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Adjust the output torque (current) of the motor
4
PARAMETERS
4.3 Adjust the output torque (current) of the motor
4.3.1 Manual torque boost (Pr. 0, Pr. 46)
(1) Starting torque adjustment
On the assumption that Pr. 19 Base frequency voltage is 100%, set
the output voltage at 0Hz in % to Pr. 0 (Pr. 46).
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.
(2) Set two kinds of torque boosts (RT signal, Pr. 46)
When you want to change torque boost according to applications, switch multiple motors with one inverter, etc., use Second
torque boost.
Pr. 46 Second torque boost is valid when the RT signal is on.
For the terminal used for RT signal input, set "3" in any of Pr. 178 to Pr. 182 (input terminal function selection) to assign the function.
Purpose Parameter that should be Set Refer to Page
Set starting torque manually Manual torque boost Pr. 0, Pr. 46
73
Automatically control output current
according to load
General-purpose magnetic
flux vector control
Pr. 71, Pr. 80
75
Compensate for motor slip to secure
low-speed torque
Slip compensation Pr. 245 to Pr. 247
78
Limit output current to prevent
inverter trip
Stall prevention operation
Pr. 22, Pr. 23, Pr. 66, Pr. 156,
Pr. 157
79
Motor torque reduction in the low-speed range can be improved by compensating a voltage drop in the low-frequency range.
Motor torque in the low-frequency range can be adjusted to the load to increase the starting motor torque.
Two kinds of start torque boosts can be changed by switching between terminals.
Parameter
Number
Name Initial Value
Setting
Range
Description
0 Torque boost
FR-D720-042 or less
FR-D740-022 or less
FR-D720S-008 to 042
6%
0 to 30% Set the output voltage at 0Hz as %.
FR-D720-070 to 165
FR-D740-036 to 080
FR-D720S-070 and 100
4%
FR-D720-238 and 318
FR-D740-120 and 160
3%
46 ∗
Second torque
boost
9999
0 to 30% Set the torque boost when the RT signal is on.
9999 Without second torque boost
* The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 162)
REMARKS
The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 116)
V/F
V/F
V/F
Output voltage
P
r. 0
P
r. 46
Setting range
Base frequency
0
100%
Output frequency (Hz)