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.
8.1.4 Mains inrush current limiter
The Main Power Supply is started softly to limit inrush current. Up
to two 40D 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.
8.1.5 Mains supply requirements
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 8.1.3 "Automatic mains range selection"
on page 31.
For the average and peak current requirements for specific mains
voltages please refer to Þ Chapter 3.1 "Current/power draw and
thermal dissipation" on page 10.
To ensure safe and stable operation, observe the following
recommendations and specifications:
▪ Operate a single amplifier on a 13 A circuit breaker at 208 to
240 V (high range) or on a 20 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.
d&b 40D Reference manual 1.3 en32
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