Watlow Electric EZ-ZONE PM Chapter 10: Appendix, Troubleshooting Alarms, Errors and Control Issues

Chapter 10: Appendix

Troubleshooting Alarms, Errors and Control Issues

Indication	Description	Possible Cause(s)	Corrective Action
Alarm won’t clear or	Alarm will not clear or reset	• Alarm latching is active	• Reset alarm when process is within
reset	with keypad or digital input		range or disable latching
		• Alarm set to incorrect output	• Set output to correct alarm source
			instance
		• Alarm is set to incorrect source	• Set alarm source to correct input in-
			stance
		• Sensor input is out of alarm set point	• Correct cause of sensor input out of
		range	alarm range
		• Alarm set point is incorrect	• Set alarm set point to correct trip
			point
		• Alarm is set to incorrect type	• Set alarm to correct type: process, de-
			viation or power
		• Digital input function is incorrect	• Set digital input function and source
			instance
Alarm won’t occur	Alarm will not activate output	• Alarm silencing is active	• Disable alarm silencing, if required
		• Alarm blocking is active	• Disable alarm blocking, if required
		• Alarm is set to incorrect output	• Set output to correct alarm source
			instance
		• Alarm is set to incorrect source	• Set alarm source to correct input in-
			stance
		• Alarm set point is incorrect	• Set alarm set point to correct trip
			point
		• Alarm is set to incorrect type	• Set alarm to correct type: process, de-
			viation or power
[AL;E1] Alarm Error	Alarm state cannot be deter-	• Sensor improperly wired or open	• Correct wiring or replace sensor
[AL;E2]	mined due to lack of sensor	• Incorrect setting of sensor type	• Match setting to sensor used
[AL;E3]	input	• Calibration corrupt	• Check calibration of controller
[AL;E4]
[AL;L1] Alarm Low	Sensor input below low alarm	• Temperature is less than alarm set	• Check cause of under temperature
[AL;L2]	set point	point
[AL;L3]		• Alarm is set to latching and an alarm	• Clear latched alarm
[AL;L4]		occurred in the past
		• Incorrect alarm set point	• Establish correct alarm set point
		• Incorrect alarm source	• Set alarm source to proper setting
[AL;h1} Alarm High	Sensor input above high	• Temperature is greater than alarm	• Check cause of over temperature
[AL;h2]	alarm set point	set point
[AL;h3]		• Alarm is set to latching and an alarm	• Clear latched alarm
[AL;h4]		occurred in the past
		• Incorrect alarm set point	• Establish correct alarm set point
		• Incorrect alarm source	• Set alarm source to proper setting
[Er;i1] Error Input	Sensor does not provide a	• Sensor improperly wired or open	• Correct wiring or replace sensor
[Er;i2]	valid signal to controller	• Incorrect setting of sensor type	• Match setting to sensor used
		• Calibration corrupt	• Check calibration of controller
Limit won’t clear or	Limit will not clear or reset	• Sensor input is out of limit set point	• Correct cause of sensor input out of
reset	with keypad or digital input	range	limit range
		• Limit set point is incorrect	• Set limit set point to correct trip point
		• Digital input function is incorrect	• Set digital input function and source
			instance
[Li;E1] Limit Error	Limit state cannot be deter-	• Sensor improperly wired or open	• Correct wiring or replace sensor
[Li;E2]	mined due to lack of sensor	• Incorrect setting of sensor type	• Match setting to sensor used
	input, limit will trip	• Calibration corrupt	• Check calibration of controller
[Li;L1] Limit Low	Sensor input below low limit	• Temperature is less than limit set	• Check cause of under temperature
[Li;L2]	set point	point
		• Limit outputs latch and require reset	• Clear limit
		• Incorrect alarm set point	• Establish correct limit set point

Watlow EZ-ZONE®PM Integrated Controller • 66 • Appendix