Watlow EZ-ZONE RM-Scanner-Modul - Manual (Page 129)

Watlow EZ-ZONE ® RMS Module • 126 • Appendix
Troubleshooting Alarms, Errors and Module 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
Alarm Error
[AL;E1]
[AL;E2]
[AL;E3] [AL;E4]
[AL;E5] [AL;E6]
[AL;E7] [AL;E8]
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
Alarm Low
[AL;L1]
[AL;L2]
[AL;L3] [AL;L4]
[AL;L5] [AL;L6]
[AL;L7] [AL;L8]
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
Alarm High
[AL;h1}
[AL;h2]
[AL;h3] [AL;h4]
[AL;h5} [AL;h6]
[AL;h7] [AL;h8]
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
No Display No display indication or LED
illumination
• Power to controller is off
• Fuse open
• Breaker tripped
• Safety interlock switch open
• Separate system limit control acti-
vated
• Wiring error
• Incorrect voltage to controller
• Turn on power
• Replace fuse
• Reset breaker
• Close interlock switch
• Reset limit
• Correct wiring issue
• Apply correct voltage, check part
number
No Serial Communi-
cation
Cannot establish serial com-
munications with the con-
troller
• Address parameter incorrect
• Incorrect protocol selected
• Baud rate incorrect
• Parity incorrect
• Wiring error
• EIA-485 converter issue
• Incorrect computer or PLC communi-
cations port
• Incorrect software setup
• Wires routed with power cables
• Termination resistor may be required
• Set unique addresses on network
• Match protocol between devices
• Match baud rate between devices
• Match parity between devices
• Correct wiring issue
• Check settings or replace converter
• Set correct communication port
• Correct software setup to match con-
troller
• Route communications wires away
from power wires
• Place 120 Ω resistor across EIA-485
on last controller