Thermal Arc C/W VFE 4C HS III, Operation Manual

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Approximate range of welding current Filter lens required for MIG
Up to 150 Shade 10
150-250 Shade 11
250-300 Shade 12
300-350 Shade 13
Over 350 Shade 14
2.08 User Responsibility
This equipment will perform as per the information contained herein when installed,
operated, maintained and repaired in accordance with the instructions provided. This
equipment must be checked periodically. Defective equipment (including welding
leads) should not be used. Parts that are broken, missing, plainly worn, distorted or
contaminated, should be replaced immediately. Should such repairs or replacements
become necessary, it is recommended that such repairs be carried out by
appropriately qualified persons approved by Thermal Arc. Advice in this regard can be
obtained by contacting Thermal Arc.
This equipment or any of its parts should not be altered from standard specification
without prior written approval of Thermal Arc. The purchaser of this equipment shall
have the sole responsibility for any malfunction which results from improper use or
unauthorized modification from standard specification, faulty maintenance, damage or
improper repair by anyone other than appropriately qualified persons approve by
Thermal Arc.
2.09 Duty Cycle
The rated duty cycle of a welding Power Supply is the operating time it may be used at
its rated output current without exceeding the temperature limits of the insulation of the
component parts. To explain the ten minute duty cycle period the following example is
used. Suppose a welding Power Supply is designed to operate at 50% duty cycle, 250
amperes at 28 volts. This means that it has been designed and built to provide the
rated amperage (250A) at the rated load voltage (28V), for 5.0 minutes out of every 10
minute period (50% of 10 minutes is 5.0 minutes). During the other 5.0 minutes of the
10 minute period the Power Supply must idle and be allowed to cool. The thermal cut
out will operate if the duty cycle is exceeded.
WARNING
ELECTRIC SHOCK can kill. DO NOT TOUCH live electrical parts. Disconnect input
power conductors from de-energized supply line before moving the welding power
source.
WARNING
FALLING EQUIPMENT can cause serious personal injury and equipment damage.
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