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Discuss Roller door not working in the Electrical Forum area at ElectriciansForums.net

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Hi guys,
I have a 3 phase roller door not working. These are my readings?

L1-L2 418v
L2-L3 419v
L1-L3 415v
L1-N 134v
L2-N 255v
L3-N 247v

After checking L1 and Neutral I thought it was a neutral problem but why is it ok for L2 and L3?!?!
Thanks
 

telectrix

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got to be a poor connection. might get a decent reading on meter, but fails under load. i'd be looking closely at L1. and if there's a contactor in there, that might be suspect.
 

Lucien Nunes

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Could a broken neutral. If the single phase control circuit runs from L1 as usual, it will reduce L1- N and increase the others. 255V is too high for 419V L-L. Dead test the neutal continuity.
 
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