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104 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 (
), instead
the SS1 completed indication (
) is activated. Otherwise STO function (and
SBC, if in use) behaves as configured.
With safety encoder
The lost of modulation does not affect to the behaviour of these functions when they
are used with safety encoder. See the behaviour in section
on page
SS1 with time monitoring (SS1-t)
on page
.
With a safe speed estimate
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-21
Page 1: ... OPTIONS FOR ABB DRIVES FSO 21 safety functions module User s manual ...
Page 4: ......
Page 16: ...16 Safety instructions ...
Page 34: ...34 Safety information and considerations ...
Page 52: ...52 Overview ...
Page 236: ...236 PROFIsafe ...
Page 265: ...PROFIsafe 265 2 Select your CPU from the list 3 Install the FENA 21 GSDML file ...
Page 275: ...PROFIsafe 275 20 In ABB_Drive FB add blocks DPRD_DAT and DPWR_DAT 21 Insert values to blocks ...
Page 282: ...282 PROFIsafe 5 To read the diagnostic messages select the I O Device Diagnostics tab ...
Page 286: ...286 PROFIsafe ...
Page 304: ...304 Installation ...
Page 400: ...400 Configuration ...
Page 488: ...488 Verification and validation ...
Page 506: ...506 Fault tracing ...
Page 514: ...514 Maintenance ...
Page 536: ...536 Technical data ...