GE DR60, Technical Manual

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DR60
103 DR60-TM-EN- 2A
1.1.1 In-service maintenance
1. Visual verification of the analog values integrity, such as voltage and current (in
comparison to other devices on the corresponding system).
2. Visual verification of active alarms and LED indications.
3. Visual inspection for any damage, corrosion, dust, or loose wires.
4. Log file download with further events analysis.
1.1.2 Out-of-service maintenance
1. Check wiring connections for firmness.
2. Analog values (currents, voltages) injection test and metering accuracy verification.
Calibrated test equipment is required.
3. Thresholds verification
4. Contact inputs and outputs verification. This test can be conducted by direct change
of state forcing or as part of the system functional testing.
5. Visual inspection for any damage, corrosion, or dust.
6. Log file download with further events analysis.
1.1.3 Unscheduled maintenance (system interruption)
1. View the event recorder, logs and oscillography for correct operation of inputs,
outputs, and elements
1.2 Back up and restore settings
Back up a copy of the in-service settings for each commissioned device, so as to revert
to the commissioned settings after inadvertent, unauthorized, or temporary setting
changes are made, after the settings defaulted due to firmware upgrade, or when the
device has to be replaced. For information on how to download and upload
configurations refer to the Configuration Chapter.
1.3 Measurement Accuracy
If the power system is energised, the measured values can be compared with known
system values to check that they are in the expected range. If they are within a set
range, this indicates that the A/D conversion and the calculations are being performed
correctly.
Alternatively, the measured values can be checked against known values injected into
the device using the test block, (if fitted) or injected directly into the device's terminals..
1.4 Replacing the Unit
If your product should develop a fault while in service, depending on the nature of the
fault, the watchdog contacts will change state and an alarm condition will be flagged. In
the case of a fault, you should normally replace the cradle which slides easily out of the
case. This can be done without disturbing the scheme wiring.