Modification of 55 V DC motor control with counter-current braking

@markoa7

Modification of a 55 V DC motor control with counter-current braking; I’ll keep relay logic intact while using PWM1 for winding in and removing PWM2. In a prior 55 V drive, I reduced coast time by 60% with a well-timed 100 ms braking pulse; portfolio: https://www.freelancer.com/u/markoa7 - Consolidate S1 PWM1 path for winding in with adjustable speed. - Implement a single-shot 100 ms pulse on S2 release to trigger S1 braking, with 20-50 ms dead time. Clarifying question: Given the braking sequence timing, what tolerance is acceptable for the approx. 100 ms S1 braking pulse and the 20–50 ms dead time in your hardware, and are there EMI/interlock constraints I should design around? Happy to hop on a quick call to discuss Marko Aleksic

@sakshis576

As an experienced circuit designer, I understand the intricate requirements of your project and can create the necessary modifications to your 55 V DC motor control system with ease. My extensive proficiency in Circuit Design and Embedded Systems enables me to comprehend complex relay logics and optimize existing circuits while retaining their original functionality. Being a versatile professional, I propose introducing a time-delay relay/Pulse function which generates a single, brief pulse followed by a dead time between the deactivation of S2 and the counter-current pulse. This arrangement is intended to offer adjustable, optimal braking times (50-500ms) that could be determined empirically at a later stage while simultaneously preventing the two directions of rotation from being active simultaneously.

@mahmoudralizadeh

Hi, So the goal is to drop PWM2, run the unwinding direction straight from 55 V, and add an automatic counter-current brake: when S2 is released, the extension direction drops out, a short dead time passes, then the winding-in direction is triggered for about 100 ms, and the two directions are never active together. My approach is to keep your existing relay and power stage untouched and add a small falling-edge one-shot timing stage that simply imitates the existing S1 command. It would have two adjustable trimmers: dead time (20-50 ms) and pulse width (50-500 ms). The timing stage would run from a small regulated low-voltage rail derived from the 55 V supply. For break-before-make safety, the extension relay must be confirmed off before the braking pulse can start. S1 always keeps priority over S2 and over any pending brake pulse, and if S2 is pressed again mid-pulse, the pulse is cancelled cleanly. Deliverables: revised circuit diagram, parts list with values, timing calculations, and a short tuning guide so you can find the best braking time on the real machine. Quick question: are your existing relay coils driven at 55 V or from a lower rail? That decides the output stage of the timer.

@ssumitkumar7800

With my extensive background in Electrical Engineering and skill set in Embedded Systems and Signal Processing, I am confident that I can deliver exceptional results for your project. Building on my experience in PCB and PLC programming, I assure you a customized modification of your 55 V DC motor control system to flawlessly incorporate an automatic plugging function with counter-current braking. I understand the priority of S1 and will ensure that its behavior remains unchanged while seamlessly integrating the necessary changes for S2. Your desired time-delay relay/pulse function combining a single-shot triggering capability with adjustable pulse duration within 50–500 ms aligns perfectly with my proficiency in signal processing. Moreover, I am adept in designing reliable break-before-make switching systems to ensure safe operation.

@juliantobahari

Hi, I'm Juli, a 3D design specialist. I've read your job description and I’m confident I can help. I have solid experience with SolidWorks, Fusion 360, and rendering tools like KeyShot. I focus on precision, fast delivery, and clear communication. I understand the requirements of Modification of 55 V DC motor control with counter-current braking and how to approach it effectively. You can also see similar work on my portofolio. Looking forward to hearing from you. Best regards, Juli

@hamzaePCB

Before defining the braking pulse circuit, I would first verify the existing relay power stage. During plugging, the motor is still rotating when reverse voltage is applied, so the braking current can be significantly higher than the normal running current. Could you confirm the motor’s rated current/stall current and the exact part numbers or current ratings of the four existing reversing relays and PWM1? I would keep the existing relay logic where possible and add a falling-edge triggered, non-retriggerable braking pulse with an explicit break-before-make dead time so the two directions cannot overlap.

@Ahmadali9876

Are you looking for a 55V DC Motor Control & Relay Logic Expert? I am Muhammad Ahmad. I have 5+ years of experience in electrical control systems, relay logic, DC motor control, PWM systems and circuit design, and I can modify your existing 55V DC control circuit while preserving the current relay/power stage as much as practical. I understand the required sequence: eliminate PWM2 completely, retain PWM1 for S1/retraction, provide direct 55V operation for S2/extension, and generate one falling-edge braking pulse when S2 is released. Deliverables Modified 55V DC control circuit PWM2 completely removed PWM1 retained for S1 Direct 55V S2 operation Adjustable counter-current braking pulse Break-before-make interlock S1 priority logic Re-trigger protection during braking Complete sequence verification New circuit diagram in JPG format Component/timing recommendations Why Choose Me I’ll focus on the actual switching sequence and fail-safe interlocking, not simply adding a timer relay. The existing relay/power stage will remain responsible for motor switching wherever practical, reducing unnecessary changes to the system.

@oleksandrp60

Hi, I’ve built multiple relay-controlled DC motor systems with PWM controllers, time-delay relays, and break-before-make interlocking, so this is straightforward. I’ll modify the existing 55 V DC relay logic by removing PWM2, routing S2 directly through the 55 V supply, and retaining PWM1 for adjustable S1 winding-in speed. I’ll implement a non-retriggerable falling-edge single-shot using a 55 V-compatible timer relay or interface relay, with adjustable 20-50 ms dead time and approximately 50-500 ms braking pulse duration. The sequence will be interlocked as S2 OFF, extension OFF, dead time, S1 ON, then S1 OFF, ensuring S1 priority and preventing simultaneous motor directions. I’ll verify re-actuation behavior, relay coil/output ratings, and break-before-make timing against the existing circuit. Deliverables include the revised circuit diagram in JPG format, wiring notes, component specifications, and clear setup instructions. I can start immediately. Thanks, Oleksandr

@joshlui

<<<✔Consider it DONE✔>>> YO! I understand your project and I'm eager to help. As an AI and automation specialist, I'm uniquely equipped to handle the highly technical aspects of your motor control system modification project. I have a proven track record of designing and implementing complex circuits, and my experience with WordPress and APIs ensures I have the technical know-how to deliver a circuit diagram that meets your requirements. What sets me apart is my commitment to providing solutions that align with your business goals. In this case, I understand that ensuring reliable break-before-make switching is essential for your system's safety, and my attention to detail guarantees that this will be implemented effectively. Looking forward to being part of your project! You will surely be impressed by my work! Not sure what the next step is? I offer free and professional consultation -- I'm just a text away. All the very best, Josh

@Wame769Swart

I see you're looking to modify your existing 55 V DC motor control circuit to include automatic plugging for effective counter-current braking. This involves retaining relay logic while eliminating one PWM controller, which aligns with projects I've successfully completed in the past. To achieve effective braking, I recommend implementing a time-delay relay that generates a brief pulse upon S2 release. This pulse can be adjustable to fine-tune the braking duration, ensuring optimal performance. My experience with circuit modifications and relay logic will ensure a seamless integration of these changes. I specialize in designing reliable control systems that meet strict operational requirements. Could you clarify how you envision the adjustment of the pulse duration? Also, what specific components do you currently have that could be reused in this modification? Let's talk, and if you're not satisfied, at least you get a free consultation. Regards, Wame769Swart