Question about Northstar Generator 9 Hp, 5500 Watt, Gasoline

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Generator runs fine- does not produce any power- checked breakers all ok

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Starlight Power

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If your generator produces no electricity or power, you can check the following causes:

1. The residual magnetism of the generator core is disappeared or too weak.
The residual magnetism can be lost naturally when the genset is placed too long or it can also happen from running a generator with no load for too long. However, for the new genset, the residual magnetism can be lost due to a long distance transportation vibration. Thus, it will cause the remanence voltage of generator is disappeared or less than normal remanence voltage value, namely, the remanence line voltage is less than 10V, the remanence phase voltage is less than 6V. Because the stator of synchronous generator, rotor, as well as AC exciter stator, and rotor core are usually folded by adopting 1~1.5mm thick silicon steel sheet. After excitation vibration, the residual magnetism is easy to disappear or weaken. When the residual magnetism is lost, the generator will produce no power at start-up.

2. Excitation circuit wiring error
The polarity of the excitation winding is reversed. After electrifying, the magnetic field produced by the field winding current is counteracted with the residual magnetism, resulting in the disappearance of the remanence. In addition, when measuring the DC resistance of the excitation winding or testing the automatic voltage regulator AVR, without paying attention to the polarity, which will also cause the core remanence to disappear.

3. Excitation circuit is blocked
In the generator excitation circuit, the electrical contact is bad or the wiring head of each electrical component is loose, the lead wire is broken, causing the circuit to be interrupted, and the generator excitation winding has no excitation current.

4. Circuit for DC side of rotary rectifier is interrupted
Due to the interruption of circuit for DC side of rotary rectifier, therefore, after the AC exciter is rectified by the rotary rectifier, the excitation current supplied to the excitation winding can not be sent into the excitation winding, resulting in AC synchronous generator can not generate electricity.

5. AC exciter fault, no output voltage
The generator can't produce electricity due to AC exciter failure, so that the excitation winding of the AC synchronous generator has no excitation current.

6. Generator excitation winding is broken or grounded, resulting in the generator has no excitation current or the excitation current is minimal.
Helpful article: https://www.dieselgeneratortech.com/generators/why-generator-wont-produce-electricity.html

Posted on Jan 06, 2020

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Richard Morris

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The voltage regulator for the generator is not work, replace it. Why, if there no dc voltage to excite the stator it won't any output. GB...stewbison

Posted on Aug 31, 2011

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1 Related Answer

Anonymous

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SOURCE: have a gg3500 gas generator that give no current

you need to check to make sure you have no power out put, check all receptacle. if none check your owner Manuel on how to flash your unit. you may want to check all breakers. if flashing don't work take it to repair center to check stator and rotor

Posted on Oct 13, 2009

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