Hi guys
So here is a 'weird device' it is an IKON IP-450 A2 Paper laminator
The customer says it was warming up then suddenly tripped out the 220V mains
He replaced the 5A fuse which had blown but it did the same thing straight away as soon as powered on, it trips out the power in his apartment. He tried another power lead and tried it at a friends address but the same occurs
So he brought it to me, having fitted a new fuse again.
I plugged it in and it worked fine - it was drawing about 3Amps and warmed up to maximum working temperature no problem in about 5 mins.
Having scratched my head as to why, it occurred to me the only thing I was doing different was that I had it connected to my 220V isolation transformer.
So I connected it to a normal power outlet, it blew the fuse instantly and tripped the mains out. The fuse is vapourised.
I then replaced the fuse, put it back on the 220V isolation transformer and it works fine
Thing is I can't see any shorts to explain this, either across the power or to ground. The heating element does read short circuit on my multimeter, but it obviously works OK.
The only thing I can see is one of the plastic terminal blocks that connects the power to the heating element has melted and looks a mess, but there is no short form this terminal to ground or to the screw next to the terminal block
So what's going on and why does it work on the isolation transformer?
So here is a 'weird device' it is an IKON IP-450 A2 Paper laminator
The customer says it was warming up then suddenly tripped out the 220V mains
He replaced the 5A fuse which had blown but it did the same thing straight away as soon as powered on, it trips out the power in his apartment. He tried another power lead and tried it at a friends address but the same occurs
So he brought it to me, having fitted a new fuse again.
I plugged it in and it worked fine - it was drawing about 3Amps and warmed up to maximum working temperature no problem in about 5 mins.
Having scratched my head as to why, it occurred to me the only thing I was doing different was that I had it connected to my 220V isolation transformer.
So I connected it to a normal power outlet, it blew the fuse instantly and tripped the mains out. The fuse is vapourised.
I then replaced the fuse, put it back on the 220V isolation transformer and it works fine
Thing is I can't see any shorts to explain this, either across the power or to ground. The heating element does read short circuit on my multimeter, but it obviously works OK.
The only thing I can see is one of the plastic terminal blocks that connects the power to the heating element has melted and looks a mess, but there is no short form this terminal to ground or to the screw next to the terminal block
So what's going on and why does it work on the isolation transformer?
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