Voltage Reducing Device; Dynamic Power Adjustment; Synchronous Welding (Ac) - EWM T5.00-AC/DC Comfort 3.0 Operating Instructions Manual

Functional characteristics

Voltage reducing device

5.7 Voltage reducing device
The voltage reduction device (VRD) is used to increase safety, especially in dangerous environments
(such as shipbuilding, pipeline construction, mining).
The use of a voltage reduction device is mandatory in some countries and specified in many in-house
safety regulations for welding power sources.
The VRD > see 4.1.2 chapter signal light lights up when the voltage reducing device is working properly
and the output voltage has been reduced to the values specified in the relevant standard (technical data).
5.8

Dynamic power adjustment

This requires use of the appropriate mains fuse.
Observe mains fuse specification!
This function enables aligning the machine to the mains connection fusing. This may counteract frequent
tripping of the mains fuse. The maximum input power of the machine is limited with an exemplary value
for the existing mains fuse (infinitely variable).
You can predefine this value in the machine configuration menu > see 5.10 chapter using parameter
The function automatically adjusts the welding power to an uncritical level for the corresponding mains
fuse.
When using a 25-A mains fuse, a suitable mains plug has to be installed by a qualified electri-
cian.
5.9

Synchronous welding (AC)

This function is important when welding with two power sources on both sides, simultaneously with alter-
nating current, as is the case, for example, with thick aluminium materials in position PF. This ensures
that with alternating current, the positive and negative pole phases occur simultaneously on both power
sources (are synchronised) and the arcs, therefore, do not affect one another.
The phase sequences and rotating fields of the supply voltages (50Hz / 60Hz) must be identical to ensure
that the energy is introduced into the weld pool interference-free during synchronous welding. The requi-
red parameters can be set directly on the machine control (no turning or reconnecting of the mains
connection plugs is required). Wiring differences in the supply network are also compensated. Optimum
phase compensation immediately shows better welding results.
The Expert menu (TIG) > see 5.1.15 chapter is used to activate and set the device function "Synchronisa-
tion via mains voltage". The parameter
Two EWM power sources can be synchronised using the phase shift
60°, 120°, 180°, 240° and 300°).
When synchronising with a third-party product (power source), the parameter Phase fine-tuning
be adjusted in steps of 1° (-30° to 0° to +30°) in addition to the phase position.
62
Figure 5-53
must be set to (signal light Netsync lights up).
parameter in steps of 60° (0°,
099-00T500-EW501
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can