Watlow CLS200 - Manual (Page 82)

Chapter 3: Using the CLS200 CLS200 Series User’s Guide
66 Watlow Anafaze Doc.# 0600-3050-2000
Thermocouple Short Alarm
The thermocouple short alarm occurs if the process power
is on and the temperature does not rise or fall as expected.
To enable the thermocouple short alarm, you must do the
following:
• Choose a digital input for the PROCESS POWER DIGIN
parameter in the SETUP GLOBAL PARAMETERS menu.
• Connect the digital input to a device that connects the
input to controller common when the process power is
on.
RTD Open or RTD Shorted Alarm
The RTD open alarm occurs if the controller detects that the
positive or negative RTD lead is broken or disconnected.
The RTD shorted alarm occurs if the controller detects that
the positive and negative RTD leads are shorted.
You do not have to set any parameters for the RTD alarms.
Restore Automatic Control After a Sensor Failure
This feature returns a loop to automatic control after a
failed sensor is repaired. To enable this feature:
• Choose a digital input for the RESTORE PID DIGIN
parameter in the SETUP LOOP CONTROL PARAMS
menu.
• Connect the digital input to the dc common terminal
on the controller.
Process Alarms
The CLS200 has four process alarms, each of which you can
configure separately for each loop:
• Low process alarm
• High process alarm
• Low deviation alarm
• High deviation alarm
Setting Up Alarms
To set up an alarm:
• Set the alarm setpoint (limit)
• Set the alarm type
• Choose an output, if desired
• Set the alarm deadband
• Set an alarm delay, if desired
The setpoints, deviation alarm values, and deadband all
use the same decimal format as the loop’s process variable.