Watlow CAS200 - Manual (Page 82)

Chapter 5: Troubleshooting and Reconfiguring CAS200 User’s Guide
70 Watlow Anafaze
Other Behaviors
The following table indicates potential problems with the
system or scanner and recommends corrective actions.
Table 5.2 Other Symptoms
Symptom Possible Causes Recommended Action
Indicated tempera-
ture not as expected
Scanner not communicating
Sensor wiring incorrect
Noise
See Checking Analog Inputs on page 73.
CAS200 display is
not lit
Power connection incorrect
Check wiring and service. See Wiring the
Power Supply on page 19.
No EPROM or bad EPROM
Replace the EPROM. See Replacing the
EPROM on page 79.
CAS200 damaged or failed
Return the CAS200 for repair. See Return-
ing Your Unit on page 68.
CAS200 display is
lit, but keys do not
work
Keypad is locked See Keys Do Not Respond on page 73.
CAS200 damaged or failed
Return the CAS200 for repair. See Return-
ing Your Unit on page 68.
Alarm limits or other
settings change
Digital job select feature is
enabled and has changed
jobs
Set JOB SELECT DIG INPUTS TO NONE.
This parameter is only accessible using the
scanner’s keypad and display. See Job
Select Inputs on page 45.
Acknowledged
alarms reoccur or
alarms fail to be indi-
cated
Power is intermittent
Check wiring and service. See Wiring the
Power Supply on page 19.
Use a separate dc supply for the scanner.
Provide backup power (UPS).
Analog reference voltage is
overloaded Disconnect any wiring from the +5V Ref
connection on TB1.
Hardware failure
Check the scanner front panel for a hard-
ware alarm. See System Alarms on page
69.
Scanner does not
behave as expected Corrupt or incorrect values in
RAM Perform a NO -key reset. See NO-Key
Reset on page 78.