Troubleshooting - Omron CQM1 Operation Manual

Troubleshooting

2-8 Troubleshooting
Error
Watchdog timer error
RAM read/write error
EEPROM error
Parameter change dur-
ing autotuning
Setting range error
Sensor error
CT input error
Timeout error (for
IOTC(––) instruction)
"EEEE" set in input OFF for all outputs.
word.
"E100" set in input
word.
"E120" set in input
word.
"EE00" set in input Normal operation will
word. continue.
"EE01" set in input
word.
"E400" set in input word Auto Mode: OFF for
when process value is control loop with error.
monitored for a loop.
Manual Mode: Opera-
tion will continue with
manual output level.
"E500" set in input word The heater burnout
when heater current is alarm output will main-
monitored for a loop. tain the same status as
before the CT input
error.
"E900" is output to the Normal operation will
destination word (D) for continue.
the IOTC(––) instruc-
tion.
Error Priority
The error code with the highest priority will be set then more than one error
occurs at the same time. The errors are given in order of priority in the above
table.
Control output
Turn the power supply OFF and then back
ON. If the error persists, replace the Unit.
Set parameter after autotuning has been
completed.
Reset the setting to within the proper range.
Check the connections to the input sensor
and cold junction compensator.
Check the sensor for broken or shorted wir-
ing.
Check the sensor connections to be sure
they have not been reversed.
Be sure the correct sensor and compensat-
ing lead are connected.
Be sure the input temperature range has
not been exceeded.
Check the cold junction compensator to be
sure it is connected properly.
Be sure the sensor and input type settings
agree.
Be sure the input type DIP switch and the
function DIP switch settings are correct.
The current is 55 A or higher. Reduce the
heater current to below 55 A.
The set value for the I/O allocation com-
mand will not have been written. Repeat the
setting.
Section 2-8
Remedy
269