Delta VFD Parameters and Wiring for Acorn < user resolved, vfd parameters>

[Justin2200]

Running an Acorn rev4 and retrofitting my PM940V mill (came with a Delta VFD-E to run the spindle).

I've pored over the forums for days trying to figure it out. As it sits right now, Acorn is successfully sending a signal to the VFD, and the VFD is adjusting the output frequency based on what it is receiving from Acorn, however, the spindle is not turning.

I tested the spindle with just the VFD keypad control and it runs fine that way. So I modified the parameters for Master Frequency Command to +10V from AVI (Which is where the 10V lead from Acorn is plugged in. I also modified First Operation Command parameter to 1 (External Terminals, keypad enabled).

Everything else is working. I'm just trying to get this spindle going. The VFD is receiving the signal and modifying the frequency but apparently is not getting a start command. I've got the VFD configured for 2 wire operation where MI1 is Forward/Stop and MI2 is Rev/Stop. MI3 is Reset. DCM is going to the common on the relay board. I've tried wiring the relay board per S15008 and per S14826 with no change. Wizard is configured properly for the motor I'm trying to run.

I do not have E-stop wired into the Spindle circuitry. My E-stop is wired to the Acorn board only
Photos:

VFD Manual: https://deltaacdrives.com/wp-content/up ... Manual.pdf

If you need more info let me know.

[centroidsupport]

To be clear, DCM does not go to COM on H10 on the Acorn. It goes to the "commons" for the outputs you are using for forward reverse. Which outputs/relays on the relay board is DCM wired to?

NOTE: The "common" on a relay is simply the voltage to be switched. It could be COM but it is often +5VD, +12VDC, -12VDC, +24VDC or even 110VAC. It is NOT the same as COM.

In your case, it is not COM but DCM

[Justin2200]

To be clear, DCM does not go to COM on H10 on the Acorn. It goes to the "commons" for the outputs you are using for forward reverse. Which outputs/relays on the relay board. Which relays is DCM wired to?

NOTE: The "common" on a relay is simply the voltage to be switched. It could be COM but it is often +5VD, +12VDC, -12VDC, +24VDC or even 110VAC. It is NOT the same as COM.

In your case, it is not COM but DCM

DCM is currently wired to Relay 6 center connector, next to the Reset. Forward is on Relay 4 and Reverse is on Relay 5, per Schematic 14826, but that is a rev3 schematic. Rev4 schematic shows both forward and reverse on Relay 5. Should I set it up that way with DCM to Relay 5 between them?

[cncsnw]

Do you also have DCM jumpered to the center (common) terminals of your OUT4 and OUT5 relays?

The relay board has no internal connection between the commons of the different relays. They are all independent of each other.

[Justin2200]

Do you also have DCM jumpered to the center (common) terminals of your OUT4 and OUT5 relays?

The relay board has no internal connection between the commons of the different relays. They are all independent of each other.

I'm thinking that may be the problem, I didn't have DCM jumped to the relays with the fwd/rev. Are those dynamic and configurable in wizard, or is it always going to be the same relays which control the VFD direction? I've seen some schematics where both are on the same relay with a com in the center, and others where each direction has its own relay.

[centroidsupport]

Please wire it per 15008r2. I'm not sure why there is a difference, but the wiring method in 15008 insures that only FWD or REV can be commanded at anytime. The wiring used in 14826 could allow both to be commanded at the same time. The PLC should prevent this but it could but the wiring in 15008 offers a physical failsafe. OUT 4 is really a "spindle enable" while OUT 5 uses the NO and NC contacts to insure it's physically impossible to command both at once.

FWIW DCM also needs to be wired to DCM if you wish to use it.

[Justin2200]

Please wire it per 15008r2. I'm not sure why there is a difference, but the wiring method in 15008 insures that only FWD or REV can be commanded at anytime. The wiring used in 14826 could allow both to be commanded at the same time. The PLC should prevent this but it could but the wiring in 15008 offers a physical failsafe. OUT 4 is really a "spindle enable" while OUT 5 uses the NO and NC contacts to insure it's physically impossible to command both at once.

FWIW DCM also needs to be wired to DCM if you wish to use it.

15008r2 is the schematic that I had initially used for wiring the VFD. Perhaps I didn't have my relay outputs configured properly in the wizard?

[centroidsupport]

Certainly possible. As Marc pointed out, that jumper is critical. The spindle won't run without it.

However, if you did correctly follow 15008r2 then it's either that the outputs weren't configured correctly in the Wizard or the inputs were not configured correctly in the VFD parameters.

Which outputs light up on the relay board when you command FWD or REV?

[centroidsupport]

FWIW When following the wiring in 15008r2 , the Wizard settings should be OUT4 = VFDEnable and OUT5 = VFDDirection.

[Justin2200]

FWIW When following the wiring in 15008r2 , the Wizard settings should be OUT4 = VFDEnable and OUT5 = VFDDirection.

I had my software parameters setup wrong for the output. It's working now. Thank you for your help