Adjust The Output Torque (Current) Of The Motor; Manual Torque Boost (Pr. 0, Pr. 46, Pr. 112) - Mitsubishi Electric FR-A760 Series Instruction Manual

Adjust the output torque (current) of the motor

4.8 Adjust the output torque (current) of the motor

Purpose
Set starting torque manually
Automatically control output current
according to load
Compensate for motor slip to secure
low-speed torque
Limit output current to prevent inverter
trip
Change the overload current rating
specifications
4.8.1

Manual torque boost (Pr. 0, Pr. 46, Pr. 112)

You can compensate for a voltage drop in the low-frequency region to improve motor torque reduction in the low-
speed range.
Motor torque in the low-frequency range can be adjusted to the load to increase the starting motor torque.
Three types of starting torque boost can be changed by switching terminals.
Parameter
Name
Number
0 Torque boost
46 Second torque boost
112 Third torque boost
(1) Starting torque adjustment
⋅ On the assumption that Pr. 19 Base frequency voltage is 100%, set the output voltage at 0Hz in % in Pr. 0 (Pr. 46, Pr. 112).
⋅ Adjust the parameter little by little (about 0.5%), and check the motor status each time. If the setting is too large, the
motor will overheat. The guideline is about 10% at the greatest.
132
Parameter that must be Set
Manual torque boost
Advanced magnetic flux
vector control
Slip compensation
Stall prevention operation
Multiple rating setting
Initial Value
00017
00040
00061, 00120
00220 or more
9999
9999
100%
Output
voltage
Pr.0
Setting
Pr.46
range
Pr.112
0 Output
frequency
(Hz)
Pr. 0, Pr. 46, Pr. 112
Pr. 71, Pr. 80, Pr. 81, Pr. 89, Pr. 450,
Pr. 451, Pr. 453, Pr. 454,
Pr. 569, Pr. 800
Pr. 245 to Pr. 247
Pr. 22, Pr. 23, Pr. 66,
Pr. 154, Pr. 156, Pr. 157
Pr. 570
V/F V/F V/F
Setting
Range
5%
3%
0 to 30% Set the output voltage at 0Hz as %.
2%
1%
Set the torque boost value when the RT
0 to 30%
signal is on.
9999 Without second torque boost
Set the torque boost value when the X9
0 to 30%
signal is on.
9999 Without third torque boost
Base
frequency
Refer to Page
132
134
137
138
143
Description