BENSHAW RSi GM2 Series - Auto Torque Boost

Learning Basic Features
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GM2 Series VFD
Auto Torque Boost
In V/F operation, auto torque boost adjusts the output voltage when the motor cannot be started
due to lack of starting torque. It provides a calculated voltage boost based on torque current.
Group
Code
Name
Setting
Setting Range
Unit
dr
15
Torque boost
mode
1
Auto
0–1
-
dr
26
Auto torque
boost filter gain
2
1–1000
-
dr
27
Auto torque
boost motoring
voltage gain
50.0
0.0–300.0
%
dr
28
Auto torque
boost
regeneration
voltage gain
50.0
0.0–300.0
%
Set dr.15 (Torque Boost mode) to 1 (auto). Parameters dr.26, dr.27, and dr.28 can be adjusted when
there is a lack of starting torque or when excessive current is flowing. This method outputs voltage
by adding a voltage boost quantity calculated using torque current values from the manual torque
boost settings (dr.16, dr.17).
Auto Torque Boost does not require Auto-Tuning but does require motor’s nameplate ratings
entered in the following parameters:
Code
Name
Setting Range
dr.18
Base frequency
30.00–400.00 (Hz)
bA.12
Rated slip speed
0–3000 (Rpm)
bA.13
Motor rated current
1.0–1000.0 (A)
bA.14
Motor noload current
0.0–1000.0 (A)
If you do not use motor’s nameplate ratings, each parameter is set to a default value and the auto
boost function may not be as effective.