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Application guide

Open Loop Torque Control for Induction Motor

1.  Set parameters

Relevant parameters: P1-03~P1-07

Operating requirements: Please set motor parameters P1-03~P1-07 strictly according to motor nameplate.

Attention: In case of improper information or information missing on nameplate, please contact the motor manufacturer to confirm the correct motor parameters. If the motor manufacturer can not provide the complete and correct parameters, please set the 4 basic motor parameters: rated power (P1-03), rated voltage (P1-04), rated frequency (P1-05) and rated current (P1-06). These four parameters are good enough to get good performance.

2.  Run motor parameter tuning

Set parameter P1-13=2 (static full parameter tuning) and run the motor parameter tuning function (please refer to 6.11)

3.  Set torque control related functions according to the application demands

(1)  Minimal Torque Function

Par. No.

Name

Range

Unit

Default

P1-45

Min Torque at Torque Mode Start

-100~100

%

5

P1-46

Min Torque Cut Out Speed at Torque Mode Start

0.1~50.0

Hz

3.0

 

(2)  Torque Control PI Function

Par. No.

Name

Range

Unit

Default

P4-40

Torque Control PI Proportional Gain

0~500

%

100

P4-41

Torque Control PI Integration Time

0.002~2.000

s

0.020

 

(3)  Torque Control Speed Limitation Function

Par. No.

Name

Range

Unit

Default

P5-06

Speed Limit Source Selection in Torque Mode

0~30

 

0

This parameter is used to set how the speed limit value is set in the Torque mode. When the option [0] is selected, the upper speed limit is limited by the parameter P5-08. Please refer to the parameter P 0-11 for other options.

4.  Commission

(1).  Target Torque Set. In local mode, the target torque can be set directly via the UP/DOWN key. (Setting to 1.2 via the UP/DOWN key, for example, means that the target torque is 1.2 N.m.). In remote mode, the target torque set source can be selected via parameter P0-13, e.g., setting P0-13=1 means the that target torque is given by analogue input on terminal AI1, then AI1 input 0~10V corresponds to 0%~100% rated torque. Rated torque is the value of parameter P1-08.

(2).  Start and stop the converter. Same as in speed control mode, the frequency converter can be start and stop via keyboard, DI terminal or bus communication.