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Note that the S5 is designed for time delay off and S9 is configured as time delay on.
Sequence of Operation
The ViSP all-stop function is described in ViSP All-Stop Function .
Power is feed to the all stop via ABUS-6. The power supply is connected to non-generator backed UPS 120/208V. This power supply is controlled by channel 18 of the Eaton PDU. Feedback status of the power supply is provided to the Beckhoff I/O.
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When an all stop button or the GIC interlock are transitioned to the safe state, all enable signals are immediately switched off. MOD_ROT_STO and outputs of S11 unit 1 (feed back to GIS and spares) also is switched off at this time. After the expiration of the time delay on de-energization of the S5 expires, all other STO signals are switched off.
Issues
Looking at the above description and sequence of operation have led to some questions about the original intent of the ViSP designers. Referencing the ViSP Control System Design Report, there is a lack of sufficient detail to answer some questions regarding the design.
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Finally, I was very surprised that the delay time of both relays are set to the very minimum (40 milliseconds). Even with most axes being small, low mass axes that sounds like very rapid deceleration for some of the larger mechanisms. Although for the one stage I found analyzed (Slit Station Mechanical) it was well within specifications for allowable g-forces. We should verify the deceleration parameters programmed in the drives.
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Current Switch Positions
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As of March 6, 2023:
PNOZ S5
In2-
mode A
t[s] 0
ViSP Drawings
| View file |
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| name | VISP Drawings_All Stop Distribution Box.pdf |
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| View file |
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| name | VISP Drawings_Electronics Rack 2.pdf |
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PILZ Documentation
| View file |
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| name | PNOZ_s5_Operat_Man_21397-EN-13 (1).pdf |
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| View file |
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| name | PNOZ_s7_1_Operat_Man_21865-EN-11.pdf |
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| View file |
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| name | PNOZ_s7_2_Operat_Man_21866-EN-11.pdf |
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| View file |
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| name | PNOZ_s9_Operat_Man_21401-EN-14.pdf |
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| View file |
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| name | PNOZ_s11_Operat_Man_21693-EN-14.pdf |
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Tim’s Notes
| View file |
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| name | VISP ALL STOP TIMING.pdf |
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