ESAB Migmaster 275 Instruction Manual page 22

sectIon 3
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 must be connected
to a reliable ground and the two remaining wires must be
connected to the separately fused lines of the disconnect
or breaker as shown in Figures 3.2C and 3.2D.
3.2.3 prIMarY Voltage Input connectIon
All units leave the factory with the primary electrical input
connected for their highest voltage connection (e.g.: 230-
volt for the 208/230-volt units; and 575-volt for the "multi-
voltage" units).
only qualified personnel may make these changes. Make
certain the primary power has been disconnected and all
safety procedures have been followed before proceeding
with these instructions.
3.2.4a connectIng for 208 Vac Input
Fig. 3.3A shows the 230v and 208v connections for the
208/230 dual voltage model. Change over is made by remov-
ing the right side panel below the wire feed compartment
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).
figure 3.3a - primary reconnections at
switch for 208/230 Volt Models
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.
fig. 3.3B - position of alternate Voltage tap
22
InstallatIon