Fronius VARIOSTAR 357 Bedienungsanleitung & Ersatzteilliste Seite 26

Fig.6 Various setting dials inside the welding machine
Burn-back time correction dial ... where correctly adjusted, this
prevents the welding wire freezing to the weld puddle or the contact
tube
- Manual Mode ... Burn-back time can be continuously adjusted on
the scale from 0 - 0.4 sec.
- Program Mode ... Correction facility of +/- 0.2 sec. of the burn-back
time integrated in the welding program
Soft-start speed dial ... for setting a jerk-free ignition cycle when
working with solid and flux-cored wires from diam. 1.2 mm upwards
and/or at high wirefeed speeds
- Manual Mode ... The soft-start speed can be adjusted from 1.5 m/
min up to 100% of the pre-set wirefeed speed
- Program Mode ... The programmed soft-start speed can be corrected
by turning the dial clockwise or anti-ckockwise
Intermittent welding time / spot-welding time setting dial ... has a
different function depending on which operating mode the machine is
in
- Intermittent 2-step, intermittent 4-step mode ... for setting the
intermittent welding time t1 (recommended operating range: 0.1 -
1.5 sec.)
- Spot-welding... for setting the spot-welding time or arc burn time in
MIG/MAG spot welding (adjustment range: 0.2 - 4.0 sec.)
Intermittent pause time t2 dial ... active when the operating mode
selector switch is in the Intermittent 2-step or Intermittent 4-step
position (adjustment range: 0.1 - 0.8 sec.)
Gas pre-flow time t1 dial (adjustment range: 0 - 3.0 sec.)
Gas post-flow time t2 dial (adjustment range: 0 - 4.0 sec.)
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Fig.7 Fuses inside the welding machine
Fuse for fan
Fuse for wirefeeder motor, solenoid valve, contactor
Fuse for auxiliary transformer
Fuse for control system
Torch central connector ... for connecting the welding torch to the
machine
Welding-current sockets 1 / 2 / 3 ... for plugging the earthing cable
into. There are two inductance stages on the VST 357 / 357-2 (and
three on the VST 457 / 457-2) to enable the current rise to be
influenced at the instant of droplet transfer (thus optimising the
welding result).
- Socket 1 ... suitable for dip-transfer range under CO2 and mixed
gas (steep current rise)
- Socket 2 / 3 ... under mixed gas, suitable for the lower dip-transfer
range; otherwise, suitable for the intermediate or spray arc (shallow
current rise)
Torch control socket ... Plug the control plug from the torch into this
socket
Lead-through ... for connecting up water forward-flow and return-flow
leads to Dinse / Euroconnector type power sources
2-roller drive
Wire-spool holder ... for holding and securing standard welding-wire
spools weighing max. 20 kg
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