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Should there be a short circuit or irregular voltage drops between electrodes, the
power supplied to energise the terminal is reduced. It is controlled by the following systems:
T27, PO1, T29, T30, and US23. One of the electrodes is connected to the M potential
(system earth). The other electrode is connected to the D110 current oscillator output and
the so-called ignition spark oscillator, i.e. 250V keyed voltage, using the T192 transistor,
synchronous with de-energising of the mentioned oscillator. Its operation is signalled by the
lighting up of the IGNITION lamp.
The signal coming from the active electrode is supplied to the system that identifies
and forms control runs of the motor, i.e.
T27, P01, R90, C36, US15
T28, P02, R90, C37, US14
T28, P02, R106, C38, US13
including the following signals:
US11
+
C
-
C
all of which are transferred to the reader and microprocessor controller system.
The reader is responsible for controlling displays, keypad, and meters assigned to each of
the axes, as well as for energising stepper motors, according to the set program.
The signalling system collects information from a sensor that detects petroleum level and
temperature at limiting switches, and from a thermistor installed on the inverter radiator. It
signals erroneous statuses, by the flashing of an appropriate signal lamp. In the case of
automatic working mode, the system shuts down the oscillator (T20, ST1) and generates an
additional acoustic signal.
If the RC oscillator is activated, the inverter of the oscillator (US23) is shut down, while the
T26 and D60 systems are also activated to generate the
as well as the PK2 relay of the C100 capacitor powered by a 250V ignition resistor is also
activated. In this mode, the synchroniser works for a shorter period of time, the T192 and
T193 systems are activated, and the afore-mentioned inverter is deactivated. The signals
that control the motor are generated in the same manner as the ones controlling the
oscillator-based operation.
6. INSTALLING AND CONNECTING THE MACHINE
One must exercise extra attention and thoughtfulness, when drilling with the BP93p machine.
Pay particular attention to the fire protection of both the machine and the room in which it
operates, as sparks are produced that may come into direct contact with the dielectric fluid.
The EDM machine must be installed in a separate room that meets the following conditions:
Good lighting;
Low level of noise;
Good ventilation (it is recommended to extract the gases accumulating above the
machine);
Good fire protection (have a carbon-dioxide extinguisher available);
Air temperature in the 15-25
Medical protection (first aid kit);
Fire protection: fire-fighting equipment should be placed in easily accessible places
that are not exposed to hazards (as much as possible).
The machine must be positioned in such a way that there is convenient access to the main
switch and all the components subject to periodic inspections. The machine must be subject
© Zakład Automatyki Przemysłowej B. P.
"
"
SHORT CIRCUIT
"
"
OPERATION
"
"
SLOW DOWN
Periodic retracting
Positive rotation pulse
Negative rotation pulse
o
C range;
Retract electrode
Stop electrode
Retract, if work efficiency
has exceeded 90%
"
"
OPERATION
- Stop motor signal,
5
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