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Generac Generators (SEARS, etc.)

Generac 17kw starts n shuts down


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  #1  
Old 11-16-2012, 09:08:00 PM
wstang254 wstang254 is offline
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Smile Generac 17kw starts n shuts down

hi hopefully someone on here can help , i had a customers 17 kw run for 5 days straight and on the 6th day shut down, checked the gas pressure its good, the unit cranks on manual starts up and shuts down, red light is on , can't seem to find someone with same issue on the net . Thanks to you guys i was able to fix my older dayton which had governor issue , the weights were stuck in the motor and got them to free up , thanks
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  #2  
Old 11-16-2012, 09:19:50 PM
Wayne 440 Wayne 440 is offline
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Default Re: Generac 17kw starts n shuts down

Do some basic troubleshooting. Does it "shut down" (i.e. the generator controls cause it to stop) or simply stop running (the controls remain in the run configuration) but it stalls?

If the former, make sure it has oil in it and maintains oil pressure, and that it is making voltage. Some models of the 17kw are known for self destruction of the generator end, it won't run if it is not making voltage. Small bits of copper in the bottom of the housing is a telltale.

If the later, check for fuel, air, spark and compression. If one of those 4 is missing it won't run.

5 days is a long time for one of those sets. Good luck.
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Old 11-16-2012, 09:50:58 PM
richard.bessey richard.bessey is offline
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Default Re: Generac 17kw starts n shuts down

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Originally Posted by Wayne 440 View Post
Do some basic troubleshooting. Does it "shut down" (i.e. the generator controls cause it to stop) or simply stop running (the controls remain in the run configuration) but it stalls?
Good place to start!

You mentioned a red light, what does that red light mean?
There is a problem sensed with the engine somewhere?
OR
There is a problem because the engine died.

Generac - I would keep your hopes low regarding getting it back online and running. Hopefully you can find a manual that will be helpfull.
After running for 5 days straight, I would check sensors on the engine (oil pressure, rpm, temperature, etc...) make sure they are putting out what they are supposed to. If everything checks out OK, I would start looking at the controller. You might be able to go with an aftermarket controller off of Ebay or something that will give your more diagnosistic info, "Controller turned off engine due to loss of oil pressure" etc...
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Old 11-16-2012, 10:22:42 PM
Wayne 440 Wayne 440 is offline
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Default Re: Generac 17kw starts n shuts down

Consider posting your issue on this Generac specific board as well - http://zillerstore.com/forums/index.php

They appear well versed in dealing with Generac and the many failure modes thereof.
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Old 11-16-2012, 10:26:30 PM
Chris Schmidt Chris Schmidt is offline
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Default Re: Generac 17kw starts n shuts down

Residential unit? Air cooled or Liquid cooled? What's the genset model #?

Check here for a manual:
http://www.zillerelectric.com/info/Manuals
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Old 11-16-2012, 10:31:54 PM
wstang254 wstang254 is offline
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Default Re: Generac 17kw starts n shuts down

thank you everyone for the fast repplies, yes if you put it on manual , engine cranks and starts up the shuts down about 2 seconds after it starts , we thought it was the propane being a 1/2" line 60 feet and the 325 gallon tank but it was holding 10-11 inches of water column, i saw on the screen it said under voltage but my father who works on these more than me says he has seen this when they don't start. unit has oil, we were thinking of pulling one sensor wire off at a time assuming the sensors ground out in trouble .
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Old 11-16-2012, 10:43:19 PM
Wayne 440 Wayne 440 is offline
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Default Re: Generac 17kw starts n shuts down

If it is an air cooled 17kw, my first guess is that it isn't making voltage. The voltage regulator and rotor/stator have both been redesigned in response to widespread issues.
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Old 11-16-2012, 10:47:31 PM
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EricWood EricWood is offline
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Default Re: Generac 17kw starts n shuts down

What model is this?

Another thing to check....gensets that use a magnetic pick up (MPU) for speed sensing and/or governor control will shut down immediately if they don't sense a good speed reference.

To check an mpu, disconnect lead at the mpu, and probe with a multimeter reading AC volts while an assistant cranks the engine for you. Need to have a low voltage signal--usually greater than .8~1 volt AC minimum; may see 3 volts at cranking depending upon he mpu. Can also ohm it. Ohms values will vary, but should be around 200-350 ohms, or 800/900 ohms depending upon style.

eric
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Old 11-16-2012, 11:36:16 PM
wstang254 wstang254 is offline
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Default Re: Generac 17kw starts n shuts down

yes its an air cooled unit i installed 10 months ago, i'm the electrical contractor and was tryn to help the guy while he waits for a generac tech as they are backed up in ct.
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Old 11-17-2012, 12:17:55 AM
pegasuspinto pegasuspinto is offline
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Default Re: Generac 17kw starts n shuts down

Dumb question-does it have oil? did you dipstick it? does it have oil pressure?
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Old 11-17-2012, 02:23:33 AM
wstang254 wstang254 is offline
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Default Re: Generac 17kw starts n shuts down

yes sorry we did check for oil , need to check the sensors , i think someone said most use grounding sensors, so if we pull a wire off each sensor one at a time and it starts we find which one is bad assuming they are grounding when in trouble.
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Old 11-17-2012, 03:32:29 AM
armandh armandh is offline
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Default Re: Generac 17kw starts n shuts down

I have the contractor version
[relay engine logic, no exercise cycle]
the low oil pressure switch is to ground and the governor/shutdown module
unknown if it is NO or NC
it also has voltage sensing input from a winding that feeds the AVR
connect a lamp to the output to check for voltage

I do not load mine over 12 KW
of the sales inspired 17.5 KW /26.2 surge "alleged" rating

2 or 3 months with out the local utility is going to test so many generators on the east coast
many will come to realize what most here have known
these are for brief outages not prime power

Last edited by armandh; 11-17-2012 at 03:46:33 AM.
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Old 11-17-2012, 03:37:24 AM
wstang254 wstang254 is offline
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Default Re: Generac 17kw starts n shuts down

what do you mean you have the contractor version ?
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Old 11-17-2012, 04:00:59 AM
armandh armandh is offline
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Default Re: Generac 17kw starts n shuts down

Quote:
Originally Posted by wstang254 View Post
what do you mean you have the contractor version ?
gasoline on wheels [portable]
my late friend tom's widow has the NG/LPG home unit but it is the same engine generator inside the outside box
these also have a continuous flashing circuit taking power from the cranking battery and when the engine is running
feeds through a diode and current limiting resistor to the field
this is possible because the AVR power and sensing is derived from isolated windings
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Last edited by armandh; 11-17-2012 at 04:17:05 AM.
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