Manual Torque Boost - Mitsubishi Electric 800 Series Instruction Manual

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.
Pr. Name
0
Torque boost
G000
46
Second torque boost
G010
112
Third torque boost
G020

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.
V/F V/F V/F
Initial Setting
value range
5%

3%

0 to 30%
2%

1%

0 to 30%
9999
9999
0 to 30%
9999
9999
100%
Output
voltage
Pr.0
Setting
Pr.46
range
Pr.112
0 Output
frequency
(Hz)
(G) Control parameters
Description
Set the output voltage at 0 Hz in %.
Set the torque boost value at when RT signal is ON.
Without second torque boost
Set the torque boost value at when X9 signal is ON.
Without third torque boost
Base
frequency
PARAMETERS
5
GROUP
G
589