N3 Drive Operations Manual
(Advanced) Parameter Details; A129
– A137
Cont.
73
3.) Parameter b009 (00
– 17) sets the V/f pattern. The value of the output voltage is set as a percentage of
maximum by the values of B and C at the frequencies shown. The starting torque can be increased by
parameter A129 (torque boost gain) as shown in the fig.
below.
B
C
100%
Voltage
A129
1
2.5/3.0
50/60
Hz
A129 Torque Boost Gain
Fig. 19.28
Note: When A129=0 the torque boost function is invalid.
4.) In an induction motor, there is slip due to the load torque resulting in a decrease in motor RPM.
To compensate for the speed change it is necessary to boost the output voltage. Parameter
A131 (motor rated slip compensation) is used to accomplish this function and is calculated as
per the following equation.
Slip frequency boost =
Output Current - (A130)
× (A131)
Note : A002 = motor rated current
(A002) - (A130)
A130 = motor no load current
A131 approximate value =
(Motor synchronization speed
– Rated speed) / Motor synchronization speed
Marked on the motor nameplate
Cont.
b009
B
C
50 Hz
60 Hz
00
0 9
7.5%
4.5%
01
10
10%
7%
02
11
11%
8.5% / 8%
03
12
12%
9.5% / 9%
04
*
17.5%
4%
05
*
25%
5%
*
13
20.5%
7%
*
14
28.5%
8%
06
15
45.0%
1.0%
07
16
55.0%
1.0%
08
17
65.0%
1.0%
Motor
synchronization
speed
(RPM)=
120
× Motor rated frequency (50Hz or 60Hz)
Motor Poles
