Sel SEL-787 - Page 384

10.12
SEL-787 Relay Instruction Manual Date Code 20150130
Testing and Troubleshooting
Self-Test
Front-Panel HMI (power up)
Fail if ID registers do not match
expected or if FPGA programming is
unsuccessful
No Not
Latched
Yes NA STA C, to clear
the warning in the
status report.
Contact SEL if
failure returns.
External RAM (power up)
Performs a read/write test on system
RAM
Yes Latched No No
External RAM (run time)
Performs a read/write test on system
RAM
Yes Latched Yes Status Fail
RAM Failure
Automatic restart.
Contact SEL if
failure returns.
Internal RAM (power up)
Performs a read/write test on system
CPU RAM
Yes Latched No No
Internal RAM (run time)
Performs a read/write test on system
CPU RAM
Yes Latched Yes Status Fail
RAM Failure
Automatic restart.
Contact SEL if
failure returns.
Code Flash (power up)
SELBOOT qualifies code with a
checksum
NA NA NA NA
Data Flash (power up)
Checksum is computed on critical data
Yes Latched Yes Status Fail
Non_Vol Failure
Data Flash (run time)
Checksum is computed on critical data
Yes Latched Yes Status Fail
Non_Vol Failure
Critical RAM (settings)
Performs a checksum test on the active
copy of settings
Yes Latched Yes Status Fail
CR_RAM Fail-
ure
Automatic restart.
Contact SEL if
failure returns.
Critical RAM (run time)
Verify instruction matches FLASH
image
Yes Latched Yes Status Fail
CR_RAM Fail-
ure
Automatic restart.
Contact SEL if
failure returns.
I/O Board Failure
Check if ID register matches part
number
Yes Latched Yes Status Fail
Card [C|D|E]
Failure
DeviceNet Board Failure
DeviceNet card does not respond in three
consecutive 300 ms time out periods
NA NA NA COMMFLT
Warning
CT Board (power up)
Fail if ID register does not match part
number
Yes Latched Yes Status Fail
CT Card Fail
CT Board A/D Offset Warn
Measure dc offset at each input channel
–50 mV
to
+50 mV
No Not
Latched
No NA STA C, to clear
the warning in the
status report.
Contact SEL if
failure returns.
VT Board (power up)
Fail if ID register does not match part
number
Yes Latched Yes Status Fail
Card E Fail
Table 1 0.8 Rel ay Self-Test s (Sheet 2 of 4)
Self-Test Description
Normal
Range
Protection
Disabled
on Failure
Alarm
Status
Auto
Message
on Failure
Front Panel
Message
on Failure
Corrective
Action