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Adjustment of the output torque
(current) of the motor
4.8 Adjustment of the output torque (current) of the motor
4.8.1 Manual torque boost (Pr. 0, Pr. 46, Pr. 112)
(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.
Purpose Parameter that must be Set Refer to Page
Set starting torque manually Manual torque boost Pr. 0, Pr. 46, Pr. 112 146
Automatically control output current
according to load
Advanced magnetic flux
vector control
Pr. 71, Pr. 80, Pr. 81, Pr. 89, Pr. 450,
Pr. 451, Pr. 453, Pr. 454,
Pr. 569, Pr. 800
148
Compensate for motor slip to secure
low-speed torque
Slip compensation Pr. 245 to Pr. 247 151
Limit output current to prevent inverter
trip
Stall prevention operation
Pr. 22, Pr. 23, Pr. 66,
Pr. 154, Pr. 156, Pr. 157
152
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
Number
Name Initial Value
Setting
Range
Description
0 Torque boost
0.4, 0.75K 6%
0 to 30% Set the output voltage at 0Hz as %.
1.5K to 3.7K
4%
5.5K, 7.5K 3%
11K to 55K 2%
75K or higher 1%
46
Second torque
boost
9999
0 to 30%
Set the torque boost value when the
RT signal is ON.
9999 Without second torque boost
112
Third torque
boost
9999
0 to 30%
Set the torque boost value when the
X9 signal is ON.
9999 Without third torque boost
V/F
V/F
V/F
Output
voltage
P
r. 0
P
r.46
Setting
range
Base
frequency
0
100%
Output
frequency
(Hz)
P
r. 11 2