Okuma OSP 5000, Electrical Maintenance, Training Manual, Page: 104 / 286

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Okuma America Corporation
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Rev. 8-21-01
Serial IF
The Serial IF is used for data communication between the CRP board and the NC
operation panel. The CRP board transmits the LED indicator data and buzzer data to
the NC operation panel. The NC operation panel in turn transmits the keyboard data
and the switch data of the machine operation panel back to the CRP board. The status
of the switches and lamps can be viewed at the Panel I/O screen in the Check Data
function.
CRP 9 (A911-1580) CRT Processor board
This board has the same function as the CRPII-C board. The only difference is the CRP 9
board has no graphics support. It does not have the Color graphics IF. The CRP 9 board is
standard on the OSP 500 control.
SVP-IID Servo Processor board
This board is used to control the brushless servo motors. The SVP board determines the axis
speed and position. The SVP is equipped to handle one DA/AD, one pulse generator, one
pulse handle, and six sensors. The three major signals that are computed by the SVP are
RAPA, RCON, and RDIFF. RAPA is the actual axis position data coming from the absolute
position encoder used on the axis servo motors. RCON is the computed or commanded axis
position data. RDIFF is the following error. A single SVP board can control two axes. For
control of more than two axes, additional SVP boards and axis cards can be added to the
system. Up to 10 axes may be controlled by one OSP 5020 CNC.
There are three versions of the SVP-IID board. The part number for the standard SVP board
used on lathes is A911-1531. The part number for the standard SVP board used on machining
centers is A911-1533. This board has no DA interface (IF).
Machines with more than five axes use the SVP board part number A911-1531 along with the
SVP board part number A911-1532. The 1532 board has an SPC5 card mounted to it which
receives the clock signals from the SPC4 card. The SPC5 card is only used with the 1532
board.
The DA IF generates a full scale +/- 10 volts analog signal which is used for spindle speed
control. The AD IF is a 0 to 10 volts signal which is used to display the spindle load status at
the CRT.
The pulse generator IF is used for spindle speed and position feedback. The pulse handle IF is
used for determining and storing the number of notches the pulse handle has moved. The six
sensors are used for touch setter options.
Prior to the design of the SVP-IID, the SVP-IIC was used in conjunction with the TB board.
The TB board provided timing for the SVP as well as providing the DA signal for the spindle.
These two functions have now been combined into the SVP-IID board.