Universal Robots UR5 Service Manual page 106

C25A Motor Encoder index
missing
C26A Motor Encoder index
drift detected
C27A Calibration data is
invalid or does not
exist.
C29A Online Calibration
data checksum
failed
C30A Master received
data from too many
joints
C31A Caught wrong
message (not from
master)
C32A Flash write verify
failed
C33A Calibration flash
checksum failed
C34A Program flash
checksum failed
C34A0 Program flash
checksum failed
during bootloading
C34A1 Program flash
checksum failed at
runtime
C35A Joint ID is undefined
UR5
Joint's encoder system
mechanical problem
Joint's encoder system
mechanical problem
Calibration needed
Serial communication
problem with joint
100
7. Troubleshooting
a) Do a Complete rebooting
sequence.
b) If this happens more than
two times in a row, replace
joint
c) Contact your local UR
provider
a) Do a Complete rebooting
sequence.
b) If this happens more than
two times in a row, replace
joint
c) Contact your local UR
provider
a) Do a Complete rebooting
sequence.
b) If this happens more than
two times in a row, replace
joint
a) Do a Complete rebooting
sequence.
b) If this happens more than
two times in a row, replace
joint
Check black 2-wire
connectors and wires on
joints
Update Firmware
Update Firmware
Update Firmware
Service Manual