HIP-1500 psw inverter

[T1 Terry]

Can you see 3 blue dash pots on the circuit board? I can only see 2 from the camera angle. You need to remove the circuit board and check the condition of the solder under each of the transistor legs ( the one clamped to the sides as well as the one under neither that isn't clamped for some silly reason) If the solder joint looks anything but perfect each poorly soldered unit will need to be replaced, it has suffered heat stress. also check the condition of the insulating heat transfer sleeves, if they have bee cooked they may well be shorting to the case. I'm guessing here as to that being the reason for the sleeves rather than heat transfer paste.
If you find a few of them you may be heading into value for money/effort territory here as there is no guarantee other bits have not been damaged as well.

[spybo]

Thanks Terry
The other dash pot is behind the copper coil on the left side
I will take a look as you have suggested in the next few days

[oldtrack123]

Hi all
I have a HIP-1500 psw inverter.
It had been working great running toaster, hair dryer and coffee machine.
Was testing it with the hair dryer and it was turning off and on as though it was overloaded
Put power meter on it and it was only 1350w which normally it will easily run for over 10 mins

On testing found the volts to be 213 volts and the frequency 50 hz and sometimes 60hz

Is it a bin job or can it be adjusted

Any help appreciated

Thanks Andrew.

HI Andrew
Before you make any rash decisions
Have you done a voltage input check ,to see if it is supply voltage related ???
ie connect voltmeter DIRECT TO THE INVERTER INPUT TERMINALS
Observe voltage as you apply a 240V load to the output
Does it always drop out at the same input voltage?
What is that voltage??

That is the first basic test that any technician would do, before ANYTHING else is considered.

PeterQ
.

[T1 Terry]

These inverters scream blue murder when the voltage goes low, you couldn't miss it

[spybo]

Ok Terry

I have pulled it apart
The sleeves are good no burning marks they are the same both sides
Checked the transistors and were all soldered well with no discolouration on any of the joints
On inspection with magnification glasses i found 3 bad solder joints
one a capacitor
one a fuse connector
and one was a crack in the solder connection for a transformer, re-soldered them, reassembled and refitted in motor home

Tested with fan heater 900w and vacuum cleaner 350w for about 5 mins

Voltage started at 243v with no load and droped to 239 volts at end of 5mins
Frequency stayed at 50hz

Will give it a few more tests tomorrow

Thanks for everyone's advice and fingers crossed it is ok

Andrew.