ALLEN & HEATH DR128 User's Guide download pdf (Page 15)

DR66 & DR128 Installer User Guide 15

Connecting Mains Power

Before starting check that the mains voltage setting on the DR unit is correctly set for the local

mains supply. Check that the correct mains lead with moulded mains plug and IEC connector has

been supplied with your unit.

It is advised to turn connected power amplifiers down or off before switching the DR unit on or off.

Ensure that the IEC mains plug is pressed fully into the rear panel socket before switching on.

Connecting a DC Supply

A 24 Volt DC backup supply such as a battery may be connected so that the unit remains powered

in the event of a mains power failure. This switches in automatically when the mains voltage falls

below a certain level.

DR66 A 24V +/-15% 1.5A supply is required.

Maximum power consumption is 25VA. An internal 20mm

2A anti-surge protection fuse is fitted. Connect the DC

supply –V (negative) cable to the BATTERY/REMOTE D-

type connector pins 23 and 24. Connect the +V (positive)

cable to pins 20 and 21. Use suitably rated cable and

observe the correct polarity.

DR128 A 24V +/-15% 3A supply is required. Maximum power consumption is

70VA. An internal 20mm 5A anti-surge protection fuse is fitted. Connect the DC

supply –V (negative) cable to the 0V terminal and the +V (positive) cable to the

+24V terminal. Use suitably rated cable and observe the correct polarity.

The DC power input is protected by an internal fuse to prevent damage if the unit is

connected to the wrong type or reversed polarity supply. The fuse is located on the

PSU circuit board. For access, remove the top cover.

BATTERY / REMOTE

Batt -V

Pin 23,24

Batt +V

Pin 20,21

WARNING: Remove all power to the unit when replacing the fuse.

WARNING: Read and understand the warnings and instructions printed at

the start of this user guide and on the rear panel.

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ALLEN & HEATH DR128 User's Guide Page 15