Hi fellow enthusiast !
I am bulding a gate opener circuit to drive a 1/2 hp
24 v DC motor for our vehicle gate. the gate is 12 ft
long, 7 feet tall, wide and weighs about 200 pounds.
The sudden start and stop from my controller is really
stressing out the mechanical parts. another challenge
is that it is not quite on level ground, there is a slight
downslope on the closing run so I need at least a 3
second decel from 100% to 30% to handle the down
slope additional momentum on the "close" run.
so I need to add to this, a circuit that can take
about 2 seconds to go from a .5v output, to a 10 v
output, run until a limit switch either closes or opens,
and then ramp down from the 10 v to .5 volts in
about 3 seconds.
The motor controller I am using is a Dart 65E40
and it has 2 methods of control, 100% on / 0% off,
or a 0 -to- 10 volt speed control input. at zero
volts it runs the motor at 30% and at 10volts 100%.
The annoying part is that the designers included in
this controller a 0 -to- 10 second adjustable
acceleration adjustment, but only a fixed .5 second
deceleration mode ??? rats... I tried it and it is too
short for decel to be useful on the close mode especially !
I have been studying and collecting the many
versions of the Slow on / Slow off light dimmer
controller, to see if I could use it as a staring point
but I don't have the level of design experience to
modify the existing slow on / slow off circuits to
do the ramp up / run / ramp down pattern I need.
Since I am using dual 12v bateries to run it all
I also have the option to cut-out one of the batteries
as a slow down method as well when the motor gets
shut down to only 12 volts. but even on 12v it still
needs the soft start n stop.
who might know of any basic circuits that could
do this ramp up / run / ramp down pattern ?
or maybe a few separate circuits I could run in
series ?
thanks ... // Tom \\ Dallas Texas
I am bulding a gate opener circuit to drive a 1/2 hp
24 v DC motor for our vehicle gate. the gate is 12 ft
long, 7 feet tall, wide and weighs about 200 pounds.
The sudden start and stop from my controller is really
stressing out the mechanical parts. another challenge
is that it is not quite on level ground, there is a slight
downslope on the closing run so I need at least a 3
second decel from 100% to 30% to handle the down
slope additional momentum on the "close" run.
so I need to add to this, a circuit that can take
about 2 seconds to go from a .5v output, to a 10 v
output, run until a limit switch either closes or opens,
and then ramp down from the 10 v to .5 volts in
about 3 seconds.
The motor controller I am using is a Dart 65E40
and it has 2 methods of control, 100% on / 0% off,
or a 0 -to- 10 volt speed control input. at zero
volts it runs the motor at 30% and at 10volts 100%.
The annoying part is that the designers included in
this controller a 0 -to- 10 second adjustable
acceleration adjustment, but only a fixed .5 second
deceleration mode ??? rats... I tried it and it is too
short for decel to be useful on the close mode especially !
I have been studying and collecting the many
versions of the Slow on / Slow off light dimmer
controller, to see if I could use it as a staring point
but I don't have the level of design experience to
modify the existing slow on / slow off circuits to
do the ramp up / run / ramp down pattern I need.
Since I am using dual 12v bateries to run it all
I also have the option to cut-out one of the batteries
as a slow down method as well when the motor gets
shut down to only 12 volts. but even on 12v it still
needs the soft start n stop.
who might know of any basic circuits that could
do this ramp up / run / ramp down pattern ?
or maybe a few separate circuits I could run in
series ?
thanks ... // Tom \\ Dallas Texas