K&R GT600-4T132G User Manual page 152

6. Description of Parameters
Function Code
F3-18
F3-19
F3-20
F3-21
In high frequency area, motor drive current is small. Bigger motor speed dip is caused by current
limit level compared with below rated frequency. To improve motor running characteristic, you
can lower current limit level above rated frequency.
The current limit function above rated frequency helps to improve acceleration performance in
the applications, such as centrifuge, where high running frequency and several times of field
weakening are required, and load inertia is large.
The current limit level above rated frequency = (fs/fn) x k x LimitCur.
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●
●
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Figure 6-41 Current limit above rated frequency
6
- 150 -
Parameter Name
Current limit level
Current limit selection
Current limit gain
Compensation factor of speed
multiplying current limit
fs: running frequency
fn: rated motor frequency
k: compensation factor of speed multiplying current limit level (F3-21)
LimitCur: current limit level (F3-18)
Current limit level
above rated frequency
●
Current limit level 150% indicates 1.5 times of rated current of the AC drive.
Note
●
For high-power motor with carrier frequency below 2 kHz, lower the current
limit level. This is because the overcurrent fast prevention function is enabled in
advance of the current limit function due to increase of pulsating current, which
will result in insufficient torque output.
Setting Range
50% to 200%
0: Disabled
1: Enabled
0 to 100
50% to 200%
Twice of rated
Rated
fruquency
frequency
Default
150%
1
20
0