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Tech Head - The Technology Section
The Work Bench and Soldering Station
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<blockquote data-quote="Waveguide" data-source="post: 914076" data-attributes="member: 364636"><p>Some types of relay switching of motors is safe if properly designed and the relays</p><p>are of the type "break before make". One type is the relay equivalent of a H-bridge.</p><p>Two two-pole relays with the contacts for one relay in the upper left and lower right</p><p>parts of the H. The other relay on the opposite diagonal. As long as both relays are</p><p>not ON the same time nothing can short the supply. The other variant is one relay</p><p>for On/Off in series with a relay to reverse the polarity to the motor. This has to</p><p>be "break before make" or the supply could be shorted when reversing with power</p><p>to the motor.</p><p> </p><p>A brief shorting of the supply could explain why no transient suppression works,</p><p>the 24 V is gone and nothing fills the gap. Using another supply for 5 V will fix</p><p>the dropout.</p></blockquote><p></p>
[QUOTE="Waveguide, post: 914076, member: 364636"] Some types of relay switching of motors is safe if properly designed and the relays are of the type "break before make". One type is the relay equivalent of a H-bridge. Two two-pole relays with the contacts for one relay in the upper left and lower right parts of the H. The other relay on the opposite diagonal. As long as both relays are not ON the same time nothing can short the supply. The other variant is one relay for On/Off in series with a relay to reverse the polarity to the motor. This has to be "break before make" or the supply could be shorted when reversing with power to the motor. A brief shorting of the supply could explain why no transient suppression works, the 24 V is gone and nothing fills the gap. Using another supply for 5 V will fix the dropout. [/QUOTE]
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Tech Head - The Technology Section
The Work Bench and Soldering Station
V-Box blew up :(
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