Star Delta to Inverter?

[joseph_e2]

I've also heard the 50/50/90 rule. 50% chance it'll run forward, 50% chance it'll run backward, 90% chance I'll guess wrong. Goes back to Murphy being an optimist.

 

[OkiePC]

I've never tried one of these on a VFD output:

https://us.rs-online.com/product/fluke/fluke-9040/70145638/

I've only run across a need for that tool a couple of times and borrowed one, never owned one myself.

 

[GerryN]

If you have a spare motor, hook it up to the old starter and note the direction. Then connect it to the inverter to check what you need to do.

 

[JTCat]

Dual winding gets a bit tricky.

The answer is, you might have to change rotation by swapping leads on the input of the VFD instead of the output. It seems counterintuitive, but it's the nature of a dual-winding.

 

[parky]

JTCAT, Changing inputs to a VFD does not change rotation, as the output of a VFD is fixed as T1, T2, T3 regardless of input.

 

[Ronnie Sullivan]

Seeing as keeping phase for phase is no guarantee of everything being the same as it was - or me not having a rotation meter, I shall inch it and watch the slight movement direction.

 

[JTCat]

JTCAT, Changing inputs to a VFD does not change rotation, as the output of a VFD is fixed as T1, T2, T3 regardless of input.

PARKY,
OP States he is using a Star Delta motor.
These are usually used in one manner with if using a VFD -
SOFT START / START DEVICE WYE - OFF - VFD DELTA RUN

If you want to change the STAR rotation you change the incoming phases because the incoming phase = the output phase of the soft start / start device.

You change the DELTA rotation at the output of the VSD, but this is common knowledge and I need no reminder.

 

[Saffa]

Hang on, you're not going to keep it as 6 wires out to the VFD surely? Add the links in the terminal box to make it delta and just take 3 core plus earth to the drive (should probably be upgrading to screened VFD cable anyway).

Phase rotation meter would definitely be useful here. Pretty sure most VFDs are clockwise rotation in forward run.

Luckily I only really do pumps and fans, very easy to bump test.

 

[parky]

If using a VFD then there is no need for all six wires to the VFD depending on the motor/power/voltage will depend on how it is re-wired (suggest motor end or on the outgoing terminals.) I.E. Start/Delta, the VFD acts like a soft start anyway.