Date Code 20011009
SEL-701-1 Monitor
Maintenance & Troubleshooting
Self-Testing
9.3
Self-Testing
The monitor runs a variety of self-tests. As shown below, when the monitor
detects certain types of self-test failures, it closes the ALARM output b-contact.
Monitoring this contact is the single most important monitor maintenance activity that
you can perform.
The monitor takes the following actions for out-of-tolerance conditions in
Protection Disabled
The monitor:
Disables all protection functions and stop/start logic.
Deenergizes all output contacts.
Extinguishes the Enabled front-panel LED.
ALARM Output
The ALARM output contact signals an alarm condition by going to its
deenergized state.
The ALARM output b-contact closes for an alarm condition; the
ALARM output a-contact opens for an alarm condition or if the
monitor is deenergized.
The monitor generates a STATUS report at the serial port for failures.
The monitor displays failure messages on the monitor display.
Use the serial port
STATUS
command or front-panel Status of Monitor function
to view the monitor self-test status.
Table 9.2
Monitor Self-Tests
(Sheet 1 of 2)
Self-Test
Description
Limits
Protection
Disabled on
Failure
ALARM
Output on
Failure
Front-Panel
Message on
Failure
DC Offset
Measures the dc
offset at each of
the input
channels.
160 mV
Yes
Latched
OFFSET
FAILURE
+5 V PS
Measures the +5
V power supply.
+4.65 V+5.65
V
Yes
L5V
FAILURE
-5 V PS
Measures the -5
V power supply.
-4.65 V-5.40 V Yes
Latched
-5V FAILURE
+15 V PS
Measures the
+15 V power
supply.
+14.00
V+16.00 V
Yes
Latched
+15V FAILURE
Содержание SEL-701-1
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