ABB Welcome IP, Системное руководство

Страница: 7 / 82

Overview of product range
System Manual 2CKA000073B9795 │7
2.2 Selection of the correct PoE (commercially available)
For the selection of a PoE switch please observe the following points:
■
All ABB-Welcome IP devices "meet“ standard IEEE802.3af
■
According to IEEE802.3af the PoE loads may each "draw" a maximum of 12.95 Watt.
■
The minimum band width amounts to 100 Mbps.
■
ABB-Welcome IP devices must be operated with a PoE switch that meets standard 802.3af.
– During selection observe that the absolute output on the PoE switch is adequate for all
devices to be connected. Do not load the PoE switch to its limit. Include a power buffer
of at least 20% when calculating the total output.
Example for the selection of a PoE switch
Current (A)
Power (W) per
necessary port
Number of
devices
Total output (W)
IP touch 7"
0.3 8.1 6 48.6
IP touch 5"
outdoor station
0.4 10.8 1 10.80
Guard unit
0.085 2.295 1 2.30
Smart Access
Point Pro
0.375 10.125 1 10.13
IP actuator
0.03 0.81 1 0.81
10 88.57
Table 2: Determination of total output of the devices to be connected
Result
Number of necessary ports: 10
Necessary total output: 88.57 W
Table 3: Result of total output of the devices to be connected
Switch selection
IEEE802.3af
ready
Total output Number of ports
Difference
(Output to
necessary output)
Example of switch
1
Yes 76 10 -12.57 W
Example of switch
2
Yes 112 10 23.34 W
Table 4: Examples of switches
■
The example of switch 1 is not sufficient for requirements. Its total output is too small.
■
The example of switch 2 meets the requirements and can be used.