Omron Sysmac CJ Series, Руководство по эксплуатации

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Troubleshooting Section 5-2
5-2-2 Troubleshooting from Symptoms: Temperature Control Errors
Temperature Does Not Rise
Measured Temperature Higher than Control Temperature
Step Possible Cause Remedy
Connection The measured temperature is incorrect. Refer to 5-2-1 Troubleshooting from Symptoms: Mea-
surement Errors for troubleshooting directions.
There is no load connected to the control output
terminals. Connect a load.
The load’s polarity is reversed or the load is wired
to the wrong terminals. Wire the load correctly.
The terminal screws are loose so there is poor
contact between the wires and terminals. Tighten the terminal screws.
The heater’s power supply is not ON. Turn ON the heater’s power supply.
The heater circuit is burned out or damaged. Replace the heater with a good one.
The heater’s heat output is insufficient. • Replace the heater with one that has a higher output.
• When using two or more heaters, check whether one
is burned out. Replace if necessary.
An overheating protection device is operating. Increase the overheating protection device’s tempera-
ture setting so it is higher than the Temperature Control-
ler Unit’s set point.
Settings The forward operation/reverse operation setting is
incorrect Correct the setting.
The PID constant settings are not correct. • Perform autotuning.
• Make the correct PID constant settings manually.
Temperature control has not been started. Start temperature control.
A cooling fan is operating. Turn OFF the cooling fan.
Step Possible Cause Remedy
Connection The measured temperature is incorrect. Refer to 5-2-1 Troubleshooting from Symptoms: Mea-
surement Errors for troubleshooting directions.
The load is connected to the wrong control loop,
so the heater is being controlled by another loop’s
control output. Wire the load correctly.
The contacts are fused in the relay operated by
the control output. Replace the relay with a good one.
There is a short circuit in the relay operated by the
control output. Replace the relay with a good one.
Current is flowing to the heater because of leak-
age current through the relay operated by the con-
trol output. Connect a bleeder resistor to prevent operation due to
the leakage current.
Settings The forward operation/reverse operation setting is
incorrect. Correct the setting.
The PID constant settings are not correct. • Perform autotuning.
• When autotuning is completed, refresh the PID con-
stants properly so that the Unit operates with the cal-
culated PID constants.
• Make the correct PID constant settings manually.
Usage There is excessive overshooting. Refer to Excessive Overshooting or Undershooting on
page 80 for troubleshooting directions.