Hb Alarm Errors - Omron E5ZN Operation Manual

HB Alarm Errors

8-6 HB Alarm Errors
HB Alarm Errors: Heater Burnout Detection Function Not Possible
Connections Current Transformer is not connected.
Current Transformer is wired to an incorrect chan-
nel of the E5ZN.
Heaters are controlled directly with an alarm out-
put.
Settings E5ZN has not started control operation.
Control output is ON for less than 190 ms.
HB alarm is not set in output allocations.
Heaters are turned ON after the E5ZN starts con-
trol operation.
Heater burnout detection current value of the
E5ZN is set to 0.0 or 50.0 A.
Heater burnout detection current value of the
E5ZN is set to the rated current.
Heater burnout detection current value obtained
from the actual current consumption of the heat-
ers is incorrect.
Operation Total current consumption of the heaters con-
nected to the E5ZN exceeds 50.0 A.
Heaters connected are supplied with DC.
Pure metal heaters are being used.
Probable cause Remedy
Connect a Current Transformer to the E5ZN.
Wire the Current Transformer to the correct chan-
nel.
Change the wiring so that the CT input is con-
nected to the correct control output.
Start the control operation.
The HB alarm will operate if the control output is
turned ON for 190 ms or more.
Set "Alarm 1 and HAB OR output" in output
assignments.
Turn ON the heaters before starting the E5ZN
control operation.
Set the heater burnout detection current value to
an appropriate value between 0.1 and 49.9 A.
Determine the heater burnout detection current
value from the actual current consumption of the
heaters.
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.
Set the heater current to 50.0 A maximum.
The HB alarm do not operate under this condition.
Determine the heater burnout detection current
value from the actual current consumption of the
heaters.
Section 8-6
177