ABB 4623, Manual, Page: 13 / 32

11
4.4 Panel-mounted Instrument Connections – Fig. 4.5
✶
Note. Refer to Fig. 4.2 for Access to Terminals.
Caution. Slacken terminal screws fully before making connections.
+
–
Normally Closed
Common
Normally Open
Normally Closed
Common
Normally Open
Neutral
Live
Earth
(Ground)
TBA
Relay 1
Relay 2
1
2
3
4
5
6
7
8
9
E
N
L
1
2
3
4
5
6
7
8
9
10
11
12
Mains Supply
Retransmission
Output
0V
Rx–
Rx+
Tx–
Tx+
Blue
Green/Yellow
Brown
Black
White
Braid
TBB
RS422/RS485
Serial Interface
(If fitted)
Temperature
Compensator
Conductivity Cell
1
2
3
4
5
6
7
8
9
E
N
L
1
2
3
4
5
6
7
8
9
10
11
12
Earth (Ground)Stud
Earth (Ground) Stud
(on case) Earth (Ground) Stud
(on case)
2
nd
Retrans output
(if fitted)
4 –ve
5 +ve
Refer to
Table 4.1
on page 10
for terminal
descriptions
4 ELECTRICAL CONNECTIONS…
Warning. The power supply earth (ground) must be connected to ensure safety to personnel, reduction of the
effects of RFI interference and correct operation of the power supply interference filter. Connect the earth (ground)
lead directly to the case earth (ground) stud and
not to the 'E' terminal.
Caution. The metal braid in the conductivity cell connecting cable must not be earthed (grounded), or
allowed to touch earthed (grounded) components, and must be cut back to the insulation at the conductivity cell end.
✶
Note.
• Metal cells (isolated from earth [ground]), e.g. if mounted in plastic pipe or pocket – connect terminal 9 to earth
(ground).
• Metal cells (earthed [grounded]) – ensure that the cell ground potential and that of the instrument's earth (ground)
stud are the same.
Fig. 4.5 Panel-mounted Instrument Connections