Use
1.
Open the activation switch, or activate the safety functionality that is wired to the STO
connection.
2.
The STO inputs on the drive control unit de-energize, and the control unit cuts off the
control voltage from the output IGBTs.
3.
The control program generates an indication as defined by parameter
31.22
(refer to
the firmware manual of the drive).
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
supply and all other voltage sources.
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 or drive control
program. It is not supported by supply, DC/DC converter or brake firmware.
WARNING!
(With permanent magnet or synchronous reluctance [SynRM] motors only)
In case of a multiple IGBT power semiconductor failure, the drive can produce an
alignment torque which maximally rotates the motor shaft by 180/
p
degrees (with
permanent magnet motors) or 180/2
p
degrees (with synchronous reluctance
[SynRM] motors) 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.
The Safe torque off function 193
Summary of Contents for ACS880-37LC
Page 1: ... ABB INDUSTRIAL DRIVES ACS880 37LC drives Hardware manual ...
Page 2: ......
Page 4: ......
Page 78: ...78 ...
Page 116: ...116 ...
Page 134: ...5 Set the real time clock 134 Maintenance ...
Page 144: ...144 ...
Page 167: ... Dimension drawing examples ACS880 37LC 0390A 7 with main contactor Dimensions 167 ...
Page 169: ...ACS880 37LC 1270A 7 with common motor terminal cubicle Dimensions 169 ...
Page 170: ...ACS880 37LC 1940A 7 with common motor terminal cubicle 170 Dimensions ...
Page 172: ...Location and size of input terminals Contact ABB for details 172 Dimensions ...
Page 174: ...Inverter module cubicle with two R8i modules bottom cable exit 174 Dimensions ...
Page 175: ...Inverter module cubicle with three R8i modules bottom cable exit Dimensions 175 ...
Page 176: ...Brake chopper cubicle D150 176 Dimensions ...
Page 178: ...Cubicle width 300 mm top cable exit 178 Dimensions ...
Page 179: ...Cubicle width 400 mm bottom cable exit Dimensions 179 ...
Page 180: ...Cubicle width 400 mm top cable exit 180 Dimensions ...
Page 181: ...Cubicle width 600 mm bottom cable exit Dimensions 181 ...
Page 182: ...Cubicle width 600 mm top cable exit 182 Dimensions ...
Page 198: ...198 ...
Page 200: ...200 ...