ChapTEr 2: INSTallaTION
35
Power Considerations
The controller has a built-in 2 amp power supply. Each AI device that
is placed on the line has current draw that must be accounted for in
that amperage. Longer lines and more AI devices on the line will also
cause the voltage to drop. Both voltage and amperage requirements
must be accounted for.
Amperage Considerations
Use the chart below to verify that you have enough amps to support
the number of AI devices to be installed. Do NOT exceed 75% of the
rated load for the power supply. It is always better to have a higher
amp power supply than required as electronics only pull the current
that they need. Do not confuse amps with volts, which must not
exceed the specications. If you need assistance calculating your
power needs, please contact Technical Support.
Power Supply Size
in Amps
Actual Amperage
/ Milliamps (mA)
Max. Recommended Limit
(75% Load)
1 A 1.2 A / 1200 mA 900 mA
2 A 3 A / 3000 mA 2250 mA
4 A 5 A / 5000 mA 3750 mA
6 A 7 A / 7000 mA 5250 mA
10 A 10 A / 10000 mA 7500 mA
AI Device Type Current Draw in Milliamps
Keypad or Keypad with Intercom 300 mA **
CodeXpress with Intercom 300 mA **
APEX Access Device 300 mA **
Hardwired Multiplexer (16 - 96 Ch) 300 mA
Wiegand ** 300 mA **
8-Channel Relay Board 500 mA
Wireless Multiplexer 500 mA
HID Proximity Reader 30 - 260+ mA **
KT&C Pinhole Camera (B&W / Color) 100 mA / 240 mA **
RB5 Relay 120 mA
* Do NOT exceed 75% load. This provides a safety zone to allow for most peak usage and
power spikes/surges without locking up or damaging the system.
** When powering other equipment from a device such as a proximity reader or pinhole
camera, be sure to consider the current draw specications from that equipment as well.
Refer to manufacturer specications for verication on current draw.
For best results in most
situations, do not exceed
75% of the amperage load on any
given power supply.
Also, remember that line length,
wire condition, splices, number
of devices connected, humidity,
temperature, and other factors
cause voltage drop; so do not
assume that three 300 mA
devices can be powered from one
1A power supply. Always make it a
point to check the voltage at every
device once the site is completely
up and running to ensure that no
device is below 12V at any time.
For example – 2A power supply
(2250 mA max. load) can support
seven keypads equaling 2100
mA OR four keypads and two
8-channel relay boards totaling
2200 mA. If you wanted to
add any other devices, you
would have to move to the next
larger power supply OR add an
additional 1A power supply. If you
are unsure, always use the next
size larger remote power supply.
It is always better to have more
available amperage than less as
an AI device will only draw to its
capacity and no more.
To Next Page
Loading...
