ABB Navigator 550 Spares Replacement Procedures page 2

3.1 Replacing the PCB housing seals, PCB cover and PCB
Part numbers:

PCB housing seals: AW503 051

PCB cover: AW503 052

PCB: AW503 050
Referring to Fig. 3.2:
1. Remove and retain the 4 PCB cover fixing screws and
A
washers and remove the PCB cover
2. If replacing PCB housing seals, remove and discard housing
C
seal .
3. Disconnect all cables from the PCB
glands and remove cables.
4. Remove and retain the 4 PCB housing fixing screws and
E
washers and remove the PCB housing
5. If replacing PCB housing seals, lift PCB housing seal
of the groove and discard.
6. Remove and retain the 2 PCB fixing screws and washers
and remove the PCB
the new (large) PCB housing seal
amount of silicone sealant or grease can be used to help
retain the seal in place).
7. Fit the new PCB to the rear of the main case using the 2 PCB
retaining screws and washers
8. Refit the PCB housing
D
screws and washers
Referring to Fig. 3.3 and Table 3.1 for terminal connection details:
9. Make cable connections at the new PCB.
Referring to Fig. 3.2:
10. If replacing PCB housing seals, fit the new (small) PCB
C
housing seal between the PCB cover
F
housing (a small amount of silicone sealant or grease can
be used to help retain the seal in place).
B
11. Refit the PCB cover
A
and washers , ensuring PCB housing seal
correctly in its groove.
Fig. 3.2 Replacing the PCB housing seals, PCB cover and PCB
1
B R
G W
2
Fig. 3.3 Wet section PCB cable entries
2 INF13/114–EN | Navigator 550 | Hydrazine wet-section | Spares replacement procedures
B
.
D
, loosen all cable
F
.
D
. If replacing PCB housing seals, fit
G
in the groove (a small
H
.
E
using the 4 PCB housing fixing
.
B
using the 4 PCB cover fixing screws
C
1 3 5 7 9 1 1 13 15 17 19 21 23 25 27 29 31 33 3
Scr
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36
3
Entry Cable
Serial (Modbus) – refer to
Operating Instructions
1
(OI/AHM550-EN)
multiple wet-section
setup.
2
Sensor block
3
Pressure switch
Calibration
4
valve
5
Flowmeter (if fitted)
G
out
Table 3.1 Wet-section cable terminal connections
H
3.2 Replacing the flowmeter assembly and flowmeter cable
Part numbers:

Flowmeter: AW503 068

Flowmeter cable: AW503 086
Referring to Fig. 3.4:
1. Disconnect the flowmeter cable
remove the sample inlet tubing
D
spigot
disconnection details and remove / discard the cable.
2. Disconnect the flowmeter
above the flowmeter by pressing the ring and pulling the
and PCB
flowmeter away.
3. Fit the new flowmeter / cable in the reverse order of removal.
is located
Fig. 3.4 Replacing the flowmeter assembly and flowmeter cable
5
4
3 Replacement procedures
Color Terminal
Red R
Black B
for Green G
White W
Screen SCR
Blue 31
Red 32
33
Black
35
Yellow
Red 25
Black 26
Red 9
Black 10
Red 13
Brown 15
Black 17
A
from the flowmeter
C
from the flowmeter inlet
. If replacing cable(s), refer to Section 3.1 for cable
B
from the QD connector
Description
24 V
0 V
Data +ve
Data –ve
Screen
+ve
–ve
Pt1000
Pt1000
N/A
N/A
+ve
–ve
+ve
GND
–ve
B
.
E