Question about Coleman Powermate Powermate 5000W Generator

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Ust 3000 generator-only idles-no voltage output

Generator starts fine and runs only about idle.
No voltage output until you manually speed up engine throttle.
Anyone know problem or where to find parts or info??
THX, Rick

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Chek brushes...if they seemed ok then replace AVR card

Posted on Oct 11, 2009

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Check you throttle. You wount have any power until the generator spins quick enough the self excite/ start generating. The engine schould run at 3600 rpm.

Posted on Nov 30, 2011


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Hal, you may be able to adjust some what by changing engine RPM(throttle *****) and playing with the governor if need be with no load and with load.

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Honda eb5000 generator starts fine seems to run good but idle control does not work . will not rev up at all.i can turn carb idle screw in to bring revs up it makes power out of the generator but idle

Like a lot of stationary engines a generator engine is governed, or at least should be governed.

That is to say, when the engine is started it should be running at a predetermined speed which is not an idle speed but the speed the engine works most efficiently and that typically would be in the region of perhaps 1800 to 2500 rpm. In the case of an alternating current (ac) generator the speed will be determined by the alternator and the requirement of the frequency of the ac output to be around 50 to 60 cycles per second.

It is the function of the governer to maintain that preset speed within fairly close limits so when an appliance is connected to the generator and switched on the load increases and if it were not for the governer the engine would slow down which would be unacceptable. The governer therefore opens the throttle and restores the speed to the preset value. When the extra load is removed the engine will speed up momentarily and then restabilise at the right speed.

The governer is somethimes an engine driven set of bob-weights hidden inside the crankcase and sometimes nothing more complicated than a flap moving against a spring in the blast of cooling air from the fan. In all cases the governer is connected to the carburettor, typically by an adjustable link that includes a spring.

From your description it would seem the governer of your generator engine is jammed, broken, seriously maladjusted or simply no longer connected.

I hope this helps.

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The unit may need recalibrating the idle/run setting. Instructions found in manual at 8-6 (subaru engine) and 9-5 (kohler). Idle speed around 2200rpm. Simple screw adjustment. PDF manual here :-

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My 3000 watt Duracell inverter will not start a 1 1/2 hp electric motor. The voltage drops to 45v and the electric motor struggles to reach full rpm. This is a table saw with no load. The generator revs...

have the saw motor checked for internal and wiring problems
check the start/run capacitor of the electric motor
running a 1 1/2 hp motor (1075 watts) on a generator that has a running wattage of around 2250 watts means that it should start and come to speed immediately if the motor is good
the problem indicates that there is a circuit problem in the saw motor that is exceeding the available wattage (3000 watts ) on start up

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Throttle on generator question

The idle control switch allows the generator to go into idle when there is no demand form the appliances connected. This saves gas and increases the life of the generator. Damage can occur for some appliances like a refrigerator/freezer because the voltage and frequency are not prepared for the load resulting in a low voltage bad startup that will damage the appliance. Suggest that you leave the idle control switch off while any motor/electronic devices are connected.

The throttle control is likely a choke function for starting. These generators are designed for only one running speed to produce the necessary 60 cycles per second and voltage.
The following link is to a Canadian web site that later in the detail report describes the concern of idle control. In addition it provides good insight to the operation and use of portable generators

Hope this helps?
Understanding Portable Generators

The user manual see pages:


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Check charging system light and check battery light come on at begining of low idle. voltage at battery terminals during high idle was 14.5 vdc, and at low idle 12.65 vdc. engine speed did not seem to...

Your generator is pcm controlled. So is the charge indicator. Any charging system trouble codes? The gencom circuit is signal from pcm to generator. The genmon signal is from generator to pcm. Even at idle if you turn on a load, there should be a reaction, engine speed may increase as well as generator output. By load,I'm talking about headlamps or hvac something. At the moment I can't rule out your generator? I hate to see you replace anything and it not fix it?

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Alternator problem?

check battery voltage with engine off. should be @ 12.5v
check with engine running at about 1500 rpms. It should be @ 14 volts. If yes, it is ok. I think you are ok.
Please rate higly if htis helps

your system is more sophisticated than Sars can handle.

here's how it works.

The charging system consists of a generator which generates current to supply the vehicle electrical system and maintain the battery in a charged condition.
The generator is driven by the accessory drive belt. For additional information, refer to Section 303-05 . When the engine is started, the generator begins to generate alternating current (AC) which is converted to direct current (DC) internally. The DC current is controlled by the voltage regulator (located on the back of the generator), and then supplied to the battery.
The charging system voltage is controlled by the powertrain control module (PCM). The generator charges the battery and at the same time it supplies all the electrical loads that are required. The battery is more effectively charged with a higher voltage when the battery is cold and a lower voltage when the battery is warm. The PCM is able to adjust the charging voltage according to battery temperature by using a signal from the intake air temperature (IAT) sensor. This means that the voltage setpoint is calculated by the PCM and communicated to the regulator by a communication link.
The PCM simultaneously controls and monitors the output of the generator. When the current consumption is high or the battery is discharged the system is able to increase the idle speed.
To minimize the engine drag when starting the engine, the PCM controls the generator. The generator does not produce any output until the engine has started. The PCM then progressively increases the output of the generator.
The PCM controls the operation of the charging system warning indicator in the instrument cluster. The PCM is therefore responsible for turning the warning indicator off after the engine is started and illuminating it under fault conditions (when the generator is not generating the correct amount of current with the engine running). The warning indicator will also be illuminated by the PCM at key - on engine off and stall conditions.

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UST GG5500 generator no A/C output when I first start

Plug something into the outlet and have the breaker on when you start the generator. If it has an automatic idle control, turn that on too. A load will energise the generator.

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Yamaha ef1000 will only idle and produce 12 vac

Hi, I have the same generator and I pull the load and it is fine. The engine RPM is controlled by the 
governor. The voltage will not come up until the RPM is at full. First see what the RPM problem is and then check the voltage. Open the cover and look to see if the carb linkage is hooked up , if it is you mite have carb problem and address that first. Hope that helps.  

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My generator does not throttle up automatically

Hi there,
I've posted an answer to a somewhat related problem here
but you should read that later as I think you want a better idea of how the whole thing works.

Inside the control box on the generator the power leads get connected so that we have an L1, L2, and N feed wire with L1 and L2 being the 2 "hot" wires. Both of the hot wires pass thru a small current transformer (one wire in each direction) and then go to the various outlets in the output panel. The current transformer makes a signal whenever current is drawn thru either wire.

The current transformer sends its signal to an idle control circuit on a printed circuit board inside the control box. The other wires from this board go to the idle control switch, the power regulator/exciter board, and the idle control solenoid. The idle control board uses the DC voltage it gets from the regulator/exciter to energize the idle control solenoid if the idle control switch isn't in the "off" position and no signal has come from the current transformer for a sufficient time. The idle control solenoid acts to pull the throttle assembly until the throttle bell crank hits the idle adjustment screw (whew!)

Troubleshoot it like this:
1 - Does the engine start at governed speed and then idle down or does it start at idle? If it starts at idle, or seems to idle down faster than usual, something might be amiss in the works.

2 - When you turn the idle control switch to "off" does the engine rev up to governed speed immediately? If not there is almost certainly something ugly going on.

3 - With the idle control solenoid unplugged from the idle control board does the engine rev up to governed speed? If it won't you need to check to see if the plunger is stuck on the idle control solenoid. Some solenoids also have an adjustment that can get loose, check the voltage on the wires coming out of the idle control board if you're in doubt about its being energized or not.

4 - If the generator revs up when you turn the idle control off, but won't do it automatically when current is drawn with it turned on you need to check the current transformer with an ohm meter. Even though this is an AC signal you should mark the leads when you take them off so that they go back from whence they came - it's a noise thing ;-) Little square current transformers in Coleman Powermates are usually somewhere in the 1 - 2 Kohm range, failures are typically that the coil opens up.

Rank me when you've completed repairs?

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