This is my first time attempting a counter EMF circuit.
The project is a Marine Autopilot Motor Drive. It uses a reversable 18amp, 12vdc brush type motor. The LED's are to show pump direction. I wish to control voltage spikes coming back to the digital controller and other system components. The relays are rated 30 amps, with 12v coils, with built in surge supression resistors. I do not have the coil resistance or how much power they need.
The attached image shows two back to back zener diodes across the motor terminals.
My questions are:
Will the surge resistors protect the polarity lights?
Are the two 20v zener diodes sufficient to absorb spikes from the motor windings?
Thanks for any help and comments.
The project is a Marine Autopilot Motor Drive. It uses a reversable 18amp, 12vdc brush type motor. The LED's are to show pump direction. I wish to control voltage spikes coming back to the digital controller and other system components. The relays are rated 30 amps, with 12v coils, with built in surge supression resistors. I do not have the coil resistance or how much power they need.
The attached image shows two back to back zener diodes across the motor terminals.
My questions are:
Will the surge resistors protect the polarity lights?
Are the two 20v zener diodes sufficient to absorb spikes from the motor windings?
Thanks for any help and comments.
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