Watlow CPC400 - Manual (Page 160)

Chapter 6: Troubleshooting and Reconfiguring CPC400 Series User’s Guide
146 Watlow Anafaze Doc. 0600-2900-2000
Ambient Warning
The ambient warning alarm indicates that the ambient
temperature of the controller is too hot or cold. Ambient
warning occurs when the controller's temperature is in the
range of 23 to 32°F or 122 to 131°F. The operating limits
are 32 to 122°F.
If the controller displays AW in the lower left corner of the
display:
1. Acknowledge the alarm.
2. If the error message remains, check the ambient air
temperature near the controller. Adjust ventilation,
cooling or heating to ensure that the temperature
around the controller is 32 to 122°F. If the unit is func-
tioning correctly, the error will clear automatically
when the ambient temperature is within range and
the alarm has been acknowledged.
3. If error persists, make a record of the settings, then
clear the RAM. See Clearing the RAM on page 153.
4. If the error is not cleared, contact your supplier for fu-
ther troubleshooting guidelines. See Returning a Unit
on page 140.
H/W Failure: Gain or Offset
If the controller displays H/W failure: Gain or H/W fail-
ure: Offset:
1. Acknowledge the alarm
2. If the error message remains, switch the power to the
controller off, then on again.
3. If the alarm persists, make a record of all controller
settings, then clear the RAM. See Clearing the RAM
on page 153.
4. If the alarm is not cleared, contact your supplier for
further troubleshooting guidelines. See Returning a
Unit on page 140.
NOTE! If the controller has failed, it may have been dam-
aged by excessive voltage. Before replacing the
controller, troubleshoot for high ac voltage on
sensors or outputs. See Checking Analog Inputs
on page 148.
H/W Failure: Ambient
The H/W failure: Ambient alarm indicates that the ambi-
ent sensor in the CPC400 is reporting that the temperature
around the controller is outside of the acceptable range of 0