Cooling; Operating Voltage - Lab.gruppen TFS-900 User Manual

9.4 Cooling

9.4.1 Overview
The 20000DP uses a forced-air cooling system with airflow from front to rear, allowing high continuous power levels
without thermal problems. Front-to-rear airflow is preferable as air at the front of a rack is cooler than that at the
rear in nearly all situations; never attempt to reverse the airflow. The operation of the cooling system is dependent
on front-to-rear airflow; it will not function effectively with external airflow in the opposite direction.
Make sure an adequate air supply is provided in front of the 20000DP, and that the rear of the amplifier has sufficient
space to allow air to escape. If the amplifier is rack-mounted, never operate the unit with any front or rear rack doors
or covers in position. It is recommended to keep the ambient temperature around the amplifier as cool as possible.
An increased temperature can have a significant negative impact on the expected lifetime on the components inside
the amplifier.
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 20000DP amplifier in a rack with other fan-cooled equipment, be sure that all the other
equipment also uses front-to-rear airflow for cooling. If this precaution is not observed, there is a risk of overheating,
as units with the reverse airflow will be drawing in air which has already been heated by the amplifiers.
9.4.2 Temperature Sensing and Protection
The 20000DP is equipped with a sophisticated temperature sensing system which protects it from any overheating
which may occur as a result of inadequate ventilation.

9.5 Operating Voltage

The 20000DP is equipped with a universal power supply operating from 80 to 265 V. Only connect the mains cable
(AC cord) to an AC source of the voltage shown on the label. The 20000DP uses primary switching, which means the
mains power is rectified on the primary side of the transformer. This makes the power supply insensitive to mains
frequency variation, and it will operate normally on line frequencies from 45 to 75 Hz. If the mains plug (AC plug)
fitted to the mains cable (AC cord) is not appropriate for your country, it can be removed and a locally-sourced one
fitted instead, observing the color coding in the table below:
PowerCON Pin 230V version
L Brown
N Blue
E Green/Yellow
If you are not 100% confident of your competence to replace the mains plug (AC plug), the task should be carried
out by qualified personnel.
Once a suitable AC power supply is connected, the device can be turned on using the front panel power button.
When turned on, a diagnostic routine is performed and the power button LED changes from red (Standby) to green
(Active).
115V version
Black
White
Green
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