Connecting; Control Circuit - ABB OTM_C Series Installation And Operating Instruction

5. Connecting

Only an authorised electrician may perform the electrical installation and
maintenance of motorized change-over switches. Do not attempt any installation
or maintenance actions when a motorized change-over switch is connected to the
electrical mains. Before starting work, make sure that the change-over switch is de-
energised.

5.1 Control circuit

LINE
3
11 14 12 23 24
M
PE N L
F 2
2
1
24 vdc
Do not connect to
any power supply
A B
Figure 5.1 Motorized change-over switch terminals
1. Terminal for motor operator voltage supply
2. Control terminal for push buttons or selector switch
3. Terminal for state information of locking
Do not couple power for the control terminal. See the correct terminal for the
power supply in Figure 5.1
The control voltage (output C = 24Vdc) on the control terminal is non-isolated, see
box 2 in Figure 5.1
When relay outputs are used with inductive loads (such as relays, contactors and
motors), they must be protected from voltage spikes using varistors, RC-protectors
(AC current) or DC current diodes (DC current).
1SCC303002M0206 l ABB Installation and operating instructions, 34OTM_C rev. F l 19
LINE
LOAD
C
1
F 2
L
P E N
+
-
3
1 4
1 1
M M M M
M an . M an .
M an .
2
C
5. Connecting
2 4
1 2
2 3
0
I
I I