Lab.gruppen fP 3400 - Manual (Page 12)

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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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National deviation concerning installation of the fP 3400:
Danish safety regulation only permits 8A main fuses. As the fP 3400 uses an internal primary mains
fuse of 15A, the fP 3400 must be equipped with an industrial mains connector rated for 16A, or as an
alternative be permanently installed to a 16A circuit.
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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.
If however you wish to tie the signal ground to chassis, connect the XLR-connector’s shell lug to pin 1. In
the interest of safety never disconnect the earth pin on the AC power cord.
For all units that are CE or FCC approved (radio interference), there is an AC mains filter. This filter
needs the chassis ground for reference, otherwise a current loop is formed via the signal ground.
Use the balanced input to avoid hum and interference.
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There are three ways to determine the power/current consumption of the amplifier:
First, the peak current draw at full output power. Under this condition the power will blow the mains
breaker within 30 seconds, or the amplifier will operate for less than 2 minutes before thermally
limiting. Therefore it is meaningless to state the input power at full power. The heat power at full power
will anyway be limited by the protection circuits. There is no audio program material producing steadily
full output power; it would be only sine wave for test purposes. It is more useful to state the current
draw in different loads and output power levels. These figures can be found on the specification sheet.
The current draw is measured in Ampere rms. This figure corresponds to the minimum value of the
mains fuse needed.
We recommend you to design the power distribution at least for the current at 1/8 power, and for 1/3
power for heavy-duty demands like discotheques, etc.
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