ABB Navigator 550, Процедуры замены, Страница: 3 / 8

4 Replacement procedures
Navigator 550 | Low level dissolved oxygen wet-section | Spares replacement procedures | INF12/113–EN Rev. C 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
washers
A
and remove the PCB cover
B
.
2. If replacing PCB housing seals, remove and discard housing
seal
C
.
3. Disconnect all cables from the PCB
D
, loosen all cable
glands and remove cables.
4. Remove and retain the 4 PCB housing fixing screws and
washers
E
and remove the PCB housing
F
.
5. If replacing PCB housing seals, lift PCB housing seal
G
out
of the groove and discard.
6. Remove and retain the 2 PCB fixing screws and washers
H
and remove the PCB
D
. If replacing PCB housing seals, fit
the new (large) PCB housing seal
G
in the groove (a small
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
H
.
8. Refit the PCB housing
E
using the 4 PCB housing fixing
screws and washers
D
.
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
housing seal
C
between the PCB cover
B
and PCB
housing
F
(a small amount of silicone sealant or grease can
be used to help retain the seal in place).
11. Refit the PCB cover
B
using the 4 PCB cover fixing screws
and washers
A
, ensuring PCB housing seal
C
is located
correctly in its groove.
4.2 Replacing the tundish assembly
Part number: AW502 065
Referring to Fig. 4.4:
1. Rotate the sample outlet tube
A
until the open end is free of
the tundish assembly
B
.
2. Disconnect the drain tube
C
from the tundish assembly
B
.
3. Unscrew and remove the 2 tundish retaining screws
D
taking care to retain the spacers
E
located between the rear
of the tundish assembly and the main case.
4. Remove the old tundish assembly
B
and fit the new tundish
assembly in the reverse order of removal.
Fig. 4.2 Replacing the PCB housing seals, PCB cover and PCB
Fig. 4.3 Wet section PCB cable entries
Entry Cable Color Terminal Description
1
Serial (Modbus) – refer
Operating Instructions
(OI/ADS550-EN) for
multiple wet-section
setup.
Red
Black
Green
White
Screen R
B
G
W
SCR 24 V
0 V
Data +ve
Data –ve
Screen
2
Drain valve
Red
Black 9
10 +ve
–ve
3
Flowmeter (if fitted)
Red
Brown
Black 13
15
17 +ve
GND
–ve
4
Sensor block
Blue
Red
Black
Yellow 31
32
33
35 +ve
–ve
Pt1000
Pt1000
Table 4.1 Wet-section cable terminal connections
Fig. 4.4 Replacing the tundish assembly
B R
Scr
G W
1 3 5 7 9 1 1 13 15 17 19 21 23 25 27 29 31 33 3
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36
2 3 4
1
Additional
'daisy-chain'
cable
connections