Varian MidiVac 929-5000 Bedienungshandbuch Seite 31

It consist of various boards. The following figure shows
the minimum configuration.
MidiVac Controller Boards (Top view)
1. Dc power supply board: it contains the EMI filter.
The ac input voltage is rectified and the needed
DC output voltages are generated.
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2. Microprocessor board (located on front panel: it is
based on a single chip microprocessor with a large
input/output capability. It manages commands
coming from the front panel keyboard and drives
the front panel display and the high voltage output.
3. Voltage multiplier board: it multiplies four times the
voltage from the transformer.
4. Display and front panel keyboard: it contains the
functional push buttons, the LEDs indicating active
operating mode and the LCD display.
The high voltage circuitry receives the ac voltage from
the mains and converts it into an high voltage to drive
the pump. The output voltage and current are
continuously measured and displayed on the front
panel display. The controller automatically limits the
output voltage according to the following voltage versus
current diagram.
An analog signals output connector allows the user to
control the MidiVac operation (see the following
paragraph for more information about the signals
available on this connector).
Leave at least 30 mm (1.2 inches) of free air circulation
on top and bottom of the unit for an efficient cooling of
the unit. Blind the unused slots on rear panel with the
provided covers.
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TECHNICAL INFORMATION
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