Watlow CLS200 - Manual (Page 182)

Chapter 9: Troubleshooting and Reconfiguring CLS200 Series User’s Guide
166 Watlow Anafaze Doc.# 0600-3050-2000
Failed Sensor Alarms
When a failed sensor alarm occurs, the controller switches
to the single loop display for the loop with the alarm and
displays an alarm code on the screen. AnaWin or WatView
displays a message on the alarm screen and logs the alarm
in the event log.
Table 9.3 Failed Sensor Alarm Codes
A failed sensor alarm clears once it has been acknowledged
and the sensor is repaired.
System Alarms
If the controller detects a hardware problem, it displays a
message. The message persists until the condition is cor-
rected.
Table 9.4 Hardware Error Messages
Code Alarm Description
FS Failed Sensor Open thermocouple.
RT
Reversed
Thermocouple
Temperature changed in the opposite direction than expected.
ST
Shorted
Thermocouple
Temperature failed to change as expected.
RO RTD Open Positive or negative lead is broken or disconnected.
RS RTD Shorted Positive and negative leads are shorted.
Message Possible Cause Recommended Action
LOW POWER Power supply failed. See Low Power on page 168 .
BATTERY DEAD RAM battery is dead. See Battery Dead on page 168 .
AW
Ambient warning. Ambient tem-
perature exceeds operating lim-
its by less than 5° C (9° F).
See Ambient Warning on page
168
.
H/W AMBIENT FAILURE
Ambient temperature exceeds
operating limits by 5° C (9° F).
Reference voltage (5V
Î [dc])
shorted to common.
Hardware failed due to exces-
sive voltage on inputs.
See H/W Ambient Failure on
page 169
.
H/W GAIN FAILURE
Hardware failed due to exces-
sive voltage on inputs.
See H/W Gain or Offset Failure
on page 170
.
H/W OFFSET FAILURE
Hardware failed due to exces-
sive voltage on inputs.
See
H/W Gain or Offset Failure
on page 170 .