Fan-As-Needed (F.a.n.); Thermostatic Protection; Routine And Periodic Maintenance; No Arc Protection - Lincoln Electric ASPECT 375 Operator's Manual

ASPECT™ 375
SAFETY PRECAUTIONS
WARNING
ELECTRIC SHOCK can kill.
• Only qualified personnel should
perform this maintenance.
• Turn the input power OFF at the
disconnect switch or fuse box
before working on this
equipment.
• Do not touch electrically hot
parts.
WARNING
To avoid receiving a high frequency shock, keep the TIG
torch and cables in good condition.

ROUTINE AND PERIODIC MAINTENANCE

Very little routine maintenance is necessary to keep your
ASPECT™ 375 running in top condition. No specific schedule
can be set for performing the following items; factors such as
hours of usage and machine environment should be considered
when establishing a maintenance schedule.
• Periodically blow out dust and dirt which may accumulate
within the welder using an air stream.
• Inspect welder output and control cables for fraying, cuts, and
bare spots.
• The fan motor has sealed ball bearings which require no
maintenance.
OVERLOAD PROTECTION

FAN-AS-NEEDED (F.A.N.)

The ASPECT™ 375 has the F.A.N. circuit feature, which means the
cooling fan will operate only as needed to assure proper machine
cooling. This helps reduce the amount of dust and dirt drawn into
the machine with the cooling air. The cooling fan will operate at
lower speeds when the machine power is initially turned on or at
idle, and continuously while the yellow Thermal Shutdown Light is lit
(see Thermostatic Protection).

THERMOSTATIC PROTECTION

This welder has thermostatic protection from excessive duty cycles,
overloads, loss of cooling, and excessive ambient temperatures.
When the welder is subjected to an overload, or inadequate cooling,
the primary coil thermostat and/or secondary coil thermostat will
open. This condition will be indicated by the illumination of the
yellow Thermal Shutdown Light on the front panel (see Item 2 in
Figure B.24 Operation Section). The fan will continue to run to cool
the power source. Postflow occurs when TIG welding is shut down,
but no welding is possible until the machine is allowed to cool and
the yellow Thermal Shutdown Light goes out.

NO ARC PROTECTION

The machine outputs (Background / OCV, gas and HF)
will be shutdown, if the trigger is closed without welding for 15
seconds to protect the Background resistor from overheating with
F.A.N. cooling off, as well as to conserve on gas waste.
AUXILIARY POWER CIRCUIT BREAKER
This machine includes a 10 amp circuit breaker, located on the
opposite side of the upper case back, for protection of the 115 Vac
receptacle.
D-1
MAINTENANCE