Why didn't my text upload in my initial post? Anyhow, here it is

Need a motor for a pedestal buffer/polisher I'm building. I followed the directions but for some reason the motor pulses on and off for roughly 0.5 seconds and repeats. I wasn't sure if the 10kΩ potentiometer had something to do with it so I tried a 200kΩ and I'm still getting the pulsing.

Any ideas on what I may be doing wrong?

Minark's wiring instructions:

DC motor control:
MM23001C by Minark

DC treadmill motor:
Baldor
1.5 hp
90 volt
14.5 amp
4,800 rpm

Power:
110v AC

Many thanks,
Dave

 

For starters, I would make decent connections instead of twisted wires to terminals!

 

The 200k pot is soldered. Just soldered the 10k and still pulsing so no dice!

 

Try it with a lighter load, e.g. 120v lamp.
Have you set the pots? current limit etc?

 

Test a lamp with the potentiometer? I'm not sure how I would wire that.
I've never set a current limit before and don't know how to do that.

I took the pots from another setup that works perfectly fine so there is nothing wrong with them. Anything else that might be wrong?

Anyone with any ideas I can try? Thanks

 

Any feedback/RPM sensors required by the controller ?

 

The manual for the MM23001C that I found online suggests that for a 90 volt motor the maximum power rating is 1 HP.
I think the over current protection circuit is working to protect the controller.

Les.

 

The manual for the MM23001C that I found online suggests that for a 90 volt motor the maximum power rating is 1 HP.
I think the over current protection circuit is working to protect the controller.

Les.

I second that thought. That was the first thing that came to my mind - overload protection kicking in and out.

 

The almost identical SCR bridge units sold by the popular KB Electronics require a plug-in resistor, selection value dependent on motor HP.

 

Test a lamp with the potentiometer? I'm not sure how I would wire that.
I've never set a current limit before and don't know how to do that.

I mean to use a 100w lamp in place of the motor, you should have a manual that gives you the set up procedure for the pots on the bottom row of the board.

 

Didn't think I would get this many replies. Thank you to everyone for offering your ideas! I called the manufacturer of the speed controller and the technician told me to simply turn down the IR Controller and it would get rid of the pulsing. He said he get's that question all the time and it's always the IR Controller. I tried it and the motor works smoothly and is ready to be put to use. I also had a 25 year old controller from the same manufacturer that was hooked up to my vertical metal cutting bandsaw and the motor also pulsed and I left it alone for a long time. I turned down the IR Controller knob and the bandsaw works great! Man, wished I took the time to phone Minarik Corp a long time ago.

Again, thank you all!

 

Man, wished I took the time to phone Minarik Corp a long time ago.

It pays to read the set-up instructions, presumably you had them if purchased new, usually on the site anyway for most manuf.
As per post #13 !

 

Your power supply is sensing an over-current situation. It retests every 0.5sec and shuts down, repeat. You need a smaller motor or a bigger (higher current output) power supply.

 

It pays to read the set-up instructions, presumably you had them if purchased new, usually on the site anyway for most manuf.
As per post #13 !

It also is important to understand the question before you offer advice.
I stated that "I watched the Youtube video from the manufacturer and wired everything up as they said".
I assumed they told me everything I needed to know. <Mod:deleted offensive remark>

 

You have a good day too !

 

The picture of the controller module shows six adjustment pots and I am sure there is at least one of those for setting the current limit. Probably one also sets the maximum accellaration rate. If the motor draws excessive current then the controller will switch off until the excess is gone.