Universal Robots ur3 Service Manual

If the 48V LED indicator is off all the time in the startup sequence you should measure the
voltage: See the E-Plan diagram: 5.4.1 Schematic overview
1. Measure the 48V on the Safety Control Board (SCB) where the 48V comes from the Current
distributor. And check this 1 second pulse.
a. The voltage is measured on the Safety Control Board. That means the Safety Control
Board is defect.
b. No voltage is measured on the Safety Control Board. Then measure the 230 V on the
input side of the 48V power supply. If the voltage pulse of 1 second is present, the
Power supply is defect.
c. No voltage is measured on the input of the power supply. Then measure the 230 V on
the input side of the Current distributor. If the voltage is present, the current
distributor is defect.
7.4. Error phenomena
7.4.1. Control Box: NO CONTROLLER displayed in Initializing
UR3 200 Service Manual
7.Troubleshooting
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Universal Robots ur3 Specifications

General

Brand	Universal Robots
Model	ur3
Category	Robotics
Language	English