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Jim Stewart Jim Stewart is offline
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Default Miller Syncrowave 250DX welder Amperage problem

Ignoramus14593 wrote:
I think that this is a simple problem.

Get a manual for the RFCS-14 pedal.

Find out which three contacts are for the potentiometer common,
ground, and wiper. Measure resistance between two ends, and then
between one and wiper as you engage the pedal.

The latter should change from zero to the first value.

if it does not, you probably found your problem.


He swapped in a known good pedal and the problem
didn't go away, so it's not the pedal or pedal
cable. Sounds like something is blown in the
box itself.




On 2008-07-02, RAM³ wrote:
Eug wrote in news:ab55214a-269e-4a81-b3b8-
:

This machine is a 2004 model used for tig with a water cooled torch
and foot pedal remote control. The problem started when the remote
cable was damaged causing the machine to give an error code 12. The
foot pedal cable was repaired and the machine now starts up normally.
Now I can strike an arc but cannot get the machine to go over 56 amps.
The foot pedal appears to control the amperage but maxes out at 56,
even with the front panel amperage control set to max. The amperage
indicator reads up to 310 amps when idling but while welding, never
goes over 56.
To try and isolate the problem, I switched to “panel” control of
amperage and in this condition full amperage is delivered. Since we
have other machines in the shop, I swapped in another pedal resulting
in the same problem. (And the first pedal works fine on the other
machine.)
My guess is only two things remain, either the wiring from the plug to
the mother board or the motherboard itself.
I am hoping someone can suggest other tests or possibilities
Thanks!
Eug

Two suggestions:

1. Re-post this on the sci.engr.joining.welding NG.

2. If you don't have the manuals - especially the wiring diagrams - for
this unit, go to the Miller website and download them..

Of course, you COULD just place a call to your Miller Dealer/Distributor
and see what they have to say...