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Okuma America Corporation
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Rev. 8-21-01
The following is a description of the alarm and CPU status LED’s located on the control rack.
For the non-rack type CPU power supplies the alarm LED’s are located on the power supply
itself.
Alarm LED’s
AC Input voltage dropped too low.
TEMP Temperature in power supply rose too high.
UV Under voltage or possible short circuit.
OV Voltage rose too high. (over voltage)
ISO 24V One of these LED’s will be on when a UV or OV alarm occurs
+24V to indicate which voltage source is affected.
+12V
+5V
CPU status LED’s
POWER There is 5 volts going to the mother board (back plane).
Main board is plugged into mother board.
RUN CPU is operational or running.
BUS Error More than one error occurred at the same time. The CPU stops
running.
ECC Error Error in the main memory of the system.
DIA Error An error occurred during the self-diagnosis function.
LOOP Error The CPU interrupt time has exceeded its limit.
CYCLE Error The CPU tried to access a peripheral device and did not get a
response within the specified time (17 micro seconds).
WPRT Error The CPU tried to access a user inhibited address.
Printed Circuit Boards
In 1981 Okuma introduced the industry’s first 16 bit CNC which incorporated Motorola’s 68000
microprocessor chip. This chip had the capability of multiplying two 16 bit numbers in 3.2
millionths of a second. Okuma still uses Motorola’s family of 68000 microprocessor chips as
the nerve center of the OSP 5000/5020 series control. The following is a description of each
major unit that makes up the control rack of the OSP 5000/5020 series control. The control (or
logic) rack is referred to as the OPUS (Okuma Processing Unit and System).
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