Watlow EZ-ZONE PM PID - Manual (Page 111)

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