User Manual

Power Supply 25
Fig. 1: BAT connector
8.3 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.
NOTICE
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superseded by the NG 12/26 R, which outputs 12 & 26 volts.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.
8.4 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.
2. Connect the battery cable KC-20S or KC-29S (spiral cable) to the power supply
socket on the camera and the 28V output on the battery.
NOTICE
When the battery voltage drops below the warning level, the BAT1 level in the
camera display will start flashing. A white i will appear, signaling more information
is available on the INFO screen. For more information on setting the low battery
warning level, see Menu>System>Power (on page 110).