Parameters For The Sse Function - ABB ACS880 Series Manual

40 Parameter settings
Index Name
STO.14 Time to zero speed
with STO and modoff
SBC usage
SBC.11 STO SBC usage

Parameters for the SSE function

￭
These parameters are related to the Safe stop emergency (SSE) function of the FSO module.
The SLS and SMS functions activate the SSE function if the motor speed reaches a trip
Example value Description
2000 ms The time it takes for the motor to coast to a
standstill from maximum process speed.
This must be measured with Drive composer
pro PC tool when an encoder is used for
motor control (otherwise you have to make
sure that the motor shaft has stopped rotat-
ing by other means, eg, visually.).
Acknowledgement is allowed after coast
stop in the STO, SSE and SS1 functions
(when SBC is not used). If SBC is used, see
parameter SBC.13 SBC time to zero speed.
If an external request activates the STO
function, this parameter sets the time after
which the function is completed and the STO
completed indication goes on. In this case,
parameter STO.13 Restart delay after STO
defines the time after which the acknow-
ledgement is allowed.
If the drive STO is activated or modulation
stopped while a monitoring safety function
is indicating "unsafe", after this time acknow-
ledgement is allowed. For example, if the
drive modulation is lost during SLS deceler-
ation ramp, SLS OK will be indicated after
this time has elapsed.
When an encoder is used: This parameter
is relevant only if there is an encoder failure
and the FSO module activates the STO
function.
None Activates/deactivates the control of a
mechanical brake of the motor.
None: This feature is not in use.
In this manual, it is assumed that you do not
use a brake. If you do, you must take care
of its on/off control by the FSO module and
change this and other settings. See the FSO
module user's manual.
Note: In option +Q978, the SBC function is
used to control the main contactor/breaker.
Do not change this setting.