Universal Robots UR5 Service Manual page 121

7. Troubleshooting
C50A53 58V generator
deviation error
C50A54 5V regulator too low
C50A55 5V regulator too high
C50A56 -4V generator too low
C50A57 -4V generator too high
C50A80 Last CPU reset
caused by Low-
Power-Reset
C50A81 Last CPU reset
caused by Window-
Watchdog-Reset
C50A82 Last CPU reset
caused by
Independent-
Watchdog-Reset
C50A83 Last CPU reset
caused by Software-
Reset
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
C51 CRC check failure on
secondary bus
User Manual
The Safety Control Board
was reset on explicit
request.
Robot Problem: Robot Cable
is not detected
Robot Problem: 48V power
supply or wrong robot type
Robot Problem: 48V power
supply
Robot Problem: 48V power
supply
115
Check cable and
connections between robot
and control box
Check robot type. Look for
short circuit in cable and in
robot arm.
UR5