K&R GT600-4T132G User Manual page 153

6.5.4 Voltage Limit and Braking Unit Applied Voltage
When bus voltage rises above the value set in F3-22, the motor becomes regenerative. This
function prevents overvoltage trips by adjusting the output frequency to extend deceleration time
in this case.
If actual deceleration time cannot satisfy the requirement, increase the value of F3-10 (V/F over-
excitation gain) adequately.
Figure 6-42 Voltage limit
Voltage limit
during acceleration
Voltage limit
Bus
voltage
Output
frequency
Voltage limit
Function Code Parameter Name
F3-22 Voltage limit
F3-23 Voltage limit selection
F3-24 Frequency gain for voltage limit
F3-25 Voltage gain for voltage limit
F3-26 Frequency rise threshold during
voltage limit
F9-08 Braking unit applied voltage
F3-10 V/F over-excitation gain
F3-11 V/F oscillation suppression
gain
F9-03 Overvoltage protection gain
F9-04 Overvoltage protection voltage
When using braking resistor, braking unit or energy feedback unit, pay attention to
Note
the following aspects:
●
Set F3-10 (V/F over-excitation gain) to 0. Otherwise, too large current may occur
during drive running.
●
Set F3-23 (overvoltage suppression selection) to 0 (disabled). Otherwise, the
deceleration time may become longer.
Voltage limit
during constant running
Voltage limit
Bus
voltage
Time
Output
frequency
Time
Voltage limit
Setting Range
650 to 800 V
0: Disabled
1: Enabled
0 to 100
0 to 100
0 to 50 Hz
650 to 800 V
0 to 200
0 to 100
0 (no overvoltage stall) to 100
650 to 800 V
6. Description of Parameters
Voltage limit
during deceleration
Voltage limit
Bus
voltage
Time
Output
frequency
Time
Voltage limit
Time
Time
Default
760 V
1
30
30
6
5 Hz
760 V
64
40
30
770 V
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