Main Motor problem

[Staston Lombardi]

Hi , 

I used Mr Herb Winters  wiring diagram and  configuration for my extrusionbot 

I just connected it today , and i have a problem with motor that's not working ( main motor ) 

i think my pid configuration is ok as it doesn't turn on until the temp is ok , but when i turn it on i listen to small clicks ( repetitive sound ) without any turning of motor ,

another thing is that fan and spool motor work fine , but when i turn on the main motor they stop 

i've verified my connections  and you can help me on that issue 

[Herb Winters]

the repetitive clicking sounds I am guessing here are the power supply  shutting down. This will happen if the load is too high.

My guess is to check one of the following issues.

1.)    1.) The  motor is wired wrong. You said you checked this and from the sounds of what you have said it seem like it is trying to move the motor when it is supose to , so on to the next option.

2.)    2.) The gear box is bound up I have heard of one other person that this has happened to he fixed the problem by removing the motor assembly from the box grabbing the gear with a big pair of pliers and forcing it to turn he said it made a pop sound then it seem to work fine. The gear is hard to turn but you should be able to turn it with enough force and you wil hear the motor spin fast. Remember not to turn the gear fast as it it does not turn fast when running normally and if you do spin it fast you might risk breaking something.

3.)    3.) The motor is burnt out. To test it.  If you try step two and you have the motor out before you put it back in try connecting the motor to a car battery even though the car battery is only 12V it should run the motor fine it will just run a little slower than normal.

 Please Let us know  how it goes.

[Staston Lombardi]

thx for reply ; 

I've verified motor wiring again , ant it's ok ; 

Tested the motor alone with 12 V power suupply and it's ok too 

i've also turned the gear box and it moves without hard force. 

Reinstalled everything and still have the same problem . 

Thx for help .

[Herb Winters]

If you can run the machine until you hear the clicking then get the volt meter so that you can measure the voltage across the top two screws on the right side of the white terminal block it should measure 24VDC when things are running correctly. and it should always show 24VDC while the extruder Power key is on.

 

Let me know what you find

[Staston Lombardi]

24 V when the motor is off 

once I run the main motor it's 1 to 9 mV almost 0 

Thx

[Herb Winters]

how about if you take the chain off the motor with it run then?

[Herb Winters]

one other thing
 if the motor runs with the chain off which direction does it turn it should turn counter clockwise looking down at the gear from the top of the ExtrusionBot.

[Staston Lombardi]

Same thing without chain , motor doesn't run , and same sound .

[Herb Winters]

try measuring the voltage accross Pins 6 and 7 on the PID controller
here is the setup for this measurement:
turn on the key switch turn off the heat and turn on the main motor switch.
first measure the voltage while it is still not up to temp this should give you the full voltage across those two pins. if the voltage is 24VDC or less then put the multimeter in amps scale and put the leads across pins 6 and 7 on the pid controller again this should give you a current. for the motor or it will shut down the power supply again. (the meter should be on a 2 amp scale min)

if it shuts down then I would wonder if the power supply is working correctly you might also want to measure the voltage across the Black and white wires going into the powerSupply (AC Voltage) are you using 120 or 200+ volts?)

let me know what you find I will take a closer look at the power supply here just to see if I can come up with any other Ideas?
 

[Staston Lombardi]

Voltage between 6 and 7 on pid is  24 V  ( when motor on , heat off ) 

when temp is ok Amps = 0 and it shut down the power supply again , same sound , motor not running ( but PID and Heat are ok ) 

234 V between  power supply  black and white wires 

Thx

[Staston Lombardi]

i succeeded to make motor work , when it's not touching the case , so i guess something is wrong  as there is current in the case , no  ?

[Herb Winters]

good find,

no, the metal part of the power supply is not have any current/voltage on it.
(in my new schematic I have it tied to the Chassis ground.

I am assuming that there is a short somewhere could be in the Power Supply, Motor, or Controller.

motor Check:
if you disconnect the wires of the motor see if you can measure a resistance between each lead and the metal case of the Motor.
it should not have a measurable  resistance or at least be very high resistance value.

Power Supply is harder as it needs to be on to test it.
disconnect both red and black wires on the Power supply from all other connections power up the power supply and see if you can measure a DC voltage from the Red lead to either of the White or black leads (be careful !)
then do the same measurement using the Black DC ground wire and measure the for DCV to the White or Black AC wires.

if you have any questions ask first this is dangerous so better to ask first :)

 

[Staston Lombardi]

I've verified all the wires again , no one  is touching the case except the ground one 

[Staston Lombardi]

finally i got it , it's the motor , the black wire connector on the main motor  was a little bit touching the motor metal , just moved it one millimeter and it's ok 

mounting all again now , 

Thx for your help , I really apreciate your efforts .

Sincerely,

[Herb Winters]

Great find, That was a difficult to find problem at least if it happens again we will know what to look for!

you are welcome.