F1 f2 – KROHNE ALTOFLUX IFM 4080 K EEx EN User Manual

Page 19

Figure 12: IFC 090-EEx electronics unit with 24 Vac/dc power supply.

Regular IFC 090-EEx with 100…230 Vac power supply

Before commencing work,

note the instructions in Section 3.1 ("Before opening")

Then continue as follows:

1. Remove the cover of the electronics compartment.
2. Unscrew the two screws A of the display unit and turn the display unit carefully aside.
3. The fuse-holder, in which the power fuse in accordance with IEC 127-2 size Ø5 x 20 mm

is mounted, is now accessible to replace the defect power fuse F1 by a new fuse with the
same rating. The rating depends on the voltage setting of the power supply unit. The
power supply of 100/115 Vac requires a fuse of T200mA (part No. 5.05678.00.00) and
the 200/230 Vac requires a fuse of T125mA (part No. 5.06627.00.00).

The fuse rating is also shown by the yellow sticker that is glued on the mains transformer,
which can only be seen after the regular IFC 090-EEx electronics unit is completely
removed from the flameproof signal converter housing. See figure 13 on the next page.

NOTE:

In case of any doubt about the fuse rating or the voltage setting of the unit, remove the
complete unit from the housing as described in section 3.1.1 on page 16 and check
the in figure 13 (on the next page) depicted items. Change when needed !

4. Reassemble the unit in reverse order (points 2 and 1).

Note the instructions of section 3.1 ("After opening") during reassembling.

Power fuses F1 and F2

(see detail on the right)