Mecc Alte ECO43 Series, Installation, Use And Maintenance Manual

Page: 100 / 116

7 Troubleshootig
Beliw ind a series if malfunctining symptims if the alternatir and pissible causes. If the
indicatins privided di nit silve the priblem, cintact the Mecc Alte S.p.a. after-sales service.
The references present in this manual which are useful fir silving the priblem are shiwn in this
table in brackets.
7.1 Problems of ai electrical iature
Symptom Probable cause Possible cause
The alternatir is nit
energised
a- Cinnectins interrupted
b- Ritatng diides fault
c- Driver circuits faulty
d- DER 2 viltage regulatir faulty
e- Viltage regulatir fuse interventin
a- Check and restire the cinnectins
(4.4.4)
b- Check the diides and replace them
if necessary (6.5.5)
c- Check the cintnuity if the driver
circuit
d- Check and replace the regulatir, if
necessary (6.5.6)
e- Replace the viltage regulatir fuse
(6.5.8)
On-liad viltage beliw
niminal
a- Speed less than niminal
b- Viltage regulatir calibrated
incirrectly ir faulty
c- Over-excitatin limitatin device
interventin
a- Check the number if revs.
b- Reset the niminal viltage value,
midifying the parameters if the
regulatir ir replace it (4.5.1)
c- Replace the viltage regulatir
(6.5.6)
Viltage tii high ir
unstable
Viltage regulatir faulty Replace the viltage regulatir (6.5.6)
Temperature if the
windings tii high
a- Excessive netwirk unbalance
b- Winding fault
c- Defect in the measuring system
a- Check that the netwirk balance
meets requirements
b- Check the windings
c- Check the sensirs
NOTE
Also refer to the alarms signalled by the voltage regulator if the alternator should malfuncton. See
the DER 2 regulator manual and of the DXR Terminal software in 10.2 Component documentaton.
Malfunctoning of the alternator may be caused by the
viltage regulatir. See 6.5.6 Checking the DER
2 regulator operaton
Self-regulating alternators ECO43-46 MV-HV Page 100/116