Table of Contents
Advertisement
B-4
TRANSPORTING AND STORAGE
OF THE MULTI-WELD 350
CABLE HANDLING
The input and electrode cables are easily disconnect-
ed from the quick-connect "pig-tails", and the Work
lead can be reeled around the Multi-Weld 350 case
cradled by the base skid handles, to which the clip
can be secured.
TRANSPORTING
The Converter may be carried by one or two persons
using the front and rear top and bottom handles. It can
also be set vertically on a two wheel cart, or horizon-
tally on a wagon, to convey it longer distances.
STORAGE
The Multi-Weld 350 may be set on a floor, or shelf,
horizontally on its skid, or vertically standing on its
rear top and bottom handles.
PROTECTION FEATURES
The Multi-Weld 350 design features electronic protec-
tion systems to help assure reliable operation even
under adverse conditions. These systems include:
FAN AS NEEDED (F.A.N.)
The cooling fan will turn on when the arc starts and
remain on for about a minute after the arc is out to
cool down the power components.
This feature electronically controls the fan so it does
not run continuously when the power switch is turned
on. This will minimize the amount of contaminate and
clogging debris which may be drawn into the
Converter, in addition to the "Central-Air" system
design which intakes lower velocity air through the
higher side louvers and blows out through the lower
back louvers with higher velocity.
OVER-VOLTAGE PROTECTION
Average Input Voltage Protection
The Multi-Weld 350 input contactor will open if the
average input supply voltage is above 113VDC, and
will automatically reclose if the voltage drops back
below. During Over-Voltage Shutdown the panel dis-
plays will be as appropriate for the non-welding mode.
(See FRONT PANEL CONTROLS in this section).
CAUTION
When the contactor recloses the output of the
Converter will reactivate. Switching OFF input
power prevents unexpected reactivation.
------------------------------------------------------------------------
OPERATION
Peak Input Voltage Protection
The Chopper PC Board will stop switching and inter-
rupt the machine output whenever the input voltage
across the input capacitors exceeds their 150 volt rat-
ing. The Thermal Shutdown (yellow) panel light will be
lit when this protection is activated (Refer to OVER-
TEMPERATURE SHUTDOWN Section), and resets
when the voltage level drops below the protection
level. The input contactor also opens during this shut
down, until reset.
These features protects internal components of the
Converter from excessive voltage levels.
OVER-CURRENT PROTECTION
The max. output current of the Multi-Weld 350 is elec-
tronically limited, to protect internal power compo-
nents, so as not to exceed about 375 amps average
and 500 amps peak. When the current load starts to
exceed these limits the output is reduced (lower volt-
age) to sustain these max. levels, until the current is
reduced. even to a shorted output.
Prolonged output at this max. current limit level may
eventually overheat the Converterʼs internal power
components causing over-temperature shutdown.
(See following section).
Short circuit protection is also provided to reduce max.
output current to about 200 amps if the output voltage
is reduced, by loading or current limiting (see above),
to below 14 volts for over 7 seconds (indicating a
shorted output). The output current must be interrupt-
ed to reset this reduced protective level.
MULTI-WELD 350
B-4
Advertisement
Table of Contents
