Is there a safe, possibly double insulated, means to derive a 12V DC power
supply when the motor control cabinet only has three phases or must I bring
an earth and neutral into the cabinet and connect a 240V wall wart to it?
This is to provide power to a gsm telemetry module.

If it is doable where might I buy one?

AJH

"andrew" wrote in message
...
Is there a safe, possibly double insulated, means to derive a 12V DC
power
supply when the motor control cabinet only has three phases or must
I bring
an earth and neutral into the cabinet and connect a 240V wall wart
to it?
This is to provide power to a gsm telemetry module.

If it is doable where might I buy one?

AJH

415v to 240v transformer feeding your wall wart - three phase has 415v
phase to phase and 240 (ish) phase to neutral so you take any two
phases as the 415v input to your transformer. Such transformers widely
used to power lights and such like on industrial machine with no
neutral feed. RS components stock them.

AWEM

Andrew Mawson wrote:

415v to 240v transformer feeding your wall wart - three phase has 415v
phase to phase and 240 (ish) phase to neutral so you take any two
phases as the 415v input to your transformer. Such transformers widely
used to power lights and such like on industrial machine with no
neutral feed. RS components stock them.


Thanks Andrew, that prompted me to have a look and JMS transformers made me
one with a 415V primary and 240V secondary ( for a heating time switch)
plus a 18V secondary with rectifier and smoothing capacitor (to supply the
gps device) Wired it all in today and it seems to work, as things are a bit
cramped I will check how warm everything gets in the morning.

AJH

"andrew" wrote in message
...
Andrew Mawson wrote:

415v to 240v transformer feeding your wall wart - three phase has
415v
phase to phase and 240 (ish) phase to neutral so you take any two
phases as the 415v input to your transformer. Such transformers
widely
used to power lights and such like on industrial machine with no
neutral feed. RS components stock them.


Thanks Andrew, that prompted me to have a look and JMS transformers
made me
one with a 415V primary and 240V secondary ( for a heating time
switch)
plus a 18V secondary with rectifier and smoothing capacitor (to
supply the
gps device) Wired it all in today and it seems to work, as things
are a bit
cramped I will check how warm everything gets in the morning.

AJH


Glad to help, nice to hear of a good result.

AWEM