Watlow ez-zone pm - Chapter 11: Appendix; Troubleshooting Alarms, Errors and Control Issues

Watlow EZ-ZONE
®
PM Integrated Controller • 118 • Chapter 11 Appendix
Troubleshooting Alarms, Errors and Control Issues
Indication Description Possible Cause(s) Corrective Action
Alarm won’t clear or
reset
Alarm will not clear or reset
with keypad or digital input
•Alarm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in-
stance
•Correctcauseofsensorinputoutof
alarm range
•Setalarmsetpointtocorrecttrip
point
•Setalarmtocorrecttype:process,de-
viation or power
•Setdigitalinputfunctionandsource
instance
Alarm won’t occur Alarm will not activate output •Alarmsilencingisactive
•Alarm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alarmsilencing,ifrequired
•Disablealarmblocking,ifrequired
•Setoutputtocorrectalarmsource
instance
•Setalarmsourcetocorrectinputin-
stance
•Setalarmsetpointtocorrecttrip
point
•Setalarmtocorrecttype:process,de-
viation or power
[AL;E1] Alarm Error
[AL;E2]
[AL;E3]
[AL;E4]
Alarm state cannot be deter-
mined 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
[AL;L1] Alarm Low
[AL;L2]
[AL;L3]
[AL;L4]
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
[AL;h1} Alarm High
[AL;h2]
[AL;h3]
[AL;h4]
Sensor input 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
[Er;i1] Error Input
[Er;i2]
Sensor does not provide a
valid signal to controller
•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
Limit won’t clear or
reset
Limit will not clear or reset
with keypad or digital input
•Sensorinputisoutoflimitsetpoint
range
•Limitsetpointisincorrect
•Digitalinputfunctionisincorrect
•Correctcauseofsensorinputoutof
limit range
•Setlimitsetpointtocorrecttrippoint
•Setdigitalinputfunctionandsource
instance
[Li;E1] Limit Error
Limit state cannot be deter-
mined due to lack of sensor
input, limit will trip
•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
[Li;L1] Limit Low
Sensor input below low limit
set point
•Temperatureislessthanlimitset
point
•Limitoutputslatchandrequirereset
•Incorrectalarmsetpoint
•Checkcauseofundertemperature
•Clearlimit
•Establishcorrectlimitsetpoint
Chapter 11: Appendix