Figure 1-34 Alarm Out Connections
The alarm provides the relay output, and the external power supply is required when it connects to
the alarm device.
For DC power supply (left diagram), the input voltage must be no more than 30VDC, 1A.
For AC power supply, the external relay must be used (right diagram) to prevent damages to the
speed dome and avoid risk of electric shock.
1.3 Power Supply
1.3.1 Power Cable Requirement
When the speed dome uses standard AC power supply, the power cable should meet the demand.
The formula of the cross-section S (mm²) and the maximum transmission distance L (m) of the bare
wire is as follows:
L=50*S (analog speed dome)
L=40*S (network speed dome)
Example:
For the analog speed dome, the cross-section of the cable is 1mm² and the transmission distance is
less than 50m.
According to the Appendix 4 24VAC Wire Gauge Standards, for example, the American wire gauge
18, the transmission distance should be 0.7854*50=39.27m.
1.3.2 Power over Hi-PoE
Power supply via Hi-PoE is supported by some speed dome series. The Hi-PoE module connection is
shown below.
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General
Weight and Dimensions
