Ok, I've run out of time and need to build a friend a controller for his homemade TRAM as he calls it. It is a trolly that one will sit in to go down a steep hill to the lake.
He has the following DC Motor
GE 1HP shunt wound motor.
Voltage: 90 arm. & 100 field
Amperage: 10.5 arm. & .76 field
(Does this motor have brushes?)
(Would it be easier to get another motor?)
So the goal is from either the top or bottom of the hill to manually push the FWD (or down) button. The Motor then lets a winch cable out until a limit switch is hit (ie latches ON-then shuts off) or the STOP button is pressed.
To go up, the motor is reversed and tightens the winch until the limit or until STOP is pressed. There is going to be 4 limit switches - two at each end and a buffer of distance between them. It would be nice that the controller would ignore the limit if the other direction is pressed. That is, if going down and the limit is reached the cart would go back up without having to reset the limit. The 2nd limit on the same end would require one to move the cart and will be used as a safety.
I explained the liabilities of latching and the lack of control and that your in for the ride until you hit the limit or if somebody else is standing by one of the two button boxes has control over you. Phase two, is I plan on making a wireless interface to this with a garage door phobe.
I've found several solutions to speed control, but it would be nice if it was in all-in-one solution.
My question is there a specific DC control device out there that you can recommend for $300 or less? I've searched Fleebay and read a lot on this useful site on general info, but haven't found anything specific.
I already have the limits and two sets of FWD, REV and STOP.
This "controller device" obviously would have to be compatible with the motor and have inputs for the FWD, REV, STOP and limits and hopefully speed control. Another obvious requirement is the controller should be able to handle the case where both up and down buttons are pressed at the same time.
I've dealt a little with PLCs 15 years ago in college, but after reading about ladder logic again it is very fuzzy. I could relearn if needed. Same goes for the PIC chip, and honestly I dunno if I have time.
I know this maybe a pipe dream, but after farting around so long I'm out of time. Maybe I have to design something, but I didn't want to reinvent the wheel.
Although I'm a EE, I am sad to say this simple task is starting to kick my but and it's going to get cold in MN soon.
BTW-I'm just charging him for parts so this is not something that I will make money off of. While reading the forums I saw that some are making money off from others sweat...Grrr, one of my pet peeves.
Any useful suggestion are appreciated! I thank you for your time.
Feel free to ask questions and it's 3am now so I gotta go to bed.
He has the following DC Motor
GE 1HP shunt wound motor.
Voltage: 90 arm. & 100 field
Amperage: 10.5 arm. & .76 field
(Does this motor have brushes?)
(Would it be easier to get another motor?)
So the goal is from either the top or bottom of the hill to manually push the FWD (or down) button. The Motor then lets a winch cable out until a limit switch is hit (ie latches ON-then shuts off) or the STOP button is pressed.
To go up, the motor is reversed and tightens the winch until the limit or until STOP is pressed. There is going to be 4 limit switches - two at each end and a buffer of distance between them. It would be nice that the controller would ignore the limit if the other direction is pressed. That is, if going down and the limit is reached the cart would go back up without having to reset the limit. The 2nd limit on the same end would require one to move the cart and will be used as a safety.
I explained the liabilities of latching and the lack of control and that your in for the ride until you hit the limit or if somebody else is standing by one of the two button boxes has control over you. Phase two, is I plan on making a wireless interface to this with a garage door phobe.
I've found several solutions to speed control, but it would be nice if it was in all-in-one solution.
My question is there a specific DC control device out there that you can recommend for $300 or less? I've searched Fleebay and read a lot on this useful site on general info, but haven't found anything specific.
I already have the limits and two sets of FWD, REV and STOP.
This "controller device" obviously would have to be compatible with the motor and have inputs for the FWD, REV, STOP and limits and hopefully speed control. Another obvious requirement is the controller should be able to handle the case where both up and down buttons are pressed at the same time.
I've dealt a little with PLCs 15 years ago in college, but after reading about ladder logic again it is very fuzzy. I could relearn if needed. Same goes for the PIC chip, and honestly I dunno if I have time.
I know this maybe a pipe dream, but after farting around so long I'm out of time. Maybe I have to design something, but I didn't want to reinvent the wheel.
Although I'm a EE, I am sad to say this simple task is starting to kick my but and it's going to get cold in MN soon.
BTW-I'm just charging him for parts so this is not something that I will make money off of. While reading the forums I saw that some are making money off from others sweat...Grrr, one of my pet peeves.
Any useful suggestion are appreciated! I thank you for your time.
Feel free to ask questions and it's 3am now so I gotta go to bed.