checking the circuit breaker maintenance counters. For this reason, maintenance checks should also
be performed locally at the substation.
Caution: Before carrying out any work on the equipment you should be
familiar with the contents of the Safety Section or the Safety
Guide Pxxx-SG-4LM-1 and the ratings on the equipment’s
rating label.
Opto-Isolators
Check the opto-inputs by repeating the commissioning test detailed in the Commissioning chapter.
Output Relays
Check the output relays by repeating the commissioning test detailed in the Commissioning chapter.
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. Suitable test methods can be found in
Commissioning chapter.
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 IED's terminals. These tests will prove the
calibration accuracy is being maintained.
Replacing the Unit
If your product should develop a fault while in service, depending on the nature of the fault, the error
codes will be generated which can be viewed on the relay HMI. First step is to take actions as
suggested in the Troubleshooting section of this manual. In the unlikely event that the problem persist
or lies with the wiring and/or terminals, then you must replace the complete device, rewire and re-
commission the device.
Once the unit has been reinstalled, it should be re-commissioned.
Caution: If the repair is not performed by an approved service centre,
the warranty will be invalidated.
Caution: Before carrying out any work on the equipment, you should
be familiar with the contents of the Safety Information section of this
guide or the Safety Guide Pxxx-SG-4LM-1 as well as the ratings on
the equipment’s rating label. This should ensure that no damage
is caused by incorrect handling of the electronic components.
Warning: Before working at the rear of the unit, isolate all voltage and
current supplying it.
Note: P15D does not support automatic current transformer shorting .Hence for safety reasons, CT
terminals to be shorted when the terminal block is removed.
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