![]() ![]() There is some protection built-in to RC4 dimmers, but it never hurts to add another external diode. Mechanical relays generate little snippets of back-EMF as well, when they release. This is called “back-EMF” (EMF is electromagnetic force). The diode absorbs that energy, preventing it from getting back into the dimmer electronics. In fact, when the motor is coasting, or being turned externally, it’s generating electricity in reverse polarity. That is, the diode will NOT conduct, so you might think it’s pointless. This is a high-current rectifier diode in the opposite polarity of power output. One more detail that matters more for large loads than small, but is a good idea in all cases: put snubber diodes across both dimmers, right at the dimmer outputs. A good choice would be 12V, but it can be anything from 6V to 24V when using our R3 dimmers or 6V to 18V with our older dimmers. Motor Control Board, YYB-5 12v 24v Motor Controller Drive Board Forward/Reverse Control Module for Solenoid Valve, Pumps, Motors, Lights 1 offer from 26. You’ll want to use a relay with a coil voltage that is the same as the motor, and run the whole thing at that voltage. #24v relay to select forward and reverse motor how toHere’s a diagram of how to connect the relay to an RC4Magic DMX2dim dimmer. If you send dimmed power to a relay, it will chatter and not switch reliably. Use a non-dim curve for the relay, to ensure it is either open or closed. Use the linear dimming curve for motor power. Connect the motor power through the contacts of the relay to provide one polarity when the relay is NO (normally open) and the opposite polarity when NC (normally closed). One dimmer provides motor power, the other dimmer drives the coil of the relay. You need 2 channels of DMX assigned to two separate DC dimmer outputs, a small DPDT (double-pole, double-throw) relay, and - of course - the motor or actuator.
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