Cooling Unit Grv12 (Optional) Item No 1683; Description Of Wire Feed Unit - Cebora KINGSTAR 400TS Manual De Servicio

CEBORA S.p.A.

2.4 Cooling unit GRV12 (optional) Item No 1683

The GRV12 cooling unit is powered using two phases of the mains voltage, taken from
main stilt board (39), by means of autotransformer (38) (400/230 Vac). Microswitch
board (37) is the board that controls the activity of the cooling unit. More specifically, the
"cooling unit enable" signal of the microswitch board (37) commands relay RL3 of the
filter+precharge board (39), which directly powers the cooling liquid pump (26) and the
fans (2).
Pressure switch (23), inserted in the hydraulic circuit on the delivery of pump (26),
sends an (isolated) signal proportional to fluid pressure directly to microswitch board
(37).
When the power source is turned on, microswitch board (37) checks that the cooling
unit is connected using the signal provided by the jumper between terminals 1 and 2 of
connector (9) located on the cooling unit.
When the unit is turned on, if continuous or automatic operation is set (see the
Instruction Manual), pump (26) and fans (2) will run for 30 seconds to fill the torch pipes
and check the commissioning pressure of the hydraulic circuit; after which, if no welding
command is given by the operator, they will stop and await a new start command.
If, when the pump is running, the pressure switch does not detect pressure, the LCD
monitor will display the pump alarm and after 30 seconds alarm 75 will appear. In the
MMA process, operation of the cooling unit is kept disabled.
The unit's operating mode is set in the menu->accessories path.

2.5 Description of wire feed unit

The wire feed unit is powered by power source power board (42) through connector
(230) Y which is connected to power source connector (18) M.
Power voltage (35 Vdc) is applied to motor control board (224), which generates the
auxiliary power supplies necessary for operation of the wire feed unit, including the
supply to panel circuit (212).
Connector (230) Y also houses the CAN-BUS communication line, through which the
microprocessors of control panel (212) and wire feed unit (222) communicate with the
microprocessor of power source (70) (see section 2.3).
Motor control board (222) contains a circuit for regulating the speed of wire feed unit
motor (208), a continuation of the CAN-BUS communication line for communicating with
panel circuit (212) and controlling the two gas solenoids (224).
Wire feed motor (208) is equipped with an encoder for accurate control of motor
m/min.
Switch (226) located on the wire feed unit casing provides motor control board (222)
with a signal to stop the power source if the casing opens. This alarm condition is
indicated on the panel circuit (see error codes, section 3.6.25).
The seat unit front panel houses centralised attachment (214) B for MIG torches,
which incorporate a power fitting, two contacts for start control and an air fitting for the
gas. Gifas attachment C and gas attachment D are also present for the TIG.
Connector board (219) E positioned on the feed unit front panel communicates with
motor control board (222) by means of unencrypted signals and acts as an interface for
power source input and output signals.
The signals are as follows:
power source start (from MIG/TIG torch button);
3301045
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17/09/2019