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24 Power Supply
8 Power Supply
•
Use only ARRI-recommended power supply solutions.
•
Manipulation of power supplies could result in serious injury or death, or damage
to the ALEXA.
The ALEXA accepts an input voltage range from 10.5 to 34 V DC. Do not supply
power outside the specified voltage range. The camera can be powered through the
BAT connector or battery adapters accepting V-Lock or Gold Mount batteries.
The power supply should deliver an output of more than 90 W to power the camera
sufficiently. The power draw of the camera in basic configuration is about 85 W.
A 12 to 15 V battery should have at least 6 A maximum output current.
NOTICE
•
When powering accessories through the camera, the total power draw of the
camera is increased by the amount of power drawn by the accessories.
•
Always keep the BAT connector or attached battery accessible so that they can
be unplugged quickly in case of emergency.
8.1 Power Management
When using the BAT connector and one or more onboard battery adapters
simultaneously, the camera’s power management system ensures that the power
source with the highest voltage level is used. When the voltage level of one power
source drops below the level of the other, or a power source is disconnected from the
camera, the power management system automatically switches to the other power
source, avoiding shutdown of the camera.
For example, a 12 V onboard battery can be used as backup for the main 24 V battery.
Using a 12 V onboard battery in addition to the main 24 V battery also allows for quick
switchover to handheld mode—the power cable can simply be disconnected from the
BAT connector.
When using two onboard battery adapters (with batteries in parallel—one on top and
one on the back), the camera will treat them as a single source. When used this way,
the load is spread across two batteries, creating a strong power source.
8.2 BAT Connector
The BAT connector is the primary power input on the ALEXA. It is a Fischer 2-pin
socket located at the back of the camera on the camera-right side.
The socket accepts power cables KC-20S and KC-29S. The cables can either be
connected to the mains unit NG 12/26R or to 24 V cine-style batteries with three-pin
XLR outputs. Do not use cables longer than 4m.
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