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184 Safety functions
SSM with a safe speed estimate
This section describes situations when an encoder is not used and the drive stops
modulating when the SSM monitoring is on.
Case A
: This applies when the drive stops modulating after the SSM monitoring limit
has been reached.
A
SSM1 limit positive (parameter
B
SSM1 limit negative (parameter
)
C
): 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 between the SSM1 limit positive (A) and SSM1
limit positive (B). The SSM1 indication goes on.
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 stays on.
3b
Time C has elapsed, but the drive is still not modulating. The FSO assumes that the
motor has stopped. The motor speed is still between the SSM1 limit positive (A) and
SSM1 limit positive (B), and the SSM1 indication stays on.
4
SSM1 request is removed and the FSO stops the SSM1 monitoring. The SSM1
indication goes off.
SSM1 state &
indication
SSM1 request
Motor speed
Time
A
1
B
2
3a
4
3b
C
Содержание FSO-21
Страница 1: ... OPTIONS FOR ABB DRIVES FSO 21 safety functions module User s manual ...
Страница 4: ......
Страница 16: ...16 Safety instructions ...
Страница 34: ...34 Safety information and considerations ...
Страница 52: ...52 Overview ...
Страница 236: ...236 PROFIsafe ...
Страница 265: ...PROFIsafe 265 2 Select your CPU from the list 3 Install the FENA 21 GSDML file ...
Страница 275: ...PROFIsafe 275 20 In ABB_Drive FB add blocks DPRD_DAT and DPWR_DAT 21 Insert values to blocks ...
Страница 282: ...282 PROFIsafe 5 To read the diagnostic messages select the I O Device Diagnostics tab ...
Страница 286: ...286 PROFIsafe ...
Страница 304: ...304 Installation ...
Страница 400: ...400 Configuration ...
Страница 488: ...488 Verification and validation ...
Страница 506: ...506 Fault tracing ...
Страница 514: ...514 Maintenance ...
Страница 536: ...536 Technical data ...
Страница 538: ...538 Dimension drawings 3AXD50000018513 ...