Watlow F4T Installation And Troubleshooting User’s Manual page 37

Indication
Alarm Low Sensor input below
low alarm set point
Alarm High Sensor input above
high alarm set point
Error Input Sensor does not
provide a valid sig-
nal to controller
Limit won't Limit will not clear
clear or reset or reset with key-
pad or digital input
Limit Error Limit state cannot
be determined due
to lack of sensor
input, limit will trip
Limit Low Sensor input below
low limit set point
Watl o w F 4T I nst al l & Tr o u bl es h o o tin g
Anderson-Bolds ~ 216-360-9800
Description
• 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 sen-
sor type
• Calibration corrupt
• Sensor input is out of
limit set point range
• Limit set point is incor-
rect
• Digital input function is
incorrect
• Sensor improperly wired
or open
• Incorrect setting of sen-
sor type
• Calibration corrupt
• Temperature is less than
limit set point
• Limit outputs latch and
require reset
• Incorrect alarm set point
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Possible Cause(s)
3 4
• •
Corrective Action
• 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 re-
place 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 func-
tion and source instance
• Correct wiring or re-
place sensor
• Match setting to sensor
used
• Check calibration of
controller
• Check cause of under
temperature
• Clear limit
• Establish correct limit
set point
Chapter 5 Troubl eshooti ng