Phase Loss on Delta VFD007M43B

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leejersoon

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Singapore
Hi everyone.

I am currently using a VFD007M43B with a 0.75kW, 3-Phase motor. After running for below 1 minute, the VFD halts with a display of "PHL". When I checked the manual, it says that PHL means phase loss error.

I have search on the internet on ways to trouble shoot and solve this but to no avail:

1. I tried disconnecting the motor from the VFD, then run the VFD. Phase loss occurred.

2. I change the start/stop control from a BUS to the keypad on the VFD. Phase loss still occurs.

3. I disconnected all connection except from the 3-phase supply and the motor. Phase loss still occurs.


Is there anyone that has experience with this? How can I disable the phase loss detection on the VFD? I'm really am stuck and have no more option.

I have contacted Delta but they did not reply me.

Really appreciate any help. Thank you in advance.
 
I see no mention of you having checked to make sure of .... Wait for it.... A LOST PHASE! :slaphead:

Did you check or did you assume that you have all 3 phases? Because PHASE LOSS means it is not seeing voltage on all three incoming phases, it has zero to do with control circuits, HMIs, or even the motor load. Checking control wiring and disconnecting loads and changing programming was completely pointless if you ASSUMED that there was not a blown fuse or bad connection somewhere ahead of the drive. Was there? If there was good three phase power at the terminals of the drive, then as peterson said, it's not worth spending time over, there is nothing to repair in that drive.
 
Jraef said:
I see no mention of you having checked to make sure of .... Wait for it.... A LOST PHASE! :slaphead:

Did you check or did you assume that you have all 3 phases? Because PHASE LOSS means it is not seeing voltage on all three incoming phases, it has zero to do with control circuits, HMIs, or even the motor load. Checking control wiring and disconnecting loads and changing programming was completely pointless if you ASSUMED that there was not a blown fuse or bad connection somewhere ahead of the drive. Was there? If there was good three phase power at the terminals of the drive, then as peterson said, it's not worth spending time over, there is nothing to repair in that drive.
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A quick look at their manual shows that this model is supposed to be able to accept single phase input, so one would imagine there should be a parameter to disable the phase loss protection, or it would not even be active in the first place. But there is no program parameter related to incoming phase loss protection or setup, it just says that model can accept either. That then leads to the other conclusion, it's defective, send it back.
 
Jraef said:
I see no mention of you having checked to make sure of .... Wait for it.... A LOST PHASE! :slaphead:

Did you check or did you assume that you have all 3 phases? Because PHASE LOSS means it is not seeing voltage on all three incoming phases, it has zero to do with control circuits, HMIs, or even the motor load. Checking control wiring and disconnecting loads and changing programming was completely pointless if you ASSUMED that there was not a blown fuse or bad connection somewhere ahead of the drive. Was there? If there was good three phase power at the terminals of the drive, then as peterson said, it's not worth spending time over, there is nothing to repair in that drive.
Click to expand...


Hi Jraef. Thanks a lot. I guess I should insist on measuring the mains, because when I wanted to do so, the building electrician brush me off saying there is no problem with his mains or the other machines would not work. :rant:

As for disabling the phase loss detection, I can't find it anywhere in the manual. I saw that it supports single phase, but that will not drive my 3-phase motor.

Seems like there's no other way for me but to keep pushing Delta for a solution then.

Thanks again Jraef :thumbsup:. Thanks to petersonra as well, I'll try to find extra budget somewhere...
 
leejersoon said:
Hi Jraef. Thanks a lot. I guess I should insist on measuring the mains, because when I wanted to do so, the building electrician brush me off saying there is no problem with his mains or the other machines would not work. :rant:
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Measure it at the drive input terminals.

leejersoon said:
I saw that it supports single phase, but that will not drive my 3-phase motor.
Click to expand...
Many small inverters can, and do, run with a single phase input and a three phase output.
 
But that single phase input must deliver a much higher current to supply the same power.

One way that the unit could work off single phase without an explicit setting to disable the phase loss alarm:
If three phases are present at power on, it will expect three to continue. If only one phase is present at startup, there can be no phase "loss".

Tapatalk!
 
I have a few lift stations that are designed to run on single phase but they have three phase motors and run fine, but the key is the drives are all double the required size because they will have to handle the 1.732 increase in current on the single phase supply we used the Allen Bradley Flex 70's and have never had a problem.

Another point is a mistake a few electricians make when checking for voltage, never check between a phase and neutral or ground, if there are any loads on the supply even with an open phase fuse you can still read a voltage between each phase and ground through these loads, always check phase to phase such as A to B, A to C, then B to C, this is the only way to be sure you do have all three phases.

With a .750kw motor you could go to a single phase motor if you don't need the speed control as this is less then a horse, most likely a 3/4hp, any small speed control would also work for it if you do need it.
 
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