Sumitomo CX - Page 15

HMP-1817E 6 (15/18)
Table 4. Causes and actions to be taken for general troubles on the equipment
Trouble Cause Action
A) The motor does not start
with no load.
The motor is not powered. Check if it is powered.
Two of jointing wires are bad. Modify the bad part.
Error of operation or contact of
switches and actuator.
Chec
k the jointing wires and
connection.
B) Abnormal noise
Abrasion damage of bearing.
Single phase drive.
Replace the bearing.
Check the power supply by
voltmeter.
C) Reverse rotation Wrong wire connection Repair to correct wire
connection with connecting
diagram.
D) Fuse is broken. Coil winding and lead wires are
short-circuited.
Overload
Lack of capacity of fuse
Check the short-
circuited point
and repair it.
Lower the load to appropriate
value.
Replace with suitable one.
E) Rotation speed does not
increase.
Wrong connection of star delta
actuator.
Connect properly.
F) Howling Over-
current and heating due
to contact of rotor and stator.
Replace and repair the motor.
The spacing between rotor and
stator is not uniform
Replace and repair the motor.
One phase of coil winding of
stator is short-circuited.
Replace and repair the motor.
G) Over-current relay operates.
Switch is heating.
Wrong selection of the relay,
lack of capacity of switch.
Overload
Replace with suitable one.
Lower the load to appropriate
value.
H) Overheat Unbalance of power supply
Voltage drop
Overload
Contact the electric power
company.
Contact the electric power
company.
Lower the load to appropriate
value.
I) The speed decreases
immediately.
Voltage drop
Overload
Trouble of star delta actuator
Contact the electric power
company.
Lower the load to appropriate
value.
Adjust the contact part.