Watlow EZ-ZONE PM Integrated Controller - Manual (Page 157)

Watlow EZ-ZONE ® PM Integrated Controller • 154 • 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
[Li;h1] Limit High Sensor input above high limit
set point
• Temperature is greater than limit set
point
• Limit outputs latch and require reset
• Incorrect alarm set point
• Check cause of over temperature
• Clear limit
• Establish correct limit set point
Chapter 11: Appendix