Schweitzer Engineering Laboratories SEL-751 - Page 635

11.15
Date Code 20170927 Instruction Manual SEL-751 Relay
Testing and Troubleshooting
Self-Test
Card Z (turn on)
Fail if ID register does not match part
number
Yes Latched Yes Status Fail
Card Z Fail
Card Z 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.
ADCCHK (Slot Z)
A/D reference channel check
<2.375 V
or
>2.625 V
Yes Latched Yes Status Fail
Card Z Fail
Automatic restart.
Contact SEL, if
failure returns
Card E (turn on)
Fail if ID register does not match part
number
Yes Latched Yes Status Fail
Card E Fail
Card E A/D Offset Warn
Measure dc offset at each input channel
–50 to
+50 mV
No Not
Latched
No NA
STA C, to clear
the warning in the
status report.
Contact SEL if
failure returns.
ADCCHK (Slot E)
A/D reference channel check
<2.375 V
or
>2.625 V
Yes Latched Yes Status Fail
Card E Fail
Automatic restart.
Contact SEL, if
failure returns
+0.9 V Fail
Monitor +0.9 V power supply
0.855 to
0.945 V
Yes Latched Yes Status Fail
+0.9 V Failure
+1.2 V Fail
Monitor +1.2 V power supply
1.152 to
1.248 V
Yes Latched Yes Status Fail
+1.2 V Failure
+1.5 V Fail
Monitor +1.5 V power supply
1.35 to
1.65 V
Yes Latched Yes Status Fail
+1.5 V Failure
+1.8 V Fail
Monitor +1.8 V power supply
1.71 to
1.89 V
Yes Latched Yes Status Fail
+1.8 V Failure
+3.3 V Fail
Monitor +3.3 V power supply
3.07 to
3.53 V
Yes Latched Yes Status Fail
+3.3 V Failure
+5 V Fail
Monitor +5 V power supply
4.65 to
5.35 V
Yes Latched Yes Status Fail
+5 V Failure
+2.5 V Fail
Monitor +2.5 V power supply
2.32 to
2.68 V
Yes Latched Yes Status Fail
+2.5 V Failure
+3.75 V Fail
Monitor +3.75 V power supply
3.48 to
4.02 V
Yes Latched Yes Status Fail
+3.75 V Failure
–1.25 V Fail
Monitor -1.25 V power supply
–1.16 to
–1.34 V
Yes Latched Yes Status Fail
–1.25 V Failure
–5 V Fail
Monitor -5 V power supply
–4.65 to
–5.35 V
Yes Latched Yes Status Fail
–5 V Failure
Clock Battery
Monitor Clock Battery
2.3 to
3.5 V
No Not
Latched
Yes NA
STA C, to clear
the warning in the
status report.
Contact SEL if
failure returns.
Ta b l e 1 1 . 8 Re l ay S e l f-Tes t s (Sheet 2 of 3)
Self-Test Description Normal
Range
Protection
Disabled
on Failure
Alarm
Status
Auto
Message
on Failure
Front Panel
Message
on Failure
Corrective
Action