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Rockwell Automation Publication IASIMP-QS005H-EN-P - April 2016
Chapter 1
Risk Assessment and System Design
Panel Assembly Feed Conveyor (B)
Analysis of the Panel Assembly Feed Conveyor (B) yields the following information.
Part weight:
12 lbs
Indexing frequency:
8…12 parts per minute
Drive:
3 HP PowerFlex® 70 Variable Frequency Drive, 460V, 3-phase
Two mechanical brakes:
power to release, spring to hold (fail to safe)
Top speed: 12 in./s (30 cm/s)
Tested stop time: 0.3 s
Index time: 2…3 s
Pneumatic clamp actuator:
pneumatic cylinder, 80 psi (5.6 kg/cm) required
Top speed: 32 in./s (81 cm/s)
Tested stop time: 0.35 s
Task:
The operator realigns parts in the part locators at Positioning Station #1 and Positioning Station #2 of the Panel
Assembly Feed Conveyor. Maintenance personnel adjust tool positioning at both stations and lubricate and repair
equipment as needed.
The Panel Assembly Feed Conveyor has sensors to indicate when a part is in position at Positioning Station #1 for rough
alignment and at Positioning Station #2 for final alignment and part holding for assembly. A stack light annunciates
proper part positioning with a green light and improper loading with a red light.
The Panel Assembly Feed Conveyor is loaded automatically upstream of this station.
Table 5 - Proposed Architecture for Panel Assembly Feed Conveyor
Components
Standard Inputs
Safety Inputs
Safety Outputs
Comments
Drive enable
1
The standard input is the output of the control system into
the safety logic to initiate the drive motion.
Safety enable 1
1
Enable to the PowerFlex 70 Drive
Safety enable 2
1
Enable to the PowerFlex 70 Drive
Feedback 1
1
Drive Safety System Feed Back #1
Feedback 2
1
(Feedback can be wired in series)
Pneumatic safety valve #1
1
…
Pneumatic safety valve #2
1
…
Pneumatic safety valve feedback
1
…
Total:
1
2 or 3
4