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Dear Mike, Well noted. We will do insulation test on the main rotor also, especially PI to ensure the condition based on insulation class. CMIIW. Thank you. Best Regards, Barkah

Dear Mike and Bill, Thank you for your respond. Actually, we have not any testing yet after replace suppressor and rewinding the rotor exciter. As both of you mentioned, before the alternator put back in service, we need to do as follows: 1. Flash the exciter to ensure exciter has enough...

Dear Bill and Catserveng, Below LINK is our discussion as Bill's mentioned. http://www.eng-tips.com/viewthread.cfm?qid=358937 Thank in advance. BR, Barkah

Dear Bill. Appreciate with your respond. You are correct that the connection from rotating rectifier is not our issue as we didn't disassemble the connection of the rotating rectifier. We disconnected two leads of the main field from (-) and (+) terminal of the rotating rectifier, but...

Dear All, Attached is the lead that we discuss it...whether it may be connected to rotating rectifier with consider polarity or not. Thank you. BR, Barkahhttp://files.engineering.com/getfile.aspx?folder=4e6ef1d1-ddd2-4420-93e2-2e0b74de87db&file=PLTD-ROTOR-1.jpg

Dear All, Attached is our installed AVR. Thank you. BR, Barkahhttp://files.engineering.com/getfile.aspx?folder=031992aa-dcd8-496c-b3cf-3696c0a4b27a&file=A_ôMARK_Iö.jpg

Attachment-7 (last) Many thanks, Best Regards, Barkahhttp://files.engineering.com/getfile.aspx?folder=dcd41635-9601-4559-a7b6-3c3802b62a1b&file=Wiring_12_terminal_generator_MJB-355_to_AVR-.png

Attachment-6http://files.engineering.com/getfile.aspx?folder=94afca60-8299-469f-85bf-49fd4e031e0e&file=5.2._Instruction_for_MANUAL_control_of_Generators_MJB-355.png

Attachment-5http://files.engineering.com/getfile.aspx?folder=008e95d6-1f90-4c3a-bcb1-f4d17ab31fbe&file=MJB-355_leads_from_rotor_to_rotating_rectifier.png

Attachment-4http://files.engineering.com/getfile.aspx?folder=8e945a01-05dd-43a2-8028-4a38697564fe&file=Previous_and_current_condition_of_the_exciter.png

Attachment-3http://files.engineering.com/getfile.aspx?folder=4e44dea5-e1a9-44bc-a97b-bd10315648bd&file=Rotating_Rectifier_MJB-355.png

Attachment-2http://files.engineering.com/getfile.aspx?folder=8e736a95-6548-4bb3-80ec-b0cbda3c0723&file=Schematic_generator_rotor_and_exciter_rotor.png

Dear Bill and all members, I've tried upload some attachments relates to the thread. I hope it does work correctly. Thank you. Best Regards, Barkah...

Dear Bill, Well noted. From your explanation, I assume that we can connect both leads to rotating rectifier terminals (-) and (+) with no risk i.e. burns exciter, suppressor diode or rotating rectifier. And if wrong connection only has consequences the output voltage will no build up. Correct...

Dear Bill, Our AVR type is Marelli M40FA640A/A “MARK I”. LINK below is the manual of Marelli Generator and our generator type is MJB 355 MA 4B http://www.mase.no/cart/images/File/Bruksannvisninger-GB/SIN.UM.018.3.pdf http://www.mase.no/cart/images/File/Bruksannvisninger-GB/SIN.UM.018.3.pdf

Dear Bill, Thanks for your response. Yes, these are the leads of salient poles rotor which should connected to rotating rectifier. The KVA alternator is 680 kVA and output voltage is 400 VAC. We are worry to reconnect the lead since we didn't tag the (-) and (+) on these leads before...

Dear members, I have problem on our AC generator (Marelli Generator MJB 355) with salient pole rotor (4 poles). The AC generator was need to repair due to suspressor diode was broken, then we taken out the rotor to repair rotor exciter. We disconnected cables rotor's winding from rotating...