Schweitzer Engineering Laboratories SEL-787 - Page 369

10.13
Date Code 20081022 Instruction Manual SEL-787 Relay
Testing and Troubleshooting
Self-Test
+3.3 V Fail Monitor +3.3 V power supply 3.07 to 3.53 V Yes Latched
Status Fail
+3.3 V Failure
+5 V Fail Monitor +5 V power supply 4.65 to 5.35 V Yes Latched
Status Fail
+5 V Failure
+2.5 V Fail Monitor +2.5 V power supply 2.32 to 2.68 V Yes Latched
Status Fail
+2.5 V Failure
+3.75 V Fail Monitor +3.75 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