Pelco Manual C1487M-C (7/99) 13
BACK BOX CONNECTIONS
Refer to Figure 12 or 13 to attach the wiring to the interconnect circuit board inside the back
box. Also refer to Figure 8 or 9 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 important 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 connector 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 11 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 transmitted
over the video coax.
If you are using RS-422 (P or D) 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+
Figure 11. Transformer
Wiring
EXAMPLE:
If each dome
requires 30 vA, three domes
require a transformer with a
minimum output of 120 vA
(refer to the
Wiring
section
for transformer require-
ments).
DOME 1
POWER
DOME 2
POWER
DOME 3
POWER
WARNING
:
Make sure you
wire power to the outer con-
nectors of the terminal block
and ground to the middle
connector. Otherwise, you
could damage the dome.
Figure 12. Interconnect Circuit Board Electrical Connections for Spectra II™
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 V A C ONLY)
FAN
24 VAC
MIDDLE
PIN IS
GND
VIDEO
CONNECTOR
FOR OPTIONAL
TRANSLATOR
SUBASSEMBLY