Omron E5ZD Operation Manual page 137

Troubleshooting Lists
Heater Burnout Detection Doesn't Work Properly
Possible cause
Current Transformer is not connected properly. Correctly wire Current Transformer.
E54-CT2 is being used.
HB and HS alarms have not been made op-
erational.
Setting for heater burnout detection level is
0.0 A.
Setting for heater burnout detection level is
incorrect.
HB and HS alarms were made operational be-
fore heater was turned on.
Control output is not being used.
Operation is not starting.
Control output was ON for less than 200 ms.
Control output was OFF for less than 200 ms.
Heater current exceeds 50 A.
Heater's rated current and actual current differ. Use Heater Current Read to check actual heater current,
Remedy
Only E54-CT1 and E54-CT3 can be used as Current
Transformers.
Use Alarm Point Write (WU) to make alarms operational.
With a setting of 0.0 A the HB alarm is invalid. Make the
proper setting.
Take into account variations in measurement and fluctua-
tions in heater power supply voltage. Allow for a 1 A fluc-
tuation due to ambient temperature influences.
Turn on heater first.
HG and HS alarms are synchronous with control output,
so control output must be used.
Start operation with OS command.
HB alarm detection will not operate unless control output
stays ON for 200 ms.
HB alarm detection will not operate unless control output
stays OFF for 200 ms.
To avoid damage, do not run a current of over 50 A.
and set detection level accordingly.
Section 6-1
Reference
Sec. 3-5
Sec. 1-4-3,
App. A
Sec. 4-2-7
Sec. 4-2-28
Sec. 1-4-3,
3-5-4
Sec. 1-4-3
Sec. 3-5-4
Sec. 3-5
Sec. 3-5
Sec. 3-5
App. A
Sec. 4-2-30
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