Electrical Connections - Wet-Section; Accessing The Wet-Section Pcb - ABB Navigator 550 Operating Instructions Manual

Navigator 500
Hydrazine analyzer
3.4 Electrical connections – wet-section

3.4.1 Accessing the wet-section PCB

This section is applicable only for multiple wet-section systems.
Note.

For single wet-section systems, the Modbus cable is connected to the wet-section at the factory – only transmitter
connections are required.

If additional wet-sections are added they must be connected in series – refer to Appendix B, page 67.

The following procedure is required only when connecting additional wet-sections to an existing analyzer.
Warning. Isolate power supplies to the transmitter and wet-section before attempting to access the wet-section PCB.
Referring to Fig. 3.11:
1. Open the wet-section door by releasing the 2 door locks
2. Remove the 4 screws
remove the cover.
3. Feed the supplied communications cable through the channel in the rear corner of the main case (as fitted cable), then through
the cable gland and make the connections shown in Fig. 3.12, page 15.
Note. When refitting the cover, ensure that the O-ring seal
Fig. 3.11 Accessing the wet-section PCB
14
B
and associated plastic screw retaining washers
B B
A A
A
.
C
holding the wet-section PCB cover in place and
D
in the PCB housing is located correctly in its groove.
OI/AHM550–EN Rev. A