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Door station/power supply units
18
TwinBus extension unit 1 4923
Expansion unit 1 4923 is used to expand built-in loudspeaker 1 4921. It allows an additional 12 bell buttons to be
connected.
* Please note the red mark – see “Bus connections in the door station” on page
☞
16
.
* Please note the red mark – see “Bus connections in the door station” on page
☞
16
.
Circuit diagram:
Connection of the expansion unit
Note:
Customer-installed illumination up to max. 11 V / 1.6 A can be connected to terminals 3 and 4 on
power supply unit 1 7573. If long lines are used or the connections are not suitable, care must be
taken to ensure the voltage on built-in loudspeaker 1 4921 on terminals 3 and 4 is not less than 10 V.
4
3
5
1
2
00279-0
1
KK1
K2K3
K4K5
K6K7
K8K9
1011
12
4
3
2
1
00213-0
2
S0045-2
1 4921
4
3
2
1
K2 K3 K4 K5 K6 K7 K8 K9
K1
K
11 12
10
KL1
KL2
KL3
KL4
KL5
KL12
K2 K3 K4 K5 K6 K7 K8 K9
K1
K
11 12
10
KL13
KL14
KL15
KL16
KL17
KL24
1 4923
