ABB 4680 Installation & Operating Manual page 11

...4.2 Wall-mounted Instrument Connections – Figs. 4.2 and 4.3
1 2 3 4
Channel
1
Channel 1
+
1 Cell retransmission
input (output
2 – from Interface
Electronics Unit)
3 —
4 —
Sleeved Links
Warning. The power supply earth (ground) must be connected to ensure safety to personnel, reduction of the
effects of radio frequency interference (RFI) and correct operation of the power supply interference filter.
1 2 3
5 6 7
4 5
Channel Serial
(If fitted)
2
Channel 2
Logic 1
5 —
2
6 — temperature
input (alarm 3
7 —
4
from Interface
Electronics 5
Unit) 6
Rx
Tx
Fig. 4.3 Wall-mounted Instrument Connections
4 ELECTRICAL CONNECTIONS...
+ –
6
Retrans.
Serial Retransmission
RS422/
Output
RS485
— Retrans.
+
— Rx+
Output
— Rx–
— Tx+
— Tx–
— 0V
=
Receive
Transmit
=
1 2 3
N L
4 5 6
Relay 1 Power
Relay 2 Supply
Relay 1
Relay 2
1 — NC
2 — C
Relay 1
3 — NO
4 — NC
5 — C Relay 2
6 — NO
Earth Stud (on case)
– see Fig. 4.2
=
NC Normally Closed
C Common
=
NO Normally Open
Power
Supply
N — Neutral
L — Line
— Earth
9