# IRB2400/16 Joint falling after Deadman release **URL:** \ **Category:** IRC5\ **Tags:** fault, irc5, jogging\ **Created:** [June 19, 2023, 6:30pm UTC](https://tech-community.robotics.abb.com/t/irb2400-16-joint-falling-after-deadman-release/11156 "2023-06-19T18:30:21Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Kappa95](https://avatars.discourse-cdn.com/v4/letter/k/839c29/32.png) [@Kappa95](https://tech-community.robotics.abb.com/u/Kappa95)\ **Post date:** [June 19, 2023, 6:30pm UTC](https://tech-community.robotics.abb.com/t/irb2400-16-joint-falling-after-deadman-release/11156/1 "2023-06-19T18:30:21Z")
Dear community, I have a problem while jogging the robot. The Joint3 of the robot is falling after releasing the Deadman switch of the Flex Pendant (i.e., moving with the middle position of the Deadman an then terminating the jog releasing the switch). It seems that happens only on the joint 3 and only during jogging. No errors appear on the Flex Pendant, the falling motion is in the order of magnitude of 4-5 centimeters. I haven’t changed the payload and the programs or settings by weeks and the robot was off of at most 3 weeks. What it could be? Can I solve/do something? Federico ---
**Author:** ![lemster68](https://dub1.discourse-cdn.com/flex005/user_avatar/tech-community.robotics.abb.com/lemster68/32/1945_2.png) [@lemster68](https://tech-community.robotics.abb.com/u/lemster68)\ **Post date:** [June 19, 2023, 6:50pm UTC](https://tech-community.robotics.abb.com/t/irb2400-16-joint-falling-after-deadman-release/11156/2 "2023-06-19T18:50:17Z")
The brake is slipping. If it is not motors on push that axis to get a feel for what force it takes to overpower the brake. Hopefully, you have another good robot which you can try the same thing to verify that the brake is slipping by the difference it takes to move them. ---
**Author:** ![Kappa95](https://avatars.discourse-cdn.com/v4/letter/k/839c29/32.png) [@Kappa95](https://tech-community.robotics.abb.com/u/Kappa95)\ **Post date:** [June 19, 2023, 6:56pm UTC](https://tech-community.robotics.abb.com/t/irb2400-16-joint-falling-after-deadman-release/11156/3 "2023-06-19T18:56:14Z")
Unfortunately I don’t have another ABB robot to use as comparison. For the push test Can I stay in manual mode or is it better to stay in Automatic with motor off? Also I should expect some error or only the joint moves and then stops? Thank you ---
**Author:** ![lemster68](https://dub1.discourse-cdn.com/flex005/user_avatar/tech-community.robotics.abb.com/lemster68/32/1945_2.png) [@lemster68](https://tech-community.robotics.abb.com/u/lemster68)\ **Post date:** [June 19, 2023, 7:03pm UTC](https://tech-community.robotics.abb.com/t/irb2400-16-joint-falling-after-deadman-release/11156/4 "2023-06-19T19:03:56Z")
Motors off is the same whether it is in teach or auto. You could get an error like joint speed too high, but I would not expect that anything will go majorly wrong as long as the power is on. If you move it with power off you will lose rev counters. For safety’s sake let’s just say you do so in teach. ---
**Author:** ![lemster68](https://dub1.discourse-cdn.com/flex005/user_avatar/tech-community.robotics.abb.com/lemster68/32/1945_2.png) [@lemster68](https://tech-community.robotics.abb.com/u/lemster68)\ **Post date:** [June 19, 2023, 7:05pm UTC](https://tech-community.robotics.abb.com/t/irb2400-16-joint-falling-after-deadman-release/11156/5 "2023-06-19T19:05:20Z")
Also, don’t put yourself in a position in which if it fails completely, it will fall on you. Don’t get underneath the robot. ---
**Author:** ![Kappa95](https://avatars.discourse-cdn.com/v4/letter/k/839c29/32.png) [@Kappa95](https://tech-community.robotics.abb.com/u/Kappa95)\ **Post date:** [June 19, 2023, 7:18pm UTC](https://tech-community.robotics.abb.com/t/irb2400-16-joint-falling-after-deadman-release/11156/6 "2023-06-19T19:18:33Z")
> [@lemster68](#): > > Motors off is the same whether it is in teach or auto. You could get an error like joint speed too high, but I would not expect that anything will go majorly wrong as long as the power is on. If you move it with power off you will lose rev counters. For safety’s sake let’s just say you do so in teach. Perfect! I will do the test tomorrow. Then if it slips I imagine that I should contact ABB for repairing. Thank you ---
**Author:** ![lemster68](https://dub1.discourse-cdn.com/flex005/user_avatar/tech-community.robotics.abb.com/lemster68/32/1945_2.png) [@lemster68](https://tech-community.robotics.abb.com/u/lemster68)\ **Post date:** [June 19, 2023, 7:30pm UTC](https://tech-community.robotics.abb.com/t/irb2400-16-joint-falling-after-deadman-release/11156/7 "2023-06-19T19:30:56Z")
You are welcome. ---
**Author:** ![Kappa95](https://avatars.discourse-cdn.com/v4/letter/k/839c29/32.png) [@Kappa95](https://tech-community.robotics.abb.com/u/Kappa95)\ **Post date:** [June 20, 2023, 11:28am UTC](https://tech-community.robotics.abb.com/t/irb2400-16-joint-falling-after-deadman-release/11156/8 "2023-06-20T11:28:57Z")
I did the test pushing the robot and effectively the robot moves and then stop with minima force. I run also the BrakeCheck routine and it shows the brake problem. Thank you ---
**Author:** ![lemster68](https://dub1.discourse-cdn.com/flex005/user_avatar/tech-community.robotics.abb.com/lemster68/32/1945_2.png) [@lemster68](https://tech-community.robotics.abb.com/u/lemster68)\ **Post date:** [June 20, 2023, 11:56am UTC](https://tech-community.robotics.abb.com/t/irb2400-16-joint-falling-after-deadman-release/11156/9 "2023-06-20T11:56:47Z")
I didn’t even think about the brake check. Good job.