User guide

Watlow EZ-ZONE
®
PM PID Controller • 108 • Appendix
Chapter 10: Appendix
Troubleshooting Alarms, Errors and Control Issues
Indication Description Possible Causes 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incor-
rect
•Resetalarmwhenprocessis
within range or disable latching
•Setoutputtocorrectalarm
source instance
•Setalarmsourcetocorrectin-
put instance
•Correctcauseofsensorinput
out of alarm range
•Setalarmsetpointtocorrect
trip point
•Setalarmtocorrecttype:pro-
cess, deviation 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out-
put
•Alarmissettoincorrect
source
•Alarmsetpointisincorrect
•Alarmissettoincorrecttype
•Disablealarmsilencing,ifre-
quired
•Disablealarmblocking,ifre-
quired
•Setoutputtocorrectalarm
source instance
•Setalarmsourcetocorrectin-
put instance
•Setalarmsetpointtocorrect
trip point
•Setalarmtocorrecttype:pro-
cess, deviation 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tempera-
ture
•Clearlatchedalarm
•Establishcorrectalarmset
point
•Setalarmsourcetoproperset-
ting
[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tempera-
ture
•Clearlatchedalarm
•Establishcorrectalarmset
point
•Setalarmsourcetoproperset-
ting
[Er;i1] Error Input
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