Problem with an unstable output of a DC to AC converter

[asimraufawan]

HI All!

A 2.5KW converter input 120 VDC & output 220-230 VAC.


The problem is when i run the converter under full load (11 Ampere) it gives 225 VAC output volt at 118-120 VDC input, after one hour it gives 222 VAC at output
& after two hours it gives 220 V AC at output then after sometime it comes to 219VAC & then the voltages starts fluctuating between 218-234 VAC, the max temperature rise is 65 degree Celcius which is under limit.

Why the output is not stable & what should i do to remove this bug.

It works fine at 10.2 Ampere (226 VAC at output)
the rated is 11 Ampere.

Please help

Thanks.

 

[srizbf]

Re: DC to AC converter

it is an indication of temperature effect.

what you said as within 65 deg may be for the entire enclosure .

some individual components temp may cross the specified limit at that load current.

since the situation happen at 11amps , measure the temp from the outpuside components traversing thro inner blocks.

srizbf
18thmay2010