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H. Description of 3000 / 300 Divider Board # 10407715
This board provides the reference voltage to the Charge Control board. This voltage is
proportional to the capacitor bank voltage divided by approximately 10. The
potentiometer on this board is used to set the maximum voltage of the machine. This has
been factory preset and should not require adjustment unless the Charge Control board or
the Voltage Control potentiometer are repaired or replaced.
I. Technical Description of 3000 / 300 Divider Board # 10407715
The high voltage side of the capacitor bank is connected to 1CN terminal 1, common or
ground of the capacitor bank is connected to 1CN terminal 2 which is common with the
output connector 2CN terminal 1 and the low voltage output is 2CN terminal 3. The high
side of the divider is the four 4 Meg ohm resistors (R3, R4, R5, and R6) in parallel,
yielding a total resistance of 1Meg ohm. The low side of the divider is the 100K ohm
resistor (R7). The 20 K ohm potentiometer (PT1) allows adjustment of the absolute
output voltage. The potentiometer should be adjusted for the desired level with the
impedance of the circuit that this board drives connected.
J. General Description of Parallel SCR Driver Board # 10412049
Caution
: This board is referenced to the high voltage potential of the Main
Capacitor Bank any trouble shooting requires test equipment that is
isolated from earth ground. Touching such isolated equipment while the
machine is charged constitutes a definite shock hazard that may result in
serious injury.
This board is used to simultaneously (less than 100 nano-seconds) provide the gate drive
signal to an electrically matched pair of SCRs. The board contains isolated power
supplies, for each driver circuit. A single optically isolated start input simultaneously
triggers both output driver circuits. The board has two green LEDs to signify power is
applied to each of the two driver circuits, and two red LEDs that indicate the gate drive
signal has been supplied to the gates of the SCRs. This board also has an isolated voltage
divider that is not used in the 942B.
K. Technical Description of Parallel SCR Driver Board # 10412049
This board contains two identical driver circuits and two identical negative bias circuits.
The technical description will describe one of the two driver circuits, and one of the two
negative bias circuits the other circuit works exactly the same but the circuit designations
of the components are different.
Summary of Contents for 942B
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