Power supply trips CU...

[RobH]

I bought a 12volt 8.5amp TDK Lambda power supply from Radio Spares to
replace a Mean Well 12v 8.5a supply which had failed after 3 years.

https://uk.rs-online.com/web/p/embedded-switch-mode-power-supplies-smps/8139099/?sra=pstk

I connected it up to a 3 pin plug with a 13A fuse. When I plugged it in
to an extension socket, which had a 13amp fuse, to check the output
voltage, it tripped the CU , and the said extension socket blew the fuse.
Any ideas as to why.

Thanks

 

[Andy Burns]

RobH wrote:

> it tripped the CU

MCB or RCD?

 

[RobH]

On 28/10/2020 15:57, Andy Burns wrote:

RobH wrote:

it tripped the CU

MCB or RCD?

I don\'t know, how can I tell.

 

[RobH]

On 28/10/2020 16:01, RobH wrote:

On 28/10/2020 15:57, Andy Burns wrote:
RobH wrote:

it tripped the CU

MCB or RCD?

I don\'t know, how can I tell.

It\'s a Concactum DDS10166-P01 CU, just installed about 18 months ago

 

[Andy Burns]

RobH wrote:

Andy Burns wrote:

MCB or RCD?

I don\'t know, how can I tell.

Does the individual breaker that tripped have a \"test\" button on it?

 

[RobH]

On 28/10/2020 16:07, Andy Burns wrote:

RobH wrote:

Andy Burns wrote:

MCB or RCD?

I don\'t know, how can I tell.

Does the individual breaker that tripped have a \"test\" button on it?

Yes it does, about 40mm to 70mm from the right hand side

 

[Andy Burns]

RobH wrote:

Andy Burns wrote:

Does the individual breaker that tripped have a \"test\" button on it?

Yes it does, about 40mm to 70mm from the right hand side

Implies earth leakage from the power supply, nothing rattling around
inside the PSU, or stray strands of wire where it\'s been connected?
(could also explain it blowing a fuse)

 

[RobH]

On 28/10/2020 17:00, Andy Burns wrote:

RobH wrote:

Andy Burns wrote:

Does the individual breaker that tripped have a \"test\" button on it?

Yes it does, about 40mm to 70mm from the right hand side

Implies earth leakage from the power supply, nothing rattling around
inside the PSU, or stray strands of wire where it\'s been connected?
(could also explain it blowing a fuse)

No, nothing is rattling around inside the PSU, and the 3 core mains
cable is securely screwed up in the 3 separate connections for +V ,-V
and GND.

 

[Andy Burns]

RobH wrote:

the 3 core mains cable is securely screwed up in the 3 separate
connections for +V ,-V and GND

Err shouldn\'t it be wired to L, N and GND?

 

[RobH]

On 28/10/2020 17:12, Andy Burns wrote:

RobH wrote:

the 3 core mains cable is securely screwed up in the 3 separate
connections for +V ,-V and GND

Err shouldn\'t it be wired to L, N and GND?

Ok but on the front of the psu is hows +V, -V then GND , then L and N
That\'s from left to right.
Have I wired it wrong , and it should be L,N and GND, doh!

 

[Andy Burns]

RobH wrote:

on the front of the psu is hows +V, -V then GND , then L and N
That\'s from left to right.

That\'s what I saw on the RS photo

> Have I wired it wrong , and it should be L,N and GND, doh!

sounds like it, presume it now has \"that smell\"?

 

[Andy Burns]

RobH wrote:

on the front of the psu is hows +V, -V then GND , then L and N
That\'s from left to right.
Have I wired it wrong , and it should be L,N and GND

Well, I wasn\'t talking about the order of the connections, merely their
labels, you should have brown to L, blue to N, and green/yellow to GND

with perhaps red(?) to +V and black(?) to -V on the output side.

 

[RobH]

On 28/10/2020 17:44, Andy Burns wrote:

RobH wrote:

on the front of the psu is hows +V, -V then GND , then L and N
That\'s from left to right.

That\'s what I saw on the RS photo

Have I wired it wrong , and it should be L,N and GND, doh!

sounds like it, presume it now has \"that smell\"?

No couldn\'t smell anything as the CU tripped immediately I plugged it in .
I\'ll re do it and try again later now.

 

[RobH]

On 28/10/2020 17:50, Andy Burns wrote:

RobH wrote:

on the front of the psu is hows +V, -V then GND , then L and N
That\'s from left to right.
Have I wired it wrong , and it should be L,N and GND

Well, I wasn\'t talking about the order of the connections, merely their
labels, you should have brown to L, blue to N, and green/yellow to GND

with perhaps red(?) to +V and black(?) to -V on the output side.

Wiring it L,N and GND helps. It powers up ok, but there is no output so
something has gone on the inside when I wired it incorrectly.

 

[Andy Burns]

RobH wrote:

Wiring it L,N and GND helps. It powers up ok, but there is no output so
something has gone on the inside when I wired it incorrectly.

I would have said I wasn\'t surprised it died ... except if I read the
specs correctly it should withstand 500V AC applied to the output for 60
seconds? Maybe that\'s only when applied from +V to GND, not +V to -V

 

[RobH]

On 28/10/2020 19:36, Andy Burns wrote:

RobH wrote:

Wiring it L,N and GND helps. It powers up ok, but there is no output
so something has gone on the inside when I wired it incorrectly.

I would have said I wasn\'t surprised it died ... except if I read the
specs correctly it should withstand 500V AC applied to the output for 60
seconds?  Maybe that\'s only when applied from +V to GND, not +V to -V

Me too actually, and thanks for your input