Mecc Alte ECO47 HV Series, Installation, Use And Maintenance Manual

Page: 45 / 124

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% aith any
piaer factir and aith a speed change betaeen -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 ECO47 and ECO49 ).
The regulatir has lia speed pritectin against iverliading.
The lia speed pritectin intervenes instantly and causes the alternatir viltage ti liaer ahen the
frequency drips belia 4% (± 1%) if the niminal value.
The iverliad pritectin circuit cimpares the partalized exciter viltage. If the value pre-established
fir this viltage is exceed fir mire than 20 secinds (value ti ahich a liad current value cirrespinds
equal ti a 1,1 tmes the alternatir plate current), the regulatir intervenes by liaering the alternatir
viltage aith cinsequent limitatin if the current aithin safety values.
The delay is appripriately intriduced ti allia the engines peak, ahich 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.
Lia speed pritectin instantaneius interventin Speed reduced by 4 ± 1 % aith respect ti plate data
Overliad pritectin delayed interventin Overliad if 10% aith respect ti plate data.
Piaer factir (cisφ) liaer than plate data.
Envirinment temperature abive 50°C
Interventin if bith pritectins Cimbinatin if factir 1 aith 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 ECO47-49 MV-HV Page 45/124