5 OPERATION
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abnormally or the power source is switched off in the normal manner, the welding data will be
stored, so it will be available next time the unit is turned on.
5.5
Fan control
The power source has a time circuit, which keeps the fans running for 6.5 minutes after
welding has stopped, then the unit switches to energy-saving mode. The fans start again
when welding begins. The fans run at reduced speed for welding currents up to 200 A, and at
full speed for higher currents.
5.6
Overheating protection
The welding power source has overheating protection circuit that operates if the internal
temperature becomes too high. When this occurs the welding current is blocked and a fault
code is displayed on the control panel. The overheating protection resets automatically when
the temperature has fallen.
5.7
Remote control unit
The remote control unit must be connected to the remote control unit socket on the power
source before activation. When the remote control unit is activated, the panel on the wire
feed unit is inactive.
5.8
VRD (Voltage Reducing Device)
The VRD function ensures that the open-circuit voltage does not exceed 35V when welding
is not being carried out. This is indicated by a lit VRD LED on the panel.
The VRD function is blocked when the system senses that welding has started.
If the VRD function is activated and the open-circuit voltage exceeds the 35V limit, this is
indicated by an error message (16) appearing in the display and welding cannot be started
whilst the error message is displayed.
5.9
MIG/MAG and FCAW-S welding
An arc melts a continuously supplied wire. The weld pool is protected by shielding gas. For
MIG/MAG and FCAW-S welding, the power source is supplemented with:
•
wire feed unit
•
welding torch
•
connection cable between power source and wire feed unit
•
shielding gas bottle
5.10
MMA welding
MMA welding may also be referred to as welding with coated electrodes. Striking the arc
melts the electrode and its coating forms protective slag.
For welding with coated electrodes, the power source is supplemented with:
•
welding cable with electrode clamp.
Summary of Contents for Mig 4004i
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