Chapter 7 Application Reference
Shenzhen Hpmont Technology Co., Ltd.
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HD31 Series User Manual V1.1
7.2
Debugging for Switching between VF and PF
VF = variable frequency, PF = power frequency
When the inverter pump needs to be switched to power frequency, the default does not detect the
phase sequence. Switching current is large, especially for some high-power pumps, instantaneous
impact current of switching may be an instant lower power grid voltage, affecting other equipment to
normally run, even will cause the switch jump protection, but also affect the service life of the
frequency contactor.
At this time, inverter phase sequence will be needed to detected and smooth switching to power
frequency, and the current will be much smaller.
Notes for smooth switching from variable frequency to power frequency:
•
According to the actual pump configuration, follow the wiring diagram in 7.1 for professional
wiring.
•
When P00.31 = 1 (switching function enable), if the inverter reports E0037 (input error phase fault)
or view.
D00.19 = 1 indicates that input phase sequence error phase of current inverter. At this time need to
change any two phases of the control cabinet, and again confirm the power frequency contactor
phase sequence and the inverter output phase sequence are consistent, that L1- U, L2-V, L3-W.
•
Use the commissioning mode to confirm the direction of rotation of the motor. If the reverse
direction, change the motor side to input any two phase sequence (please ensure F00.17 = 0, do
not change the direction of rotation by changing F00.17 = 1).
•
Switching frequency should be greater than the power frequency of the grid 0.50 - 1.00Hz. When
P00.00 = 1 (water supply debugging mode), change the frequency of F00.13. When P00.00 = 0
(Water supply operation mode), change the value of P00.08.