Date Code 20011009
SEL-701-1 Monitor
Section 9
Maintenance & Troubleshooting
Routine Maintenance Checks
Because the SEL-701-1 Monitor is equipped with extensive self-tests, the most
effective maintenance task is to monitor the monitor ALARM contact. The ALARM
output contact closes when the monitor is deenergized or when monitor self-tests fail.
If you are monitoring the ALARM contact, you know immediately if the monitor is
deenergized or detects a failure. In addition, we recommend review of monitor event
reports following faults. This review frequently reveals problems with equipment
external to the monitor such as voltage transformers and control wiring.
The SEL-701-1 Monitor does not require specific routine tests, but your
operational standards may require some periodic monitor verification. If you need or
wish to perform periodic monitor verification, we recommend the following checks.
Monitor Status Verification
Use the front-panel Status of Monitor or serial port
STATUS
command to verify
that the monitor self-tests have not detected any out-of-tolerance conditions.
Meter Verification
Verify that the monitor is measuring current signals and, if included, voltage
signals by comparing the monitor meter reading to the reading of a separate meter
connected in series (for current circuits) or parallel (for voltage circuits) with the
monitor input.
Contact Input Verification
With the monitor and motor off-line, short-circuit the individual monitor contact
inputs using a wire jumper or the connected switch or contact. Using the front-panel
View Relay Word\Row 9 function, check the contact input status in the monitor front-
panel display. As you short-circuit each input, its label (IN1, IN2, IN3, etc.) should
appear in the front-panel display.
Содержание SEL-701-1
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