Internal Connections; External Connections - Elettro 293 Manual De Instrucciones

2.2 INTERNAL CONNECTIONS

• Any intervention carried out inside the welding
machine must be performed by qualified personnel.
• Before working inside the welding machine, make
sure that the plug is disconnected from the power
mains.
• After final inspection, the welding machine is
connected to the voltage indicated on the power
supply cable.
• To change the supply voltage, remove the right side
panel and arrange the voltage change terminal board
connections as shown in the picture.
• The supply voltage may not be changed on single-
phase power sources.
• Do not use the welding machine without its cover or side
panels for obvious safety reasons, and to avoid altering the
cooling conditions for internal components.
• Connect a plug suitable for the absorbed current to the
power supply cable.
• Connect the yellow-green wire of the machine mains to an
efficient grounding socket.

2.3 EXTERNAL CONNECTIONS

2.3.1 Connecting the mass clip.
• Connect the earth cable terminal to the socket of the
welding machine, and connect the earth clamp to the
workpiece.
2.3.2 Cylinder placement and connecting the gas hose
• Position the cylinder on the cylinder holder of the welding
machine, using the chains provided to fasten it to the top
panel of the machine.
• The gas cylinder must not be higher than 1,65m
(items 293-294) and 1m (item 291), to avoid creating
hazardous conditions.
• Periodically check for wear on the chains, and order
replacements if necessary.
• The cylinder must be equipped with a pressure regulator
complete with flow gauge.
• Only after positioning the cylinder, connect the outgoing
gas hose from the rear panel of the machine to the
pressure regulator.
• Adjust the gas flow to approximately 10/12 litres/minute.
3 DESCRIPTION OF CONTROLS (pict. 2)
3.1 CONTROLS ON THE FRONT OF THE MACHINE
A - Green LED
Signals that the display L shows the
program number being used.
Check the instructions posted inside the mobile side panel
for the diameter, wire type and gas corresponding to the
program number displayed. The value on the display L is
always preceded by the letter P.
B - Green LED.
Signals that the display L shows the spot
welding or working time. The length of this
time is adjustable from 0.3 to 5 seconds. Setting the time to
0 disables the function. The function is active only while
welding.
The value shown on the display L is always preceded by
the letter T.
C - Green LED.
Signals that the display L shows the pause
time between welding segments. The length of
this time is adjustable from 0.3 to 5 seconds. Setting the
time to 0 disables the function. The function is active only if
the welding time is not 0 and while welding. The value
shown on the display L is always preceded by the letter T.
D - Green LED (Burn-Back).
Signals that the display L shows the time for
which the wire exits the welding torch, after
the operator has released the torch trigger.
This time ranges from 10 to 400 milliseconds. The value
shown on the display L is always preceded by the letter T.
E - Selection key.
Pressing this key causes the LEDs A, B, C, D to
light in sequence.
From within the sub-menu activated by the 2 keys M - N,
select the Soft Start, P3KP motor speed variation, and post
gas functions.
F - 10-pin connector.
This connector must be connected to the 10-pin
patch connector of the P3KP torch or SPOOL-
GUN.
G - Yellow LED.
Lights when the thermostat interrupts the
welding machine operation.
H - Green LED.
Lights and shuts off intermittently when the
connector of the P3KP torch or SPOOL-GUN
is connected to the connector F.
I - Selector switch.
Turns the machine on or off and selects the
welding voltage ranges.
J - Central adapter.
This is where the welding torch is to be
connected.
K - Earth sockets.
Sockets to which to connect the earth cable.
(Some versions have a single earth socket).
L- Display. Using the manual program 00 the instrument
displays the wire speed in meters per minute
before welding, and the current while welding.
Using the synergic programs it always displays the current.
As described in the paragraphs above, the following may
be displayed on the instrument before beginning to weld:
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