129
Sr. No.
Fault name
Operation panel display
Troubleshooting of cause of failure
Countermeasures for fault
handling
40
Wave - by - wave
current limiting fault
1. Whether the load is too large or the
electric machine is blocked
2. The selection of frequency inverter is
small
1. Reduce the load and check
the motor and machinery
2. Choose the frequency
inverter with higher power
level
41
Switching motor
failure during
operation
1. Change the current motor selection
through terminals during the
operation of the frequency inverter
1. Switch the motor after the
frequency inverter stops
6.2 Matters needing attention in commissioning:
1) How to shorten the actual acceleration time in V/F control mode?
Description of
phenomenon
If the actual acceleration time of the motor is found during the acceleration process, it is far greater than the set
acceleration time.
Solutions
When the target frequency is less than 2 times of the rated frequency, the FF - 10 " over current suppression starting
current" can be increased, and the setting value of " over current suppression starting current" of the FF - 10
exceeds 170 each time, which is easy to cause " frequency inverter overload fault ol1" or " current limiting fault
CBC".
The target frequency is more than 2 times of the rated frequency. In the process of rapid acceleration, it is likely that
the motor will stall (the output frequency of the frequency inverter has reached the target frequency, but the actual
speed of the motor has been staying at a certain speed in the medium speed section, but the actual speed of the
motor has been staying at a lower frequency or the acceleration time is too long). At this time, the FF - 13 "
compensation coefficient for high-speed over current suppression current" can be adjusted to 100 %.
2) How to shorten the actual deceleration time under V/F control mode?
Description of
phenomenon
If the actual deceleration time of the motor is found during deceleration, it is far greater than the set deceleration
time.
Solutions
There is no additional braking resistor or feedback unit. Please increase F3 - 10 " V/F over excitation gain" setting
by 20 % each time. After increasing F3 - 10 “V/F over-excitation gain" setting, if the motor oscillation over-voltage
fault is caused, please reduce FF - 17 " over-voltage suppression voltage gain" setting.
The inverter is equipped with a braking resistor or an energy feedback unit, and the input voltage level of the
inverter is 360 - 420 v. Please adjust the FF - 32 " starting voltage of the braking unit" setting to 690 v and the F3
- 10 " V/F over-excitation gain" setting to 0.
Using shutdown DC brake, recommended setting:
F6 - 07 ( stop DC brake starting frequency )
0.5 Hz
F6 - 09 ( stop DC brake current )
100 %
F6 - 10 ( stop DC brake time )
1S
3) How to limit the output current under V/F control mode and how to prevent over current fault under extreme impact
load?
Description of
phenomenon
In order to better protect the motor, control the upper limit of motor current
Solutions
The current upper limit can be controlled by adjusting FF - 10 " over current suppression starting current" and "
current upper limit"
Sudden acceleration, sudden deceleration, or impact load type may cause “over current fault oc" or " CBC current
limiting fault". Please increase FF - 12 " over current suppression gain" setting value. If the adjustment is too large,
it may cause current oscillation. At this time, please pay attention to callback.
4) How to limit bus voltage under V/F control mode to prevent over voltage fault?
Description of
phenomenon
In constant speed power generation loads (e.g. kowtow pumping units, stone sawing machines) and shock surge
loads (e.g. high-power punching machines), over-voltage faults can easily occur during operation.
Solutions
Constant speed intermittent power generation load: please lower FF - 14 " over voltage suppression starting
voltage" setting value (factory value 770 v) and limit the upper limit value of bus voltage without specific
requirements. it is recommended to adjust it to about 720 v. if over voltage fault still occurs, please adjust ff - 18 "
over voltage suppression maximum rise limit frequency" setting value to 10 Hz or 20 Hz ( for example, load with
