2 MEP803a with issues.....Overload with 8kw load on one and Bogging down on the other.

[TheAlfredo]

I recently purchased 2 803a from a guy in Anderson, SC. Today I got around to load testing them. Both have different issues.

Generator #1 runs fine. But you put a 6.66 load and the "Percent Capacity" meter gets pegged all the way up. Voltage and Amps are correct. runs fine. But when I add over 8kw of load, it trips the circuit interrupter and lights up overload.

Generator #2 bogs down if I add over 7.5kw on the load bank. As if it isn't getting enough fuel.

 

[Scoobyshep]

What mode do you have it set in?

 

[TheAlfredo]

What mode do you have it set in?

what do you mean what mode? 120/240v?

 

[Scoobyshep]

yes. 120 single, 120/240 single or 120/208 three

 

[TheAlfredo]

yes. 120 single, 120/240 single or 120/208 three

120/240 single

 

[kloppk]

For #1 I'd suggest measuring the AC voltage across each of the Burden Resistors R10, R11 & R12.
Normally the voltage across each will vary from 0 VAC at 0% Load to 5.6 VAC at 100% Load.
At 133% Load the AC voltage across them would be 7.5 VAC.

By checking each of the voltages you'll narrow down where the false overload is coming from.

 

[TheAlfredo]

For #1 I'd suggest measuring the AC voltage across each of the Burden Resistors R10, R11 & R12.
Normally the voltage across each will vary from 0 VAC at 0% Load to 5.6 VAC at 100% Load.
At 133% Load the AC voltage across them would be 7.5 VAC.

By checking each of the voltages you'll narrow down where the false overload is coming from.

wish i wasn't going out of town for a several weeks tomorrow. I hate leaving a project half completed.

 

[Guyfang]

For gen #1, this could be an S8 problem. Cleaning it might help. Also checking that its wired right is always something you should do.