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
266
Ü
400
Undervoltage
Standby
(Protection)
Operation
Overvoltage
Standby
(Protection)
55
Þ
85
Þ
276
Þ
400
Undervoltage
Overervoltage
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 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.
14.1.4. 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.
To ensure safe and stable operation, observe the following
recommendations and specifications:
▪ 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. Voltage drop at full load should not exceed
5 %.
d&b 10D/30D Manual 1.10 en 77
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