Mitsubishi Electric 800 Series, Instruction Manual, Page: 590 / 727

(G) Control parameters
PARAMETERS
589
5
GROUP
G
5.16.1
Manual torque boost

Initial value for the FR-A860-00027.

Initial value for the FR-A860-00061.

Initial values for the FR-A860-00090, 00170.

Initial value for the FR-A860-00320 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.
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.
Pr. Name
Initial
value Setting
range
Description
0
G000
Torque boost
5%

0 to 30% Set the output voltage at 0 Hz in %.
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
V/F V/F V/F
Output
voltage
Pr.0
Pr.46
Setting
range
Base
frequency
0
100%
Output
frequency
(Hz)
Pr.112