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How often do switch contacts become welded closed?
On 08/06/2018 09:50, Harry Bloomfield wrote:
It happens that Archibald Tarquin Blenkinsopp formulated : Welcome to* DC land. Switching DC is always a problem. My caravan mover has two motors each drawing upto 90amps, switched by relays, operated by a remote control. It could be disasterous for the relays to weld up, so the relays are doubled up in series. Should one of the relays fail to release, hopefully the second one would release. The control system then goes into fault until the welded contacts are freed up. It is fairly easy to get them to weld, by inching to rapidely. It is usually easy to clear with just a smart tap on the control box, with the power off. Go solid state? eg. https://www.ebay.co.uk/itm/100A-High...-/172015803320 |
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