Thermo King Manuals Genset
I recently bought this genset and as far as I can test it seems to be in reasonable order.The engine runs good with no smoke and oil pressure is good. The previous owner used it for running a fridge plant.
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The makers plate indicates 460 volt 3 phase at 60 cycles. (Main breaker is 16 Amps.) Serial #CGS1250DNSGM43 8241 700603 Can someone identify the KVA and model from this? ( Seems to be quite old ) Also when measuring the output voltage I get between phases 360 volt except for the last phase 460 volt. The voltages from neutral to phases are 220, 220 and 240. I checked and it is a 12 wire head and it appears as though there has been NO tampering with the connections. The controller is a Kelreg 7211-2 Any ideas? How do I identify the make of engine?
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4 Cylinder diesel with Bosch injection system. No other markings that I can find. ( I do have pics ) I have connected to a 3 phase 380 volt 3 Kw electric motor and seems to run fine but I am worried about the different voltages on the output. Lastly I stay in South Africa, so our voltages are 220/230 for single phase and 380 volt for 3 phase at 50 cycles, so just syncing with our city power would get the correct speed. I trust the boffins can help. I shall try my best! There are 12 wires coming into the control box 3 wires going to neutral buss 3 wires going to 3 phase output ( to breaker ) 6 wires connected to one another ie.
3 coming out of alternator and 3 going back in. I have read elsewhere that if it is a CAV injector pump it could be a Isuzu engine? But this is a Bosch pump.so yes, could be german. Post added at 08:45 PM - Previous post was at 08:10 PM - Sorry, The regulator: Each of the three output wires ( to the breaker ) jumps into the regulator plus a wire from the neutral jumps on the board to 3 different plug points opposite the three output connections. From the description of the connections, it appears to be wye connected. But the voltages do not add up.
You should see 460 line to line and 266 line to neutral, and they should all be very nearly the same. I'd check your meter on a known good source, and make certain you're making a good connection between the meter and the leads under test. I would check to the neutral buss and not ground, since the neutral may not be bonded to the chassis.
Also check the connections between the winding leads and the neutral buss bar, between each other, and between them and the breaker. I'd check voltages ahead of the breaker too. If left open for years it's contacts may not be making good contact. I'd suspect breaker first. 460 volts, 3 phase, 16 amperes is 12-3/4 KVA. It was probably designed for 80% power factor, so the engine may only be capable of 10 kW. Of course there's no guarantee that the generator is rated for 16 amperes.
If you can readjust the governor to get 50 cycles instead of 60 cycles, and keep the excitation the same, you will get very nearly the 220/380 three phase current you desire. If there is a voltage regulator present you'll have to figure out a way to make it work at the lower voltage. A small transformer supplying the regulator would do it if no better solution can be found. KVA will be reduced accordingly, and the engine's output will be reduced at the lower speed as well. Going on the assumed figure of 16 amperes you'd have about 10-1/2 KVA and 8-ish kW. From the description of the connections, it appears to be wye connected. But the voltages do not add up.
You should see 460 line to line and 266 line to neutral, and they should all be very nearly the same. I'd check your meter on a known good source, and make certain you're making a good connection between the meter and the leads under test. I would check to the neutral buss and not ground, since the neutral may not be bonded to the chassis. Also check the connections between the winding leads and the neutral buss bar, between each other, and between them and the breaker. I'd check voltages ahead of the breaker too.
If left open for years it's contacts may not be making good contact. I'd suspect breaker first.
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460 volts, 3 phase, 16 amperes is 12-3/4 KVA. It was probably designed for 80% power factor, so the engine may only be capable of 10 kW.
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Of course there's no guarantee that the generator is rated for 16 amperes. If you can readjust the governor to get 50 cycles instead of 60 cycles, and keep the excitation the same, you will get very nearly the 220/380 three phase current you desire. If there is a voltage regulator present you'll have to figure out a way to make it work at the lower voltage. A small transformer supplying the regulator would do it if no better solution can be found.
KVA will be reduced accordingly, and the engine's output will be reduced at the lower speed as well. Going on the assumed figure of 16 amperes you'd have about 10-1/2 KVA and 8-ish kW. Keith Thanks Keith, Most of your suggestions I have already tried, meter good, connection good, using neutral bus. The breaker is definitely good and I check voltages before the breaker is any case. I think next I am going to do a continuity test on the phases to check resistance of coils. Power is fed into the controller from all three phases and the neutral bus and 2 wires going back into the gen housing for the regulating.
( I assume ) I have looked at the various possibilities of the winding connections and it looks as though I have a series type star connection but please correct me if you think I am wrong.