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Self-Test Status
The DPU1500R provides continuous self-testing of its power supply voltages, its memory elements and digital signal
processor and its program execution. In the event of a system failure, the protective functions are disabled and the
Self-Check Alarm contacts are actuated. Except for a "processor stalled" condition, review the PASS/FAIL status of
these self-test elements by using the man-machine interface (MMI). Normal status is indicated by a green NORMAL
STATUS light (LED) and system failure is indicated by the red FAIL STATUS light (or by the green NORMAL STATUS
light not being lit in the case of a loss of control power).
Self-Test Failures are recorded as a decimal number in the Operations Record. After converting this number to binary,
the binary bit pattern indicates the Self-Test Failure or Editor Access Status involved. The 1s in the bit pattern indicate
where a failure has occurred. Count from the right of the bit pattern (starting with zero) to the position where a "1"
occurs. Compare that bit position with Table 7-1 to reveal the failure. See the examples on page 7-6 for further explanation.
If the self-test fails, the DPU1500R is no longer providing protection. Replace the unit as soon as possible.
Table 7-1. Operations Record Value Information
Bit Position
0
CPU RAM
1
CPU EPROM
2
CPU NVRAM
3
CPU EEPROM
4
NOT USED
5
NOT USED
6
NOT USED
7
NOT USED
8
DSP ROM
9
DSP INTERNAL RAM
10
DSP EXTERNAL RAM
11
DSP ANALOG/DIGITAL CONVETER
DSP +/-15, + 12 V POWER SUPPLIES
12
13
14
DSP STALL or +5 V POWER SUPPLY
15
DSP TO CPU COMMUNICATIONS
Records
Self-Test Failure
website:www.abb.com/papd
ABB Distribution Protection Unit 1500R
Editor Access Status
INTERRUPT LOGGING
REMOTE EDIT DISABLE = 1
LOCAL EDIT DISABLED = 1
FRONT MMI EDIT ACTIVE
FRONT COMM PORT EDIT ACTIVE
REAR COMM PORT EDIT ACTIVE
REAR AUX COMM PORT EDIT ACTIVE
REAL TIME CLOCK EDITED
PROGRAMMABLE I/O EDITED
PRIMARY SET EDITED
ALTERNATE1 SETTINGS EDITED
ALTERNATE2 SETTINGS EDITED
CONFIGURATION SETTINGS EDITED
COUNTER SETTINGS EDITED
ALARM SETTINGS EDITED
COMMUNICATIONS SETTINGS EDITED
Decimal Value
1
2
4
8
16
32
64
128
256
512
1024
2048
4096
8192
16384
32768
7-5
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