Can 30kVA 3 Phase Frequency Converter be Used with Independent Single-Phase Loads?

We have a three phase input three phase output frequency converter HZ-50-3330 and we are using for 50 Hz testing of equipment. There has been some discussion that has come up if it is okay to use this unit with a non 3 phase secondary output. (i.e. 1 or 2 single phase independent units each less than 10 KVA)
Can you please let us know it would be possible to use the secondary side with independent single phase loads each less than 10 kVA? Is each phase being independently regulated?

Michelle wrote:
Yes, this three-phase input three-phase output HZ-50-3330 you purchased can use the secondary side with independent single-phase loads, each load is less than 10 kVA, and each phase can be adjusted independently. However, we do not recommend that you use the three-phase as a single-phase for a long time, which will cause certain damage to the power supply shortly.
Specific operation method: When using single-phase (such as single-phase 230V), the wiring is to connect U-N, or V-N, or W-N (recommended to use V-N), and then set the knife switch to the high level (the knife switch needs to be pushed up to correspond to Phase voltage 0-300V), selecting the switch on the panel to V phase (as shown in the picture), then adjust the ADJ potentiometer to adjust the voltage to 230V, and finally set the frequency to 60Hz.

ATO wrote:
Thanks for confirming the unit is capable of this.
When you say it is not recommended to use three-phase as single-phase for a long time, what is considered a “long time”?
Another question, can you please confirm if only 2 phases can be loaded with no load on the 3rd phase?

Michelle wrote:
This frequency converter is a three-phase output. If you use it as a single-phase output for a long time, it will cause the output to be unbalanced and will damage the machine, which is a phase error. The long time here is when you use the machine as a single-phase output continuously for more than a week or a month.
In addition, no matter U-N, or V-N, or W-N can apply the load, as long as it does not exceed the capacity of the converter 10KVA. If you only use one phase, it is recommended to use V-N.

ATO wrote:
Thanks for the additional insight on the unit we have. Based on your recommendations it seems we can do the following (Please correct me if I’m misunderstanding):
Load unit to a max imbalance of 100% as long as the load is not operating continuously over 1 week (168 hours) and less than 10 kVA (single phase).
V-N is preferred as the first output when in single phase operation.
Please let me know if there are any other aspects to account for when operating in this mode.

Michelle wrote:
Yes, you are right. But about the load capacity, please note that if it is an induction motor, such as a motor type load, the motor has a starting inrush current, so pay attention to checking whether the capacity of the variable frequency power supply matches.