08
Maintenance
4
Conduct product test and maintenance every half a year to ensure the
smooth operation of the product and the good contact of NO and NC
contacts. Tighten the terminal screws with specified torque and align the
protection capability of the thermal overload relay with load according to
commissioning requirements.
Please be careful when handling and installing the thermal relay. It is
prohibited to move the product by crane with strong impact so that the
product will not be damaged and its protection characteristics will not
change.
Table 6 Analysis and Troubleshooting of Faults
Symptoms
Cause analysis
Troubleshooting method
and precautions
Misoperation
of thermal
relay without
the motor
being
overloaded.
Thermal relay
does not
operate.
Size is too small.
The set current value is smaller
than the actual operating
current of the motor.
Stong shock or vibration
Frequent start of motor
The sectional area of
connecting wire is too small,
or there is loose connection.
The size is too big
The set current value is bigger
than the actual operating
current of the motor.
The sectional area of
connecting wire is too big.
Thermal
relay does
not work.
The product is not reset.
Auxiliary contacts are not
powered-on.
Main circuit or auxiliary
circuit is burnt
Change to product with bigger size.
Fine tune the cam clockwise so that
the set current matches the actual
motor current.
Check installation status and
conduct troubleshooting. Do not
place the product in environment
with strong shock or vibration.
The start frequency of motor should
not exceed 30 times per hour.
Use standard wire and torque.
Change to product with smaller size.
Fine tune the cam counter-clockwise
so that the set current matches the
actual motor current.
Use standard wire and torque.
Press the reset button to reset the relay.
Replace thermal relay.
Replace thermal relay.
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