FFXI Haven - Ваш Источник #1.

Green indicates in operation safely, red indicates problems.
* Construct cabinets to avoid contamination from materials such as oils.
* Conduits should be sealed with removable compounds if they lead to spaces at different temperatures and humidity levels.
* Position terminal strips and other components above 18" for ergonomic reasons.
* Cabinets should be protected with suitably rated fuses.
* Finger sized objects should not be able to reach any live voltages in a finished cabinet, however DMM probes should be able to measure voltages.

plc electrical -31.20

1. REFERENCES
1. SUMMARY
* Electrical schematics used to layout and wire controls cabinets.
* JIC wiring symbols can be used to describe electrical components.
* Grounding and shielding can keep a system safe and running reliably.
* Failsafe designs ensure that a controller will cause minimal damage in the event of a failure.
* PLC enclosure are selected to protect a PLC from its environment.

31.7 PRACTICE PROBLEMS

1. What steps are required to replace a defective PLC?

31.8 PRACTICE PROBLEM SOLUTIONS

1. in a rack the defective card is removed and replaced. If the card has wiring terminals these are removed first, and connected to the replacement card.

31.9 ASSIGNMENT PROBLEMS

1. Where is the best location for a PLC enclosure?
2.

BACK | NEXT

Easy Access To All Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106