ABB ACS880-17, Руководство пользователя

Страница: 24 / 58

24 Option description and instructions

Time schemes with a safety encoder
Emergency stop, stop category 0
This time scheme diagram illustrates the operation of the Emergency stop, stop category 0
safety function when a safety encoder is used. This option uses the Safe torque off (STO)
function of the FSO-21 module. For more information, see
FSO-21 safety functions
module user’s manual (3AXD50000015614 [English]).
A Zero speed with encoder: Speed limit at which the motor has stopped, the safety function is
completed and the emergency stop indication lamp goes on (parameter
FSOGEN.52 Zero speed
with encoder ).
B Restart delay: Delay from pushing the emergency stop button (and activation of the STO function) to
the moment that the user can push the reset button at the earliest (and acknowledge the STO
function). With this parameter, it is possible to allow a restart of the drive while the motor is still
running (fly-start) (parameter
STO.13 Restart delay after STO ).
Step Description
1 The user pushes the emergency stop button and the FSO module activates the FSO and drive STO
functions.
The FSO module starts a counter for time B.
Note : The safety function request to the FSO module must be active for at least 20 ms.
2 The user releases the emergency stop button.
3 Time B has elapsed. The user can push the reset button, that is, acknowledgement of the STO
function is possible even though the motor is still running. (In this example, the user pushes the reset
button in step 5.)
4 The motor speed goes below the zero speed limit (A). The motor has stopped and the emergency
stop indication lamp goes on.
5 The user pushes the reset button (this resets the emergency stop circuit and removes the emergency
stop request from the FSO module).
Note : The pressing time of the reset button must be between 0.3 s...3 s.
6 The FSO module deactivates the STO function in the drive. The emergency stop indication lamp
goes off. The drive is ready for a restart.
Time
Motor speed
1
4
5
E-stop button
(STO request)
Drive STO
status
Reset button
Indication lamp
STO.13
6
B
2
3
A