53
4-4
Temperature Control Errors
Temperature Does Not Rise
Probable cause
Remedy
Connections
Process value of the E5ZE is abnormal.
Refer to 4-3 Temperature Sensing Errors for
appropriate troubleshooting.
Load is not connected to the control output
terminal of the E5ZE.
Connect a load.
Polarity or wiring of a load is incorrect.
Correct the wiring of the load.
A screw of the terminal block of the E5ZE is
loosened and improper contact is resulting.
Tighten the screw.
Power is not supplied to heaters.
Supply power to the heaters.
Heaters are burnt out or have deteriorated.
Replace the heaters.
Heat capacity of the heater is too small.
•
Replace the heater with one having a larger
heat capacity.
•
If more than one heater is used and some are
burnt out, replace the heaters.
Overheating prevention device for the E5ZE is
operating.
The set value of the overheating prevention
device must be larger than the set value of the
E5ZE.
Settings
E5ZE is in reverse operation mode, instead of
direct operation mode, or vice versa.
Correct the operation mode setting.
PID constants of the E5ZE are incorrect.
•
Execute auto-tuning.
•
Set the PID constants of the E5ZE to
appropriate values.
E5ZE has not started temperature control.
Start the temperature control.
Control output value of the E5ZE does not
increase because of the restrictions of the set
output limit value.
•
Set the output limit value of the E5ZE to an
appropriate value.
Control output value of the E5ZE does not
increase because of the restrictions of the set
output change rate limit.
•
Disable the output change rate limit function of
the E5ZE by setting to 0000.
•
Set the output change rate limit of the E5ZE to
an appropriate value.
Cooling fan is operating.
Turn OFF the cooling fan.
Temperature Control Errors
Section 4-4
