Troubleshooting Alarms, Errors And Control Issues; Chapter 11: Appendix - Watlow EZ-ZONE PM User Manual

Chapter 11: Appendix

Troubleshooting Alarms, Errors and Control Issues

Indication
Alarm won't clear or Alarm will not clear or reset
reset with keypad or digital input
Alarm won't occur Alarm will not activate output • Alarm silencing is active
[AL; E 1] Alarm Error Alarm state cannot be deter-
mined due to lack of sensor
[AL; E 2]
input
[AL; E 3]
[AL; E 4]
[AL; L 1] Alarm Low Sensor input below low alarm
set point
[AL; L 2]
[AL; L 3]
[AL; L 4]
[AL; h 1} Alarm High Sensor input above high
alarm set point
[AL; h 2]
[AL; h 3]
[AL; h 4]
[Er; i 1] Error Input Sensor does not provide a
valid signal to controller
[Er; i 2]
Limit won't clear or Limit will not clear or reset
reset with keypad or digital input
[Li; E 1] Limit Error Limit state cannot be deter-
mined due to lack of sensor
input, limit will trip
[Li; L 1] Limit Low Sensor input below low limit
set point
®
Watlow E Z-ZONE PM I nt e gr a te d Con t r ol le r
Description
• 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
• 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
• Sensor improperly wired or open
• Incorrect setting of sensor type
• Calibration corrupt
• 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
• 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
• Sensor improperly wired or open
• Incorrect setting of sensor type
• Calibration corrupt
• Sensor input is out of limit set point
range
• Limit set point is incorrect
• Digital input function is incorrect
• Sensor improperly wired or open
• Incorrect setting of sensor type
• Calibration corrupt
• Temperature is less than limit set
point
• Limit outputs latch and require reset
• Incorrect alarm set point
Possible Cause(s)
118
• •
Corrective Action
• 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
• 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
• Correct wiring or replace sensor
• Match setting to sensor used
• Check calibration of controller
• Check cause of under temperature
• Clear latched alarm
• Establish correct alarm set point
• Set alarm source to proper setting
• Check cause of over temperature
• Clear latched alarm
• Establish correct alarm set point
• Set alarm source to proper setting
• Correct wiring or replace sensor
• Match setting to sensor used
• Check calibration of controller
• Correct cause of sensor input out of
limit range
• Set limit set point to correct trip point
• Set digital input function and source
instance
• Correct wiring or replace sensor
• Match setting to sensor used
• Check calibration of controller
• Check cause of under temperature
• Clear limit
• Establish correct limit set point
Ap pe nd i x
Ch ap te r 1 1