- Joined
- May 20, 2017
- Messages
- 161
Are you sure your motor controller is not a KBMD rather than a KBMC? My search returned only KBMC - a simple DC controller with reversing.
I just provided the simple control logic - typically 120V - but you can configure as you need and even run it at 24 VDC if you need - just size your devices accordingly.
Braking before you open the doors or braking while the doors are open, etc changes the problem a bit. You can either brake the hard way with mechanical means such as a brake pad arrangement like in your car, or you can momentarily plug reverse by reversing motor direction for some interval and driven by a time delay device as suggested by Mr. Dawson. I don't know what having shop air buys you other than to make the project more complicated than you need, and introduce additional dependencies - for instance, if you rely on shop air to provide braking similar to air brakes on trains, then you need to ensure you have air pressure available before you can even actuate power to the motor, etc.
Probably the best way in your case is to have a spring-loaded mechanical braking system that is always engaged unless power to the motor is available - that is, have a solenoid parallel with the motor control circuit to engage the brakes upon loss of power - whether that loss is because someone inadvertently opened the gates or a command to STOP instruction.
I just provided the simple control logic - typically 120V - but you can configure as you need and even run it at 24 VDC if you need - just size your devices accordingly.
Braking before you open the doors or braking while the doors are open, etc changes the problem a bit. You can either brake the hard way with mechanical means such as a brake pad arrangement like in your car, or you can momentarily plug reverse by reversing motor direction for some interval and driven by a time delay device as suggested by Mr. Dawson. I don't know what having shop air buys you other than to make the project more complicated than you need, and introduce additional dependencies - for instance, if you rely on shop air to provide braking similar to air brakes on trains, then you need to ensure you have air pressure available before you can even actuate power to the motor, etc.
Probably the best way in your case is to have a spring-loaded mechanical braking system that is always engaged unless power to the motor is available - that is, have a solenoid parallel with the motor control circuit to engage the brakes upon loss of power - whether that loss is because someone inadvertently opened the gates or a command to STOP instruction.
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