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II. INTRODUCTION
2.1 GENERAL
This manual has been prepared especially for use in
familiarizing personnel with the design, installation, op-
eration, maintenance, and troubleshooting of this equip-
ment. All information presented here in should be given
careful consideration to assure optimum performance of
this equipment.
2.2 RECEIVING-HANDLING
Prior to installing this equipment, clean all packing mate-
rial from around the unit and carefully inspect for any
damage that may have occurred during shipment. Any
claims for loss or damage that may have occurred in
transit must be filed by the purchaser with the carrier. A
copy of the bill of lading and freight bill will be furnished
by the carrier on request if occasion to file claim arises.
When requesting information concerning this equipment,
it is essential that Part, Serial and Model Numbers of the
equipment be supplied.
2.3 DESCRIPTION
The Migmaster 250 is a portable Welding System de-
signed for fine wire, (0.023, 0.030, 0.035 and 0.045 in.)
welding using the short arc method, as well as for spray
arc aluminum, short arc and spray arc stainless steel and
spray arc cored wires. It incorporates a running gear with
provisions for one gas cylinder, and a ST-23A spool-on-
gun control.
2.3.1 AVAILABLE PACKAGES AND CONTENTS
The following Migmaster 250 "Consisting of" Packages
are available:
MM-250 for 208/230-V. Input w/12-ft. Kit . P/N 604560
MM-250 for 208/230-V. Input w/15-ft. Kit . P/N 604561
MM-250 for 208/230/380/400/460/575-V. Input w/12-ft. Kit
.............................................................. P/N 604563
MM-250 for 208/230/380/400/460/575-V. Input w/15-ft. Kit
.............................................................. P/N 604570
Depending on the "primary input voltage" of the MM-250,
and the "torch length", each package includes the follow-
ing:
l One (1), Migmaster 250 Power Supply/Wire Feeder
equipped with a dual-groove feed roll (for .035/.045 wire),
a 6'-0" ft. primary input power cable and plug (plug is
installed for 208/230-V. units only), an input power recep-
tacle rated @ 50A./250-V. (packed loose for 208/230-V.
input packages only), 10-ft. work cable w/clamp, a 6'-0"
shielding gas supply hose w/fittings and running gear w/
gas (cylinder) support, as follows:
-- Migmaster 250 for 208/230-Volt input .... P/N 32851
-- Migmaster 250 for 208/230/380/400/460/575-Volt
input ....................................................... P/N 32852
l One (1), Migmaster 250 Kit as follows:
-- 12-ft. Kit ................................................. P/N 32993
Includes:
MT-200cc, ready-to-weld, 12-ft. lg. torch
for .035/.045 wire ....................................... P/N 21116
R-33-FM-580 Regulator, (F-15-173) ........... P/N 21557
Mig Welding Process Handbook .............. P/N 791F18
-- 15-ft. Kit ................................................. P/N 32994
Includes same accessories as 12-ft. Kit except for torch,
which is:
MT-200cc, 15-ft. lg. for .035/.045 wire, ....... P/N 21117
2.3.2 POWER SUPPLY
The power supply consists of a tapped single phase
transformer, tap selection switches, secondary contactor,
single phase full wave rectifier, stabilizing reactor, slope
resistor, filtering capacitors and internal output connec-
tions for polarity reversal.
2.3.3 WIRE FEEDER
The wire feeder pushes 0.023, 0.030, 0.035 and 0.045 in.
wire at speeds up to 650 IPM. Dynamic braking prevents
excessive wire overrun. A double grooved drive roll
(0.035 and 0.045 in.) provides a convenient means of
changing the setup for either wire size.
The wire feeder is built into the power supply cabinet, and
is housed in a compartment separated from the welding
machine components. Machine ventilation is not drawn
through this compartment, thus helping to keep the wire
and feeding mechanism clean.
6
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