Emergency stop, stop category 1 with time monitoring
This time scheme diagram illustrates the operation of the Emergency stop, stop category
1 safety function with time monitoring when a safety encoder is used. This option uses the
Safe stop 1 (SS1) function of the FSO-21 module.
Case A: The motor speed reaches the zero speed limit within the user-defined time
Time
Motor speed
1 2
6a 7a
E-stop button
(SS1 request)
Drive STO
status
Reset button
B
5a
C
4a
A
Indication lamp
3a
SS1.14
Contactor
(SBC output)
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. a) The motor speed goes below the zero speed limit (B). The FSO module activates
the drive STO and SBC functions (this opens the main contactor/breaker). The
emergency stop indication lamp comes on. The user can push the reset button, that is,
the acknowledgment of the STO function is possible.
Note: You can set an additional delay for the STO and SBC activation (parameter
SS1.15 SS1-r ramp zero speed delay for STO).
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.
28 Option description
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