CSPP Capacitor Charging Unit Operation Manual
CSP-CSPP-8000/2
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Page
29
of
59
Control Board
Key Circuit
Drawing No CSP1000-5000 Section 3.
Key Board
Drawing No CSP1000-5003 Section 3.
The power supply can be triggered using any of the following:-
1.
Key in
is via the BNC connector on the front panel. The key source is opto-isolated, and this
can be either a pulse (3-24VDC) or a contact closure, selectable using the key polarity switch
on the front panel.
2.
Remote key in
is via the remote box and cable (3-24VDC positive key only). Key source is
opto-isolated from the power supply.
3.
Manual key
- each time the switch is depressed.
The Key In / Remote Key signal is applied to the key board optically coupled via OP1 and OP2 to
IC1A on the control board. IC1A generates a 150mS delay preventing repetition rates in excess of
6 times per second. The output of IC1A triggers IC1B which produces a 1mS pulse to key the
trigger board via the driver IC4.
IC2 is configured as a
time out
alarm. If there is no key input after 20.25 seconds, the Fault / Time
Out LEDs on the front panel will illuminate and the high voltage will be disabled.
A 50mS pulse is generated via IC8A inhibiting the high voltage charger during and after the firing of
the SCR. IC4 is also used to drive the HV ON / OFF and Key LEDs on the remote box.
High Voltage / Relay Switching
Drawing No CSP1000-5000 Section 3.
The high voltage capacitors are switched in / out of circuit using the Output Power Switch located
on the front panel. The power select switch is connected via the front panel board to IC3 on the
control board. When the high voltage button is pressed , (providing no fault conditions occur), an 0
on any of the switch inputs will allow that capacitor to be placed in circuit.
For Capacitor 1 in the diagram; with no fault latches activated, IC11D O/P is high allowing 11A O/P
to be high. IC9A generates a ½ second delay before allowing relay RLA to close via IC10A. RLA
closing connects mains VAC to the high voltage relay, switching the HV capacitor in circuit.
IC7B produces a 3 second delay after the high voltage button is pressed, before the HV is
activated. Relay RL1 controls the HV ON / OFF in the charging unit. ICs 9A, 9B, 8B and 7A all
provide a small time delay, (less than 3 seconds), allowing the HV capacitors to be in circuit before
the charger high voltage is connected. The sequential delays for switching these relays is to
ensure large current pulses are not drawn from the toroidal transformer.
