152 MPA2C3 Installation Guide
Example:
If the total current consumption of your external devices exceeds the 1600 mA
maximum current, use one of the following system configurations:
• 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.
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:
• 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.
Device Element Current
Panel Power Consumption 250 mA
Door strike or magnetic lock
current
600 mA
Reader A maximum current 100 mA
Reader B maximum current 100 mA
Buzzer or sounder current 20 mA
Door position switch 20 mA
Request to exit switch 30 mA
Total current for
this example
1120 mA
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