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For the purpose of this discussion I meant class 7 and 8 truck. Most Everything on the road these days is 12 volt anyway.

Many years ago, yes. Anything built in the last 30 years will be 12V start.

Per cell, yes. For the vast majority of Diesel engine starting applications, 12V batteries are used and connected in series for 24V (when the system is 24V).

Yes to all your questions. The push buttons on those panels are known to fail, especially in hot climates and applications where the panel is exposed to direct sunlight.

Diesel mechanic/generator tech here. Modern On road trucks (in North America anyway) are all 12 volt, presumably to maintain parts interchangeability with lighter on road vehicles. Most of the smaller off road equipment and generators that only require one battery are 12V. Since batteries do...

I do field service work for a major manufacturer of natural gas/diesel engines and generators. I’ve never seen anything in the 2-300kw range running at any speed other than 1800 rpm for 60 hz. It’s not until you get into much larger units that 1200 rpm is common. Many gas units are offered in...

I work for a generator company with a large rental fleet. 1) All of our units have adjustable breakers in order that output cables can be properly protected 2) Yes. Many of our rentals have generator ends with separate windings and/or built in transformers so that 120/240 can be provided...

Bill, Apologies for the delayed response. I set the jumper to 60 hz, however this AVR has adjustable ufro (knee) point, which I set to 51.5 hz.

Thanks Bill, I set the voltage at 585. Certainly not a ROCK steady speed. Even unloaded, the cyclical inertia of crusher rotation made the generator speed slightly unsteady.

Waross--therein lies the problem. The AVR has failed resulting in low voltage output, so I don't know where the voltage was running prior to the failure. The customer doesn't know either since there is no metering on the unit. The generator is installed on an engine driven rock crusher--as...

HI All, I am working on a belt driven generator--150 kw, 4 pole, 600V/60Hz. We know this unit should be driven at 1800 RPM. The drive sheave currently installed dictates that the generator only spins at 1650 RPM/54 Hz. It has worked this way for years. I have advised the customer on the...

Hello All, I am a technician working for a dealer selling one of the leading generator brands. I've been tasked with performing a failure analysis on a unit that was overhauled and experienced a major failure shortly after start up. I know there are some folks on this forum who are very...

This control panel utilizes CDL (Cat Data Link), and therefore will communicate via Cat ET software. You will most likely need to wire in a 9 pin deutsch connector to allow connection with a Cat communication adaptor. Your local Cat dealer will be able to assist. If you have ET and would like...

Thank you Bill. After going over the data files, I definitely intend to connect phase A to a different channel on my instrument when I return to site. I will also connect CTs onto the neutral and ground. The neutral is solidly grounded and brought out from the generator into the building...

Thank you for your feedback Keith and jraef. I understand now exactly what causes the distortion. The generator is synchronous, and the load doesn’t exceed 60kw (or didn’t during my power study). This load is spread among 10 drives. I didn’t document the exact motor sizes but am sure the load...

Current sine wavehttps://files.engineering.com/getfile.aspx?folder=5d6c2b4c-c023-45f9-9235-9836a9c4cfb7&file=current_sine_wave.PNG

Hello, I am a generator technician working for a company that sells engine driven generators. I have very little knowledge or experience when it comes to VFDs. A customer has two sites where the loads consist mostly of VFD driven 3 phase 480 volt motors, driving rock cutting machines. One...

I assume this is a spec for an engine driven generator? Seems like a very odd spec. The vast majority of 3 phase generator sets are rated at a .8 power factor. In that case, the engine will be overloaded at maximum kva output and any power factor closer to unity than .8. If the customer...

Thanks xnuke and waross...learned something new...its you guys who deserve the LPS.

I have a customer with a 100 kw 3 phase Stamford generator, and he wants to re-connect it for single phase 240/120V operation. I realize this will de-rate the available power output to 67% of rated kVA. What I am not sure about is the connection drawing states that if 120V (L-N) is needed from...