(G) Control parameters Parameters
5 - 688
5.16.1 Manual torque boost
Voltage drop in the low-frequency range can be compensated, improving reduction of the motor
torque in the low-speed range.
● Motor torque in the low-frequency range can be adjusted according to the load, increasing the
motor torque at the start up.
● By using the RT signal or X9 signal, it is possible to switch between 3 types of torque boost.
Initial value for the FR-A820-00077(0.75K) or lower and FR-A840-00038(0.75K) or lower.
Initial values for the FR-A820-00105(1.5K) to FR-A820-00250(3.7K), FR-A840-00052(1.5K) to
FR-A840-00126(3.7K).
Initial values for the FR-A820-00340(5.5K), FR-A820-00490(7.5K), FR-A840-00170(5.5K), FR-A840-
00250(7.5K).
Initial values for the FR-A820-00630(11K) to FR-A820-03160(55K), FR-A840-00310(11K) to FR-A840-
01800(55K).
$
Initial value for the FR-A820-03800(75K) or higher and FR-A840-02160(75K) or higher.
Starting torque adjustment
● Assuming Pr. 19 "Base frequency voltage" is 100%, set the output voltage at 0 Hz to Pr. 0 (Pr. 46,
Pr. 112) in percentage.
● Perform the adjustment of the parameter little by little (approximately 0.5%), and confirm the
status of the motor each time. The motor may overheat when the value is set too high. Do not use
more than 10% as a guideline.
Pr. Name
Initial
value
Setting
range
Description
0
G000
Torque boost
6%
0 to 30% Set the output voltage at 0 Hz in %.
4%
3%
2%
1%
$
46
G010
Second torque boost 9999
0 to 30% Set the torque boost value at when RT signal is ON.
9999 Without second torque boost
112
G020
Third torque boost 9999
0 to 30% Set the torque boost value at when X9 signal is ON.
9999 Without third torque boost
Fig. 5-339:
Relationship between output frequency and
output voltage
I002748E
V/F
V/F
0
100%
Output
voltage
Setting
range
Output
frequency
(Hz)
Base
frequency
Pr. 0
Pr. 46
Pr. 112
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