Filter
Top Products
87
Adjustment of the output torque (current) of the motor
4
PARAMETERS
4.4 Adjustment of the output torque (current) of the motor
4.4.1 Manual torque boost (Pr. 0, Pr. 46)
<V/ F>
(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).
⋅ 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 multiple torque boost (RT signal, Pr. 46)
⋅ Use the second torque boost when changing the torque boost according to application or when using multiple
motors by switching between them by one inverter.
⋅ Pr. 46 Second torque boost is valid when the RT signal turns ON.
Purpose Parameter that must be Set Refer to Page
Set starting torque manually Manual torque boost Pr. 0, Pr. 46 87
Automatically control output current
according to load
Simple magnetic flux
vector control
Pr. 80, Pr. 90 89
Compensate for motor slip to secure
low-speed torque
Slip compensation Pr. 245 to Pr. 247 90
Limit output current to prevent inverter
trip
Stall prevention operation
Pr. 22, Pr. 23, Pr. 66,
Pr. 154, Pr. 156, Pr. 157
91
You can compensate for a voltage drop in the low-frequency range 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.
The starting torque boost can be changed by switching terminals.
Parameter
Number
Name Initial Value
Setting
Range
Description
0 Torque boost
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 37K 2%
45K, 55K 1.5%
75K or higher 1%
46
*1
Second torque
boost
9999
0 to 30%
Set the torque boost value when the
RT signal is on.
9999 Without second torque boost
*1 They can be set when Pr. 160 User group read selection = "0". (Refer to page 201.)
REMARKS
⋅ The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 136)
⋅ The RT signal is assigned to the RT terminal in the default setting. By setting "3" to any of Pr. 178 to Pr. 189 (Input terminal function
selection), you can assign the RT signal to the other terminal.
V/F
V/F
V/F
Output
voltage
P
r. 0
P
r.46
Setting
range
Base
frequency
0
100%
Output
frequency
(Hz)