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3
20. EMC AND LOW VOLTAGE DIRECTIVES
20.1.2 Installation inside the control panel
The PLC is open equipment and must be installed within a control panel for use.* This is
effective not only for ensuring safety but also for shielding electromagnetic noise
generated from the PLC.
*
Each network remote station also needs to be installed inside the control panel.
However, waterproof type remote stations can be installed outside the control panel.
(2) Control panel
(a) Use a conductive control panel.
(b) When fixing the top or base plate with bolts, mask the fixing area when painting
so that an electrical contact can be made.
(c) To ensure an electrical contact with the control panel, mask the bolt areas of the
inner plates when painting to allow conductivity over the widest possible area.
(d) Ground the control panel with a thick wire so that a low impedance can be
ensured even at high frequencies.
(e) Holes made in the control panel must be 10cm (3.94inch) diameter or less. If the
diameter is more than 10cm (3.94inch), radio waves can be leaked.
(3) Connection of power cable and ground wires
Handle the power cables and ground wires as described below.
(a) Provide a grounding point near the power supply module. Ground the power
supply module's LG and FG terminals (LG : Line Ground, FG : Frame Ground)
with the thickest and shortest wire possible. (The wire length must be 30cm
(11.18inch) or shorter.)As the LG and FG terminals release the noise generated
in the PLC to the ground, the lowest possible impedance must be ensured.
The ground wires also need to be short as they are used to release noise.
Because the wire itself carries large noise, short wiring prevents it from acting as
an antenna.
(b) Twist the ground wire led from the grounding point with the power cable. By
doing this, noise from the power cable can be released to the ground. If a filter is
attached to the power cable, however, this twisting may not be needed.
Содержание Q2ACPU
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Страница 221: ...12 12 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU ...
Страница 222: ...12 13 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU ...
Страница 237: ...12 28 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU MEMO ...
Страница 269: ...16 11 16 POWER SUPPLY MODULE 2 Names and description of parts of the A62P A62PEU and A65P module ...
Страница 271: ...16 13 16 POWER SUPPLY MODULE 4 Names and description of parts of the A66P ...
Страница 343: ...21 21 13 MAINTENANCE AND INSPECTION 21 4 2 Replacement of the fuse for an output module ...
Страница 357: ...22 12 22 TROUBLESHOOTING ...
Страница 359: ...22 14 22 TROUBLESHOOTING MEMO ...
Страница 417: ...App 20 APPENDICES 3 Shift instructions Classification Symbol Description n bit shift 1 bit shift 1 word shift ...
Страница 429: ...App 32 APPENDICES Trigonometric function Classification Symbol Description ...
Страница 432: ...App 35 APPENDICES 15 Clock instructions Classification Symbol Description Clock data read write ...
Страница 537: ...App 140 APPENDICES REMARK 1 Message 1 An error code is displayed in 2 Alert 1 3 Alert 2 ...
Страница 538: ...App 141 APPENDICES APPENDIX 6 EXTERNAL DIMENSIONS Appendix 6 1 CPU Module 1 Q3ACPU Q4ACPU modules Unit mm inch ...
Страница 539: ...App 142 APPENDICES 2 Q2ACPU Q2ACPU S1 modules Unit mm inch ...
Страница 541: ...App 144 APPENDICES 2 A66P power supply module Unit mm inch ...
Страница 542: ...App 145 APPENDICES Appendix 6 3 Main Base Unit 1 A32B base unit 2 A32B S1 base unit Unit mm inch Unit mm inch ...
Страница 543: ...App 146 APPENDICES 3 A35B base unit 4 A38B A38HB A38HBEU base unit Unit mm inch Unit mm inch ...
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