Walchem WBLW100 Series Instruction Manual - page 24
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Sensor Mode
Select the effect that the probe wash event will have on any control outputs that use the
sensor(s) being washed. The options are to either Disable the sensor readings (turn the
control output off) or Hold the sensor reading at the last valid sensor reading prior to the
start of the probe wash event.
Hold Time
Enter the amount of time needed to hold the sensor reading after the event has finished, in
order for the wash solution to be replaced by process solution.
5.3.15
Analog Output, Retransmit Mode
Output Details
The details for this type of output include the output %, HOA mode or Interlock status, accumulated on-time, alarms,
current cycle on time and relay type
Settings
Press the Settings key view or change the settings related to the analog output.
4 mA Value
Enter the process value to correspond to a 4 mA output signal.
20 mA Value
Enter the process value to correspond to a 20 mA output signal.
Hand Output
Enter the output % desired when the output is in Hand mode.
Input
Select the sensor input to retransmit.
Error Output
Enter the output mA desired when the sensor is not giving the controller a valid signal.
The acceptable range is 0 to 21 mA.
5.3.16
Analog Output, Proportional Control Mode
Output Details
The details for this type of output include the output %, HOA mode or Interlock status, accumulated on-time, alarms,
current cycle on time and relay type.
Settings
Press the Settings key view or change the settings related to the analog output.
Set point
Enter the sensor process value at which the output % will be the programmed minimum %.
Proportional Band
Enter the sensor process value away from the set point at which the output % will be the
programmed maximum %.
Minimum Output
Enter the lowest output %. If the output should be off at the set point, this will be 0%.
Maximum Output
Enter the highest output %.
Hand Output
Enter the output % desired when the output is in Hand mode.
Input
Select the sensor input to use for proportional control.
Direction
Select the control direction.
Off Mode Output
Enter the output mA value desired when the output is in Off mode, or being Interlocked, or
during a calibration of the sensor being used as an input. The acceptable range is 0 to 21 mA.
Error Output
Enter the output mA desired when the sensor is not giving the controller a valid signal.
The acceptable range is 0 to 21 mA.
5.3.17
Analog Output, Flow Proportional Mode
Overview
In Flow Proportional control mode, the controller monitors the rate of flow through an analog or digital flow meter,
and continuously adjusts the analog (4-20 mA) output proportional band to achieve a target PPM level.
The user enters the target PPM and the data necessary to calculate the proportional band (the water flow rate at which
the maximum pulse rate will occur) required to maintain the target PPM with that flow rate of water.
% output = Target PPM
x Water Flow Rate (liter or gal)
Cycles x Pump Capacity (liter or gal/hr) x Pump Setting (%) x Specific Gravity x 166.67
% output = Target PPM
x Water Flow Rate (m3)
Cycles x Pump Capacity (liter/hr) x Pump Setting (%) x Specific Gravity x 0.16667
Control Operation
If the output is continuously on for longer than the Output Time Limit, then output will deactivate.
Output Details
The details for this type of output include the output %, HOA mode or Interlock status, alarms related to this output,
current cycle on time, total accumulated on-time, cycles of concentration, mA output, and the current control mode
setting.
Settings
Touch the Settings icon to view or change the settings related to the relay.
Target
Enter the desired PPM set point for the product.
Pump Capacity
Enter the maximum flow rate for the metering pump.
Pump Setting
Enter the stroke length setting for the metering pump, in percent.
Specific Gravity
Enter the specific gravity of the product to be added.
Hand Output
Enter the output % desired when the output is in Hand mode.
Off Mode Output
Enter the output mA value desired when the output is in Off mode, or being Interlocked, or
during a calibration of the sensor being used as an input. The acceptable range is 0 to 21 mA.
Error Output
Enter the output mA desired when the sensor is not giving the controller a valid signal.
The acceptable range is 0 to 21 mA.
Flow Input
Select the flow meter to be used as an input for this control relay.
5.4 Settings Menu
The configuration Settings Menu is used for settings and activities that are not tied to Inputs or Outputs.
5.4.1
Global Settings
Date
Enter the current year, month and day.
Time
Enter the current hour (military time), minute, and second.
Global Units
Select the units to be used for cable length and wire gauge settings, metric or Imperial.
Temperature Units
Select between Fahrenheit and Celsius.
Alarm Delay
Enter how much time to wait after powering up the controller before alarm conditions are
considered valid.
HVAC Modes
Enable HVAC modes for cooling tower and boiler applications where the relay control
modes for Biocide timer, Bleed and Feed, Bleed then Feed, and Intermittent Sampling are
required. Disable HVAC Modes if these control modes are not necessary and a more generic
timer control mode will replace the Biocide timer.
Language
Select the language the software will use