Inferring Causes From Conditions: Abnormal Control; The Pv Does Not Increase; The Measured Value Increases Above The Sp - Omron E5AR-T User Manual
Programmable digital controller
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Also See for E5AR-T:
- Brochure (6 pages) ,
- Datasheet (29 pages) ,
- Instruction manual (57 pages)
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Section 10 Troubleshooting
10.4 Inferring Causes from Conditions: Abnormal
Control
■ The PV Does Not Increase
Abnormal measured value.
A load is not connected to the control output
terminals.
Incorrect load polarity or incorrect terminal
connections.
The terminal connection screws are loose, resulting
in a bad connection.
The heater power is not turned ON.
The heater has a broken wire or has deteriorated.
The heater has a low heat capacity.
The overheating prevention device has activated.
Direct operation and reverse operation settings are
incorrect.
The PID constants are not suitable.
Control has not been started.
The output does not increased due to MV limits.
The cooling fan is running.
■ The Measured Value Increases Above the SP
Abnormal measured value.
The load is connected to the wrong channel and
the heater is being controlled by the control output
of another channel.
The contact of the control output drive relay has
melted.
Short-circuit failure in SSR.
Current flows to heater due to SSR leakage
current.
10-6
Possible cause
Possible cause
Solution
Troubleshoot as described in 10.3 Inferring
Causes from Conditions: Abnormal Measured
Values (P. 10-4).
Connect a load.
Wire correctly.
Tighten the screws securely.
Turn ON the heater power.
Replace the heater.
• Change to a heater with a high heat capacity.
• If using two or more heaters, replace any
heaters that have broken wires.
Increase the temperature setting of the
overheating prevention device to a value higher
than the SP of the E5AR-T/ER-T.
Set the correct settings.
• Execute AT.
• Set suitable PID constants.
Start control.
Change the MV limits to suitable values.
Stop the cooling fan.
Solution
Troubleshoot as described in 10.3 Inferring
Causes from Conditions: Abnormal Measured
Values (P. 10-4).
Wire correctly.
Replace the relay.
Replace the SSR.
Connect a bleeder resistor to prevent operation
due to leakage current.
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Table of Contents
Troubleshooting
