voltage control ramping to vibratory feeder tray
voltage control ramping to vibratory feeder tray
(OP)
Hello, I am new to your forum, what a wealth of knowlege and experience. My problem lead me here.I know you guys can help....I need to be able to control ramp up speed of a vibratory feeder tray ,say under $300.When I switch it on I want voltage to go from 0.volts to 115volts in three minutes or so.A pot to increase or decrease time would help allso. Ramping down to a stop is not important. FLA3amps/115volts Any help would be appreciated.





RE: voltage control ramping to vibratory feeder tray
How many horsepower is the motor? Perhaps the motor could be changed to 3 phase for less than $150?
RE: voltage control ramping to vibratory feeder tray
RE: voltage control ramping to vibratory feeder tray
RE: voltage control ramping to vibratory feeder tray
If the motor is of the Permanent Split Capacitor (PSC), Shaded Pole, or Universal (AC/DC) type, you will be able to do what you want, albeit the method may be different for a Universal. If it is of the Split Phase or Capacitor Start type, you will not. First determine which design you have.
"Venditori de oleum-vipera non vigere excordis populi"
RE: voltage control ramping to vibratory feeder tray
RE: voltage control ramping to vibratory feeder tray
http://www.stacoenergy.com/
RE: voltage control ramping to vibratory feeder tray
Many vibrating feeders use a small electric motor with an eccentric weight as the method of generating vibration. If your's doesn't, then you will need to determine how it is creating the vibration. Some do it with a PWM type DC controller, others with an AC solenoid type device. IF you have a little PC board or a "black box" that your 120VAC goes into, it is most likely a PWM style controller. Many of those have a ramping function built-in, are you sure your's doesn't? If it is electronic and it doesn't have a ramp function already, varying the voltage may not work. The electronic controller would likely just shut down.
If you have the solenoid type, you will have the AC wires going directly to what looks like a short plunger assemly, where the plunger vibrates up and down or back and forth. With that type, you may be able to ramp it by simple ramping voltage. In that case a small motorized pot like what sried mentioned would be the simplest method. Another alternative would be an SCR phase-angle voltage controller. Phasetronics makes a low cost unit called the EP-1 that would cost you around $140, but you would need to ask them to modify the ramp time to be 180 seconds instead of 60 seconds. They will do it for you if you ask nicely, it will just take longer to get it.
"Venditori de oleum-vipera non vigere excordis populi"
RE: voltage control ramping to vibratory feeder tray
RE: voltage control ramping to vibratory feeder tray
So the answer is yes, it could be. Not all DC motor controllers are PWM type however.
"Venditori de oleum-vipera non vigere excordis populi"
RE: voltage control ramping to vibratory feeder tray
can you tell us the manufacturer's WEB-site and the vibrators part number?
<nbucska@pcperipherals DOT com> subj: eng-tips
read FAQ240-1032
RE: voltage control ramping to vibratory feeder tray
RE: voltage control ramping to vibratory feeder tray
This particular type of vibratory bowl has electromagnets that attract a moving plate similar to the coil and moving armature in a motor controller coil. I have also worked with the types of vibratory finishers that use a motor and revolving weight, but these a 2 different animals as far as control is concerned.
Your 2 best best for controlling an electromagnet type vibrator are for a motorized variable autotransformer or to set up a variable frequency drive to produce variable frequency single phase power. For a motorized variable autotransformer you should use both a primary circuit breaker and a secondary circuit breaker set at slightly below the rating of the autotransformer. For a variable frequency drive you need to use an output inductance to absorb most of the carrier ( unwanted ) voltage and current. A variable frequency drive should also have in the output a thermal motor overload relay that is set to protect the electromagnet and the drive against overheating. In no case should any electronic or software overload relay in a variable frequency drive be trusted to work correctly. An autransformer or variable frequency drive with twice the current rating of the electromagnet would be reasonable.
Also, any bolts for the leaf springs that support these things will not work ( go off frequency ) if the bolts are loose by even 1/8th of a turn.
RE: voltage control ramping to vibratory feeder tray
RE: voltage control ramping to vibratory feeder tray
The motorized variac will be the easiest method since you are only adjusting the amplitude.
Also, in the case of a variable frequency drive do not expect the electromagnet to work below 10 Hertz or 15 Hertz. Even if you set up a voltage boost to compensate for magnet wire resistance at low voltage and frequency you could have problems with the system hitting a resonance as the frequency ramps up. My experience with shakers and vibratory finishers is that the first resonant frequency is below full operating speed say 2/3 of full speed.
The only thing that you really can do is to play around with both methods.
By the way, Lutron makes a heavy duty dimmer models HP-2, HP-4, and HP-6 that can be programmed for inductive loads up to 16 amps at 120 volts for each pole. The HP-2 is the single pole unit, the HP-4 the 2 pole unit and so forth. You can gang together up to 5 3-pole units. This has 24 volts AC self wetted control inputs for stop, full voltage, increase voltage, and decrease voltage. It also has a 120 volt AC analog control input but for your application you would not want that. It also has an adjustable voltage ramp rate when using the 24 VAC inputs. It should be more than robust enough for your application but your application **WILL** void the warranty. Same goes for using it to control paddle fans.
RE: voltage control ramping to vibratory feeder tray
RE: voltage control ramping to vibratory feeder tray
"Venditori de oleum-vipera non vigere excordis populi"
RE: voltage control ramping to vibratory feeder tray
reo-usa.com
RE: voltage control ramping to vibratory feeder tray
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