Description Of Starter Unit Hv18 Art. 472 - Cebora PLASMA PROF 164 HQC Service Manual

CEBORA S.p.A.
The control board (38) also manages the user interface, which in this system is divided across
two panels, one on the Power Source and the other on the Gas Console. The panel on the Power
Source is managed directly by the panel board (38) on the Power Source; the one on the Gas
Console is managed by the panel board (20) of the Gas Console, based on the information
provided by the control board (38) via CAN bus line.
The panel on the Gas Console is the main system panel, and allows you to set all operating
parameters. The panel on the Power Source summarizes the information displayed on the Gas
Console panel, and does not allow the operating parameters to be set.
The Power Source control panel is made up of the panel board (38) mounted directly on the
back of the control board (38). It includes:
- two displays to show error codes, the cutting current and nozzle hole diameter.
- a set of leds to indicate the operating status;
- an encoder (knob (I)) to adjust the cutting current.
The connector of the RS232 communication port is located on the front panel for connecting
to a Personal Computer, through which it is possible to update the Power Source software.
The pilot arc board (58) receives the temperature signals from the thermostats located on the
transformer (27) and igbt dissipater of the pilot arc board (58) itself.
Based on these signals, the Power Source is blocked for overtemperature, with the displays of
the two control panels showing the corresponding error code.
The torch board (42) acts as an interface with the Power Source output; it receives and affects
those signals particularly affected by disturbances, because they arrive from critical areas of the
system.
These signals include:
- Power Source output voltage;
- pilot arc voltage;
- "carter open" signal on the Unit HV18.
The fan (20) to cool the power components of the Power Source is connected directly to the
primary circuit of the transformer (27) (the same winding that powers the cooling unit). It is
therefore sufficient to close the contactor (44) for it to be powered, always at 230 Vac.
The signals processed by the electronic boards and present at their connectors are listed in the
tables in chapter five.

2.5 - Description of Starter Unit HV18 art. 472.

The Starter Unit HV18 art. 472 is a high-voltage and high-frequency Power Source for arc
striking in the torch CP250G.
For optimum yield it must be located near the torch, therefore we recommend connecting it
directly to the prepared terminals of the torch cable without inserting other extensions. Using the
extension art. 1179, included to connect the Power Source and HV18 Unit and supplied together
with the cutting system, it is possible to position the Power Source away from the pantograph or
robot (max. 12 m).
Referring to the electrical diagram in par. 5.1, the drawing in par. 4.1 and table 4.2, one may
see the main elements that make up the Unit HV18.
It is essentially made up of the control box board (2), HF board (5) and HF transformer (7).
The control box board (2) connects the torch cable and extension cord from the Power Source,
and applies the filters necessary to suppress disturbances.
The HF board (5), combined with the HF transformer (7), generates the high-voltage and
high-frequency pulses to apply to the electrode and nozzle torch terminals, to strike the pilot arc.
Its operation is conditioned by the value of the Power Source output voltage, measured
between the positive output pole of the Power Source (nozzle potential) and terminal (53)
downstream from the choke (24) (electrode potential). With a voltage greater than 200 Vdc, the
circuit generates high-voltage and -frequency pulses; at lower voltages the circuit stops.
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9/8/2006