Inferring Causes From Conditions: Abnormal Measured Values; The Measured Value Is Abnormal Or Measurement Is Not Possible - Omron E5AR-T User Manual

Section 10 Troubleshooting
10.3 Inferring Causes from Conditions: Abnormal
Measured Values

■ The Measured Value Is Abnormal or Measurement Is Not Possible

The polarity or connections to the temperature
sensor are not correct.
A temperature sensor that cannot be used with the
E5AR-T/ER-T is connected.
The temperature sensor has a broken wire, a short-
circuit, or has deteriorated.
A temperature sensor is not connected.
Compensating leads that are incompatible with the
thermocouple are being used.
A metal device other than the thermocouple or
compensating leads is connected between the
terminals of the E5AR-T/ER-T and thermocouple.
The terminal connection screws are loose, resulting
in a bad connection.
The leads or compensating leads of the
thermocouple is too long and resistance is affecting
the system.
The 3 wires between the terminals of the E5AR-T/
ER-T and the platinum resistance thermometer have
different resistances.
The E5AR-T/ER-T is receiving noise from peripheral
devices.
The leads and power line of the temperature sensor
are too close, and induction noise is being received
from the power line.
The mounting location of the temperature sensor is
too far from the point of control and the thermal
response is slow.
The ambient operating temperature of the E5AR-T/
ER-T exceeds the rated temperature.
Wireless devices are used near the E5AR-T/ER-T.
The temperature of the terminal plate is not uniform
due to heat dissipation from peripheral devices.
The terminal plate of the E5AR-T/ER-T is exposed
to a strong air flow.
The input type switch setting is not correct.
The Input Type parameter is not set correctly.
The temperature unit setting is not correct.
The measured temperature appears to deviate after
setting an input correction.
The units of the parameter settings are not correct.
The host system program is not correct.
10-4
Possible cause Solution
Connect the wires correctly.
Change to a temperature sensor that can be used
with the E5AR-T/ER-T.
Replace the temperature sensor.
Connect a temperature sensor.
• Directly connect a thermocouple with long leads.
• Use compatible compensating leads.
Connect with a device that is designed for use with
thermocouples.
Tighten the screws securely.
• Use thick compensating leads.
• Change the wiring and locations to allow shorter
lengths.
Use wires of the same resistance for terminals A,
B, and B.
• Separate the E5AR-T/ER-T from noise-emitting
devices.
• Install a surge absorber or noise filter in noise-
emitting devices.
• Separate the leads from the power line.
• Run the leads and power line through separate
conduits or ducts.
• Do not wire the leads in parallel with the power
line.
• Change the wiring to allow shorter leads.
• Use shielded cable for the leads.
Mount the sensor so that the end of the protective
tubing approaches the point of control.
Keep the ambient operating temperature within the
specified range: 10 to 55°C.
Shield the E5AR-T/ER-T.
Install the E5AR-T/ER-T in a location where it is
not exposed to heat dissipation.
Prevent air flows from blowing on the terminal
plate.
Set the input type switch to the correct setting for
the input.
Set the correct input type.
Set the correct temperature unit.
Set the input correction to 0.0.
Correct the host system program.