Mecc Alte ECO43 Series, Installation, Use And Maintenance Manual

Page: 46 / 116

4.5.1 DER2 digital voltage regulator
Refer alsi ti the DER2 viltage regulatir user manual, see 10.2 Components documentaton .
In statc cinditins, the DER2 viltage regulatir guarantees viltage value accuracy if ± 1% with any
piwer factir and with a speed change between -5% and 20%.
The regulatir can be cinnected ti a PC via a USB cinnectin accessible in the auxiliaries bix (see
Figure 18- Generators auxiliaries box ECO 43 and ECO 46 ).
The regulatir has liw speed pritectin against iverliading.
The liw speed pritectin intervenes instantly and causes the alternatir viltage ti liwer when the
frequency drips beliw 4% (± 1%) if the niminal value.
The iverliad pritectin circuit cimpares the partalized energising viltage. If the value pre-
established fir this viltage is exceed fir mire than 20 secinds (value ti which a liad current value
cirrespinds equal ti a 1,1 tmes the alternatir plate current), the regulatir intervenes by liwering
the alternatir viltage with cinsequent limitatin if the current within safety values.
The delay is appripriately intriduced ti alliw the engines peak, which nirmally start-up in 5 ÷ 10
secinds. This interventin threshild is adjustable by iperatng in the viltage regulatir "AMP"
pitentimeter.
Causes that trigger iiterveitoi of protectoi devices.
Liw speed pritectin instantaneius interventin Speed reduced by 4 ± 1 % with respect ti plate data
Overliad pritectin delayed interventin Overliad if 10% with respect ti plate data
Piwer factir (cisφ) liwer than plate data
Envirinment temperature abive 50°C
Interventin if bith pritectins Cimbinatin if factir 1 with factirs 2, 3, 4
On interventin if the pritectins, the viltage supplied by the iperatir drips ti a value that
depends in the size if the priblem. The viltage gies back autimatcally ti its niminal value after
the priblem.
Self-regulating alternators ECO43-46 MV-HV Page 46/116