Watlow CPC400 - Manual (Page 157)

CPC400 Series User’s Guide Chapter 6: Troubleshooting and Reconfiguring
Doc. 0600-2900-2000 Watlow Anafaze 143
System Alarms
If the controller detects a hardware problem, it displays an
alarm message. The message persists until the condition is
corrected.
The CPC400 displays the following system alarm messages:
• Low power: See Low Power on page 145.
• Battery dead: See Battery Dead on page 145.
• H/W failure: Ambient: See H/W Failure: Ambient on
page 146.
• H/W failure: Gain: See H/W Failure: Gain or Offset
on page 146.
• H/W failure: Offset: See H/W Failure: Gain or Offset
on page 146.
Other Behaviors
Table 6.2 indicates potential problems with the system or
controller and recommends corrective actions.
Table 6.2 Other Symptoms
Symptom Possible Causes Recommended Action
Indicated tempera-
ture not as expected
Controller not communicating
Sensor wiring incorrect
Noise
See Checking Analog Inputs on page 148.
CPC400 display is
not lit
Power connection incorrect
Check wiring and service. See Wiring the
Power Supply on page 24.
Failed flash memory chip
Replace the flash memory chip. See
Replacing the Flash Memory Chip on page
154.
CPC400 damaged or failed
Return the CPC400 for repair. See Return-
ing a Unit on page 140.
CPC400 display is
lit, but keys do not
work
Keypad locked See Keys Do Not Work on page 147.
Unacknowledged alarm
An alarm condition exists and has not been
acknowledged. See
How to Acknowledge
an Alarm on page 52.
CPC400 damaged or failed
Return the CPC400 for repair. See Return-
ing a Unit on page 140.