ABB Navigator 550 Replacement Procedures page 3

4.1 Replacing the PCB housing seals, PCB cover and PCB
Part numbers:

PCB housing seals: AW502 051

PCB cover: AW502 052

PCB: AW502 050
Referring to Fig. 4.2:
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. 4.3 and Table 4.1 for terminal connection details:
9. Make cable connections at the new PCB.
Referring to Fig. 4.2:
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. 4.2 Replacing the PCB housing seals, PCB cover and PCB
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
Navigator 550 | Low level dissolved oxygen wet-section | Spares replacement procedures | INF12/113–EN Rev. C
1
Fig. 4.3 Wet section PCB cable entries
Entry Cable
G
out
Serial (Modbus) – refer
Operating Instructions
1
(OI/ADS550-EN)
H
multiple wet-section
setup.
2
Drain valve
3
Flowmeter (if fitted)
4
Sensor block
Table 4.1 Wet-section cable terminal connections
4.2 Replacing the tundish assembly
and PCB
Part number: AW502 065
Referring to Fig. 4.4:
1. Rotate the sample outlet tube
is located
the tundish assembly
2. Disconnect the drain tube
3. Unscrew and remove the 2 tundish retaining screws
taking care to retain the spacers
of the tundish assembly and the main case.
4. Remove the old tundish assembly
assembly in the reverse order of removal.
Fig. 4.4 Replacing the tundish assembly
4 Replacement procedures
B R Scr 1 3 5 7 9 1 1 13 15 17 19 21 23 25 27 29 31 33 3
G W
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36
2 3
Color Terminal Description
Red R 24 V
Black B 0 V
for Green G Data +ve
White W Data –ve
Screen SCR Screen
Red 9 +ve
Black 10 –ve
Red 13 +ve
Brown 15 GND
Black 17 –ve
Blue 31 +ve
–ve
Red 32
Pt1000
Black 33
Pt1000
Yellow 35
A
until the open end is free of
B
.
C
from the tundish assembly
E
located between the rear
B
and fit the new tundish
4
B
.
D
3