Genset & UPS Problem

[Boant]

We have a small home office with six to seven pc workstations, printer, router and switch running thru a Tescom SS Pro 3300VA Pure Sine Wave UPS, we also have a Honda EP2500CX AVR genset with a rated output of 2000VA (Max Output 2200VA). When there is a power outage we unplug the UPS from the wall outlet and plug it into the genset that we have just started, for a "no power down switch-over".
This is where the problem starts, the UPS will start hunting on and off and will not permanently switch over to the gensets power. I have found a way to alleviate this from happening by also running a fan heater (at the 1000W setting) off the genset as well, this then somehow stops the UPS from hunting on and off and we can the run all the way through the load shed period, although the genset does sound like it is laboring/working hard when doing this workaround.
I have contacted the UPS supplier and they say it is the genset, the genset people say it is the UPS that is causing the problem.
Could this be that the gensets revs/frequency are not tuned correctly, I have also heard that some UPS's can also have their input frequency range adjusted as well.
If the generator is the problem and nothing can be done about it I was thinking of selling this Honda and going the more expensive option and getting a Honda, Yamaha or Kipor inverter genny as this would most probably sort the problem out for sure. Any thoughts on this?.

 

[ghostR]

You can generally change how high the geni revs, I know a friend of mine had this problem and after changing that, UPS's worked fine only when the geni dipped would the UPS switch over to battery power and then go back to normal.

 

[savage]

You are more than likely drawing too little current from the Genset (ideally, you want to be at +- 70% or 80% of max load).

If there's too little load on the generator, the voltages will not be optimal. Your UPS is cutting out because of the voltage spikes. When adding the heater, you increase the load on the generator and therefore the voltages are stable. The generator SHOULD sound like 'it is working hard'...

Put more load on the generator (you can also "tune" this by using 500W or 1KW lights for example), or believe it or not, get a smaller generator. With a multimeter (if you have one), a simple volt test will more than likely confirm the above. I highly doubt it will be stuff like frequencies and all that. If the frequencies don't match, they don't match. They won't change by themselves.

 

[Boant]

Thanks, will check the output voltage from the genset next time we run, and if it is out will get it adjusted.