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Safety functions 77
SSE with immediate STO
The operation of the SSE with immediate STO function is described in the time
diagram and table below. For configuration, see section
A
Time to zero speed (parameter
): Time from the STO activation to the moment
when the safety function is completed, the SSE completed indication (parameter
) goes on and the acknowledgment becomes allowed. You must set this to the
estimated time in which the motor coasts to a stop from the maximum speed.
Step
Description
1
The SSE request is received (for example, from the I/O). The FSO activates the drive
STO function and starts a counter for time A.
2
After time A has elapsed, the FSO module defines the motor as stopped and the SSE
completed indication goes on. The acknowledgement becomes allowed as soon as
the SSE request has been removed (step 3).
3
The SSE request is removed.
4
After the acknowledgement, the SSE and STO functions are deactivated, and the
control is given back to the drive. The indications goes off.
Drive STO state
& indication
3
SSE request
Motor speed
Time
A
4
2
SSE completed
indication
1
SSE state &
indication
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 ...