Use - ABB ACS880-37 Hardware Manual

Action
Test the operation of the failure detection of the inverter. The motor can be stopped or running.
• Open the 1st channel of the STO circuit (wire coming to IN1). If the motor was running, it should
coast to a stop. The inverter generates a FA81 Safe Torque Off 1 loss fault indication (see the
firmware manual).
• Give a start command to verify that the STO function blocks the inverter's operation. The motor
should not start.
• Close the STO circuit.
• Reset any active faults. Restart the inverter and check that the motor runs normally.
• Open the 2nd channel of the STO circuit (wire coming to IN2). If the motor was running, it should
coast to a stop. The inverter generates a FA82 Safe Torque Off 2 loss fault indication (see the
firmware manual).
• Give a start command to verify that the STO function blocks the inverter's operation. The motor
should not start.
• Close the STO circuit.
• Reset any active faults. Restart the inverter and check that the motor runs normally.
Document and sign the acceptance test report which verifies that the safety function is safe and
accepted for operation.

Use

1. Open the activation switch, or activate the safety functionality that is wired to the STO
connection.
2. STO inputs on the inverter control unit de-energize, and the inverter control unit cuts
off the control voltage from the inverter IGBTs.
3. The control program generates an indication as defined by parameter 31.22 (refer to
the firmware manual of the inverter).
4. The motor coasts to a stop (if running). The drive will not restart while the activation
switch or safety relay contacts are open.
5. Deactivate the STO by closing the activation switch, or reseting the safety functionality
that is wired to the STO connection.
6. Reset any faults before restarting.
WARNING! The Safe torque off function does not disconnect the voltage of the
main and auxiliary circuits from the drive. Therefore maintenance work on
electrical parts of the drive or the motor can only be carried out after isolating the
drive from the main supply.
WARNING! The Safe torque off functionality is only achieved through the XSTO
connector of the inverter control unit (A41). True Safe torque off functionality is not
achieved through the XSTO connectors of other control units (such as the supply
control unit or the brake control unit).
The Safe torque off function is supported by any ACS880 inverter unit firmware. It is not
supported by supply or brake firmware.
WARNING! (With permanent magnet or synchronous reluctance [SynRM] motors
only) In case of a multiple IGBT power semiconductor failure, the inverter system
can produce an alignment torque which maximally rotates the motor shaft by
180/p (with permanent magnet motors) or 180/2p (with synchronous reluctance [SynRM]
motors) degrees regardless of the activation of the Safe torque off function. p denotes the
The Safe torque off function 245