Universal Robots UR3 Service Manual page 111

7. Troubleshooting
C50A84 Last CPU reset
caused by External-
Pin-Reset
C50A85 Last CPU reset
caused by Brown-
Out-Reset
C50A99 Wrong software on
PCB
C50A100 Cable not connected
C50A101 Short circuit in robot
detected or wrong
robot connected to
control box
C50A102 Voltage rising too
slowly
C50A103 Voltage failed to
reach acceptable
level
C50A104 The IMMI module
does not respond
C51A CRC check failure on
secondary bus
C51A0 Processor B
C51A1 Primary screen
processor
C51A2 Secondary screen
processor
C51A3 Primary E67
C51A4 Secondary E67
C53A IO overcurrent
detected
C53A1 IO Overcurrent
detected. Max is
800mA
Service Manual
CRC check failure on safety
processor 1 in Teach
Pendant
CRC check failure on safety
processor 2 in Teach
Pendant
Control Board error
105
Check cable and connections
between robot and control
box
Check robot type. Look for
short circuit in cable and in
robot arm
Remove all external
connections to I/O-interface
of Safety Control Board.
Check for short circuit
UR3