Lincoln Electric IM664 Multi-Weld 350 Arc Converter - Manual (Page 12)

A-5 INSTALLATION
MULTI-WELD 350
A-5
ELECTRIC SHOCK can kill.
Be sure to follow the safety practice to
use the female connector on the cable
which would normally be electrically
"hot" (supply lead) if disconnected when
the system is energized, and the male on
the normally "cold" (load lead) side. If practical, shut
off power before connecting or disconnecting termi-
nals.
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WORK CONNECTION
Each Converter in the Multi-Weld System must have its
individual “Work” lead connected (clipped) to work. The
#3 AWG (27mm
2 ) Work clip lead must have clean metal
connection to the work to complete the DC input supply
and output power circuits of the Multi-Weld 350.
ELECTRIC SHOCK can kill.
Do not disconnect the Work clip lead
without first switching OFF the
Converter panel switch. Failure to do
so will allow the work lead clip to be
electrically "hot" to work, and "hot" to
the electrode, through the circuit of the Converter
for about 5 seconds until the input contactor
opens.
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CASE GROUNDING
As shipped, the case of the Multi-Weld 350 is isolated
from all of the DC input and output welding terminals,
and is equipped with a grounding terminal screw (.31”
/ 7.9mm) marked with the symbol located on the
bottom rear of the Base assembly. ( Refer to the bot-
tom view figure.) In order to comply with CSA and UL
case grounding specifications, this terminal is provid-
ed for connection to weldment work which must be
properly grounded per methods meeting local and
national electrical codes. Refer to “Safety in Welding,
Cutting and Allied Processes”, ANSI Z49.1 (US) and
W117.2 (Canada).
Since any case fault would only involve the DC weld-
ing circuit, the size of the grounding lead should have
the capacity to ground the potential fault current with-
out burning open. Use at least #6AWG (13mm
2 ), but
do not exceed the size of the input cable suppled with
the Multi-Weld 350.
Connect the Multi-Weld grounding lead to the work
piece separately from the Work clip. If the same clip is
used for both ground and work connection, the Multi-
Weld case will be electrically “hot” to the work if the
clip is removed without first switching OFF the panel
switch. ( Refer to the Work clip WARNING above).
WARNING
WARNING