TOSVERT VF-S11 Braking Setting Functions

Overview

This document provides technical information on the principal functions and applications of the TOSVERT VF-S11 inverter, specifically focusing on its braking setting functions.

Copyright: Toshiba Schneider Inverter Corporation 2006. All rights reserved.

Braking Setting Functions

The following parameters control the braking timing:

• F342: Braking mode selection
• F343: Release frequency
• F344: Release time
• F345: Creeping frequency
• F346: Creeping time

Parameter Setting for Braking Setting Function

Parameter Setting of Contact Output Signal for Braking (e.g., To use RY-RC output)

Note: For other output terminals, the parameter title may differ. RY-RC: F131, FLA-FLB-FLC: F132.

Explanation of Braking Setting Function

At starting the motor:

When the operation signal is 'ON', the brake release signal becomes 'ON' after achieving the flux of magnetic induction before brake releasing. The inverter generates output torque before the brake is released by outputting the frequency set in F343 to the direction set in F342. The motor can accelerate smoothly simultaneously with brake release because the F344 function provides a delay for the start of acceleration.

At stopping the motor:

When the operation signal is 'OFF', the brake close signal becomes 'ON' after reaching the creeping frequency set in F345. Subsequently, the VF-S11 outputs the creeping frequency for the duration set in F346, and then stops after the delayed time of the mechanical brake.

Detailed Parameter Explanations

F342: Braking mode selection

• 0: Disabled
• 1: Enabled (forward run): The rise operation is a forward rotation of the motor during RISE/DESCENT action. The direction of inverter output frequency (F343) is forward, regardless of the FORWARD/REVERSE drive setting.
• 2: Enabled (reverse run): The rise operation is a reverse rotation of the motor during RISE/DESCENT action. The direction of inverter output frequency (F343) is reverse, regardless of the FORWARD/REVERSE drive setting.
• 3: Enabled (operating direction): This setting is for horizontal operation. The direction of inverter output frequency (F343) matches the direction of drive.

F343: Release frequency

The inverter outputs the frequency set in F343 to the direction set in F342. This function generates motor torque by slipping the restrained motor, allowing the motor to start smoothly when the brake is released. The F343 setting value depends on the load condition; the standard setting is the slipping frequency at the rated output of the applied motor.

F344: Release time

The release time is the duration for which the frequency set in F344 is maintained at the start. The standard setting is the delayed time of the mechanical brake.

F345: Creeping frequency

The 'close brake signal' outputs the frequency set in F345 while the time set in F345 is active during stop. The F345 setting value depends on the load condition; the standard setting is the slipping frequency at the rated output of the applied motor.

F346: Creeping time

The creeping time is the duration for which the frequency set in F345 is maintained. The standard setting is slightly longer than the delayed time of the mechanical brake.

Timing Chart of Brake Setting Function

The following describes the timing of the brake setting functions:

• Operation Signal: Controls the overall operation.
• Output for brake (Between terminals RY-RC): Indicates the brake status (ON/OFF).
• Brake: Shows the state of the brake.
• Output frequency: Displays the output frequency of the inverter, referencing F343 (Release frequency) and F345 (Creeping frequency).
• Exciting current: Shows the preliminary excitation current and regular exciting current.
• Torque current of brake: Illustrates the torque generated by the brake.

The chart illustrates key events such as 'Preliminary excitation', 'Start of drive', 'Stop instruction', and 'Stop', along with the transition where inverter torque begins to be used instead of brake torque.