User Manual of EM760 High-Performance Inverter Chapter 7 Instructions on control performance 7.1 Asynchronous motor control 7.1.1 Asynchronous motor VF control VF control is suitable for general-purpose loads such as fans and pumps, or when multiple motors are driven by one inverter or the power ofthe inverter is quite different from that ofthe motor. Debugging methods for common issues on VF control: (1) It’shard to balance the speed during simple synchronous control Set F05.11=0.00 (2) Same frequency setting results in too large current for fan and water pump control Set F05.11=0.00 (3) Motor jittering Regulate F05.13, to higher values first.
(4) Imbalanced loads on multiple motors driving the same load Set F05.15 as rated slip frequency of the motor. (5) Insufficient power under low frequency A. Set F05.10 and F05.11 as 0 first when adjusting multi-segment VF curve B. Set F05.00 as 1 and F00.01 as 0 C. Set inverter frequency as 0.5 Hz in no-load condition. Run the inverter, and check the output current F18.06. If the output current is less than the rated value of the motor, increase F05.02 until the former approaches the latter. D. Set inverter frequency as 2 Hz in no-load condition. Run the inverter, and check the output current F18.06.
If the output current is less than the rated value of the motor, increase F05.04 until the former approaches the latter. E. Set inverter frequency as 5 Hz in no-load condition. Run the inverter, and check the output current F18.06. If the output current is less than the rated value of the motor, increase F05.06 until the former approaches 80% of the latter. F. Run the inverter in with loads. If running with loads is normal but the output current is a bit excessive, decrease F05.06 slowly as long as the running is not affected. If load driving is still a problem, go on to increase F05.02, F05.04 and F05.06 and follow C, D, and E for commissioning.
The current shouldn’t get greater than 1.5 times of rated motor current. 200