Pelco C3420M User Manual
INSTALLATION
Heavy-Duty
®
Spectra® IV Series
Pendant Back Box
C3420M (8/06)
Installation
1
3
2
2 C3420M (8/06)
1. Install the mount for the pendant dome. Refer to the instructions supplied with the mount. If the mount is outdoors,
make sure it is properly sealed to keep moisture out.
2. Open the hinged door to the back box. Push the tab lock towards the wall of the unit and lift the door open.
Pull wiring into the back box. Refer to Table A, Table B, and Table C for wiring distances.
3. Screw the back box onto the mount. If outdoors, apply thread compound (provided) to the threads on the back box.
NOTE: Thread compound must be applied. Not doing so may prevent the units from being separated in the future.
.
Table A. Video Coaxial Cable
Requirements
Cable Type* Maximum Distance
RG59/U 750 ft (229 m)
The following are the recommended maximum distances for 24 VAC
and 24 VDC applications and are calculated with a 10 percent voltage
drop. (Ten percent is generally the maximum allowable voltage drop
for AC- or DC-powered devices.)
Table B. 24 VAC/24VDC Wiring Distances
RG6/U 1,000 ft (305 m)
)
Wire Gauge
18 AWG
(1.0 mm2)
196 ft
(60 m)
62 ft
(19 m)
16 AWG
(1.5 mm2)
311 ft
(95 m)
98 ft
(30 m)
14 AWG
(2.5 mm2)
495 ft
(151 m)
156 ft
(48 m)
RG11/U 1,500 ft (457 m)
*Cable requirements:
75 ohms impedance
All-copper center conductor
All-copper braided shield with 95% braid
coverage
AC/DC
Tot a l VA/
Total Watts
23 VA/
15 watts
73 VA/
65 watts
20 AWG
(0.5 mm
123 ft
(38 m)
39 ft
(12 m)
2
NOTE: Input power for the dome is 24 VAC or 24 VDC. Using 24 VAC input power, power consumption is 23 VA per dome
for indoor models and 73 VA for outdoor models. Using 24 VDC input power, power consumption is 0.7 A (15 watts) for
indoor models and 3 A (65 watts) for outdoor models.
Use a 24 VAC trasnformer with the following minimum VA:
40 VA per dome For indoor models (without heater)
100 VA per dome For outdoor models (with heater)
.
Table C. UTP Wiring Distances
Receiver Maximum Distance
Active
(Video Only)
Passive
(Video, Coaxitron, Pelco V-Sync)
0-3,000 ft
(0-914.4 m)
0-750 ft
(0-228.6 m)
NOTE: As a minimum, UTP requires Cat5, 100-ohm twisted pair cable
C3420M (8/06) 3
1
GND
NO
COM
NC
AUX2
GND
2
3
4
5
6
7
VIDEO
UTP+ UTP-RX- RX- TX-TX-PWR- PWR+GND
4
ALARMS
AUX1
5
4 C3420M (8/06)
WARNING: An electrical short in the back box may occur if the metal BNC connector is not completely covered by
the protective boot.
4. Connect wiring to the circuit board inside the back box. When finished, close the door to the back box and turn on the
power. The green LED will light.
NOTES:
• Aux 1: Maximum 2 A at low voltage (<40 V)
Aux 2: Maximum 30 mA at 32 VDC
• If you are using both unshielded twisted pair (UTP) wiring and a translator board, install the UTP wiring before
installing the translator board.
• If you are installing an environmental back box in a railway application, attach a ground wire from the circuit
board power connector to a structural ground using at least 18-gauge wire.
5. Attach the back box leash to the lower dome.
C3420M (8/06) 5
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