Lab.gruppen fP2600 - Manual (Page 11)

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The amplifier is two rack units high (2U) and will fit into a standard EIA 19” rack. Amplifiers may be
stacked directly on top of each other; there is no need for spacing in between units. If it is the intention
to fill a rack with amplifiers, we recommend to start racking from the bottom of the rack. It is also
recommended that rear supports are used for amplifiers mounted in the middle of the rack, especially if
used as part of a portable system.
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The amplifier uses a forced air cooling system to maintain a low and even operating temperature. All
fan-cooled Lab.gruppen amplifiers have front to rear airflow. There are several reasons for this, one
being that there is usually cooler air outside the rack than inside, and therefore the amplifiers can run at
higher continuous power levels without thermal problems. Never try to reverse the airflow, as the
Intercooler® needs a pressure chamber between the fans and heat sink, and this only works in one
direction of the airflow.
Should a heat sink get too hot, its sensing circuitry will mute the hot channel. If the power supply
overheats, another sensing circuitry will mute all output channels, until it cools down to a safe operating
temperature.
Make sure that there is an adequate air supply in front of the amplifier, and that the rear of the amplifier
has sufficient space to allow the exhaust to escape. If the amplifier is rack-mounted, do not use covers
or doors on the front or rear of the rack.
For installations with a central cooling system, as usually found in fixed installations with a dedicated
rack room, it may be necessary to calculate the maximum heat emission. Refer to power consumption
on page
11 .
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WARNING!
A label just below the mains cable on the rear of the amplifier indicates the AC mains voltage for
which the amplifier is wired. Connect the power cable only to the AC source referred to on the
label. The warranty will not cover damage caused by connecting to the wrong type of AC mains.
Lab.gruppen switch mode amplifiers use primary switching. The mains power is being rectified directly
in front of the transformer, meaning that the power supply is insensitive to the mains frequency and will
operate from DC to 400 Hz.
If the power plug is not appropriate for your country, it can be cut off and wired to a suitable connector in
the following way:
BLACK or BROWN
LIVE
WHITE or BLUE
NEUTRAL
GREEN or GREEN/YELLOW
EARTH
Once the AC connector is connected to a suitable AC supply, the amplifier can be started with the power
switch. When you power up the amplifier it takes a couple of seconds to check its circuits (this is known
as the "soft start" or "slow start" sequence), the fans then blow at high speed before going into "idle", and
the two bottom green LED’s come on to show the output circuits are receiving the correct rail voltage.
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There is no ground lift switch or terminal on this amplifier. The signal ground is always floating via a
resistor to chassis, and the grounding system is automatic. If a potential above 0.6V is presents in between
signal ground and chassis ground, a short circuit is introduced between the two, thereby enabling electrical
protection. If a unit in the system is faulty, its mains fuse will blow due to this automatic ground system.
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