Safe Torque off function 205
Use
1. Open the activation switch, or activate the safety functionality that is wired to the
STO connection.
2. STO inputs on the drive control unit de-energize, and the drive 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 drive).
4. Motor coasts to 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 system from the main supply.
WARNING!
(With permanent magnet or synchronous reluctance [SynRM]
motors only) In case of a multiple IGBT power semiconductor failure, the drive
system can produce an alignment torque which maximally rotates the motor shaft by
180/
p
(with permanent magnet motors) or 180/2
p
(with synchronous reluctance
[SynRM] motors) degrees regardless of the activation of the Safe torque off function.
p
denotes the number of pole pairs.
Notes:
• If a running drive is stopped by using the Safe torque off function, the drive will cut
off the motor supply voltage and the motor will coast to a stop. If this causes
danger or is not otherwise acceptable, stop the drive and machinery using the
appropriate stop mode before activating the Safe torque off function.
• The Safe torque off function overrides all other functions of the drive.
• The Safe torque off function is ineffective against deliberate sabotage or misuse.
• The Safe torque off function has been designed to reduce the recognized
hazardous conditions. In spite of this, it is not always possible to eliminate all
potential hazards. The assembler of the machine must inform the final user about
the residual risks.
ACS880-01 HW.book Page 205 Monday, July 1, 2013 4:51 PM
Summary of Contents for ACS880-01 Series
Page 4: ...ACS880 01 HW book Page 4 Monday July 1 2013 4 51 PM...
Page 12: ...12 ACS880 01 HW book Page 12 Monday July 1 2013 4 51 PM...
Page 20: ...20 Safety instructions ACS880 01 HW book Page 20 Monday July 1 2013 4 51 PM...
Page 26: ...26 Introduction to the manual ACS880 01 HW book Page 26 Monday July 1 2013 4 51 PM...
Page 80: ...80 Planning the electrical installation ACS880 01 HW book Page 80 Monday July 1 2013 4 51 PM...
Page 96: ...96 Electrical installation 8b R8 R9 ACS880 01 HW book Page 96 Monday July 1 2013 4 51 PM...
Page 98: ...98 Electrical installation 16 13 R8 R9 ACS880 01 HW book Page 98 Monday July 1 2013 4 51 PM...
Page 118: ...118 Start up ACS880 01 HW book Page 118 Monday July 1 2013 4 51 PM...
Page 120: ...120 Fault tracing ACS880 01 HW book Page 120 Monday July 1 2013 4 51 PM...
Page 131: ...Maintenance 131 3 4 5 3 ACS880 01 HW book Page 131 Monday July 1 2013 4 51 PM...
Page 172: ...172 Technical data ACS880 01 HW book Page 172 Monday July 1 2013 4 51 PM...
Page 196: ...196 Dimension drawings ACS880 01 HW book Page 196 Monday July 1 2013 4 51 PM...
Page 209: ...Safe Torque off function 209 Certificate ACS880 01 HW book Page 209 Monday July 1 2013 4 51 PM...
Page 210: ...210 Safe Torque off function ACS880 01 HW book Page 210 Monday July 1 2013 4 51 PM...
Page 220: ...220 Resistor braking ACS880 01 HW book Page 220 Monday July 1 2013 4 51 PM...