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10. Safety system
MiR1000 Shelf Lift User Guide (en) 12/2020 - v.2.1 ©Copyright 2019-2020: Mobile Industrial Robots A/S.
104
Lift controller errors
The lift controller can detect certain errors with the lift and uses the GPIO interface to
forward the error to the robot computer so it is displayed in the robot interface. The lift
controller will detect an error if:
•
The payload is unevenly distributed.
•
The payload is exceeded.
•
The lift controller is overheated.
•
The actuators are not correctly synched or calibrated and need to be reset.
The lift controller also uses the GPIO interface to signal the lift's current position. If the
position from the lift controller does not match the status from the lift switches, the robot
reports a Limit switch error and cannot use the lift until the lift is reset and the switches are
in agreement with the controller.
A Limit switch error will also occur if the lift cover is not correctly positioned.
10.7 Safety stop
There are two pairs of contactors used to stop MiR1000 Shelf Lift: the STO (Safe Torque Off)
contactors and the dynamic brake contactors. These are controlled by the safety PLC and are
used when the robot goes into Protective or Emergency stop. The following processes occur
to stop the robot safely:
1.
The safety PLC first turns off the STO contactors so power is cut from the motors.
To ensure that the STO contactors switch states as expected, there is a
feedback circuit that connects to the safety PLC to verify that the
contactors switch to the correct state. When the robot is starting up, the
feedback circuit and STO contactors are checked before allowing the robot
to be operated.
2.
The safety PLC turns off the dynamic brake contactors to bring the robot to a stop.
3.
The safety PLC monitors data from the motor encoders to determine whether the robot
has stopped within the expected amount of time.
Содержание 1000 Shelf Lift
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