(3b) Time B has elapsed. The FSO module starts SLS monitoring (if not already started).
Note:
If the motor speed is above the SLS monitoring limit after time B has elapsed,
the FSO module activates the SSE function. Depending on SSE function parameter
settings, the motor either coasts to a stop (“Immediate STO”) or ramps down to zero
speed (“Emergency ramp”). For more information, see section Parameters for the SSE
function and the FSO module user’s manual.
Note:
In this case, the FSO activates the SLS indication when the motor speed goes
below the SLS limit positive (C).
Note:
In the +Q978 option, the SBC function is used to control the main
contactor/breaker. If you have this option in the drive, the main contactor/breaker is
opened if the SLS trip limit is reached.
4.
The user or a PLC deactivates the SLS request of the FSO module, that is, switches
the digital input of the FSO module from 0 to 1.
The FSO module acknowledges the SLS function automatically. This is set to be
automatic by an FSO parameter (SLSx.02), and no external acknowledgement input is
in use. The FSO module stops SLS monitoring and de-energizes the digital output that
indicates the SLS status. The drive returns to normal operation and starts to follow its
ordinary speed reference. The drive accelerates the motor to the desired speed along
its acceleration ramp (drive parameter).
5.
Normal operation.
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 time
A
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
20 Option description
