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.
Figure 13: BAT connector
7.3 Mains Unit NG 12/26 R
Use of the mains unit is recommended for shooting in the studio and
when using electronic accessories with high power consumption.
To power the ALEXA using the Mains Unit NG 12/26 R:
1. Set the correct mains voltage on the mains unit using the fuse on
the back of the unit. For example, set it to 220 V if the AC mains
power source is 220 V.
2. Connect the mains unit to AC mains power.
3. Ensure that the camera power is turned off.
4. Set the voltage switch on the mains unit to 26 V.
5. Connect the battery cable KC-20S or KC-29S (spiral cable) to the
power supply socket on the camera and the 26 V socket on the
mains unit.
Note: The NG 12/24 R was the original design that provided 12 & 24 volts
output – it was superseded by the NG 12/26 R, which outputs 12 & 26 volts. The
NG 12/24 R can easily be upgraded to NG 12/26 R specification at an ARRI
service center.
7.4 Cine-Style Batteries
Any 24 V cine-style battery with a three-pin XLR output can be used to
power the camera through a KC-20S or a KC-29S battery cable.
To connect the battery to the camera:
1. Ensure that the main switch on the camera is off.
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