Mains Inrush Current Limiter; Mains Supply Requirements - D&B D80 Manual

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12.1.4. Mains inrush current limiter

The Main Power Supply is started softly to limit inrush current. Up
to two D80 may be powered up at the same time without
triggering a line circuit breaker of 13-16 A (230 V) or 30 A
(100-120 V) respectively. Inrush current is limited to:
– 13 A @ 230 V A C
RMS
– 22 A @ 120 V A C
RMS
– 27 A @ 100 V A C
RMS

12.1.5. Mains supply requirements

Due to the high power capability of the amplifier, properly
dimensioned mains supply installation and distribution are
essential.
However, the mains supply benefits from the built-in active PFC
(Power Factor Correction) function of the amplifier, which causes
an almost ideal (sinusoidal) current shape. Power losses of the
mains supply and cables are kept to the lowest possible minimum.
Due to its automatic mains voltage selection, the amplifier can be
fed from all usual mains voltages within the rated ranges as stated
in Þ Chapter 12.1.2. "Automatic mains range selection"
on page 65. Within these ranges, the mains voltage does not
affect average output power figures due to the built-in regulated
power supply. However, the dynamic character of common audio
signals may cause short-time power peaks being twice as high as
the average values. The resulting higher current draw causes an
increased voltage drop on the mains line which may reduce the
available output power if it gets too high.
To ensure safe and stable operation, observe the following
recommendations and specifications:
– Operate a single amplifier on a 16 A circuit breaker at 208 to
240 V (high range) or on a 30 A circuit breaker at 100 to
127 V (low range).
– Operate the amplifier at a high-range supply (208 to 240 V),
if possible. A low-range supply (100 to 127 V) requires a
cable cross section that is 4 times higher to achieve
comparable power performance.
– When three amplifiers are operated with a three-phase
(120°) mains supply, the current on the N (neutral) conductor
can be minimized by matching loads and signals between the
three devices.
– Keep the supply line as short as possible and its cross section
as high as possible, especially when operating the device at
100 to 127 V. Voltage drop at full load (30/15 A at
115/230 V) should not exceed 5 %. For reference
specifications, refer to the following table.
d&b D80 Manual 1.8 en