KROHNE IFC 210 E-EEx EN - Manual (Page 75)

Part C Special applications, functional checks, service, and order numbers Sect. 8.2
05/2002 IFC 210 E 75
8.2 Replacement of power supply fuse
CAUTION!
The following applies to primary heads in hazardous areas:
Installation, electrical connection, commissioning and maintenance work may only
be carried out by persons who have been trained for work in hazardous areas and
are authorized to do so.
Switch off power supply before starting work
Refer to Sect. 8.1 for Figs. 1 and 2.
1) Unscrew the 4 recessed head screws (S1), on the front (Fig. 1).
2) Carefully remove the plug-in unit from the subassembly support.
3) Detach 4 recessed-head screws (S3) on the rear side of the plug-in unit (Fig. 2).
4) Carefully remove the electronics insert from the plug-in unit.
5) Change power fuse F5 on the “power supply unit“ board (Fig. in Sect. 8.4). For values and
order no., refer to Sect. 9.
6) Reassemble in reverse order, points 4) - 1) above.
8.3 Replacement of electronics unit of signal converter
CAUTION!
The following applies to primary heads in hazardous areas:
Installation, electrical connection, commissioning and maintenance work may only
be carried out by persons who have been trained for work in hazardous areas and
are authorized to do so.
Refer to Sect. 8.1 for Figs. 1 and 2.
1) Unscrew the 4 recessed head screws (S1), on the front (Fig. 1).
2) Carefully remove the plug-in unit from the subassembly support.
3) Detach 4 recessed-head screws (S3) on the rear side of the plug-in unit (Fig. 2).
4) Carefully remove the electronics insert from the plug-in unit.
5) Carefully transpose DATAPROM (IC 4) on conductor side the amplifier-PCB (see Fig. in Sect.
8.4) from the “old” and the “new” electronic unit . Watch the position of the IC 4 when putting it
on.
6) Check the power supply and fuse F5 on the new electronic unit.
7) Reassemble in reverse order, points 4) - 1) above.