74 Safety functions
SS1 ramp functions when drive modulation is lost
The operation of SS1-r and -t functions in a situation where drive modulation is lost
during the deceleration ramp is described below.
The operation of SSE function in this situation is otherwise similar, but SSE
indications are shown instead of SS1 indications.
With safe speed estimation
With both SS1-r and SS1-t, STO function is activated right away when the modulation
is lost but the SS1 indications are operational. STO cascading is not activated in this
case. The completed indication of the STO function is not indicated (STO.22), instead
the SS1 completed indication (SS1.22) is activated. Otherwise STO function (and
SBC, if in use) behaves as configured.
A
Zero speed (parameter
)
STO indication
Motor speed
Time
1
2
3
A
Drive modulation
SS1-r request
SAR1 monitoring
STO.14 counter on
SS1 completed
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 ...