ESAB EPP-400 Manuel D'instructions page 303

section 6
notice
6.4.3 power shunt installation
caution
There are two cables that attach to the shunt pick-up points:
a two conductor cable drives the ammeter
a three conductor which provides the current feedback signal to PCB1 (control PCB).
Dressing of the 2 conductor cable is not critical.
The following is the dressing procedure for the 3 conductor cable.
• The breakout point should be physically at the middle of the shunt. The breakout point is the place
where the conductors exit from the outer insulation jacket.
• The black and clear insulated wires must be kept next to the shunt and under the cable ties.
• The wire terminals for the black and clear insulated wires should be oriented in parallel with bus bars
as shown.
some power sources may contain snubber resistors and capacitors
in a molded module similar in size and mounting to the free wheel-
ing diode modules. these snubber modules utilize two conductive
straps. one strap attaches to the free wheeling diode terminal #1
and the other to terminal #3. strap to #3 is sandwiched between the
free wheeling diode and the stamped copper bus. the strap to #1
is mounted on top of the copper bus under the mounting hardware
and in direct contact with the copper bus.
instability or oscillation in cutting current can be caused by im-
proper dressing of shunt pick-up leads.
poor torch consumable life will be the result.
Terminals parallel
to bus bars
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