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Guide to parameter setting of closed-loop process control (PID control) for V&T EcoDriveCN® variable frequency drives

Wiring

Wiring of main circuit: connect R, S, T to three phase input power soure; connect U, V, W to the motor. Wiring of control circuit:

• 1, wiring of closed-loop setting: if digital setting, no need to connect outside input setting. If analog setting, connect to the corresponding analog terminals.
• 2, wiring of closed loop with feedback: Connect the analog feedback to the corresponding analog terminals.
• Detailed wiring, please refer to the exact requirement of system, and refer to the manual.

Tuning method

• 1, parameter self-learning. Please refer to guide of parameter self-learning adjustment for details.
• 2, Please set P0.03 = 1: closed-loop process control with analog feedback.
• 3, Set P1.02: prime setting of closed-loop process control with analog feedback, choose 0. For P8.00, digital setting.
• 4, Set P1.05: prime feedback method of closed-loop process control with analog feedback, configure according to the exact requirement of terminals with feedback.

Tuning effect

1, if setting P1.02=0, then the target value is for P8.00. If P8.00, set the value to 5V.

If the feedback value is 5V, then it reaches the balance status.
If less than 5V, the speed increase.
If more than 5V, the speed decrease.
Note the limit deviation problem of P8.07

2, if setting P1.02=1, the target value is for AI1. If AI1, adjust to 5V.

If the feedback value is 5V, then it reaches the balance status.
If less than 5V, the speed increase.
If more than 5V, the speed decrease.

3, For other setting, it's similar.

Remark

• 1, the limit deviation problem of P8.07
• 2, The value of P1.01 and P1.05 can be setted to same value
• 3, For parameters of KP, KI and KD, please adjust to suitable values, according to the exact Site conditions.
• 4, closed-loop process control, is PID control.