￭ 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.
Time
Motor speed
1
5
6
Drive STO
status
Reset button
Indication lamp
2
Contactor
(SBC output)
B
STO.13
3
4
E-stop button
(STO request)
A
Zero speed with encoder: Speed limit at which the motor has stopped, the safety function is
completed and the emergency stop indication lamp comes on (parameter FSOGEN.52 Zero
speed with encoder).
A
Restart delay: Delay from pushing the emergency stop button (and activation of the STO
function) to the moment when the user can push the reset button at the earliest (and acknow-
ledge 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).
B
1. The user pushes the emergency stop button. The FSO module activates the FSO and
drive STO functions and opens the main contactor/breaker. The FSO module starts a
timer for delays A and B.
2. The user releases the emergency stop button.
3. Time B has elapsed. The user can push the reset button, that is, the acknowledgement
of the STO function is possible.
4. The motor speed goes below the zero speed limit (A). The emergency stop indication
lamp comes on.
5. The user pushes the reset button (this resets the emergency stop circuit and
acknowledges the STO function).
6. The FSO module deactivates the STO function in the drive and closes the main
contactor/breaker. The emergency stop indication lamp goes off. The drive is ready for
a restart.
Option description 27
To Next Page
Loading...
