Watlow PM PLUS 6 - Chapter 10: Appendix; Troubleshooting Alarms, Errors and Control Issues

Watlow PM PLUS™ 6 • 112 • Chapter 10 Appendix
Chapter 10: Appendix
Troubleshooting Alarms, Errors and Control Issues
Indication Issue Issue / Possible Cause(s) Corrective Action
Alarm won’t clear
or reset
Alarm will not clear or re-
set with keypad or digital
input
• Alarm will not clear or reset via
device or digital input.
• Latching is active
• Alarm set to incorrect output
• Alarm is set to incorrect source
• Sensor input is out of alarm set
point range
• Alarm set point is incorrect
• Alarm is set to incorrect type
• Digital input function is incorrect
• Reset alarm when process is
within range or disable latching
• Set output to correct alarm source
instance
• Set alarm source to correct input
instance
• Correct cause of sensor input out
of alarm range
• Set alarm set point to correct trip
point
• Set alarm to correct type: process,
deviation or power
• Set digital input function and
source instance
Alarm won’t occur Alarm will not activate
output
• Silencing is active
• Blocking is active
• Alarm is set to incorrect output
• Alarm is set to incorrect source
• Alarm set point is incorrect
• Alarm is set to incorrect type
• Disable silencing, if required
• Disable blocking, if required
• Set output to correct alarm source
instance
• Set alarm source to correct input
instance
• Set alarm set point to correct trip
point
• Set alarm to correct type: process,
deviation or power
Alarm Error 1
Alarm Error 2
Alarm Error 3
Alarm Error 4
Alarm state cannot be
determined due to lack of
sensor input
• Sensor improperly wired or open
• Incorrect setting of sensor type
• Calibration corrupt
• Correct wiring or replace sensor
• Match setting to sensor used
• Check calibration of controller
Alarm Low
[1,2,3,4]
Sensor input below low
alarm set point
• Temperature is less than alarm set
point
• Alarm is set to latching and an
alarm occurred in the past
• Incorrect alarm set point
• Incorrect alarm source
• Check cause of under temperature
• Clear latched alarm
• Establish correct alarm set point
• Set alarm source to proper setting
Alarm High
[1,2,3,4]
Sensor input value is
above high alarm set
point
• Temperature is greater than alarm
set point
• Alarm is set to latching and an
alarm occurred in the past
• Incorrect alarm set point
• Incorrect alarm source
• Check cause of over temperature
• Clear latched alarm
• Establish correct alarm set point
• Set alarm source to proper setting
Error Input [1,2] Sensor does not provide
a valid signal to controller
• There is no valid signal to the de-
vice. The sensor may be improp-
erly wired or open.
• Incorrect setting of sensor type
• Calibration corrupt
• Correct wiring or replace sensor
• Match setting to sensor used
• Check calibration of controller