Okuma OSP 5000, Электротехническое обслуживание, Учебное пособие

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Okuma America Corporation
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Rev. 8-21-01
The servo systems (axes and spindle drives) receive the incoming 3 phase power and convert it
to the DC voltage (300 Vdc) needed to drive the motors. These power supplies will be discussed
in the servo systems part of this section.
220 volts single phase AC also gets sent to the OPUS power supply unit (CPU power supply)
which provides all the power needed for the control rack.
On machining centers, 220 volts single phase also gets sent to the EC I/O rack. Once there, the
voltage gets distributed and rectified as needed for the I/O boards.
OPUS 5000/5020 Power Supply Unit
Okuma’s CPU power supply converts the incoming 220 AC voltage into the various stabilized
DC voltages needed to run the OSP 5000/5020 control. It controls the On/Off sequence. It
provides power to the CPU first and makes sure the CPU is the last to power off. There are two
types of CPU power supplies on 5020 controls: RLP and RHP.
The RHP (Rack High Power) outputs the following voltages:
+ 5V For the integrated circuits (IC’s) in the control.
+ 12V For the bubble memory, position encoder, main spindle pulse
generator, and the manual pulse generator (Pulse Handle).
+24V For the bubble memory and tape reader.
The RLP (Rack Low Power) outputs all of the above DC voltages plus:
ISO +24V For the photo-couplers used in the CNC’s I/O system.
The ISO 24V is an isolated power source used to protect the internal circuitry of the
control. The ISO 24V is generated externally when an RHP is used. It is generated by a
DC power supply that converts 120 volts AC to 24 volts DC. The ISO 24V circuitry
does go through the RHP for monitoring purposes.
The RLP and RHP are located or housed in the CPU rack.
The first CPU power units that came out with the OSP 5000 series control were called HP and
LP. When the graphics capability was incorporated into the control, the power units were la-
beled GHP and GLP. These four CPU power supplies output all the voltages mentioned above.
These four units are physically larger than the RLP and RHP units. They are located above the
CPU rack. Some of the latest models (5020 controls) still use the GHP CPU power supply
instead of the RHP.