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10.13
Date Code 20081022
Instruction Manual
SEL-787 Relay
Testing and Troubleshooting
Self-Test
+3.3 V Fail
M3.3 V power supply
3.07 to 3.53 V
Yes
Latched
Status Fail
+3.3 V Failure
+5 V Fail
M5 V power supply
4.65 to 5.35 V
Yes
Latched
Status Fail
+5 V Failure
+2.5 V Fail
M2.5 V power supply
2.32 to 2.68 V
Yes
Latched
Status Fail
+2.5 V Failure
+3.75 V Fail
M3.75 V power supply
3.48 to 4.02 V
Yes
Latched
Status Fail
+3.75 V Failure
–1.25 V Fail
Monitor -1.25 V power supply
–1.16 to –1.34 V
Yes
Latched
Status Fail
–1.25 V Failure
–5 V Fail
Monitor -5 V power supply
–4.65 to –6.0 V
Yes
Latched
Status Fail
–5 V Failure
Clock Battery Warn
Monitor Clock Battery
less than 2.3 V
No
Not
Latched
RTC Chip
Unable to communicate with clock or
fails time keeping test
No
Not
Latched
RTC Chip
Internal RAM
Clock chip static RAM fails
No
Not
Latched
Mainboard FPGA
(power up)
Fail if mainboard Field Programmable
Gate Array does not accept program
Yes
Latched
Status Fail
FPGA Failure
Mainboard FPGA
(run time)
Fail on lack of data acquisition
interrupts
Yes
Latched
Status Fail
FPGA Failure
External RTD
Fail if no comm, or the external RTD
module reports open RTDs, shorted
RTDs, a power supply failure
NA
NA
Back-plane
comms diagnostics
Fail if GPSB is busy on entry to
processing interval
Yes
Latched
Status Fail
GPSB Failure
CID File
Failure to Access/Read CID File
No
N/A
Status Fail
CID File Failure
Table 10.8
Relay Self-Tests
(Sheet 2 of 2)
Self-Test
Description
Normal Range
Protection
Disabled on
Failure
Alarm
Status
Front-Panel
Message on Failure
Summary of Contents for SEL-787
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