Rockwell-automation 1747-ACNR15 ControlNet Adapter Module User Manual Manual de usuario descargar pdf (Pagina 104)

Publication 1747-UM003A-EN-P

B-12 Understanding Your SLC 500/1746 Control System

Place the main power disconnect switch where operators and maintenance

personnel have quick and easy access to it. If you mount a disconnect switch

inside the system enclosure, place the switch operating handle on the outside of

the enclosure, so that you can disconnect power without opening the

enclosure.

Whenever any of the emergency-stop switches are opened, power to input and

output devices is stopped.

When you use the master control relay to remove power from the external

I/O circuits, power continues to be provided to the system’s power supply so

that diagnostic indicators on the processor can still be observed.

The master control relay is not a substitute for a disconnect to the controller. It

is intended for any situation where the operator must quickly de-energize I/O

devices only. When inspecting or installing terminal connections, replacing

output fuses, or working on equipment within the enclosure, use the

disconnect to shut off power to the rest of the system.

IMPORTANT

If you are using a dc power supply, interrupt the dc side

rather than the ac side to avoid the additional delay of

power supply turn-on and turn-off. The dc power supply

should receive its power directly from the fused secondary

of the transformer. Connect the power to the dc input and

output circuits through a set of master control relay

contacts.

IMPORTANT

The operator must not control the master control relay

with the processor. Provide the operator with the safety of a

direct connection between an emergency stop switch and

the master control relay.

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Rockwell-automation 1747-ACNR15 ControlNet Adapter Module User Manual Manual de usuario Pagina 104