Nightjar wrote:

On 22-Jan-17 1:06 PM, Harry Bloomfield wrote:
It happens that Caecilius formulated :
Thanks. That sounds like it might work. I'll sketch it out and see if
it's workable.

Be very aware that contacts can and do sometimes weld up, so mechanical
interlocking is essential.

What should be interlocked? The whole idea of the setup is that each
contactor operates separately from the others.

The potential hazard is that if the main contacts on one of the
contactors weld closed, then the system closes another contactor,
it thus creates a potential phase-phase connection.

If the contactor has auxiliary contacts, so long as their state
mirrors the main contacts if they are welded, then the safety
interlocking can be electrical.

Chris
--
Chris J Dixon Nottingham UK


Plant amazing Acers.