Omron E5AJ-A2HB Operation Manual page 44

Troubleshooting
Phenomenon
The process value is abnormal or not
obtained.
No control output is obtained.
The heater burnout detecting function
is abnormal.
Simple Method to Determine Temperature Controller Error or Sensor Error
When Thermocouple is Used If the temperature displayed by the
When Platinum Resistance
Thermometer is Used
Probable cause
The input polarity is wrong or the
connection is wrong.
The input-type setting is incorrect.
No compensating lead wires are used
for the extension of the thermocouple.
The thermocouple and E5jJ is
connected via wires other than proper
lead wires.
The sensor is broken or
short-circuited.
The E5jJ is influenced by noise or
other induction.
C is used instead of F or vice versa.
The process value is shifted because
the input shift function is used.
No Control Output Unit is connected.
Event input 2 of the E5jJ is set to
STOP.
No Current Transformer (CT) is used.
The heater burnout alarm value is not
proper.
The heater is turned ON or OFF with
an output other than the control
output.
the input terminals of the
and it is presumed that the sensor is broken, short-circuited, or incorrectly wired.
If the temperature displayed by the
resistance of approximately 100 Ω is inserted between terminals A and –B of the
and terminals +B and –B of the
E5jJ
deemed to be normal and it is presumed that the sensor is broken, short-cir-
cuited, or incorrectly wired.
Properly wire the terminals.
Properly set the input with the
input-type selector.
Use proper compensating lead wires.
Use a dedicated thermocouple
connector. If a metal material different
from the thermocouple is used to
connect the thermocouple and E5jJ,
a temperature error may result.
Use a good sensor.
Separate the input wires as far as
possible from the origin of the noise.
Use the proper temperature unit.
Set the input shift value to 0.
Connect a Control Output Unit (sold
separately).
Open event input 2 and set the E5jJ
to RUN.
Properly connect the dedicated
E54-CT1 or E54-CT3 (sold
separately) to the E5jJ.
Set the proper heater burnout alarm
value taking into consideration the
fluctuation of the heater supply
voltage and measurement error.
Use the control output. Heater burnout
detection synchronizes with the
control output. Any other output
cannot be used.
is close to the room temperature when
E5jJ
is short-circuited, the
E5jJ
is close to 0.0 C when a resistor with a
E5jJ
are short-circuited, the
E5jJ
Section 6-2
Countermeasure
deemed to be normal
E5jJ
E5jJ
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