SLS with speed above the monitored speed - ramp monitoring
This time scheme diagram illustrates the operation of the SLS function with ramp monitoring.
The motor speed is above the monitored speed when the SLS function is activated.
1 2 3 4
SLS request
SLS status &
indication
5
A
B
C
2b
3b
Motor speed
Time
D
Safety function response timeA
SLS1 limit positive (parameter 200.23)
B
SLS1 trip limit positive (parameter SLSx.14)
C
Zero speed with encoder (parameter FSOGEN.52). Relevant only if (2b) occurs.
D
1. The user or a PLC de-energizes the applicable digital inputs of the FSO module. This
activates the SLS request.
2. After the safety function response time (A), the drive starts to decelerate the motor speed.
The ramp is defined and monitored using the SAR1 parameters of the FSO module. The
FSO module monitors the actual deceleration rate of the motor against the ramp
monitoring settings. The FSO module starts SLS monitoring and energizes the digital
output that indicates the SLS status when the motor speed is in the middle of the SLS1
trip limit and the SLS1 limit.
(2b) If the motor speed does not follow the ramp monitoring limits, the FSO module
activates the STO function. The motor coasts to a stop.
Note: In option +Q978, the SBC function is used to control the main contactor/breaker.
If the drive has this option and a trip limit hit occurs, STO activation causes the main
contactor/breaker to open.
Note: In this case, the FSO activates the SLS indication when the motor speed goes
below the SLS1 limit positive (B).
22 Option description
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