • Page 53

    Watlow series 998 user’s manual 4.25 setup menus, chapter 4 setup-output hysteresis 3 select the switching hysteresis for alarm 3. This determines the change in temperature or process units needed to turn the output from full off to full on. • if the input referenced by [`al3] is set to [`r†d] the r...

  • Page 54

    4.26 watlow series 998 user’s manual setup menus, chapter 4 setup-output latching 3 select whether alarm 3 will be latching or non-latching. A latching alarm [`lat] must be turned off manually. A non-latching alarm [`nla] turns off when an alarm condition no longer exists. [lat3] this prompt appears...

  • Page 55

    Watlow series 998 user’s manual 4.27 setup menus, chapter 4 setup-output output 4 set the alarm type for output 4. • [`al4] de-energizes output 4 in an alarm condition. • [al4n] energizes output 4 in an alarm condition. [`ot4] this prompt appears only on controllers equipped with output 4 hardware f...

  • Page 56

    4.28 watlow series 998 user’s manual setup menus, chapter 4 setup-output [hys4] [lat4] hysteresis 4 select the switching hysteresis for alarm 4. This determines the change in temperature or process units needed to turn the output from full off to full on. • if the input referenced by [`al4] is set t...

  • Page 57

    Watlow series 998 user’s manual 4.29 setup menus, chapter 4 setup-output silencing 4 select silencing to inhibit alarm 4 on startup and to allow the opera- tor to reset the alarm output, not the visual display. • silencing disables the alarm until the signal is between [a4lo] and [a4hi]. [sil4] this...

  • Page 58

    4.30 watlow series 998 user’s manual setup menus, chapter 4 process 3 select the range for the retransmit signal at output 3. [prc3] this prompt appears only on controllers equipped with output 3 retransmit hardware (99__-____-m___ or 99__-____-n___) and with [aout] not set to [``no]. Default ↓ 4-20...

  • Page 59

    Watlow series 998 user’s manual 4.31 setup menus, chapter 4 setup-output retransmit high limit select the high limit for the retransmit signal at output 3. • the default value is equal to [`rh1] or [`rh2] (in the input menu) depending on whether [aout] is set to [prca] or [prcb]. [`arh] this prompt ...

  • Page 60

    4.32 watlow series 998 user’s manual setup menus, chapter 4 setup-global ❸ press the mode key µ to step through the prompts. ❹ press the up-arrow key > or the down-arrow key one of the prompt values. ❶ begin in the display loop, and press the up-arrow > and down- arrow three seconds to reach the set...

  • Page 61

    Watlow series 998 user’s manual 4.33 setup menus, chapter 4 global prompts when you are in the setup menus, the series 998 displays the menu selection ( [inpt], [otpt], [glbl] or [com] ) in the upper display, and [`set] in the lower display. The up-arrow > or down-arrow key the mode key µ to display...

  • Page 62

    4.34 watlow series 998 user’s manual setup menus, chapter 4 setup-global error latching select whether input errors will be latching or non-latching. • [`nla] non-latching errors turn off when there is no error condition. • [`lat] latching errors must be turned off manually. [`err] this prompt alway...

  • Page 63

    Watlow series 998 user’s manual 4.35 setup menus, chapter 4 annunciator select whether alarm messages will flash in the lower display. [anun] this prompt always appears. Default ↓ [``on] [`off] [anun] [anun] auto-tune set point select the percentage at which the controller will auto-tune the cur- re...

  • Page 64

    4.36 watlow series 998 user’s manual setup menus, chapter 4 ramp rate for channel a set the rate of heating for channel a. [rt`a] this prompt appears when [rp`a] is set to [strt] or [stpt]. Default ↓ [```0] … [`100] … [9999] degrees/minute [rt`a] [rt`a] [rt`a] ramping function for channel b select w...

  • Page 65

    Watlow series 998 user’s manual 4.37 setup menus, chapter 4 notes.

  • Page 66

    4.38 watlow series 998 user’s manual setup menus, chapter 4 setup-communications reaching the communications menu ❶ begin in the display loop, and press the up-arrow > and down-arrow simultaneously for three seconds to reach the setup menus. ❷ press the up-arrow key > to select one of the setup menu...

  • Page 67

    Watlow series 998 user’s manual 4.39 setup menus, chapter 4 setup-communications communications prompts when you are in the setup menus, the series 998 displays the menu selection ( [inpt], [otpt], [glbl] or [com] ) in the upper display, and [`set] in the lower display. The up-arrow > or down-arrow ...

  • Page 68

    4.40 watlow series 998 user’s manual setup menus, chapter 4 setup-communications protocol type select the communications protocol. • [full] selects ansi x3.28 2.2 - a.3. • [``on] selects xon/xoff. [prot] this prompt appears only on controllers equipped with communi- cations hardware (99__-____-_r__ ...

  • Page 69

    Tl tl w wa process display mode 1a 2a 1b 2b ch a ch b series 998 auto man [`998] [`998] tl tl w wa process display mode 1a 2a 1b 2b ch a ch b series 998 auto man [`sys] [oper] watlow series 998 user’s manual 5.1 operation menus, chapter 5 navigating the operation menus to reach the operation menus, ...

  • Page 70

    5.2 watlow series 998 user’s manual operation menus, chapter 5 figure 5.2 - the system menu. ❸ select the system menu, then press the mode key to step through the prompts. ❹ press the up-arrow key to step through the prompt values. The down-arrow key backs through the values. … … … [-999] [a3lo] [-9...

  • Page 71

    Operation-system watlow series 998 user’s manual 5.3 operation menus, chapter 5 system prompts after you step past the set point 2a prompt [sp2a] and the set point 2b prompt [sp2b] to the operation menus, the series 998 displays the menu selection ( [`sys], [pida] or [pidb] ) in the upper display an...

  • Page 72

    5.4 watlow series 998 user’s manual operation menus, chapter 5 operation-system event input 1 status indicates whether the event input 1 circuit is energized, [clos], or de-energized, [open]. This is a read-only prompt. [ei1s] this prompt appears only if [`ei1] (global menu) is set to some- thing ot...

  • Page 73

    Watlow series 998 user’s manual 5.5 operation menus, chapter 5 operation-system alarm 3 low select the low trigger value for the output 3 alarm. [a3lo] this prompt appears only if [`ot3] (output menu) is set to [`al3] or [al3n]. If default ↓ ↓ lowest [`pra] or [`prb] value of … value of … [a3hi] [`a...

  • Page 74

    5.6 watlow series 998 user’s manual operation menus, chapter 5 operation-system alarm 4 low select the low trigger value for the output 4 alarm. [a4lo] this prompt appears only if [`ot4] (output menu) is set to [`al4] or [al4n]. If default ↓ ↓ lowest [`pra] or [`prb] value of … value of … [a4hi] [`a...

  • Page 75

    Watlow series 998 user’s manual 5.7 operation menus, chapter 5 operation-system auto-tune initiate an auto-tune. [`aut] this prompt always appears. Default ↓ [`off] [pida] [pidb] [`aut] [`aut] [`aut] note: for more informa- tion on auto-tune see chapter 7. [`aut].

  • Page 76

    5.8 watlow series 998 user’s manual operation menus, chapter 5 system menu p. 5.2 pid a menu p. 5.8 pid b menu p. 5.13 [`998] [sp2a] set point 2a [`998] [sp2b] set point 2b µ µ [`sys] [oper] [pida] [oper] [pidb] [oper] > > > ❶ begin in the display loop, and press the mode key µ to reach the set poin...

  • Page 77

    Watlow series 998 user’s manual 5.9 operation menus, chapter 5 operation-pid a pid a prompts after you step past the set point 2a prompt [sp2a] and the set point 2b prompt [sp2b] to the operation menus, the series 998 displays the menu selection ( [`sys], [pida] or [pidb] ) in the upper display and ...

  • Page 78

    5.10 watlow series 998 user’s manual operation menus, chapter 5 operation-pid a reset, output 1a or 2a adjust the control action to eliminate the offset or droop between the set point and the actual process temperature for pid channel a out- puts. When set to [```0] reset is disabled. [re1a] this pr...

  • Page 79

    Watlow series 998 user’s manual 5.11 operation menus, chapter 5 operation-pid a rate, output 1a or 2a adjust the rate to eliminate overshoot on startup or after the set point changes. The rate setting will not influence the percent power if the process temperature is more than twice the proportional...

  • Page 80

    5.12 watlow series 998 user’s manual operation menus, chapter 5 operation-pid a cycle time, output 1a or 2a select the time, in seconds, of a complete on/off cycle. [ct1a] this prompt does not appear if the output is a process output or [pb1a] is not set higher than [```0]. If default ↓ ↓ mechanical...

  • Page 81

    Watlow series 998 user’s manual 5.13 operation menus, chapter 5 operation-pid b *prompts may not appear, depending on controller configuration. → [pidb] channel b pid menu µ [oper] operation menus ↓ ? µ [pb1b] proportional band, output 1b (page 5.14) ↓ ? µ [re1b] *reset, output 1b ↓ ? µ [it1b] *inte...

  • Page 82

    5.14 watlow series 998 user’s manual operation menus, chapter 5 operation-pid b pid b prompts after you step past the set point 2a prompt [sp2a] and the set point 2b prompt [sp2b] to the operation menus, the series 998 displays the menu selection ( [`sys], [pida] or [pidb] ) in the upper display and...

  • Page 83

    Watlow series 998 user’s manual 5.15 operation menus, chapter 5 operation-pid b reset, output 1b or 2b adjust the control action to eliminate the offset or droop between the set point and the actual process temperature for pid channel b out- puts. When set to [```0] reset is disabled. [re1b] this pr...

  • Page 84

    5.16 watlow series 998 user’s manual operation menus, chapter 5 operation-pid b rate, output 1b or 2b adjust the rate to eliminate overshoot on startup or after the set point changes. The rate setting will not influence the percent power if the process temperature is more than twice the proportional...

  • Page 85

    Watlow series 998 user’s manual 5.17 operation menus, chapter 5 operation-pid b cycle time, output 1b or 2b select the time, in seconds, of a complete on/off cycle. [ct1a] this prompt does not appear if the output is a process output or [pb1a] is not set higher than [```0]. If default ↓ ↓ mechanical...

  • Page 86

    5.18 watlow series 998 user’s manual operation menus, chapter 5 notes.

  • Page 87: Chapter 6 The Factory Menus

    Tl tl w wa process display mode 1a 2a 1b 2b ch a ch b series 998 auto man [inpt] [`set] tl tl w wa process display mode 1a 2a 1b 2b ch a ch b series 998 auto man [ploc] [fcty] watlow series 998 user’s manual 6.1 factory menus, chapter 6 navigating the factory menus to reach the factory menus, begin ...

  • Page 88

    Tl tl w wa process display mode 1a 2a 1b 2b ch a ch b series 998 auto man [ploc] [fcty] 6.2 watlow series 998 user’s manual factory menus, chapter 6 figure 6.2 - the panel lockout menu. Factory-panel lockout ❸ select the panel lockout menu [ploc] , then press µ to step through the prompts. ❹ press >...

  • Page 89

    Factory-panel lockout watlow series 998 user’s manual 6.3 factory menus, chapter 6 ç caution: setting [`loc] to [```2] or [```3] disables the auto/man key å and will force the controller into man- ual mode if an open sensor occurs. Verify that the con- troller is operating in the desired mode (auto ...

  • Page 90

    6.4 watlow series 998 user’s manual factory menus, chapter 6 factory-panel lockout system menu lockout select the lockout level for the system menu. Set the lockout to no lockout [none], read only [read] or full lockout [full]. [`loc] this prompt always appears. Default ↓ [none] [read] [full] [`sys]...

  • Page 91

    Watlow series 998 user’s manual 6.5 factory menus, chapter 6 factory-panel lockout input menu lockout select the lockout level for the input menu. Set the lockout to no lock- out [none], read only [read] or full lockout [full]. [inpt] this prompt always appears. Default ↓ [none] [read] [full] [inpt]...

  • Page 92

    6.6 watlow series 998 user’s manual factory menus, chapter 6 factory-panel lockout communications menu lockout select the lockout level for the communications menu. Set the lock- out to no lockout [none], read only [read] or full lockout [full]. [com] this prompt appears only if the controller is eq...

  • Page 93

    Watlow series 998 user’s manual 6.7 factory menus, chapter 6 notes.

  • Page 94

    → [diag] diagnostics menu µ [fcty] factory menu prompt ↓ ? µ [date] factory ship date ↓ ? µ [soft] software revision ↓ [sn--] µ [----] serial number ↓ ? µ [amb] ambient temperature ↓ ? µ [`gnd] ground a/d count ↓ ? µ [`ref] ambient a/d count ↓ ? µ [cnt1] input 1 a/d count ↓ ? µ [cnt2] input 2 a/d co...

  • Page 95

    Watlow series 998 user’s manual 6.9 factory menus, chapter 6 factory-diagnostics factory ship date shows the date that the final factory control test was performed. The first two digits represent the week as numbered from [01--] to [52--]. The second two digits represent the year [--94], [--95], etc...

  • Page 96

    6.10 watlow series 998 user’s manual factory menus, chapter 6 factory use only these prompts are used only at the factory. [acnt] [`gnd] [cnt1] [cnt2] these prompts always appear. Inputs 1 and 2 module types display which input module is installed in the controller. Please docu- ment this value befo...

  • Page 97

    Watlow series 998 user’s manual 6.11 factory menus, chapter 6 factory-diagnostics outputs 1, 2, 3 and 4 module types display the controller’s output module. Please document this value before contacting the factory for technical assistance. Output types • [none] no output module (a) • [ssr1] 0.5a sol...

  • Page 98

    6.12 watlow series 998 user’s manual factory menus, chapter 6 factory-diagnostics test displays runs a brief test of the controller’s displays and leds. To run the test, scroll through the diagnostics menu until [disp] is shown in the lower display. Use the up-arrow key > or down-arrow key [`yes] fr...

  • Page 99

    Watlow series 998 user’s manual 6.13 factory menus, chapter 6 notes.

  • Page 100

    6.14 watlow series 998 user’s manual factory menus, chapter 6 factory-calibration → [`cal] calibration menu µ [fcty] factory menus ↓ ? µ [a`50] input 1 ↓ ? µ [a`00] ↓ ? µ [``tc] ↓ ? µ [a`oh] ↓ ? µ [a`20] ↓ ? µ [a`15] ↓ ? µ [a380] ↓ ? µ [a10u] ↓ ? µ [a`0u] ↓ ? µ [a20a] ↓ ? µ [a`4a] ↓ ? µ [a`0u] ↓ ? µ...

  • Page 101

    Watlow series 998 user’s manual 6.15 factory menus, chapter 6 factory-calibration restore restores the original factory calibration values. This is a simple way to recover if you make a mistake calibrating the controller. [`rst] this prompt always appears. Default ↓ [``no] [`yes] [`rst] [`rst] defau...

  • Page 102

    6.16 watlow series 998 user’s manual factory menus, chapter 6 notes.

  • Page 103: Chapter 7 Tuning, Manual

    Watlow series 998 user’s manual 7.1 tuning, alarms and error codes, chapter 7 auto-tuning (heat and/or cool) the series 998 can automatically tune the pid parameters for both channel a and channel b to fit the characteristics of your particular sys- tem. Only one channel’s pid set can be auto-tuned ...

  • Page 104

    Tuning tuning, alarms and error codes, chapter 7 7.2 watlow series 998 user’s manual tuning ç to start auto-tuning: 1. Press the mode key µ until the [`aut] prompt appears in the lower display. 2. Use the up-arrow or down-arrow key > [`pidb] depending on which channel you want to tune. Only one pid ...

  • Page 105

    Auto/manual operation watlow series 998 user’s manual 7.3 tuning, alarms and error codes, chapter 7 and [``ra] or [``de] are inoperative, and the 998 functions as a sim- ple on/off control.) the [``hy] (hysterisis) prompt determines the switching differential value. 3. Reset/integral adjustment: gra...

  • Page 106

    Alarms tuning, alarms and error codes, chapter 7 7.4 watlow series 998 user’s manual in manual operation. Note: it cannot be determined which channel is in the manual mode when both ch a and ch b lights are on. When the auto/manual light is off, the channel is in automatic operation. When the auto/m...

  • Page 107

    Alarms watlow series 998 user’s manual 7.5 tuning, alarms and error codes, chapter 7 a flashing lower display indicates an alarm state. Note: if the [anun] parameter in the global menu is set to [`off] the lower display will not flash and there will be no indication of an alarm state on the front pa...

  • Page 108

    Error code e1 and e2 messages four dashes, [----], in the upper display indicate a series 998 error. The associated channel goes to 0% output. To view the error code press the auto/man key once. The upper display shows the error code for five sec- onds before returning to the [----] display. [e1`1] ...

  • Page 109

    Error code actions error codes [`er3], [`er4], [`er5] or [`er9] will result in these con- ditions • the control is in auto operation with both control outputs off. • the alarm outputs are in their alarm state (de-energerzed with the indi- cator light on). • the lower display is blank. • the upper di...

  • Page 110

    Error codes tuning, alarms and error codes, chapter 7 7.8 watlow series 998 user’s manual to clear an error code: • if [`err] is set to [`nla], the error code should clear once the problem is corrected. • if [`err] is set to [`lat], correct the problem and cycle power. You can also clear the error b...

  • Page 111: Chapter 8 Applications

    Watlow series 998 user’s manual 8.1 applications, chapter 8 this chapter details many of the 998 features unique to watlow controls. Some of this material is advanced and requires previous background or experience. What we will cover in this chapter: standard features • burst fired, zero cross outpu...

  • Page 112

    Retransmit applications, chapter 8 8.2 watlow series 998 user’s manual retransmit when output 3 is ordered as a process retransmit output, channel a set point or process value (input 1) or channel b set point or process value (input 2) can be configured for retransmit. For accurate readings when ret...

  • Page 113

    Misc. Features watlow series 998 user’s manual 8.3 applications, chapter 8 dead band the dead band prompts, [db`a] and [db`b], determine the amount of interaction between heat (reverse acting) and cool (direct acting) control outputs for channel a and b respectively. Dead band directly offsets the c...

  • Page 114

    Notes applications, chapter 8 8.4 watlow series 998/999 user’s manual.

  • Page 115

    Watlow series 998 user’s manual a.1 appendix warranty/returns warranty the watlow series 998 is warranted to be free of defects in material and workmanship for 36 months after delivery to the first purchaser for use, providing that the units have not been misapplied. Since watlow has no control over...

  • Page 116

    A.2 watlow series 998 user’s manual appendix annunciator — a visual display that uses pilot lights to indicate the former or existing condition of several items in a system. Burst fire — a power control method that repeatedly turns on and off full ac cycles. Also called zero-cross fire, it switches ...

  • Page 117

    Watlow series 998 user’s manual a.3 appendix glossary, n-r mocouple circuit held at a stable, known tempera- ture (cold junction). Standard reference temperature is 32°f (0°c). Nema 4x — a nema specification for determining resistance to moisture infiltration. This rating certi- fies the controller ...

  • Page 118

    A.4 watlow series 998 user’s manual appendix glossary, r-z rtd — see resistance temperature detector. Thermal system — a regulated environment that con- sists of a heat source, heat transfer medium or load, sensing device and a control instrument. Thermocouple (t/c) — a temperature sensing device ma...

  • Page 119: 998 Index

    Watlow series 998 user’s manual a.5 appendix 998 index % out led 3.1 0-20ma or 4-20ma process 2.8, 2.9, 2.10, 2.11 0-5v Î , 1-5v Î , 0-10v Î (dc) process 2.8, 2.9, 2.10, 2.11 1a, 2a, 1b, 2b indicator lights 3.1 a ac outputs 2.10, 2.11, 2.12, 2.13 address of controller 4.40 alarm 3 4.24 alarm 3 high ...

  • Page 120

    A.6 watlow series 998 user’s manual appendix proportional band, output 1a 5.9 proportional band, output 1b 5.14 proportional band, output 2a 5.9 proportional band, output 2b 5.14 protocol type 4.40 r ramping function, channel a 4.35 ramping function, channel b 4.36 ramp rate, channel a 4.36 ramp rat...

  • Page 121: Prompt Index

    Watlow series 998 user’s manual a.7 appendix index prompt index a [a3hi] alarm 3 high 5.5 [a3lo] alarm 3 low 5.5 [a4hi] alarm 4 high 5.6 [a4lo] alarm 4 low 5.6 [acal] retransmit calibration offset 4.31 [addr] address 4.40 [`al3] alarm 3 4.24 [`al4] alarm 4 4.27 [`alt] altitide compensation 4.14 [amb...

  • Page 122

    A.8 watlow series 998 user’s manual appendix specifications specifications — (1908) control mode • dual input, six output, optional retransmit of set point or process variable. • programmable direct- and reverse-acting control outputs per chan- nel. • one-step auto-tuning. Agency approvals • ul #873...

  • Page 123

    Watlow series 998 user’s manual a.9 appendix model number 1 electromechanical relays warranted for 100,000 closures only. Solid-state switching devices recommended for applications requiring fast cycle times or extended service life. 2 not an ansi symbol. Ul ® is a registered trademark of the underw...

  • Page 124: Declaration of Conformity

    Erwin d. Lowell winona, minnesota, usa name of authorized representative place of issue general manager january 24, 1996 title of authorized representative date of issue ________________________________________ signature of authorized representative declaration of conformity series 996, 997, 998, 99...

  • Page 125

    Watlow series 998 user’s manual a.11 appendix notes.

  • Page 126

    Watlow series 998 user’s manual watlow controls, 1241 bundy boulevard, p.O. Box 5580, winona, minnesota usa 55987-5580 phone: (507) 454-5300, fax: (507) 452-4507 http://www.Watlow.Com.