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IV. Exceptions and Handling
See table 4-2 for the common abnormal phenomena and countermeasures of frequency inverter in operation:
Abnormal phenomena
Possible causes and countermeasures
The motor does not
rotate
keypad does not
display
Check whether there is a power outage, whether the input power supply is out of phase,
and whether the input power cable is connected incorrectly
The keypad is not
displayed, but the
internal charging
indicator is on
Check whether there are problems with the wiring and sockets related to the keypad, and
measure the voltage of each control power supply in order to confirm whether the switching
power supply works normally. If the switching power supply does not work normally, check
whether the inlet (+,-) sockets of the switching power supply are connected well, whether
the starting vibration is damaged or whether the voltage stabilizing tube is normal.
The motor is buzzing
The motor load is too heavy, try to reduce the load
No abnormalities
were found
Check whether it is in tripping state or not reset after tripping, whether it is in power-off
restart state, whether the keypad has been reset, whether it has entered program running
state, multi-speed running state, specific running state or non-running state, and try to
restore the factory value.
Confirm whether the operation instruction is given
Check whether the operating frequency is set to 0
The motor cannot accelerate and decelerate
smoothly
Inappropriate setting of acceleration and deceleration time, increase acceleration and
deceleration time
If the current limiting value is set too small, increase the limiting value
Over-voltage protection acts during deceleration to increase deceleration time
Improper setting of carrier frequency, overload or oscillation
Overload and insufficient torque. Increase torque boost value in V/F mode. If it still cant
meet the requirements, you can switch to vector control mode. At this time, pay attention to
the fact that the motor parameters should be consistent with the actual values. If it still cant
meet the requirements, it is recommended to switch to advanced vector control mode. At
this time, you should still pay attention to whether the motor parameters are consistent with
the actual values, and it is best to tune the motor parameters.
The motor power does not match the inverter power. Please set the motor parameters to
actual values
One with more than one motor. Please change the torque lifting mode to manual lifting
mode
Although the motor can rotate, it can not
adjust the speed
Inappropriate setting of upper and lower frequency limits
The frequency setting is too low, or the frequency gain setting is too small
Check whether the speed regulation mode used is consistent with the set frequency
Check whether the load is too heavy, over-voltage stall or over-current limit
The speed of the motor changes during
operation
Load fluctuates frequently, so minimize its variation
Inverter is seriously inconsistent with motor rating. Please set the motor parameters to
actual values
Poor contact of frequency setting potentiometer or fluctuation of frequency given signal.
Change to digital frequency giving mode or increase the filtering time constant of analog
input signal
The rotation direction of the motor is opposite
Adjust the phase sequence of output terminals u, v and W.
Set the running direction (00.12=1) to reverse
Direction uncertainty caused by output phase failure, please check the motor wiring
immediately
Table 4-2 Common Abnormal Phenomena and Countermeasures
