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Pelco Manual C1456M-D (10/98) 19
Figure 11. Interconnect Circuit Board
Electrical Connections
Figure 10. Transformer Wiring
EXAMPLE:
If each
dome requires 20 vA,
three domes require a
60 vA transformer.
DOME 1
POWER
DOME 2
POWER
DOME 3
POWER
WARNING:
Make sure
you wire power to the
outer connectors of the
terminal block and ground
to the middle connector.
Otherwise, you could
damage the dome.
3.4 BACK BOX CONNECTIONS
Refer to Figure 11 to attach the wiring to the interconnect circuit board inside the
back box. Also refer to Figure 8 if necessary.
1. Earth Ground - Connect earth ground to the middle connector on the power
connector.
2. Power - Connect 24 VAC from the transformer to the outer terminals on the
power connector. It does not matter which lead goes to which terminal.
If you are wiring more than one dome from the same transformer, it is impor-
tant to wire the power connector in each dome the same way. That is, the
wiring from one side of the transformer must be connected to the same con-
nector on each dome. If you reverse the wiring, the cameras will be out of
phase with each other and may produce what appears to be vertical roll when
switching between cameras. Refer to Figure 10 for a wiring diagram.
3. Video - Connect the coaxial cable to the BNC video connector.
4. Control - If you are using a Coaxitron
®
controller, control signals will be trans-
mitted over the video coax.
If you are using RS-422 control signals, connect the control lines from the
controller to the circuit board. Connect the wires as follows:
From controller To 4-Wire terminal on circuit board
RX- TX-
RX+ TX+
TX- RX-
TX+ RX+
HTR/FAN
RX–
RX+
TX–
TX+
PWR IN
FUSE
1.6 A
DOME DRIVE
CONNECTOR
RS-422
CONTROL
SIGNALS
1
2
3
4
5
6
7
GND
NO
COM
NC
AUX 2
GND
ALARMS
RELAY
AUX 1
POWER
(24 VAC ONLY)
FAN
24 VAC
MIDDLE
PIN IS
GND
VIDEO
CONNECTOR
FOR OPTIONAL
TRANSLATOR
SUBASSEMBLY