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Safety functions 185
Case B
: This applies when the drive stops modulating before the SSM monitoring
limit has been reached.
A
SSM1 limit positive (parameter
)
B
SSM1 limit negative (parameter
C
Time to zero speed (parameter
When the drive stops modulating, SSM1
indication goes on after this delay.
SSM limits (A and B)
Step Description
1
The SSM1 request is received (for example, from the I/O) and the FSO starts the
SSM1 monitoring. The motor speed is not between the SSM1 limit positive (A) and
SSM1 limit positive (B). The SSM1 indication is off.
2
The drive stops modulating and the FSO starts a counter for time C. The motor speed
starts to decelerate. While the drive is not modulating, the state of the FSO outputs is
based on the latest speed information from modulation.
3a
The drive starts to modulate again and the FSO receives the actual motor speed again.
The motor speed is between the SSM1 limit positive (A) and SSM1 limit positive (B),
and the SSM1 indication goes on.
3b
Time C has elapsed, but the drive is still not modulating. The FSO assumes that the
motor has stopped.
4
The SSM1 request is removed and the FSO stops the SSM1 monitoring. The SSM1
indication goes off.
SSM1 state &
indication (3a)
SSM1 request
Motor speed
Time
A
1
B
2
4
3b
STO.14
C
3a
SSM1 state &
indication (3b)
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 ...