Watlow ez-zone pm - Page 230

Watlow EZ-ZONE
®
PMI Controller • 226 • Chapter 11 Appendix
Indication Description Possible Cause(s) Corrective Action
Alarm Low
AL.L1
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 prop-
er setting
Alarm High
AL.h1
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 tem-
perature
• Clear latched alarm
• Establish correct alarm
set point
• Set alarm source to prop-
er setting
Error Input
Er.i1
Er.i2
Sensor does not
provide a valid sig-
nal 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 con-
troller
Ambient Error
Er.ab
Sensor does not
provide a valid sig-
nal to controller
• Ambient error - cold junc-
tion circuitry not working
• Return to factory for re-
pair
Limit won’t
clear or reset
Limit will not clear
or reset with key-
pad or digital input
• Sensor input is out of
limit set point range
• Limit set point is incor-
rect
• Digital input function is
incorrect
• Correct cause of sensor
input out of limit range
• Set limit set point to cor-
rect trip point
• Set digital input function
and source instance
Limit Error
Li.E1
Limit state cannot
be determined due
to lack of sensor in-
put, limit will trip
• Sensor improperly wired
or open
• Incorrect setting of sen-
sor type
• Calibration corrupt
• Correct wiring or replace
sensor
• Match setting to sensor
used
• Check calibration of con-
troller