June 17, 2019, 05:00:59 AM
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 Adjusting torque on motor Brakes?

normal_post Author Topic:  Adjusting torque on motor Brakes?  (Read 327 times)

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April 16, 2019, 01:43:29 PM
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SureFab


Hello all, i am having an issue with the brakes not holding while the positioner is tilting. is their a way I can modify the max torque of the brakes holding?? i believe i have found the menu on the teach pendant but it says i am unable to modify due to write protection.. is their a way around that??

s4c+
MTB2000 Motor

thanks in advance

,Beau

Today at 05:00:59 AM
Reply #1

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April 16, 2019, 01:55:12 PM
Reply #1
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fluke


Not possible. Brakes as mechanical equipments and does not have any parameter. It working only On or Off. Parameter only show maximum brake torque of motor.

« Last Edit: April 16, 2019, 01:58:08 PM by fluke »

April 16, 2019, 02:23:55 PM
Reply #2
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SureFab


This is the error i get.

Error: 50055
Joint load too high
Actual torque on joint ROT8 too high.
Might be cause by incorrect load data.
too high acceleration, high external
process forces. low temperature or
hardware error.
-check load data.
-reduce acceleration or speed.
-Check operation of brake contactor
and brakes.
-Check other hardware

April 16, 2019, 03:24:17 PM
Reply #3
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SAABoholic


The two issues are different while related...

If the brake is not holding it could be because it's worn out, or that the load is high, plus a bunch of other things....

Joint Load too high is either just that, or the brake might not disengage properly, plus a bunch of other things....


So the obvious question - what is your load and how far off the center axis of the positioner is your center of gravity ?

When the brake is unable to hold it, does it slip just a short distance ?  Do you get any other errors (joint speed mainly) ?


April 16, 2019, 04:09:23 PM
Reply #4
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SureFab


well? we just built this postioner and this is the first time we are trying it. before the postioner could only spin as if it were clock hands hanging on a wall. robot is also on a 30ft track (roughly 9m) on the otherside of the track we had a ferris wheel type positioner designed for welding booms of the sort. i basically combined the 2 postioners together and am trying to make it work as one. so now i have one postioner that can both tilt and spin... the platter itself weighs around 900lbs (409kg) and the weldment at the moment weighs about 1000lbs (456kg). the weldment measures about 96inches (244cm) long. but the center of gravity is only about 22inches (56cm) from the platter.. currently i do not have a counterweight on the bottom side of this positioner so there is probably alot of strain on that motor.. when the table is tilted at a 45 degree that is when it starts slowly dropping down, we are able to get the table back upright by simply using a small amount of man power to help assist strain on the motor.. what do you think the best option would be? do you think a counter weight would help?? also this motor is rated for 2000kg. im about half of that weight right now so it should not be a problem

April 16, 2019, 04:38:06 PM
Reply #5
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fluke


How do you do decide motor is rated 2000 Kg ? Where ?

Review attached file.



« Last Edit: April 16, 2019, 04:46:51 PM by fluke »

April 16, 2019, 05:37:19 PM
Reply #6
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SureFab


there is a tag on the motor that gives you a model number and id. if you search that model number online it will give you the specs for it.


do you think a counterweight would work?
« Last Edit: April 16, 2019, 05:47:41 PM by SureFab »

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April 16, 2019, 05:54:34 PM
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fluke


 :icon_smile: I know how can I found technical specs. Thank you. I mean how do "you" do decide ? Where to load 2000 kg ? In rotation center or far to 1000 mm ? Document is explain that.

April 16, 2019, 07:09:52 PM
Reply #8
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SureFab


ooohhh gotcha. i guess i had misread that. well?? trial and error at the moment i suppose. i know its not the technical way of doing it.... i kinda figured i would run into this problem though.. im going to try a counter weight and see if that fixes my problem. i have a really good feeling that it will help greatly though..

April 16, 2019, 08:07:27 PM
Reply #9
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fluke


Your modified positioner is heavy and you want to make more heavy with counter balance. It will not solve.
« Last Edit: April 17, 2019, 05:12:04 AM by fluke »

April 17, 2019, 08:09:51 PM
Reply #10
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SureFab


counter weights fixed the problem! thanks guys

April 18, 2019, 03:14:23 AM
Reply #11
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Skooter


Seen this error a few times where 2 fixtures are used and when one is removed, it's out of balance.  Also had it when a much heavier fixture was on one side.  Simply added some weight to the lighter side to achieve better balance.  It's best to have the CG as close to the center of rotation as possible.


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