Rockwell-automation 1560E SMC Flex Smart Motor Controller Manual de usuario descargar pdf (Pagina 177)

Appendix C

1560E and 1562E Relay Control

Functional Description The following functional descriptions and associated control circuits are

for units using electromechanical (relay) control.

Bulletin 1562E • Basic Control – Controlled Start only

When wired as shown in Figure C.1, the controller operates as follows:

Pressing the "Start" button initiates the start sequence. Relay "CR" closes

and applies control power to terminal 17 of the SMC-Flex module. The

auxiliary contact #2 (set for "normal") closes, picking up "MC", which

completes the hold-in circuit on the start button, and closes the main

contactor.

The SMC-Flex module examines the line voltage, looks for fault

conditions, checks phase rotation, calculates zero crossing information,

and begins gating the SCRs to start the motor.

When the motor approaches rated speed, the SMC-Flex module closes the

"AUX1" (up-to-speed) auxiliary contacts, closing relay "BC", which closes

the bypass contactor. The motor then runs at full line voltage.

When the "Stop" button is pressed, the "CR" relay opens terminal 17 on

the SMC-Flex module. The "AUX2" (Normal) contact opens, dropping

out the main contactor, allowing the motor to stop. The "AUX1" contact

also opens, but "BC" is held closed for a short time by the control module.

This holds the bypass contactor closed for about 10 seconds to protect the

power electronics from any voltage transients due to opening the motor

circuits.

1560E-UM050B-EN-P - June 2013

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Rockwell-automation 1560E SMC Flex Smart Motor Controller Manual de usuario Pagina 177