Hello,
I am electrical engineer working in design and manufacturing of crane applications. For purpose of Hand/Auto switching we use two contactors operated at 400V AC. 1`st contactor A1 receive phase L1, 2`nd contactor A1 receive phase L2. A2 of both contactors receive phase from Hand/Auto switch which toggles between L1 and L2 phases. Problem arises when there is disconnection in toggled phase to A2 of contactors. Then contactor coils connected in series to 400V AC by phases L1 and L2. This causes contactors to shatter and burn eventually.
I want to implement diodes in series to contactor DC coils, so when toggled phase disconnects (failure or emergency) there will not be series connection between contactors coils.
Please advice in choosing right diodes and your thoughts on implementing this solution.
Thank`s in advance.
I am electrical engineer working in design and manufacturing of crane applications. For purpose of Hand/Auto switching we use two contactors operated at 400V AC. 1`st contactor A1 receive phase L1, 2`nd contactor A1 receive phase L2. A2 of both contactors receive phase from Hand/Auto switch which toggles between L1 and L2 phases. Problem arises when there is disconnection in toggled phase to A2 of contactors. Then contactor coils connected in series to 400V AC by phases L1 and L2. This causes contactors to shatter and burn eventually.
I want to implement diodes in series to contactor DC coils, so when toggled phase disconnects (failure or emergency) there will not be series connection between contactors coils.
Please advice in choosing right diodes and your thoughts on implementing this solution.
Thank`s in advance.
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