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

Page: 67 / 124

Rotor wiidiig
The insulatin resistance measurement betaeen the ainding and earth must be made aith the
relevant measuring device, piaered aith direct current and iutput viltage if 500 V.
The insulatin resistance must be measured betaeen the pisitve terminal ir the negatve terminal
if the ritir ainding in the rectier bridge and the earth if the ritir. See Figure 26- and Figure 27- .
The minimum isilatin value must be 5 MΩ.
Figure 26- Measuring the isolaton resistance on
the rotor winding
+ aid - termiials of the rectier bridge
Figure 27- Rectier bridge
Exciter stator wiidiig
➔ Measure the insulatin resistance betaeen phase and earth using an insulatin tester
(megger);
✔
The minimum isilatin value must be 5 MΩ;
✗
If the resistance is liaer than 5 MΩ:
➔ Clean the statir and, if necessary, paint it again aith grey tripicalising paint EG43;
➔
Dry it at 50-60 °C.
If the value remains lia even after these iperatins, the statir must be re-aiund ir replaced.
Self-regulating alternators ECO47-49 MV-HV Page 67/124