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.
