Lincoln Electric SVM145-B service manual Machine Grounding

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INSTALLATION

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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,

or

b) be double insulated.

The Commander 300 has two 15 Amp-120VAC (5- 15R) duplex receptacles with GFCI protection and one

50Amp-120/240 VAC (14-50R) receptacle. The 120/240 VAC receptacle can be split for single-phase

120VAC 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

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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. The U.S. National 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.

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.

COMMANDER 300