USE
WELDING DIGITAL CONTROL
M
33.
2
© MOSA
REV.1-01/08
TIG MODE
Contact starting TIG
This position is specifically for TIG welding. To cre-
ate the arc simply place the tip of the TIG electrode
on the piece that requires welding then gently move
the tip away. The arc starts automatically and at the
same time the welding current rises to the preset
value, first using the welding current adjustment
knob which is on the lower part of the control panel.
The welding current can be adjusted continuously
from a minimum of 10 A to a maximum which
depends on the power of the machine 400 A, 500 A,
600 A.
11/10/04 M33_WDC_GB
Inversion of polarity (Optional, available on
request)
In order to invert polarity, press the switch on the
remote control unit.
By selecting “inversion” the “ON” LED switches off
and the voltage at the welding socket becomes
zero. The power contactor is witched inside the
electrical box and the voltage reappears at the
welding sockets. The “ON” LED switches back on
at the same time.
The “Invert polarity” LED on the front panel near the
welding current adjuster switches on .
You cannot invert polarity in
“MIG/MAG”
mode.
PROTECTIONS
The Welding Digital Control features 3 protections
for the control and chopper.
1) “ON”
LED blinking
When the engine of the welder is
started the control unit automatically
goes to the stand by mode for few istants (stand-by
LED on) and performs a self-diagnosis of the current
sensor connector and power source v 15V;
than the last process is loaded (on led turned ON).
In case of malfunction the
“ON” LED
blinks.
2) Red LED blinking
The chopper has a thermal protection,
which intervenes in case the operating
temperature exceeds 85°C.
If the protection intervenes, the red LED begins to
flash and the welding current/voltage goes to zero.
In this case do not switch off the welder, since the
alternator fan will help cool down the chopper more
quickly.
After a few minutes, the LED will automatically
switch itself off and the welding voltage/current will
once again be available at the plugs.
3) Red LED continuously lit
If an anomalous current is detected in
the chopper, the control blocks the
conversion immediately, the output
welding current/voltage goes to zero and the red
LED lights up. To reset everything, it is necessary
to switch off the machine.
If the protections 1) and 3) should intervene, it is
best to immediately contact the nearest authorised
Service Centre.
DIGITAL INSTRUMENTS
(Optional, available on request)
Two digital instruments showed the operating value
of welding current and welding voltage.
For EP1 version it is compulsory to accelerate
the engine manually.
WARNING
STICK MODE (Electrode)
Features C.C. (Constant Current)
There are three stick modes which feature
increasing “arc forces” so that the arc has different
levels of penetration according to the electrode
and/or welding position.
MIG/MAG MODE (continuous wire)
Features C.V. (Constant Voltage)
All wire type welding processes can be carried out,
naked or coated.
The voltage can be adjusted using the same knob
which adjusts the current in STICK mode.
Adjustment is continuous and goes from a minimum
of 15 V to a maximum of 36V, 40 V.
Optional remote control
The welding current can also be set from a distance
using the optional remote control. Once the remote
control is connected to the connector (X1), the
current is controlled by the remote control. To return
to front panel control remove the connector.
Optional VRD program
(Voltage Reduction Device
VRD)
When you choose the program stick or stick arc
force the Open Circuit Voltage (OCV) go up, red
light switch ON and green light switch OFF, bat
only for about 3”, than the OCV go down, green
light switch ON and red light switch OFF, about
11V and stop there, until the welder start welding.
When you make a short circuit with the stick the
OCV immediately go up, so you can start to welding.
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