ALLEN BRADLEY 1747-L551 PLC Processor

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System Installation Recommendations 3–9 ! ATTENTION: Your SLC 500 power supply can be damaged by voltage surges when switching inductive loads such as motors, motor starters, solenoids, and relays. To avoid damage to your SLC 500 power supply in these applications, it is strongly recommended that an isolation transformer be used to isolate the power supply from harmful voltage surges. Grounded ac Power-Distribution System with Master-Control Relay ➀ Incoming AC L1 L2 L3 Disc. 1FU Suppressor L1 ➁ 2FU L2 To Motor Starters 3FU L3 H 1 H 4 ➃ H 3 H 2 Back-panel ➂ Step-down Transformer Ground Bus Enclosure Wall FUSE Multiple E-stop switches X 1 X 2 Start Grounded Conductor CRM Equipment- Grounding Conductors Grounding-electrode Conductor to Grounding-electrode System CRM Suppressor 1 The I/O circuits form a net inductive load switched by the CRM contacts. Therefore, a suppressor is needed across the line at the load side of the CRM contacts. CRM Input Sensor L1 Input Module Wiring Arm Controller Power Supply ➄ Suppressor Output Module Wiring Arm GND N or L2 Output Actuator CRM User DC Supply To DC I/O actuators/ sensors Connect when applicable ➀ To minimize EMI generation, connect a suppressor across an inductive load. For more information on selecting surge suppressors, see page 2–24. ➁ Contact motor manufacturer for recommended surge supression for motors. ➂ In applications where severe energy is re-generated by motors when power is removed, use an isolation/constant-voltage transformer in place of the step-down transformer. ➃ In many applications, a second transformer provides power to the input circuits and power supplies for isolation from the output circuits. ➄ Connect a suppressor here to minimize EMI generation from the net inductive load switched by the CRM contacts. suppressors, see page 2–24. For more information on selecting surge Publication <strong>1747</strong>-6.2
3–10 System Installation Recommendations Loss of Power Source The chassis power supplies are designed to withstand brief power losses without affecting the operation of the system. The time the system is operational during power loss is called “program scan hold-up time after loss of power.” The duration of the power supply hold-up time depends on the number, type and state of the I/O modules, but is typically between 20 ms and 3 seconds. When the duration of power loss reaches a limit, the power supply signals the processor that it can no longer provide adequate DC power to the system. This is referred to as a power supply shutdown. The power supply LED is turned off. In multi-chassis systems, power outages of 20 to 300 ms in duration can cause a remote power fail error to occur. You can clear this error by cycling power to your system or by using a programming device. Input States on Power Down The power supply hold-up time as described above is generally longer than the turn-on and turn-off times of the input modules. Because of this, the input state change from On to Off that occurs when power is removed may be recorded by the processor before the power supply shuts down the system. Understanding this concept is important. The user program should be written to take this effect into account. For example, hard wire power to one spare input. In the user program, check to be sure that one input is on; otherwise, jump to the end of the program and avoid scanning the logic. Use of a common power source as recommended in the previous section is assumed. Other Types of Line Conditions Occasionally the power source to the system can be temporarily interrupted. It is also possible that the voltage level may drop substantially below the normal line voltage range for a period of time. Both of these conditions are considered to be a loss of power for the system. Publication <strong>1747</strong>-6.2
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Allen-Bradley SLC 500 Modular Hardw
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The information below summarizes th
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iv Table of Contents DH-485 Interfa
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vi Table of Contents Recommendation
Page 9 and 10: viii Table of Contents Connecting t
Page 11 and 12: x Table of Contents Calculating Hea
Page 13 and 14: P-2 Preface How to Use this Manual
Page 15 and 16: P-4 Preface Conventions Used in thi
Page 17 and 18: 1-2 Quick Start for Experienced Use
Page 25 and 26: 2-2 Selecting Your Hardware Compone
Page 33 and 34: 2-10 Selecting Your Hardware Compon
Page 53 and 54: 3-2 System Installation Recommendat
Page 59: 3-8 System Installation Recommendat
Page 63 and 64: 3-12 System Installation Recommenda
Page 65 and 66: 4-2 Mounting Your SLC 500 Control S
Page 71 and 72: 5-2 Identifying the Components of Y
Page 79 and 80: 5-10 Identifying the Components of
Page 87 and 88: 6-2 Installing Your Hardware Compon
Page 95 and 96: 6-10 Installing Your Hardware Compo
Page 97 and 98: 7-2 Wiring Your I/O Modules Contact
Page 99 and 100: 7-4 Wiring Your I/O Modules Prepari
Page 101 and 102: 7-6 Wiring Your I/O Modules Feature
Page 103 and 104: 7-8 Wiring Your I/O Modules Octal L
Page 105 and 106: 7-10 Wiring Your I/O Modules Using
Page 107 and 108: This chapter describes how to start
Page 109 and 110: Starting Up Your Control System 8-3
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Starting Up Your Control System 8-5
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This chapter covers the following m
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Maintaining Your Control System 9-3
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In this chapter, you will learn abo
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Troubleshooting 10-3 Replacing Fuse
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Troubleshooting 10-5 If the LEDs in
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Troubleshooting 10-7 If the LEDs in
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Troubleshooting 10-9 Identifying SL
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Troubleshooting 10-11 Troubleshooti
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Troubleshooting 10-13 If the LEDs i
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Troubleshooting 10-17 Identifying S
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Troubleshooting 10-19 If the RS232
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Troubleshooting 10-21 Identifying P
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Troubleshooting 10-25 Returning the
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11-2 Replacement Parts Catalog Numb
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The information in this appendix wi
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Setting Up the DH-485 Network A-3 O
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Setting Up the DH-485 Network A-5 E
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Setting Up the DH-485 Network A-7 I
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Setting Up the DH-485 Network A-9 T
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Setting Up the DH-485 Network A-11
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This appendix provides an overview
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RS-232 Communication Interface B-3
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This appendix provides an overview
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Setting Up the DH+ Network C-3 Wiri
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This appendix provides a brief intr
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Control Networks D-3 DeviceNet Netw
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- Use this Table to Calculate the
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Power Supply Worksheet E-3 Hardware
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This appendix will assist you in ca
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Calculating Heat Dissipation for th
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This appendix: • describes SLC 5/
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Communicating with Devices on an Et
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You can find the following terms us
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Glossary GL-3 Initiator — A node
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Glossary GL-5 Signal Delay — For
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I-2 Index hardware features, 5-2, 6
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I-4 Index DH-485 Communication Inte
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I-6 Index keyswitch positions for t
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I-8 Index Publication 1747-6.2 Q Qu
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I-10 Index T testing inputs, 8-5 ou
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ALLEN BRADLEY 1747-L551 PLC Processor

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