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24
Safe Torque Off
The Safe Torque Off function disables the control voltage of the power semiconductors of the drive
output stage, thus preventing the inverter from generating the voltage required to rotate the motor.
For Safe Torque Off wiring, see the appropriate hardware manual and
Application guide - Safe
torque off function for ACSM1, ACS850 and ACQ810 drives
(3AFE68929814 [English]).
If there is a Safe Torque Off circuit in use, check that the circuit
functions.
Selects how the drive reacts when the Safe Torque Off function is
active (i.e. when the control voltage of the power semiconductors of
the drive output stage is disabled).
Voltage control
If the DC voltage drops due to input power cut off, the undervoltage controller will automatically
decrease the motor torque in order to keep the voltage above the lower limit.
To prevent the DC voltage from exceeding the overvoltage control limit, the overvoltage controller
automatically decreases the generating torque when the limit is reached.
When the overvoltage controller is limiting the generating torque, quick deceleration of the motor is
not possible. Thus electrical braking (braking chopper and braking resistor) is needed in some
applications to allow the drive to dissipate regenerative energy. The chopper connects the braking
resistor to the intermediate circuit of the drive whenever the DC voltage exceeds the maximum limit.
Check that the overvoltage and undervoltage controllers are active.
If the application requires a braking resistor (the drive has a built-in
braking chopper):
• Set the braking chopper and resistor settings.
Note:
When a braking chopper and resistor are used, the overvoltage
controller must be deactivated by parameter
• Check that the connection functions.
For more information on the braking resistor connection, see the
appropriate hardware manual.
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Содержание ACSM1 Series
Страница 1: ...ABB motion control drives Firmware manual ACSM1 motion control program ...
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Страница 34: ...Drive programming using PC tools 34 ...
Страница 86: ...Drive control and features 86 ...
Страница 265: ...Parameters and firmware blocks 265 1 100 us 100 µs 2 1 ms 1 ms 3 50 ms 50 ms ...
Страница 302: ...Parameter data 302 ...
Страница 422: ...Application program template 422 ...
Страница 430: ...Appendix A Fieldbus control 430 ...
Страница 500: ...Appendix D Application examples 500 ...
Страница 508: ...Appendix E Control chain and drive logic diagrams 508 ...
Страница 510: ...3AFE68848270 REV H EN 2015 06 26 Contact us www abb com drives www abb com drivespartners ...