3000W Chinese Gensets Info.
professor95 wrote: EDIT ADDED 45/5/2013- When this thread started in March of 2005, I never expected to see it survive this long or amass the quantity of information that has been shared here. In...
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Bill.
I have new information that Matt is on vacation this week. If you need an over voltage module PM me your address and I will send you my spare. Can get another one later.
The AVR samples voltage from the exciter and MW coil(s) and runs it through an internal comparator and voltage doubler/regulator circuit that supplies the needed regulated voltage through the brush set to the armature. When an AVR goes south the exciter voltage is no longer regulated and the output voltage soars to the maximum possible. I suspect failure of a field effect transistor in the comparator circuit on the failures I have explored. The AVR is potted so you can't see the components but I have successfully un-potted several for examination and circuit analysis.
Shutting down with a load of course causes a voltage drop. As voltage drops current will rise (remember watts = volts x amps) and the AVR does it's best to compensate by increasing voltage/current to the armature. This can cause heating in the P/N junction of the bi-polar transistors of the comparator circuit which "may" lead to failure.
Running generators of this type does involve risks. This is why CPE designed the newest synchronous generator with load delay/shedding circuitry which helps to keep this from happening. Also why they have added the Volt Guard to some models.
SuperGenProducts does have a device called a Killavolt for Chinese generators of any wattage that plugs into an available outlet and provides the same protection as the Volt Guard. It is a good insurance policy for Chinese generators without the CPE Volt Guard (over voltage protector) built in.
110 degrees AND a high load, like an RV air conditioner, does add to the risk of AVR meltdown in ANY synchronous Chinese generator in this class. The Wiz removed his AVR from the end of the genny and mounted it outside where it was in "free air". I liked his approach. AVR's are "around" $35 and a spare is worthwhile.
I have new information that Matt is on vacation this week. If you need an over voltage module PM me your address and I will send you my spare. Can get another one later.
The AVR samples voltage from the exciter and MW coil(s) and runs it through an internal comparator and voltage doubler/regulator circuit that supplies the needed regulated voltage through the brush set to the armature. When an AVR goes south the exciter voltage is no longer regulated and the output voltage soars to the maximum possible. I suspect failure of a field effect transistor in the comparator circuit on the failures I have explored. The AVR is potted so you can't see the components but I have successfully un-potted several for examination and circuit analysis.
Shutting down with a load of course causes a voltage drop. As voltage drops current will rise (remember watts = volts x amps) and the AVR does it's best to compensate by increasing voltage/current to the armature. This can cause heating in the P/N junction of the bi-polar transistors of the comparator circuit which "may" lead to failure.
Running generators of this type does involve risks. This is why CPE designed the newest synchronous generator with load delay/shedding circuitry which helps to keep this from happening. Also why they have added the Volt Guard to some models.
SuperGenProducts does have a device called a Killavolt for Chinese generators of any wattage that plugs into an available outlet and provides the same protection as the Volt Guard. It is a good insurance policy for Chinese generators without the CPE Volt Guard (over voltage protector) built in.
110 degrees AND a high load, like an RV air conditioner, does add to the risk of AVR meltdown in ANY synchronous Chinese generator in this class. The Wiz removed his AVR from the end of the genny and mounted it outside where it was in "free air". I liked his approach. AVR's are "around" $35 and a spare is worthwhile.
