Omron E5AR - MANUAL 2 User Manual

10.4 Inferring causes from conditions (abnormal control)
10-5
Troubleshooting
10.4 Inferring causes from conditions (abnormal control)
● The PV does not rise
● The measured value rises above the SP
Possible cause Solution
Connections
Abnormal measured value. Solve as explained in section 10.3.
A load is not connected to the control output
terminal.
Connect a load.
Incorrect load polarity or incorrect terminal
connections.
Wire correctly.
The terminal connection screws are loose, resulting
in a bad connection.
Tighten the screws securely.
The heater power is not turned on. Turn on the heater power.
The heater has a broken wire or has deteriorated. Replace the heater.
The heater has a low heat capacity. • Change to a heater with a high heat capacity.
• If using two or more heaters, replace any
heaters that have broken wires.
The overheating prevention device has activated. Increase the temperature setting of the
overheating prevention device to a value higher
than the SP of the E5AR/ER.
Settings
Direct action and reverse action settings are
incorrect.
Set the correct settings.
The PID values are not suitable. • Run AT.
• Set suitable PID values.
Control has not been started. Start control.
The output does not increase due to MV limits. Change the output limits to suitable values.
The cooling fan is running. Stop the cooling fan.
Possible cause Solution
Connections
Abnormal measured value. See section 10.3.
The load is connected to the wrong channel and
the heater is being controlled by the control output
of another channel.
Wire correctly.
The contact of the control output drive relay has
melted.
Replace the relay.
Short-circuit failure in SSR. Replace the SSR.
Current flows to heater due to SSR leakage
current.
Connect a bleeder resistor to prevent action due
to leakage current.
Settings
Direct action and reverse action settings are
incorrect.
Set the correct settings.
The PID values are not suitable. • Run AT.
• Set suitable PID values.
The output does not decrease due to MV limits. Change the output limits to suitable values.
Output is taking place in manual mode. Stop manual mode.
Method of use
The object of control generates heat. Use heating/cooling control.
Large overshoot. See the "Overshoot or undershoot"
troubleshooting table.

Omron E5AR - MANUAL 2 Specifications

General

Brand	Omron
Model	E5AR - MANUAL 2
Category	Controller
Language	English