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WELDER INFORMATION (cont.)
VRD FUNCTION SELECTION
The voltage between the earth clamp and the electrode holder clamp may be dangerous for
the user. The VRD function prevents dangerous voltage value between clamps.
The needed voltage for welding is supplied only when the electrode makes contact with
the welding part. An acoustic buzzer advises the two phase’s transit. When the electrode is
removed from the welding part, the equipment returns to protective condition. When the
VRD device is on, the start of ARC may be dicult; therefore it is important to make contact
with the welding part to turn on the equipment and begin welding.
PROTECTION FROM OVERHEATING
The duty cycle is the fraction or percentage of a ten-minute cycle that a power source may
be used without overheating. For example, a welding machine with 150 amp - 30% duty
cycle can weld continuously at 150 amps for 3 minutes, and then must cool down during the
remaining 7 minutes to prevent overheating, with the ambient temperature of 40°C.
Using the machine with the proper duty cycle according to the selected current allows to
prevent overheating. In case of overheating of the machine the yellow LED (Fig 1, B) indicates
that the thermal protection is on, you can continue to use the machine when the LED is o.
MAINTENANCE
All maintenance and repairs must be carried out by an authorised repair agent. Any non-
authorised repairs will void warranty. Personnel in compliance to the norm (IEC 60974-4).
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