Operation (Hardware references)
Behavior with fluctuating mains voltages
With mains voltages other than the nominal voltages specified
above, the device switches to the adequate mode for either
"Standby" (Protection) or "Operation".
The voltage thresholds are dependent on the slope of the mains
voltage change.
55
Ü
75
Ü
133 170
Ü
266
Ü
400
Undervoltage Low range Undefined High range Overvoltage
Standby
(Protection)
Operation
Standby
(Protection)
Operation
Standby
(Protection)
55
Þ
85
Þ
140 190
Þ
276
Þ
400
Undervoltage
Undefined
Overvoltage
Depending on the operating state, the
device will be switched to Standby mode
(Protection).
NOTICE!
In Overvoltage state with mains voltages above 400 V,
damage to the device cannot be excluded.
In Undervoltage state, the Auxiliary Power Supply for the
device control operates down to 55 V AC
RMS
.
Up to this threshold ...:
▪ The display remains active and the device can be operated
locally.
▪ The LED indicators on the front panel remain active.
▪ Remote control via web remote or R1 is still possible without
restrictions.
▪ Below this threshold, the device will be switched off.
9.1.4 Mains inrush current limiter
The Main Power Supply is started softly to limit inrush current. Up
to two D40 may be powered up at the same time without
triggering a line circuit breaker of 13-16 A (230 V) or 20 A
(100-120 V) respectively.
9.1.5 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 9.1.3 "Automatic mains range selection"
on page 61. 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:
d&b D40 Reference manual 1.5 en62
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