Wavelength Electronics LFI-3500 Series User Manual
Summary of LFI-3500 Series
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Tm lfi-3500 series temperature controllers user’s guide.
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Page 3: Lfi-3500 Series
3 lfi-3500 series temperature controller user’s guide publication number 92-130002d © copyright 1996, 1997, wavelength electronics, inc. P o box 865, bozeman, mt 59771 all rights reserved printed in u. S. A..
Page 4: Key Features...
4 thermoelectric temperature controllers the 3500 series advanced designoffers an unprecedented combination of features, performance, and value. A variety of sensors including thermistors, ic sensors (ad590 and lm335), and rtds are supported. A versatile i/o analog interface is provided at no additi...
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5 lfi 3500 series selection guide model description lfi-3525 15 w, 2.5 amp, 6 volt, temperature controller lfi-3526 22 w, 2.5 amp, 9 volt, temperature controller lfi-3550 25 w, 5.0 amp, 5 volt, temperature controller lfi-3551 40 w, 5.0 amp, 8 volt, temperature controller each model includes: 9&15 pi...
Page 6: Rear Panel:
6 default configuration from the factory the following are the factory default settings. Rear panel: configuration switch: off on 2 3 4 5 6 7 9 1 10 8 configuration sensor setting: thermistor, 100 µ a reference current loop direction: ntc, for thermistors pid constants: p = 32, i = 1 second, d = off...
Page 7: Table of Contents
7 table of contents default configuration from the factory ___________ 6 safety summary ______________________________ 8 front panel at a glance _______________________ 10 rear panel at a glance _______________________ 12 preparing the temperature controller for use_____ 15 operating guidelines ____...
Page 8: Safety Summary
8 safety summary do not install substitute parts or perform any unauthorized modification to the product. Return the product to wavelength electronics for service and repair to ensure that safety features are maintained. Do not use this product beyond its specifications. Symbol definition of symbol ...
Page 9: Note!
9 note! Complete all operational steps in the order provided. Skipping a step can result in damage to the device being controlled or the thermoelectric module. Start with the section appropriate to the type of sensor you are using warning for continued protection against fire, replace line fuse only...
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11 temp limit led: this led lights red whenever the load temperature exceeds the limit temperature set by the temp limit trimpot. The output current is switched off when this error occurs. Temp limit trimpot: this adjusts the temp limit setpoint. Sensor error led: this led lights red whenever the se...
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Configuration switch bank: this ten position switch bank configures the type of sensor used, the feedback p, i, and d terms, and sets the temperature limit to a high or low limit. Switches 1, 2, & 3: (10 µ a, 100 µ a, and 1000 µ a) determines reference current through the sensor. If more than one sw...
Page 14: Analog Interface Connector:
14 analog interface connector: bnc & 15 pin d-sub plug pins 1 & 2: (mod+, mod-) external analog input. The bnc input is in parallel, but isolated by two 1k Ω resistors. Either of the inputs can be used, but not simultaneously. Pins 3 & 4: (boost+, boost-) booster output. Pins 5 & 6: (err+, err-) con...
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15 preparing the temperature controller for use check the list of supplied items: o one power cord o one 9 pin d-sub receptacle (solder cup), hood, and connecting hardware o one 15 pin d-sub receptacle (solder cup), hood, and connecting hardware o one ac fuse installed o one ac fuse is shipped separ...
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19 step 4: select the pid constants the most common pid settings for the ad590 are: p - gain = 64 i - integral time constant = 10 seconds d - differential time constant = none for more detailed pid setup, see page 28. Step 5: set the high or low temperature limit see page 26 for this operation detai...
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21 step 5: set the high or low temperature limit see page 26 for this operation detail. Step 6: adjust the limit current see page 25 for this operation detail. Step 7: adjust the temperature setpoint rotate the display select switch to the linear. The value displayed will be the ambient temperature ...
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23 step 5: set the high or low temperature limit see page 26 for this operation detail. Step 6: adjust the limit current see page 25 for this operation detail. Step 7: adjust the temperature setpoint rotate the display select switch to either the 10 µ a or 100 µ a position. The value displayed will ...
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Page 28: Configure The Pid Constants
28 configure the pid constants error amplifier: the error amplifier section provides the difference between the setpoint temperature and the actual temperature of the load device as sensed by the temperature sensor. This difference is known as the error term. This error term is fed to the pid proces...
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30 practical pid setups: definitions: small thermal load: q c medium thermal load: 5 w c large thermal load: q c > 20 watts q c is the heat pumped from the te’s cold surface. Typical settings for thermistors small thermal load off on 2 3 4 5 6 7 9 1 10 8 p = 16, i = 1 sec, d = none medium thermal lo...
Page 31: Error and Status Indicators
31 error and status indicators several led indicators and a beeper are used to determine the status of the controller. Status section power led: this led lights green whenever the ac power switch on the front panel is depressed and ac power is supplied to the unit. Temp limit led: this led lights re...
Page 32: Analog Interface
32 analog interface pins 1 & 2: (mod+, mod-) an external analog signal can be directly connected to these pins (or the analog bnc input) to remotely control temperature setpoint. This input is configured to accept ± 10 v signals while withstanding inputs as large as ± 40v. Any input on these pins is...
Page 33: Note!
33 pins 8 & 9: (on/off detect, common) this pin is an open drain connection that remains in a high impedance state when the output is disabled. When the output is enabled, this output is forced into a low impedance state with respect to the common connection (pin 9). Pins 9 & 10: (common, remote on/...
Page 34: Power Supply:
34 lfi 3500 general specifications power supply: 115 or 230 vac ± 15% 50 or 60 hz (switch selectable on rear panel) maximum ac input: 250vac power consumption: 160va peak size (w x d x h) 106 mm x 300 mm x 163 mm (4.25" x 12" x 6.5") weight 4.5 kg (10 lb.) operating temperature: 0 to ≤ 40 ° c storag...
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35 lfi-3500 electrical specifications model number lfi-3525 lfi-3526 lfi-3550 lfi-3551 tec output output control loop type bipolar, pid bipolar, pid bipolar, pid bipolar, pid maximum output current ±± 2.5 a ±± 2.5 a ±± 5.0 a ±± 5.0 a compliance voltage ±± 6v ±± 9 v ±± 5 v ±± 8v maximum output power ...
Page 36: Mechanical Specifications
36 mechanical specifications.
Page 38: Warranty
38 warranty if you have any questions or comments, please call our technical staff at (406) 587-4910. Our hours are 8:00 a.M. To 5:00 p.M. Mt. Wavelength warrants the lfi 3500 series temperature controllers for one year against defects in materials and workmanship when used within published specific...