V&T Technologies Co., Ltd.
http://www.ecodrivecn.com
Appendix C FAQ
146
Appendix C FAQ
I. In the case of vector control 2, why did the inverter have abnormal operation?
A: (1) Check if there exists large difference between the power class of the motor and that of the inverter;
A; (2) Check if parameter auto-tuning has been performed under vector control 2. For details, refer to the
setting process for parameter auto-tuning in Appendix B.
A: (3) Check if the control lines for the V5
−
H
−4T18.5G/22L or current sensor of above power class are
loose or dislocated.
A
II. In the case of vector control 1, why did the inverter have abnormal operation?
A: (1) Check if parameter auto-tuning has been performed under vector control1, For details, refer to the
setting process for parameter auto-tuning in Appendix B.
A: (2) Check if the control lines for the V5
−
H
−4T18.5G/22L or current sensor of above
power class are
loose or dislocated.
III. Why was the operating frequency of the inverter kept at 0Hz upon reverse operation?
A: (1) Check if the frequency is set as 0;
A:
(2) Check if the inverter function code parameter P3.09 is set as 0. If not, change it to 0.
IV. The inverter had been connected with braking resistor featuring dynamic braking, why didn’t it
work?
A: (1) Check if the braking resistor is connected between the main circuit terminals B1 and B2;
A: (2) Check if the inverter function code parameter PA.09 is set as 1. If not, change it to 1.
V. Why was there large deviation on the correspondence relation between the analog input and the
set frequency?
A: (1) Check if the jumpers of analog input type and control board are properly set. For the analog voltage
input, toggle the corresponding channel to the V end of the jumper; for the analog current input, toggle the
corresponding channel to the I end of the jumper.
A: (2) Calibrate the analog input curve according to function codes P6.00 to P6.2. For details, refer to the
description of P6 group in Chapter 6 Parameter Description.
VI. Why was there large deviation on the correspondence relation between the analog output and
the relevant function output?
A: (1) Check if the jumpers of analog output type and control board are properly set. For the analog voltage
output, toggle the corresponding channel to the V end of the jumper; for the analog current output,
toggle the corresponding channel to the I end of the jumper.
A: (2) Calibrate the analog output curve according to function codes P7.05 to P7.09. For details, refer to the
description of P7 group in Chapter 6 Parameter Description.
