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57
4-6
HB Alarm and HS Alarm Errors
HB Alarm and HS Alarm Errors: Heater Burnout Detection or SSR Failure Detection
Function Not Possible
Probable cause
Remedy
Connections
Current Transformer is not connected.
Connect a Current Transformer to the E5ZE.
Current Transformer is wired to an incorrect
control point of the E5ZE.
Wire the Current Transformer to the correct
control point.
Heaters are controlled directly with an alarm
output.
Change the wiring so that the CT input is
connected to the correct control output.
Settings
E5ZE has not started control operation.
Start the control operation.
Control output of a control point is ON for less
than 100 ms.
The HB alarm will operate if the control output of
any control point of the E5ZE is turned ON for
100 ms or more.
Control output of a control point is OFF for less
than 100 ms.
The HS alarm will operate if the control output of
any control point of the E5ZE is turned OFF for
100 ms or more.
HB alarm and HS alarm are disabled (set to 0).
Enable the HB alarm and HS alarm by setting to
1.
HB alarm and HS alarm are enabled before the
heaters are turned ON.
Turn ON the heaters before enabling the HB
alarm and HS alarm.
Heaters are turned ON after the E5ZE starts
control operation.
Turn ON the heaters before starting the E5ZE
control operation.
Heater burnout detection current value of the
E5ZE 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
E5ZE 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
heaters 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
measurement of the current.
Operation
Total current consumption of the heaters
connected to the E5ZE exceeds 50.0 A.
Set the heater current to 50.0 A maximum.
Heaters connected are supplied with DC, or the
E5ZE is a current output type model.
The HB alarm and HS alarm do not operate under
these conditions.
Pure metal heaters are being used.
Determine the heater burnout detection current
value from the actual current consumption of the
heaters.
HB Alarm and HS Alarm Errors
Section 4-6