Owner manual

108 CLS User’s Guide
Troubleshooting
NOTE
A No key reset clears the CLS memory and resets its
parameters to their default values. If you have a stand-
alone system, there is no way to recover your original
parameters. If you have a computer-supervised system
with ANASOFT, ANASOFT can store a copy of your
parameters to a job file.
WARNING
Do not attempt to repair the controller yourself. If the trou-
bleshooting procedures in this chapter do not solve your
system's problems, call the Technical Services department
for additional troubleshooting help. If you need to return
the unit to Watlow Anafaze for testing and repair, Techni-
cal Services will issue you an RMA number- see Returning
the Unit below.
Returning your Unit
If you need to return the CLS, please contact Watlow by phone,
fax or e-mail (see contact information on cover) for a Returned
Materials Authorization (RMA) number. The RMA number helps us
track your equipment and return it to you as soon as possible.
Troubleshooting Stand-Alone Systems
The CLS is only part of a control system; be sure to check other parts of
the system, like thermocouples, before you assume that the unit is
broken. To check inputs and outputs, follow these procedures.
Checking an Analog Input
To check any input except the pulse input, follow these steps:
1. Disconnect the sensor wiring.
2. Set the input sensor to type J T/C from the Setup menus.
3. Place a short across the input.
The process variable should indicate ambient temperature. If it does not,
call Watlow Anafaze for an RMA number and return the unit for repair.
To check thermocouple inputs, remove the thermocouple leads and use
an ohm meter to measure between the In+ and In- terminals of TB1.
Thermocouple inputs should not read above 200 ohms.
To check RTD inputs, measure between the In+ and In- terminals of
TB1. RTD inputs should read between 20 and 250 ohms.