KROHNE IFC 090 Converter EN - Manual (Page 67)

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IFC 080 and SC 80 AS: Replacement of electronic unit by IFC 090 8.8
Replacement not allowed on flowmeters of hazardous-duty design !
Please consult factory.
Before dismantling the old electronic unit, please note down all converter settings and use these for
the new unit after it has been installed.
Switch off power source before opening the housing !
1) Unscrew the cover from the terminal compartment using the special wrench and
disconnect all cables from the terminals; note down terminal assignment beforehand.
2) Unscrew the cover from the electronic compartment using the special wrench.
3) Detach the two screws R and fold display unit to the side.
4) Carefully pull off the two blue plugs: 2-pin field power cable and 5-pin signal cable
(forming connection to primary head).
5) Unscrew the 2 recessed head screws Q (size 2 screwdriver, blade length 200 mm / 8”)
and pull out “old” electronic unit.
6) On the new electronic unit check supply power and fuse F1 and change over/replace
if necessary, refer to Sect. 8.2, points 6) and 7).
7) Pull off the two plugs for power (3-pin) and outputs/inputs (6-pin) and carefully insert
the new electronic unit into the housing.
8) Detach the two screws R and fold display unit to the side.
9) Secure the electronic unit with the two screws Q.
10) On the amplifier PCB (see illustration in Sect. 8.9), insert the 2-pin plug of the field
power cable into plug connector X1 and the 5-pin plug of the signal cable into plug
connector X4. Do not kink or twist the cables.
11) Secure the display unit with screws R.
12) In the terminal compartment, press the supplied cover for the terminals into the housing
and connect the cables to the plugs (3-pin for supply power, 6-pin for inputs/outputs).
Ensure terminal assignment is correct, see Sect. 2.
Subsequently insert the plugs into connectors X3 (supply power) and X5 (outputs/inputs).
13) Replace the cover of the terminal compartment and secure using the special wrench.
14) Switch on the power. Check all settings and change if necessary. For setting and
operator control, refer to Sect. 4 and 5. Set the GK value (or 1/2
x GKL value) for the
IFC 090, see instrument nameplate.
15) Subsequently be sure to check the zero, as described in Sect. 7.1.
16) Replace cover on the electronic compartment and secure using the special wrench.
C Ribbon cable, display unit
L Status LED
LP-A Amplifier board, see Sect. 8.9
LP-P Power supply board, see Sect. 8.9
Q Fastening screws, electronic unit
R Fastening screws, display unit
X1 2-pin connector, field power
X2 5-pin connector, IMoCom bus
X4 5-pin connector, electrode signals
X6 10-pin connector, display unit
IMPORTANT !
The screw threads and gaskets of both
housing covers should be well greased at
all times, always check for signs of damage
and never allow dirt to accumulate.
Replace defective gaskets immediately.
R
Q
LP-P
F1
LP-A
X4
X1
X2
X6
L
C