Safety functions 117
SLS reaction if modulation is lost with Monitoring and modoff delay time
disabled
The operation of the SLS function in case the modulation of the drive is lost during the
deceleration ramp with Monitoring and modoff delay time disabled selected
(parameter SLSx.05 is set to Monitoring and modoff delay time disabled) is described
in the time diagram and table below. For configuration, see section
SLS function behavior when drive modulation is lost
.
B
Actual motor speed (coasting after modoff)
C
SLS trip limit
D
SLS limit
Step Description
1
The SLS request is received. The motor speed is above the SLS limit.
The drive starts to ramp down the motor speed.
The drive (parameter 23.13 or 23.15) defines the deceleration ramp until the speed
reaches the SLS limit.
The FSO starts to monitor the SLS time delay (parameter SLSx.04)
2
The drive trips on a fault, there is a drive power loss, or user stops the drive by coast
stop.
SLS delay time monitoring is switched off (parameter SLSx.04) as Monitoring and
modoff delay time are disabled.
delay starts.
3
If modulation does not return, SLS indication goes on after STO.14 delay has elapsed.
SLS indication
Motor speed
Time
1
3
2
B
Drive modulation
SLS request
SLSx.04 time
delay monitoring
C
D
STO.14 delay
Summary of Contents for FSO-12
Page 1: ... OPTIONS FOR ABB DRIVES FSO 12 safety functions module User s manual ...
Page 4: ......
Page 12: ...12 Table of contents ...
Page 36: ...36 Safety information and considerations ...
Page 136: ...136 Safety functions ...
Page 196: ...196 PROFIsafe 5 To read the diagnostic messages select the I O Device Diagnostics tab ...
Page 200: ...200 PROFIsafe ...
Page 326: ...326 Start up ...
Page 386: ...386 Dimension drawings ...