ESAB MIGMASTER 250, Instruction Manual

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16
Figure 3.2 - Primary Connection
208/230 MODEL ONLY (With Plug-Cap)
208/230/380/400/460/575-V. MODELS
SINGLE-PHASE
THREE-PHASE
SINGLE-PHASE
THREE-PHASE
GRD
GRD
GREEN
CONDUCTOR
(GROUND)
GREEN
Fused
Line
Disconnect
Switch,
or
Circuit Breaker
Wall Receptacle
MIGMASTER
SYSTEM
CONNECTS HERE
Figure 3.2 A Figure 3.2 B
Figure 3.2 D Figure 3.2 C
TABLE 3.1 Input Conductor and Fuse Size
Recommended
Full Primary
Primary Load Input Ground
Input Line Fuse Conductor Conductor
Volts Amperes Size Size Size
208 71 90 8 8
230 62 90 8 8
380 37 50 10 10
400 36 50 10 10
460 31 40 12 12
575 25 30 12 12
Fig. 3.3A shows the 230v and 208v connections for the
208/230 dual voltage model. Change over is made by
removing the right side panel below the wire feed compart-
ment and switching the primary transformer tap at the top
of the power switch with the unused alternate voltage tap
located next to the main transformer (see Fig. 3.3B). Both
voltage taps (the one currently connected to the switch
and the unused alternate voltage) are marked with the
input voltage requirement. All units are supplied from the
factory connected for the highest voltage (230 vac). Before
switching the voltage taps, verify the actual voltage
requirement as well as the current voltage connection to
be certain re-connection is necessary. If voltage tap re-
connection is necessary, the following paragraphs cover
the procedure to switch the voltage tap for either 208vac
or 230vac input.
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 250 Volts, 50 Ampere receptacle
conforming to NEMA 6-50 R configuration.
The receptacle should 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 should also be connected
between the disconnect and the receptacle.
Figure 3.2A illustrates wiring to a single phase system
and Figure 3.2B illustrates wiring to a three phase
system.
The 208/230/380/400/460/575 primary input voltage unit
is provided with a three conductor primary input cable
without plugcap. The ground lead of this cable should be
connected to a reliable ground and the two remaining
wires should be connected to the separately fused lines
of the disconnect or breaker as shown in Figures 3.2C
and 3.2D.
All machines leave the factory with their primary electri-
cal input requirements internally-connected for the high-
est voltage rating available in each model (e.g.: 230-volt
for the 208/230-volt units; and 575-volt for the "multi-
voltage" units).
Only qualified personnel should make these changes.
Make certain the primary power has been discon-
nected and all safety procedures have been followed
before proceeding with these instructions.
GRD
GRD
SECTION 3 INSTALLATION