CEBORA S.p.A.
8
The “-”(BO) power output of the power source is located on the front panel, while the
“+”(BR) power output is located on the rear panel. They must be connected to the wire feeder
differently according to the type of welding to be carried out (see Instruction Manual).
2.5
- Description of WF4-P Wire Feeder.
The wire feeder is powered by the flyback board (539) of the power source, through the
connector (206), which is connected to connector (506) of the power source. The supply voltage
(55 Vdc) is applied to the motor control board (232), which generates the auxiliary power
supplies necessary to operate the wire feeder, including the control panel (324).
The connector (206) also includes the CAN-BUS communication line, with which the
microprocessors of the control panel (PANEL) and wire feeder (MOTOR) communicate with the
microprocessor of the power source (MASTER) (see par. 2.3).
The motor control board (232) contains the circuit to adjust the wire feeder motor (404) speed
(which in this case is equipped with speed feed-back signal obtained from the encoder built into
the motor (404)), the continuation of the CAN-BUS communication line to dialogue with the
control panel (324), and the circuit to manage and drive the gas solenoid valve (227).
The switch (211) on the door of the wire feed unit provides the motor control board (232)
with the signal to stop the power source in case the door is opened. This alarm condition is
signaled on the control panel (see error code par. 3.7).
The connector board (225), located on the front panel of the wire feeder, receives power from
the motor control board (232), and communicates with the latter by means of a dedicated RS232
serial line. A microprocessor handles the input and output signals of the wire feeder, and thus of
the welding system, on the connector (BB).
These signals include:
−
Start power source (from the button on MIG or TIG torches or from an automated system).
−
Inputs for external adjustment of the welding current (from UP/DOWN buttons).
−
Inputs for external adjustment of the welding current (from external potentiometer).
−
Inputs for external adjustment of the wire feeder motor speed (from UP/DOWN buttons).
−
Inputs for torch recognition or other connected accessories.
−
Motor power supply output for push-pull torches (not yet available).
−
Arc on signal output (NO contact free from voltage).
−
RS232 serial communication line for dialogue with external system controllers.
Based on the “torch recognition” signal, an analogic signal whose levels, spaced at intervals
of 0,25 Vdc, identify the devices connected to the connector (BB), the microprocessor on the
connector board (225) prepares the welding system so that it can be controlled by means of the
aforementioned signals. One of the possible positions enables the external RS232 serial line, to
control the welding system by means of an external controller. This line is normally kept
disabled.
The “start” and “arc-on” signals are exchanged with the motor control board (232) in clear,
thus directly; all of the other signals are converted into serial information and exchanged via the
internal RS232 serial line, inserted in the connections between J3 on connector board (225) and
J7 on motor control board (232). All these signals are isolated from the circuits of the motor
control board (232), by means of the optocouplers present on the motor control board (232).
3.302.191
15/02/05
