Power On Failure In Initializing - Universal Robots ur3 Original Instructions Manual

5.3.4 Power on failure in Initializing

If power turns off a few seconds after Robot Power is turned On in the Initializing window, there are many
possible causes for this phenomenon.
Most likely it is a control box failure or a communication failure with a joint or the tool.
Control box failure
Check log history for error messages and consult
the section Error Codes for detailed explanation
Power controller OFF/ON
During power up (within the first three seconds of
power up) measure that 230V AC is present on
48V_PSU1 connector on current distributor PCB
Measure that 12V DC is present in the red
connector/flatcable on the current distributor
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NO
NO
YES
YES
91 Servicemanual_UR3_en_rev3.1.2
Replace 48V power supply
Replace current distributor
Replace Safety Control
Board