16 Pelco Manual C1456M-D (10/98)

Figure 8. Wiring Diagram

NOTE:

The dome will stop oper-

ating if the voltage at the dome

drops below 18 VAC. It will turn

back on when the voltage exceeds

18 VAC.

3.2 WIRING
Bring wiring to the back box opening in the ceiling. Do not attach the wiring to the
back box. You will do that later.
Refer to Figure 8 for the wiring diagram.
Wiring is required for power, earth ground, and video.
Refer to Table A for the type of video coaxial cable to use.
Input power for the dome is 24 VAC only. Power consumption is 25 vA per dome for
indoor models and 90 vA for outdoor models. Refer to Table B to determine the size
of wire to use.
Use a 24 VAC transformer with the following minimum vA:
30 vA per dome For indoor models (without heater)
100 vA per dome For outdoor models (with heater)
Refer to Figure 10 for wiring multiple domes from the same transformer.
If you are using a Coaxitron® controller, the control signals to operate the dome
drive will be transmitted over the video coax. The RS-422 control lines are not used.
If you are not using a Coaxitron® controller, use the RS-422 control lines. Use 22-
gauge wire. The distance will be the same as the video coax.
Optional wiring may be provided for alarm inputs (maximum of seven), relay output,
and auxiliary output.
Proceed to Section 3.3, BACK BOX INSTALLATION.
CONTROL
(RS-422)
7
+5 to +24 VDC
EXTERNAL RELAY
(WIRING EXAMPLE)
SPECTRA
®
(VERSION 3.0) INTERCONNECT BOARD