2-5
Figure 2.1 shows the power system diagram of this equipment.
DC power passes through the circuit breaker via the line filter in the power circuit
CBD-1702A, and it is re-input to the power circuit CBD-1702A for generating the supply
voltage to be used inside the equipment. The power circuits are of the high-efficiency
switching type.
This equipment has an overvoltage protection function. If the input voltage exceeds
about 42 VDC, the power circuit CBD-1702A stops the output of the supply voltage to be
used inside the equipment; if the input voltage exceeds 50 VDC, it turns off the circuit
breaker, thus protecting the equipment from an overvoltage. The protective voltage is set
with the constant in the power circuit CBD-1702A.
The P+12V power supply is active even when the power switch on the operation unit is
turned off. This power supply is used with circuits such as the control circuits in the power
circuits.
When the power switch on the operation unit is turned on, the power supply to be used
inside the equipment is started, and the +5V, +3.3V, +12V, and -12V power supplies are
output for starting the equipment. The +5V and +3.3V power supplies are used mainly
with the ICs of control circuits. The +12V and -12V power supplies are used mainly with
external interface circuits.
The power output relay for the scanner unit operates in conjunction with the power switch
on the operation unit.
An overcurrent protection function is provided for each power output. If a load is
short-circuited or exceeds the rating, the protection function works to turn off the output.
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