How to solve our problem now - on the alternator voltage? - leroy somer r726
Just Wärtsilä Cummings and Leroy Somer alternator will be discussed - the production workshop and after the repair, re-install the factory. The remedy is for the sole engine parts - alternator parts service only.
The generator is Leroy Somer LSA 54M75, 2450 KVA, 415 V, 50 Hz, 4-pin. April Leroy Somer R 449 and R 726 (see attached chart). After installation, we could not the voltage (50 V, obtained instead of 415). Representatives of the web connections has been shown, and even evidence of AVR - OK.
At that time, was the representative of the contractor. try to use an external battery - it is an external battery unit for 2 seconds at rated excitation connected and managed to 415 VAC, as required. But back at the launch of the R 449-connection to the excitation unit - we could not reach the level of voltage of 415 V, but they manage to get only 50 V.
R 449-compound has an auxiliary winding voltage which the voltage of the auxiliary winding at rated speed and move 88V measures.
Another guy came yesterday and brought the external battery 12V 200Ah and connected to the body excitation (R cable from 449 connected to the excitation unit and the battery). Disconnect the other cables. After the execution for 2 minutes at rated speed, the son of the auxiliary winding was burned to the R-449 and left in the test. However, during the test voltage was about 488 V in the terminal.
The differential relay was triggered at this time if the generator is running, without any connection to the counter.
The hope of gaining its support.
Thanks
Friday, January 29, 2010
Leroy Somer R726 How To Solve Our Problem Now - On The Alternator Voltage?
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2 comments:
There is residual magnetism in the rotor, which is used to generate a voltage at the start. Although a weak field and produces a low voltage, polarity must be designed so that the tension mounted further. At some point there is enough play for the voltage regulator can power.
If the residual magnetism is sufficient to establish the correct voltage "flashing" to enable a permanent battery. The idea that building remagnetized the rotor to produce a voltage. So people can have a battery and switch is connected to flash by pressing a key on startup.
Thus, according to the description of the generation is set to 50V.
I would say that promoted the polarity of the voltage output (50V) instead of resistance by the voltage regulator.
When the voltage regulator of dollars, which is the magnetic field strength of the field in the rotor reduces and tends to zero and reduces the output voltage. This trend can not continue as a zero output voltage and, subsequently, the field strength is zero.
The geneTor can FLAS (temporarily create in connection to a battery at the moment) with a battery, a field in the right direction. (You may need to change the polarity of the battery)
If this fails, then:
The attempt to change the connections on the ground to / from the rotor. This reversal of polarity of the voltage produced by the residual magnetism and thereby increase the voltage regulator output.
Check the diode package provides the coils. Bet leg.
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