21
Before making electrical input connections to the weld-
ing machine, “Machinery lockout procedures” must be
employed. If the connections are to be made from a line
disconnect switch, the switch must be padlocked in the
off position. If the connection is made from a fusebox,
remove the fuses from the box and padlock the cover
in the closed position. If locking facilities are not avail-
able, attach a red tag to the line disconnect switch (or
fuse box) to warn others that the circuit is being worked
on. If the plug-cap is used, (see 3.2B) remove plug from
receptacle.
3.2.1 Input electrical requirements
Models of this welding machine are designed to be oper-
ated from 208/230, or 208/230/380/400/460/575 volts single
phase 50/60 Hz, depending on model. The primary input
voltage requirements are shown on the welding machine
nameplate.
3.2.2 Input conductor connections
The input power cord on 208/230 Volts primary input model
is provided with an attachment plugcap. The plugcap will
mate with a standard 250 Volts, 50 Ampere receptacle
conforming to NEMA 6-50 R configuration.
The 208-575 volt primary input model must be wired to a
separately fused disconnect or circuit breaker of the size
listed in Table 3.1. This disconnect or breaker can be wired
to a single phase system or to two conductors of a three
phase system. A third conductor for grounding must also be
connected between the disconnect and the receptacle.
3.1 locatIon (figure 3.1)
Proper installation permits free air movement into and out
of the unit and minimizes exposure to dust, dirt, moisture,
and corrosive vapors. A minimum of 18 inches (46 cm)
unrestricted space must be maintained between the rear
panel and the nearest obstruction.
32.25"
19.50"
40.00"
CAUTION:
Do not place any filtering device over the
air intake passages of the unit. This would
restrict air intake and cause an overheating
condition and possible failure. Warranty is
void if any type of filtering device is used.
If a forklift vehicle is used for lifting the unit, be sure that
the lift forks are long enough to extend completely under
the base.
Do not operate the machine without the running gear
installed.
3.2 electrIcal Input connectIons
A line disconnect switch must be installed in the input circuit
to the welding machine. This is to provide a safe means to
completely remove all electrical power from the welding
machine whenever it is necessary to perform service on the
unit. (See Figure 3.2A.)
sectIon 3
InstallatIon
figure 3.1 Dimensions
recommended
full
primary
primary
load
Input
ground
Input
line
fuse
conductor conductor
Volts
amperes size
size
size
208
66
90
6
8
230
61
80
8
8
380
37
50
10
10
380 (50Hz)
38
50
10
10
400
36
50
10
10
400 (50Hz)
36
50
10
10
460
30
40
12
12
575
25
35
12
12
taBle 3.1 Input conductor and fuse size
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MODULE
Summary of Contents for Migmaster 275
Page 4: ...4 TABLE OF CONTENT ...
Page 20: ...20 section 2 INTRODUCTION ...
Page 28: ...28 section 3 INSTALLATION ...
Page 42: ...42 section 5 SERVICE ...
Page 46: ...46 section 6 REPLACEMENT PARTS ...
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