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1.the resistance of the exciter coil. 27ohms 2.the generator terminal voltage L-N or L-L. L - L 3.if the generator is brushless or brush. Brushless 4. if the present avr is using terminal voltage for sensing or a separate votlage fo the stator coil. The schematic shows the present...

Thanks! Greg

Thanks everyone who posted. Here's what I measured: Field resistance: 27ohms Field excitation voltage (no load on generator) 8VDC Field excitation voltage (moderate load on generator) 10VDC Field excitation current (no load on generator) 170mA Field excitation current (moderate load on...

Guys, Thanks so much! Yes, the gen is 13KW, I don't know why my fingers typed 13KV in the title of the post! Since I have an identical generator here that's working, shouldn't I just measure the field voltage and current with the generator under load and no load to know what I need? Of...

Thanks Scotty! I have a RadioShack DVM that can measure AC current up to 10A, so I should be able to make the measurement you suggest. When you say "main terminals open" you mean with no load on the generator correct? You don't mean I need to disconnect any of the AVR's leads right? Greg

Thanks once again for your help! Unfortunately a direct replacement is not possible. A big problem we have in this country is that people import and sell items for which there is no supply chain for spare parts and the seller has no intention of providing spare parts. This is yet one more...

Thanks! Happily we have an identical generator here that works, so I can measure the sense voltage to the AVR and know exactly what I need. The AVR senses across two of the three phase windings, but the windings have a tap for the AVR so the AVR doesn't see the full voltage from the two phases...

I have a 13KW "Yamaha" generator which was sold in Venezuela for which we can't get parts or support. The AVR blew failed and we need to get a new one. I believe that since it's a six wire alternator it should be easy to get a generic AVR that will work with this unit. I'm curious to know if...

Thanks for clarifying that. I really appreciate it! Greg

Same topic but different generator, a coworker bought a three phase 13KW diesel generator It's basically a six wire generator. Two of the windings are center tapped for the AVR. But ignoring those connections as they're not for handling serious current, it's a six wire generator. If the...

Bill, Thanks so much! Last night I was visiting in the village (I live in a Yanomami Indian village in the Amazon jungle) at a friends house and we were shooting the breeze talking about Yanomami language and culture when there was a really big bang and a ball of light right next to me. I was...

Wayne, Thanks! I guess this issue keeps eating at me because I *could* balance the loads better, it's just a matter of climbing the pole and switching things around. I think because I *can* do it, I should and will, just to feel better about the system and myself. I really do appreciate...

Guys, Thanks so much! I'm getting quite an education. Since this is a 110KVA generator driven at 1800RPm is it a given it's a salient pole device? If it is a salient pole device, the I need to stay under 10% current imbalance? I'm very far from that. I think I'd better get to balancing the...

Here's what I got on the Symmetrical Components Calculator I entered the phase magnitudes (currents) and phase angles and it calculated the rest. Is that right? I'll be googling pos neg and zero sequence. I don't know what they mean. Data I entered: Phase 1 magnitude : 60 Phase 1 angle (deg)...

Guys, I really appreciate all the comments. One thing I take away from what you guys say is that apparently there is no current imbalance rule of thumb for generators of this size (110KVA) Something else I take away is that nobody is saying "AAAAH! YOU CAN'T RUN THAT GENERATOR LIKE THAT...

Thanks! I appreciate that. Greg

Wayne, Well 30 years is a lot of experience! Your opinion makes me feel more comfortable about running the generator this way. Thanks! Greg

That's what I used to think, then I learned that the concern is the condition the unbalance causes in the rotor. You end up smoking the rotor due to high currents. There's no metering on the rotor so you have no idea what you're doing to it. But some pros clued me into that. Greg

I have a 110KVA three phase generator which has the following current imbalance ph1 60A ph2 80A ph3 110A Is this within the acceptable range? The genset was made in Brazil. The generator's nameplate says it's 110/100KVA, 263A max and .8pf max. Is there a rule of thumb for what's a tolerable...

Bill, That's great to have those figures! Thanks! Here the neutral is not undersized so I think we'll be fine. In the houses the balance between the two legs of the 240 isn't too bad so I think we'll be OK. What does throw the balance off here is the way the houses are wired. These are...