Lincoln Electric IM481-B VAC Auxiliary Power for Water Cooler, Machine and Circuit Protection

220 VAC AUXILIARY POWER FOR WATER COOLER

A Continental European receptacle (220V Schuko type) is located on the rear panel for supplying 220VAC to a water cooler. A 2 amp circuit breaker which is also located on the rear panel protects this circuit from excessive overloads or short circuits.

MACHINE AND CIRCUIT PROTECTION

The power source is thermostatically protected with proximity thermostats against overload or insufficient cooling. One thermostat is located on the nose of the center bottom primary coil and a second thermostat is attached to the lead connecting the secondaries. Both thermostats are connected in series with 2-4 circuit. If the machine is overloaded, the primary thermostat will open, the output will be zero, the amber thermal pro- tection light will be on and the fan will continue to run. The secondary thermostat will open either with an excessive overload or insufficient cooling. The output will be zero, the amber protection light will be on and the fan will continue to run. When the thermostats reset the protection light will be off.

The power source is also protected against overloads on the SCR bridge assembly through the solid state fault protection circuit. This circuit senses an overload on the power source and limits the output to approxi- mately 550 amps by phasing back the SCR’s.

Protection is provided to protect the circuitry from accidental grounds. If leads 75, 76, or 77 are acciden- tally “grounded” to the positive output lead, the output will be reduced to a low value, thus preventing any damage to the machine. If the ground occurs between 75, 76, 77 and the negative output lead, one of the PC board electronic “self-restoring” fuses will blow, pre- venting any machine damage. After the ground is cleared, the fuses automatically reset within a few seconds.

MAINTENANCE

WARNING

ELECTRIC SHOCK can kill.

•Have an electrician install and service this equipment.

•Turn the input power off at the fuse box before working on equipment.

•Do not touch electrically hot parts.

---------------------------------------------------------------------

Routine Maintenance

1.The fan motor has sealed bearings which require no service.

2.In extremely dusty locations, dirt may clog the air channels causing the welder to run hot. Blow out the machine at regular intervals.

3.In extremely dusty locations, dirt may accumulate on the remote control terminal strip. Wipe or blow this terminal strip off at regular intervals. This is particularly important in damp locations.

– 21 –