Product Manual

USE WELDING ANALOG CONTROL (350A)
M
33.3
REV.0-06/10
PUSH AND
SCREW TIGHT
ARC FORCE
ARC FORCE REGULATION
This type of regulation, possible only in CC mode, is
accomplished by setting the position of the “arc force”
switch and by adjusting the “arc force” knob. Both are
located on the WAC panel.
For the welding processes which require a strictly con-
stant current (e.g. TIG), the switch has to be placed in
OFF position while the potentiometer position is irrele-
vant.
For the welding processes where a certain degree of arc
force is suitable, the switch has to be positioned in ON
and the potentiometer has to be properly adjusted, de-
pending on the electrode type and the welding position.
REMOTE CONTROL
The WAC can accept the connection to a remote control
box (optional) through a circular connector placed on
the EAC panel.
After connection to a remote controller, the regulation
function of the main knob is automatically switched to
the knob on the remote controller.
The following table describes the pin function of the cir-
cular connector.
CONTACTS DESCRIPTION
A (Ground) To the RC1 potentiometer – GND terminal
B To the RC1 potentiometer – V
CONTR
terminal
C To the RC1 potentiometer – V
REF
terminal
D Remote connection presence contact –
wire bridge towards (C) cabling side
E Non connected
F Non connected
G Welding enable contact in CV – enables
when the contact is closed towards (I)
H Negative pole of the welding voltage – to
monitor the welding voltage by means of
an instrument on the wire feeder
I 42Vac ±10% – phase A – for the power
supply of the wire feeder
J 42Vac ±10% – phase B – for the power
supply of the wire feeder
WIRE FEEDER
The welding control unit WAC is ready for connection to
a wire feeder (optional), to be used in C.V. mode. The
wire feeder can be supplied from a 42Vac ±10% source
through the circular connector of the WAC. In this case,
the same connector is used to interface the controller
with a contact which enables the welding (conditioned
by the torch trigger) and a remote potentiometer located
on the wire feeder (where present).
In case of wire feeders directly supplied from the wel-
ding power, the operation is anyway possible. With this
type of wire feeders there is no need for any connection
to the circular connector of the WAC.
VRD FUNCTION (VRD = Voltage Reduction Device)
The VRD function (present only on some versions) ful-
ls the purpose of drastically reducing the harm which
may result to a person from inadvertent contact with the
electrode during non-welding pauses. The VRD auto-
matically switches the control mode in CV and sets the
voltage to a safe value (typically <13V) each time the
welding process is interrupted for a period
longer than 3 sec.
The VRD function is active only in CC mode.
The proper operation of the VRD protection
(in the models where it is implemented) is
monitored by a couple of LEDs: one green
and one red. During welding the red LED in-
dicates that a condition of electrical risk is
present. When the welding is stopped for more than 3
sec. the green LED turns on (and the red LED turns off)
indicating that the VRD function is active. This means
that the voltage on the electrode has been lowered to a
safe value.
ARC FORCE
ON
OFF
06/07/10 M33WAC-GB
VRD