Important – KROHNE ALTOFLUX IFM 4080 K EEx EN User Manual

Page 17

4.1.1 Replacement of electronics unit

Refer to the standard Installation and Operating Instructions for detailed information about
resetting and reprogramming the new electronics unit after replacement. The customer
specific data (like the value of the internal totalizer) are stored in DATAPROM IC-18, which
must be transferred from the "old" to the "new" electronics unit. See Section 8.7 of the
standard Installation and Operating Instructions for detailed information.

Figure 10: Display unit of IFC 090…-EEx.

Before commencing work,

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

Then continue as follows:

1. Remove the display cover of the electronics compartment.
2. Unscrew the two screws A of the display unit (see figure 10) and turn it carefully aside.
3. Disconnect the 2-pole field circuit connector (item B in figure 9) and the 3-pole electrode

circuit connector (item C). Also see figure 11 on the next page.

4. Unscrew the two mounting screws D of the electronics unit and screw SE, which fixes the

copper earth strip to the back of the housing. A screwdriver with a long shaft (

≥

200 mm)

is most suitable for unscrewing screw SE (e.g. screwdriver type Philips No. 2 ).

5. Carefully remove the electronics unit of the converter housing (see the remark below).
6. Check if the voltage setting (only applicable for AC power supplies) and power fuse rating

are correct on the new electronics unit. If necessary, change the voltage setting or
replace the power fuse (see section 3.1.3 resp. 3.1.2 of this manual).

7. Carefully insert the electronics unit (keep cables aside, see remark below). Then mount

the unit completely into the housing and fix the screws. First the two screws D, then
screw SE and reconnect the 2-pole field circuit connector B and the 3-pole electrode
circuit connector C to the right counter-plugs on the electronics unit (see also figure 9).

8. Finally screw the display unit back on the frame of the electronics via the two screws A.
9. Screw the cover of the electronics compartment back into the housing.

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

IMPORTANT !

Carefully keep the connecting cables of the field coil and electrode circuits to the side of
the housing, while removing respectively inserting the electronics unit into the signal
converter housing. This is to prevent damaging of the connecting cables !