Troubleshooting
345
T
roubl
e
s
hoot
ing
Fault
Remedy
•
Confirm the motor time constant (PAR_53) is set correctly (Note:
inverter efficiency will decrease significantly if this setting is
incorrect).
•
Confirm the number of motor poles (PAR_16) is set correctly.
•
If CON_33 is set to “Kpd Kpd Kpd,”, are CON_34–CON_36
(torque limits) set correctly?
[Note: CON_34–CON_36 define the torque limit of the inverter.
Adjust the torque limit If it has been set too low. The L100
inverters can withstand 150% output for 1 minute. The use time
and frequency must be limited if the inverter will be operated in
excess of its limits.]
(3) Motor rotates but
does not
accelerate.
Check the encoder pulse setting at PAR_24.
•
The default setting is “1024” for HIGEN vector motors. If a
different type of motor is connected, contact the encoder
manufacturer and request the correct pulse setting.
Set FUN_01 to “Keypad”, FUN_02 to “Keypad1”, and FUN_12
(Speed 0) to 100.0 rpm. Then, press [FWD] to check if the motor
rotates. If the motor does not rotate, check the encoder cable
connection.
•
If the encoder cables are connected incorrectly, the motor will
rotate at low speed (30-60 rpm), the current can get as high as
150% of the rated current, and the motor will rotate in one
direction only.
If the motor is rotating too slowly (30–60 rpm), stop the motor and
swap the positions of the A and B phase cables at the encoder
terminals.