Author Topic: Connecting pmdx 407 through pmdx MD20-120 to VFD and pump  (Read 120 times)

beerus

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Connecting pmdx 407 through pmdx MD20-120 to VFD and pump
« on: March 11, 2017, 07:32:33 pm »
Hi. I have:
PMDX 424 with PMDX 407;
Huanyang VFD;
Standard 1.5HP 3PH motor spindle;
Small liquid cooling pump;
I bought a PMDX MD20-120 in hopes of using it to hook up to J2 on the PMDX 407 board and control the VFD and the cooling pump. I need a little help to wire the MD20 properly to the VFD and the pump. MD20 has the connectors marked 0; 1; 2; 4; 6 and 8; the VFD has the DCM (common) and the FOR (forward), and the pump has two regular power wires.
Would you please help me figure out proper wiring from the PMDX 407 on J2?
Thank you!

Steve Stallings

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Re: Connecting pmdx 407 through pmdx MD20-120 to VFD and pump
« Reply #1 on: March 14, 2017, 08:22:49 pm »
If you are expecting the VFD and the coolant pump to both respond
to the M3/M4/M5 command in G code, then this can be made to work.

If you expect to control the VFD and the pump independently, then
you have a problem.

The terminals of J2 on the PMDX-407 are capable of switching 120 VAC
to activate the coil of the MD20 relay. The coil terminals are 0 and 1 on
the MD20.

The MD20 has two sets of normally open contacts.

You can use terminals 2 and 4 to connect to the DCM and FOR of the
VFD and use terminals 6 and 8 to switch the power to the pump.
Be careful because accidentally connecting AC mains power to the
VFD control terminals will kill it.
Steve Stallings
www.PMDX.com

beerus

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Re: Connecting pmdx 407 through pmdx MD20-120 to VFD and pump
« Reply #2 on: March 15, 2017, 02:07:24 pm »
Thank (Спасибо)