Universal Robots UR5 Service Manual page 118

C44A80 CRC Check failure on
primary bus
C45 AD-Converter error
C46 Loose gearbox or bad
encoder mounting
C47 AD-Converter hit low
limit
C48 Powerbus voltage
drop detected.
C49 RS485 receive
warning
C49A200 Secondary RS485 bus
is down
C50 Robot powerup failure Electrical error control box
C50A1 Voltage detected at
24V rail before
startup
C50A2 Voltage present at
unpowered robot
UR5
Most likely an interference
on the communication bus
Mechanical problem in gear
related to encoder mounting
EMC issue external or
electronics internal
Error on 48V powerbus to
robot arm
Bus for: Teach Pendant,
Processor A and Processor B
on the Safety Control Board.
112
7. Troubleshooting
a) Check black 2-wire
connectors and wires in
joints
b) Do a Complete rebooting
sequence as per section
5.3.7
c) If this happens more
than two times in a row,
contact your local service
provider for assistance.
a) Do a Complete rebooting
sequence as per section
5.3.7
b) If this happens more
than two times in a row,
replace joint
Check grounding and
shielding for EMC
problems.
Check 48V output from
Power supply. Check
current-distributor PCB.
Replacement of 48V Power
supply or current-
distributor is necessary
Check TCP/IP-12V cable to
Teach Pendant
Remove all external
connections to I/O-
interface on the Safety
Control Board. Check for
short circuit.
User Manual