Universal Robots 2014350001, Service Manual, Page: 109 / 238

C44A2 Elbow
C44A3 Wrist 1
C44A4 Wrist 2
C44A5 Wrist 3
C44A6 Tool
C44A80 CRC Check failure
on primary bus. Interference on the
communication field bus.
C45A AD-Converter error
C46A Loose gearbox or
bad encoder
mounting Mechanical problem in gear
related to encoder mounting a) Do a Complete rebooting
sequence
b) If this happens more than
two times in a row, replace
joint
C47A AD-Converter hit low
limit EMC issue external or
electronics internal Check grounding and
shielding for EMC problems
C49A RS485 receive
warning
C49A200 Secondary RS485
bus is down Bus for: Teach Pendant,
Processor A and Processor
B on Control Board Check TCP/IP-12V cable to
Teach Pendant
C50A Robot powerup issue Electrical error control box Remove all external
connections to I/O-interface
of Safety Control Board.
Check for short circuit
C50A1 Voltage detected at
24V rail before
startup
C50A2 Voltage present at
unpowered robot
C50A5 Powersupply voltage
too low Check 48 V cable between
power supply and Control
Board
C50A6 Powersupply voltage
too high
C50A11 Voltage not detected
at 24V rail after
startup
C50A15 Warning, waiting for
SafetySYS2
Service Manual 103 UR5
7. Troubleshooting
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