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