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Winston Winston is offline
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Default Miller Syncrowave 250DX welder Amperage problem

Eug wrote:
I whish to thank everyone who answered


(...)
Hi Eug,

I would like to know if there is an issue with the 10 VDC *going
to* the 'Remote 14 Receptacle' or *coming back into* the 'Remote
14 Receptacle'. Please see diagram 3-8 the top of page 14.

http://www.millerwelds.com/om/o363w_mil.pdf

Can you temporarily clip a DC voltmeter on the circuit board:
1) First, between return (Same as Pin D) and 'Output to remote control' (Same as Pin C)
2) Second, between return (Same as Pin D) and '0 to +10 volts dc input command
signal from remote control.' (Same as Pin E)

In 'Remote' mode you should see a constant 10 V on the first meter position and on
the second meter position you should see a voltage that varies from nearly 0 V to 10 V
as you press on the remote amperage control pedal.

It sounds as if you get not much more than 1.81 V *to* the pedal if the
problem is on the 'left' side of the pedal (signal going into the pedal)
*as Jon Elson said.*

Alternatively you should look on the 'right' side of the pedal (signal
processed by the circuit board) if you see that the pedal gets its 10 V
reference and outputs 0-10 V as outlined above.

Divide By Two, and Conquer! (Phil Gold, 1982)

--Winston