ABB ACS880-07 User Manual page 22

22 Option description
3. a) The motor speed reaches the zero speed limit. The FSO module activates the drive
STO function and stops the ramp monitoring. The emergency stop indication lamp comes
on.
Note: You can set an additional delay for the STO activation (parameter SS1.15 SS1-r
ramp zero speed delay for STO).
4. a) The user releases the emergency stop button.
5. a) The user pushes the reset button (this resets the emergency stop circuit and
acknowledges the STO function).
6. a) The FSO module deactivates the STO function in the drive. The emergency stop
indication lamp goes off. The drive is ready for a restart.
Case B: The motor speed does not follow the user-defined stop ramp monitoring window
Motor speed
A
B
1
2
A Safety function response time.
B Zero speed limit: Speed limit for activating the drive STO function. This is a user-defined value
(parameter FSOGEN.51 Zero speed without encoder).
C Time to zero speed: When time C has elapsed from the start of the counter (step 3b, activation
of the STO function), Acknowledgement of the STO function is possible. The user must set
this to the time it takes for the motor to coast from the maximum speed to zero speed (para-
meter STO.14 Time to zero speed with STO and modoff).
1. The user pushes the emergency stop button (this activates the SS1 function of the FSO
module).
2. The drive starts to decelerate the motor along the user-defined stop ramp. The FSO
module starts the ramp monitoring (SAR1 parameters 200.112, SARx.21, SARx.22 and
SARx.02).
3. b) The FSO module activates the FSO and drive STO functions and stops the ramp
monitoring. The FSO module starts a counter for (C). The motor coasts to a stop.
STO.14
C
4b
3b
Time
5b 6b 7b
E-stop button
(SS1 request)
Drive STO
status
Reset button
Indication lamp