6. a) The user pushes the reset button (this resets the emergency stop circuit and
acknowledges the STO function).
7. a) 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.
Case B: The motor speed does not reach the zero speed limit within the user-defined time
Time A has elapsed from the emergency stop command (step 1) but the motor speed still
exceeds the zero speed limit.
Time
Motor speed
1 2
E-stop button
(SS1 request)
Drive STO
status
Reset button
A
B
4b
C
Indication lamp
3b
SS1.14
Contactor
(SBC output)
7b6b
5b
Security delay: When time A has elapsed from the start of the timer (step 1), the FSO module
activates drive STO and SBC functions (case B). Activation of the SBC function opens the
main contactor/breaker). In case A, the FSO module has already activated the STO and SBC
functions. This is a user-defined value (parameter SS1.14 SS1-t delay for STO).
A
Zero speed limit: Speed limit for activating the drive STO and SBC functions. Activation of the
SBC function opens the main contactor/breaker. This is a user-defined value (parameter
FSOGEN.52 Zero speed with encoder).
B
Safety function response time.C
1. The user pushes the emergency stop button (this activates the SS1 function of the FSO
module). The FSO module starts a timer for delay A.
2. The drive starts to decelerate the motor along the user-defined stop ramp (SAR1
parameter 200.112 SAR1 ramp time to zero).
3. b) The FSO module activates the drive STO and SBC functions, and opens the main
contactor/breaker. The motor coasts to a stop.
4. b) The motor speed reaches the zero speed limit (B). The emergency stop indication
lamp comes on. The user can push the reset button, that is, the acknowledgement of
the STO function is possible.
5. b) The user releases the emergency stop button.
Option description 29
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