182 Safety functions
Safe speed monitor (SSM)
The SSM function provides a safe output signal to indicate whether the motor speed
is between user-defined limits. There are four separate SSM functions
(SSM1...SSM4) with separate monitoring limits and indications. Several SSM
functions can be active at the same time.
You can configure the SSM function to be permanently on or off, or to be activated
externally from the FSO module I/O or from a safety PLC.
You can use the SSM function with a safety encoder or with a safe speed estimate.
With an encoder, the FSO module is always aware of the exact motor speed. Without
an encoder, the speed information is valid only when the drive is modulating (see
section
SSM with a safe speed estimate
).
Note
: If there is a fault in the speed data and the SSM function is the only active
safety function, this does not trip the drive. This only removes the SSM indication and
generates a warning to the drive.
The operation of the SSM function is described in the time diagrams and tables
below. The SSM1 function is used as an example. For configuration, see section
A
SSM1 limit positive (parameter
B
SSM1 limit negative (parameter
)
SSM limits (A and B)
SSM1 state &
indication
SSM1 request
Motor speed
Time
A
4
1
B
2
3
5
6
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 ...