Basic Parameter Group 01
PARAMETER DESCRIPTION 68
5.2.4 Torque boost V/F
For an inverter controlled by V/F mode, when the motor starts up, the starting torque is usually insufficient
since the output voltage of the inverter is low. In this case, the output voltage can be elevated by setting the torque
boost 01-10(P.0) properly, and thus getting a better starting torque.
Torque boost
If 01-10(P.0)=6% and 01-04(P.19)=220V,and when output frequency of the inverter is 0.2Hz, the output voltage is:
VHz
Hz
Vf 03.14%62.0
50
%6%100
22010(P.0)-01
03(P.3)-01
10(P.0)-01%100
04(P.19)-01
If RT is “on,” “the second torque boost” on 01-24(P.46) is valid (Note 2).
Note: 1. If the set value of 01-10(P.0) is too high, it will activate inverter over current protection and fail to start.
2. Please refer to Section 5.2.10 for the second function.
3. RT mentioned in this section is the function name of the “multi-function digital input terminal”. Please refer to
03-00(P.83), 03-01(P.84), 03-03(P.80), 03-04(P.81) for function selection of the multi-function digital input
terminal. For related wiring, please refer to Section 3.7 Terminal wire arrangement.
5.2.5 Starting frequency
When the motor starts up, the instantaneous output frequency of the inverter is called “starting frequency”.
Starting frequency
If target frequency of inverter is lower than 01-11(P.13) value, the motor will not run. When given the start signal to
motor, the output frequency will go up from the value of 01-11(P.13).
Time
Output
frequency
(Hz)
ON
Run signal