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Configuration 395
negative SMS trip limit is set close to zero speed, there is an increased possibility that
the error spike could cause an unnecessary trip.
This example also applies to:
• trip limit hits in the SLS1...4 and Variable SLS functions when the SLSx mute
times are disabled with parameter
all trip limit hit situations regardless of parameters
encoder is used.
Example 2
: SLS safe speed estimate trip limit hit situation
Note:
This example is for more complex systems which cannot be properly
configured with general transient mute time.
This example covers safe speed estimate trip limit situations with acceleration of an
induction motor. It is possible that safe speed estimate goes above the SLS trip limit
for limited time when an induction machine is accelerated with high load inertia. In
- - - Actual speed
Safe speed estimate
SMS trip limits
1
Error spike caused by the starting of the synchronous motor, spike duration 50 ms.
is set longer that the error spike and the SSE is not activated.
2
Safe speed estimate exceeds the SMS trip limit
3
has elapsed. SSE is activated.
2
Speed
Time
1
3
FSOGEN.31
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 ...