CSPP Capacitor Charging Unit Operation Manual
CSP-CSPP-8000/2
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Fault Latches / HV on Circuit
Drawing No CSP1000-5000 Section 3.
A reset / fault condition can occur due to any of the following:-
1. High voltage connector to transducer not being connected while power supply is switched ON.
2. The top cover has been opened or left OFF with power supply switched ON.
3. The power supply has not received a key for approximately 20 - 25 seconds.
4. The output power switch has been changed.
5. A failure on the 12V logic supply.
6. A fault has occurred with the high voltage diodes.
7. There is a short or open circuit on the output cable or load.
If the high voltage connector is disconnected or top cover left off, the mains relay located under the
left side panel will open, disconnecting mains to the charger. (See Relay Board, Section 3)
Any high voltage within the charger is then dumped via an internal resistor network. The input to
IC5A via opto-isolator OP4 will go high, setting the RS latch. IC5 output is fed to IC6 (8 input OR
gate). A logic 1 on any of the inputs will activate the OR O/P, Pin 1. This resets IC5D, which holds
the O/P of IC11D low.
With IC11D O/P low, all the capacitor switching relays RLA-D (see HV / Relay Switching Circuit)
are deactivated. Any high voltage relays in circuit will open, discharging the high voltage
capacitors to ground via 10K dump resistors situated on the right side panel.
IC11D O/P at logic 0 also stops the key to the trigger board via IC4 Pin 8 and disables the charger
ON / OFF relay RL1 by resetting IC7B.
The O/P from the time out alarm IC2 is fed to IC6 via RS latch IC5B. An input to IC6 is also
provided from the front panel board resetting the system if the power select switch is operated
independent of high voltage status. (Reset circuit shown on front panel board.)
The HV OFF / RESET switch on the front panel connects to IC6 via IC3C. The fault LED situated
on the remote box is controlled by D3/D7 acting as a diode
OR gate, with Q2 as driver transistor.
If there is an open circuit in the high voltage diodes situated on the RHS panel, the high voltage will
switch off and keep resetting until the diodes have been replaced. The same fault condition may
occur if there is a short circuit on the output cable or in the sound source itself. A current monitor
circuit disables the high voltage charger and resets IC6 via Pin 11.