Omron E5ZN - HB Alarm Errors

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HB Alarm Errors Section 8-6
8-6 HB Alarm Errors
HB Alarm Errors: Heater Burnout Detection Function Not Possible
Probable cause Remedy
Connections Current Transformer is not connected. Connect a Current Transformer to the E5ZN.
Current Transformer is wired to an incorrect chan-
nel of the E5ZN.
Wire the Current Transformer to the correct chan-
nel.
Heaters are controlled directly with an alarm out-
put.
Change the wiring so that the CT input is con-
nected to the correct control output.
Settings E5ZN has not started control operation. Start the control operation.
Control output is ON for less than 190 ms. The HB alarm will operate if the control output is
turned ON for 190 ms or more.
HB alarm is not set in output allocations. Set “Alarm 1 and HAB OR output” in output
assignments.
Heaters are turned ON after the E5ZN starts con-
trol operation.
Turn ON the heaters before starting the E5ZN
control operation.
Heater burnout detection current value of the
E5ZN is set to 0.0 or 50.0 A.
Set the heater burnout detection current value to
an appropriate value between 0.1 and 49.9 A.
Heater burnout detection current value of the
E5ZN is set to the rated current.
Determine the heater burnout detection current
value from the actual current consumption of the
heaters.
Heater burnout detection current value obtained
from the actual current consumption of the heat-
ers is incorrect.
Reset the heater burnout detection current value
by considering the voltage range of the power
supply for the heaters and any error in measure-
ment of the current.
Operation Total current consumption of the heaters con-
nected to the E5ZN exceeds 50.0 A.
Set the heater current to 50.0 A maximum.
Heaters connected are supplied with DC. The HB alarm do not operate under this condition.
Pure metal heaters are being used. Determine the heater burnout detection current
value from the actual current consumption of the
heaters.