Motor Torque; Manual Torque Boost (Pr. 0, Pr. 46) - Mitsubishi Electric FR-F740 EC Instruction Manual

Parameter
6.2

Motor torque

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
6.2.1

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

You can compensate for a voltage drop in the low-frequency region to improve motor torque re-
duction in the low-speed range.
Motor torque in the low-frequency range can be adjusted to the load to increase the starting mo-
tor torque.
Switch-over between parameters 0 and 46 is possible via the RT input signal.
Pr.
Name
No.
0
Torque boost
46
Second torque boost
The above parameter can be set when Pr. 160 = 0.
FR-F700 EC
Parameter that must be set
Manual torque boost
Simple magnetic flux vector control
Slip compensation
Stall prevention operation
Multiple rating setting
Setting
Initial Value Description
Range
00023 6%
00038
to 4%
00083
00126 /
3%
00170
Set the output voltage at 0Hz
0–30%
00250
as %.
to 2%
00770
00930 /
1.5%
01160
01800
1%
or more
Set the torque boost value when
0–30%
the RT signal is on.
9999
9999 Without second torque boost
Motor torque
Refer to
Section
Pr. 0, Pr. 46 6.2.1
Pr. 71, Pr. 80, 6.2.2
Pr. 90
Pr. 245–Pr. 247 6.2.3
Pr. 22, Pr. 23, 6.2.4
Pr. 66, Pr. 154,
Pr. 156, Pr. 157
Pr. 570 6.2.5
Parameters referred to
3 Base frequency
19 Base frequency
voltage
71 Applied motor
80 Motor capacity
178–189 Input terminal
function selection
Refer to
Section
6.4.1
6.4.1
6.7.2
6.2.2
6.9.1
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