All rights reserved        10             Installation Guide (en) 1.3.3 
6.2 Protective Stop 
“C153 
Protective 
Stop” in Log 
File? 
 
YES 
NO 
1. Check installation settings and make 
sure the following settings are configured 
correctly: 
 
- Payload 
- Tool Center Point 
- Center of Gravity  
- Mounting 
- Accelerations 
 
2. Verify that the robot does not push 
excessively in pick-up place positions, 
thereby creating unwanted forces that 
can cause protective stops. Re-teach 
relevant waypoints for higher precision. 
 
3. Is Smooth Transition set to “Hard” and 
the accelerations and/or speed is high, 
its recommended to use “Soft” options 
when possible. 
 
UR Support Site 
Article “Preventive 
actions for error code 
“C153 Protective 
Stop: joint positions 
deviates from path”“ 
Unnecessary URCaps software delay the 
program start and require additional 
performance.  
 
If many URCaps have been installed and 
uninstalled again, generating new image 
using Win32DiskImager (free-ware SW tool) 
and downloaded Robot Image Software from 
UR Support Site is a good practice.  
 
It is important to backup programs and 
calibration data and transfer to new image. 
 
UR Service Manual 
Chapter “Backup of 
data” 
 
UR Support Site 
Article “How to 
replace flashcard in 
CB3 robots” 
Please note that communication with 
dashboard server or external devices is not 
opened and closed unnecessarily often. This 
is CPU intensive operation and may delay 
the program execution.