Logitek Electronic Systems AE-32 Audio Engine - Manual (Page 12)

System Components
Logitek Audio Engine Reference Manual 10
4 System Components
Power Supply Unit
Newer engines contain switching power supplies. These supplies do
not have a fuse under the front panel handles. Switching supplies
automatically adjust to 110 or 220-volt mains power and have no
user replaceable fuse.
Engines prior to June 2003 contain linear power supplies. Linear
supplies have a fuse holder under the front panel handle unless
marked otherwise. These supplies are factory set for 110VAC power.
The unit can be set for 220VAC by changing the switch on the power
supply to the “220VAC” position. This switch is at the lower rear
corner of each power supply module. The 110 Volt position is toward
the bottom of the Engine and the 220-volt position is toward the top
of the Audio Engine. To change the switch, remove the power supply
by loosening the mounting screw in the lower right hand corner of the
module front panel.
If two power supplies are installed, both must be the same type, and the
voltage switch settings must be the same for both units.
When a single power supply is used it should occupy the lower position. When two supplies are
used they share the current demand. If a power supply is removed, the remaining supply carries the
full chassis load. The lower power inlet connects to the lower supply and the upper power inlet
connects to the upper supply.
Each supply has a red LED that lights when it is operating. There are controls on the power supply
that allow local setup and system tests. They are used in conjunction with the LCD display located
below the lower Power Supply position.
 TIP: The use of an uninterruptible power supply (UPS) to power the Audio Engine is
highly recommended to preserve stable operation and to avoid audio interruptions.
Power consumption of the Audio Engine is approximately 110 watts. Size the UPS
according to the length of time needed to protect against outage.
 See Chapter 7 for information on changing fuses in a linear power supply.