D&B D80, Manual

Page: 65 / 80

12.1. Power supply
The device utilizes a switch mode power supply with active Power
Factor Correction (PFC) and automatic mains range selection.
The power supply is equipped with mains voltage monitoring,
overvoltage and undervoltage protection as well as an inrush
current limiter.
12.1.1. Active Power Factor Correction (PFC)
The active
Power Factor Correction provides a clean and highly
efficient sinusoidal current draw, thus providing highest
performance under adverse mains conditions or when very long
power cabling is necessary.
The power factor is above 0.9 for mains power consumption
values of 500 W or higher.
12.1.2. Automatic mains range selection
The automatic mains range selection enables the device to be used
with any mains supply worldwide without the need for manual
action.
High range 208 - 240 V AC
Low range 100 - 127 V AC
Nominal mains ranges
Behavior with fluctuating mains voltages
With mains voltages other than the nominal voltages specified
above, the device switches to the adequate mode for either
'Protection' or 'Operation'.
The voltage thresholds are dependent on the slope of the mains
voltage change.
Undervoltage
Undefined
Overvoltage
The Main Power Supply is switched off. In
undervoltage state, the auxiliary mains
supply for device control only operates to a
limited extend.
0
Ü
75
Ü
133
Ü
170
Ü
266
Ü
400
Undervoltage Low range Undefined High range Overvoltage
Protection Operation Protection Operation Protection
0
Þ
85
Þ
140
Þ
190
Þ
276
Þ
400
12.1.3. Mains voltage monitoring
The mains voltage and frequency are recorded by the power
supply and can be viewed on screen. Where voltages outside of
this range are present, a self-resetting protective circuit responds
quickly to isolate the internal Main Power Supply leaving only a
supervisory circuit running to monitor the mains voltage. The device
accepts mains voltages of up to 400 V AC
RMS
without damage to
the device in case of a missing neutral line or running phase to
phase.
12. Operation (Hardware references)
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