Machine Grounding; Auxiliary Power Receptacles; Standby Power Connections; Commander - Lincoln Electric COMMANDER SVM145-B Service Manual

A-8

MACHINE GROUNDING

Because this portable engine-driven welder creates its
own power, you do not need to connect the machine
frame to an earth ground, unless the machine is con-
nected to premises wiring (home, shop, etc.).
To prevent dangerous electric shock, other equipment
powered by the Commander 300 must:
a) be grounded to the frame of the welder using a
grounded type plug,
b) be double insulated.
When the Commander 300 is mounted to a truck or
trailer, its frame must be securely connected to the
metal frame of the vehicle. When connected to premis-
es wiring such as a home or shop, its frame must be
connected to the system earth ground. See further
connection instructions in the section titled Standby
Power Connections as well as the article on grounding
the latest U.S. National Electrical Code and the local
code.
In general, if the machine is to be grounded, it should
be connected with a #8 AWG or larger copper wire to a
solid earth ground such as a metal water pipe going
into the ground for at least ten feet and having no insu-
lated joints, or to the metal framework of a building that
has been effectively grounded.
Electrical Code lists a number of alternate means of
grounding electrical equipment. A machine grounding
stud marked with the symbol is provided on the front
of the welder.

AUXILIARY POWER RECEPTACLES

The auxiliary power capacity of the Commander 300 is
10,000 watts of 60 Hz, single phase power. The auxil-
iary power capacity rating in watts is equivalent to volt-
amperes at unity power factor. The maximum permis-
sible current of the 240 VAC output is 44 A. The 240
VAC output can be split to provide two separate 120
VAC outputs with a maximum permissible current of
44A per output to two separate 120 VAC branch cir-
cuits. The output voltage is within ±10% at all loads up
to rated capacity.
NOTE: The 120/240V receptacle has two 120V outlets
of different phases and cannot be paralleled.
INSTALLATION
or
The U.S. National

COMMANDER 300

The Commander 300 has two 15 Amp-120VAC (5-
15R) duplex receptacles with GFCI protection and one
50 Amp-120/240 VAC (14-50R) receptacle.
120/240 VAC receptacle can be split for single-phase
120 VAC operation. The auxiliary power receptacles
should only be used with three-wire, grounded type
plugs or approved double-insulated tools with two-wire
plugs. The current rating of any plug used with the sys-
tem must be at least equal to the current capacity of the
associated receptacle.

STANDBY POWER CONNECTIONS

The Commander 300 is suitable for temporary, stand-
by or emergency power using the engine manufactur-
er's recommended maintenance schedule.
The Commander 300 can be permanently installed as
a standby power unit for 240 volt, three-wire, 44 amp
service. Connections must be made by a licensed
electrician who can determine how the 120/240 VAC
power can be adapted to the particular installation and
comply with all applicable electrical codes. The follow-
ing information can be used as a guide by the electri-
cian for most applications. Refer to the connection dia-
gram shown in Figure A.2.
1. Install the double-pole, double-throw switch between
the power company meter and the premises discon-
nect.
Switch rating must be the same as or greater than the
customer's premises disconnect and service over cur-
rent protection.
2. Take necessary steps to assure the load is limited to
the capacity of the Commander 300 by installing a
45 amp, 240 VAC double-pole circuit breaker.
Maximum rated load for each leg of the 240 VAC
auxiliary is 45 amperes. Loading above the rated
output will reduce output voltage below the allow-
able ±10% of rated voltage, which may damage
appliances or other motor-driven equipment and
may result in overheating of the Commander 300
engine.
3. Install a 50 amp 120/240 VAC plug (NEMA Type 14-
50) to the double-pole circuit breaker using No. 6, 4-
conductor cable of the desired length. (The 50 amp,
120/240 VAC plug is available in the optional K802R
plug kit.)
4. Plug this cable into the 50 Amp 120/240 Volt recep-
tacle on the Commander 300 case front.
A-8
The