Lincoln Pro-Cut 55 vs VIM voltage limit

LS-THC (Torch Height Control) Plasma Cutter Wiring (Raw and Divided)
1

The Langmuir plasma cutter compatibility page lists the Lincoln Electric Procut 55 as compatible, but the requirement is just that it doesn’t use high-frequency start. But what about THC VIM input compatibility?

Per the VIM section of the THC guide:

MAXIMUM INPUT VOLTAGE FOR THE VIM MODULE IS 300V. DO NOT EXCEED THIS INPUT VOLTAGE!

From the Procut 55 manual, “Output → Open Circuit Voltage: Max 335 VDC”.

I don’t think the Procut has a voltage divider built in, so I would need to use the raw plasma voltage inputs to the VIM. However, 335 VDC exceeds the VIM’s max input of 300V, which is in all caps.

I’m interested in info for any of the following:

  • Am I reading things correctly, and the Pro-cut 55 is (on paper) a threat to the VIM?
  • Is there a 50:1 divider for the Procut series I don’t know about, or can I make one?
  • Is there a way to limit the max DC output of the Pro-cut 55 under 300V?

Thanks for your time!

2

It’s not likely that you will ever reach 300 volts while cutting anything that the table can support.

Something would have to go very wrong to put out over 300 volts while cutting.

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