3. Warnings
20
D SERIES Lake Quick Start Guide rev 3.0.4
8. Cooling and fan operation
8. Cooling and fan operation
D Series devices use a forced-air cooling system with air
Å
ow from front to rear, allowing high continuous power
levels without thermal problems. To facilitate maximum air
Å
ow, ensure that no objects such as rack doors or
lids are placed at the front or rear of the rack. Never attempt to reverse the air
Å
ow. Make sure an adequate air
supply is provided in front of the D Series device, and that the rear of the device has suf
Ä
cient space to allow
air to escape. It is recommended to keep the ambient temperature around the device as cool as possible. An
increased temperature can have a signi
Ä
cant negative impact on the expected lifetime on the components
inside the D Series device.
NOTE: Fit solid blanks (not ventilation blanks) to unused rack spaces to ensure effective air circulation.
Leaving gaps in between items of equipment degrades the effectiveness of forced-air cooling.
If installing one or more D Series devices in a rack with other fan-cooled equipment, con
Ä
rm that all other
equipment also uses front-to-rear air
Å
ow for cooling. If this precaution is not observed, there is a risk of
overheating, as units with the reverse air
Å
ow will be drawing in air which has already been heated by the
D Series devices.
The D Series device is equipped with a sophisticated temperature sensing system which protects it from any
overheating which may occur as a result of inadequate ventilation.
9. Operating voltage
D Series has a universal power supply and its mains nominal and operating voltages are speci
Ä
ed in the Technical
Speci
Ä
cations (Section 15). D Series can be ordered with a variety of mains plugs. If the mains plug (AC plug)
Ä
tted
to the mains cable (AC cord) is not appropriate for your country it can be removed and a locally-sourced one
Ä
tted
instead. If you are not 100% con
Ä
dent of your competence to replace the mains plug (AC plug), the task should be
carried out by quali
Ä
ed personnel.
NOTE: In-rush current is controlled and limited during the soft-start sequence. This enables multiple
D Series Devices on the same AC mains circuit to be turned on simultaneously.
9.1. Low voltage country considerations
Although the D Series has a wide range of operating mains voltage, some considerations can be applicable for
low voltage regions. D Series performs well throughout the speci
Ä
ed nominal voltage range but has slightly better
ef
Ä
ciency at higher voltages. For regions with nominal voltage below 140 V, one could consider connecting the
ampli
Ä
er in a three phase delta or two phase split-phase con
Ä
guration, especially applicable for the bigger models,
(D 200, D 120 and D 80).
