Schweitzer Engineering Laboratories SEL-311C - Relay Self-Tests; Table 13.10 Relay Self Tests

13.58
SEL-311C Relay Instruction Manual Date Code 20060320
Testing and Troubleshooting
Relay Self-Tests
Relay Self-Tests
The relay runs a variety of self-tests. The relay takes the following corrective
actions for out-of-tolerance conditions (see Table 13.10):
➤ Protection Disabled: The relay disables overcurrent elements
and trip/close logic. All output contacts are de-energized. The
EN front-panel LED is extinguished.
➤ ALARM Output: The ALARM output contact signals an alarm
condition by going to its de-energized state. If the ALARM output
contact is a b contact (normally closed), it closes for an alarm
condition or if the relay is de-energized. If the ALARM output
contact is an a contact (normally open), it opens for an alarm
condition or if the relay is de-energized. Alarm condition
signaling can be a single 5-second pulse (Pulsed) or permanent
(Latched).
➤ The relay generates automatic STATUS reports at the serial
port for warnings and failures.
➤ The relay displays failure messages on the relay LCD display
for failures.
Use the serial port STATUS command or front-panel {STATUS} pushbutton to
view relay self-test status.
Table 13.10 Relay Self Tests (Sheet 1 of 2)
Self-Test Condition Limits
Protection
Disabled
ALARM
Output
Description
IA, IB, IC,
IP, VA, VB,
VC, VS Offset
Warning 30 mV No Pulsed Measures the dc offset at each of the
input channels every 10 seconds.
Master Offset Warning 20 mV No Pulsed Measures the dc offset at the A/D
every 10 seconds.
Failure 30 mV Yes Latched
+5 V PS Warning +4.80 V
+5.20 V
No Pulsed Measures the +5 V power supply
every 10 seconds.
Failure +4.65 V
+5.40 V
Yes Latched
±5 V REG Warning +4.75 V
+5.20 V
–4.75 V
–5.25 V
No Pulsed Measures the regulated 5 V power
supply every 10 seconds.
Failure +4.50 V
+5.40 V
–4.50 V
–5.50 V
Yes Latched
±12 V PS Warning ±11.50 V
±12.50 V
No Pulsed Measures the 12 V power supply
every 10 seconds.
Failure ±11.20 V
±14.00 V
Yes Latched