Power On Failure In Initializing - Universal Robots UR5 Service Manual

Protective stops must never be acknowledged and reset automatically, it must always be a
deliberate action by a user to resume after a protective stop.
In general, protective stops are designed to inform the user that the robot has stopped due to an
external event such as hitting an obstacle or similar. In case the robots are pushed close to the
limits, the robots can generate protective stops to indicate that they are not capable of following
the desired trajectory. After a protective stop, the following must be done before resuming
operation:
i. If there has been a collision or similar:
Remove the obstacle and ensure that operators are out of the way before resuming
operation. See Section 2 of Service Manual (see link below).
ii. If there has been NO collision or similar:
The robot is operating too close to the limits, the application should be adjusted to reduce
the load on the robot, for instance by reducing accelerations, by correct use of blends or
similar measures.
Protective stops are indications of issues, including program or production issues – not only
safety issues. An application which results in daily protective stops is not designed correctly
and needs to be modified.
2. If an automatic acknowledgment and reset of a protective stop has been programmed – no
one will see the protective stop.
WARNING
Automatic acknowledgment and reset of protective stops masks faults that will
lead to a failure condition.
When there is a protective stop, verify the cause.
If there has been no collision, then adjust the program
If an integrator has set-up the application program to do automatic acknowledgement and reset
of protective stops, the customer should contact the integrator change the program immediately,
as such override voids the product warranty and masks fault detection.

7.3.4. 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.
UR5 204
7. Troubleshooting
Service Manual