4. a) Time A has elapsed. The STO function is already active. In this case, this time has
no effect.
5. a) The user releases the emergency stop button.
6. a) Time D has elapsed. The emergency stop indication lamp comes on. The user can
push the reset button, that is, the acknowledgment of the STO function is possible.
7. a) The user pushes the reset button (this resets the emergency stop circuit and
acknowledges the STO function).
8. 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
D
Indication lamp
3b
SS1.14
SBC.13
Contactor
(SBC output)
7b6b
5b
Security delay: When time A has elapsed from the start of the counter (step 1), the FSO
module activates the 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.51 Zero speed without encoder).
B
Safety function response time.C
SBC time to zero speed: When time D has elapsed from the start of the counter (step 3b,
activation of the STO and SBC functions), the user can push the reset button, that is, the ac-
knowledgment of the STO function is possible. The user must set this time longer than the
time the motor coasts from the maximum speed to zero speed (parameter SBC.13 SBC time
to zero speed).
D
Option description 23
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