Areva MiCOM P341 - Page 83

Operation Guide P341/EN O/B11
Commissioning and CHAPTER 3
Maintenance Page 29/80
MiCOM P341
8.3.2.2 Replacement of the IRIG-B board
Depending on the model number of the relay, the IRIG-B board may have
connections for IRIG-B signals, IEC 60870-5-103 (VDEW) communications, both or
not be present at all.
To replace a faulty board, disconnect all IRIG-B and/or IEC60870-5-103 connections
at the rear of the relay.
The board is secured in the case by two screws accessible from the rear of the relay,
one at the top and another at the bottom, as shown in Figure 6. Remove these
screws carefully as they are not captive in the rear panel of the relay.
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F
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TX
IRIG-B
RX
PORT 1
Figure 6: Location of securing screws for IRIG-B board
Gently pull the IRIG-B board forward and out of the case.
To help identify that the correct board has been removed, Figure 7 illustrates the
layout of the IRIG-B board with both IRIG-B and IEC60870-5-103 options fitted
(ZN0007 003). The other versions (ZN0007 001 and ZN0007 002) use the same
PCB layout but have less components fitted.