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 airÅ 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 airÅ ow. Make sure an adequate air
supply is provided in front of the D Series device, and that the rear of the device has sufÄ 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 signiÄ 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, conÄ rm that all other
equipment also uses front-to-rear airÅ ow for cooling. If this precaution is not observed, there is a risk of
overheating, as units with the reverse airÅ 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 speciÄ ed in the Technical
SpeciÄ 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% conÄ dent of your competence to replace the mains plug (AC plug), the task should be
carried out by qualiÄ 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 speciÄ ed nominal voltage range but has slightly better
efÄ ciency at higher voltages. For regions with nominal voltage below 140 V, one could consider connecting the
ampliÄ er in a three phase delta or two phase split-phase conÄ guration, especially applicable for the bigger models,
(D 200, D 120 and D 80).
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