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Example:
Device Element
Panel Power Consumption
Door strike or magnetic lock
current
Reader A maximum current
Reader B maximum current
Buzzer or sounder current
Door position switch
Request to exit switch
Total current for
this example
If the total current consumption of your external devices exceeds the 1600 mA
maximum current, use one of the following system configurations:
•
•
The maximum power available in the 802.3 at standard is 25.5W. This limit is gener-
ally at 42.5 – 57 VDC, and it is measured at the output of the power injector or PoE
switch. Line losses cause a decrease in the power available at the panel when you
use longer Ethernet cable. You can minimize these line losses by using either of the
following methods:
•
•
152
Power the panel with an external power supply.
Power some or all the external devices with an external power supply to lower the
total external current powered by the panel below 1600 mA.
Connecting the MPA2C3 panel to the power injector (Midspan) or PoE+ switch
with the shortest possible Ethernet cable length.
Midspan power supply, also known as a PoE+ power injector, is an additional
PoE+ power. Class 4 can only be used by IEEE 802.3at (Type 2) devices, requiring
valid Class 2 and Mark 2 currents for the power up stages.
Current
250 mA
600 mA
100 mA
100 mA
20 mA
20 mA
30 mA
1120 mA
MPA2C3 Installation Guide
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