Parameters For The Sse Function - ABB ACS880 Series User Manual

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 safety functions described in this manual do not use this function, but the FSO module
can activate the SSE function in internal fault situations.
Index Name
SSE.13 SSE function
Example value Description
2000 ms Sets the time that is needed to coast the motor to a
standstill from maximum process speed. If this time is
not known, it can 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 rotating by other means, eg, visually).
Acknowledgement is allowed after coast stop in the
STO, SSE and SS1 functions (when SBC is not used).
If the drive STO is activated or modulation stopped
while a monitoring safety function is indicating "unsafe",
after this time acknowledgement is allowed. For ex-
ample, if the drive modulation is lost during SLS decel-
eration ramp, SLS OK will be indicated after this time
has elapsed.
STO function: This parameter sets the time after which
the STO function is completed and the STO completed
indication goes on. Parameter
after which the acknowledgement is allowed. Adjust
the value according to application requirements.
SS1 function: This parameter is used only when the
motor speed does not follow the ramp settings or the
time monitoring limit is exceeded and the FSO module
activates the STO function. Adjust the value according
to application requirements.
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 Sets how the mechanical brake is used together with
the STO function.
In the safety functions described in this manual, this
feature is not used and this parameter has value None.
ACS880-07/17/37 and ACS880-17LC/37LC drives with
the option +Q978: The SBC function is used in the
emergency stop implementation to control the auxiliary
safety relay(s) which is connected to the main contact-
or/breaker. Make sure that the value is Delayed brake.
Example value Description
Immediate STO Sets the type of the SSE function.
Immediate STO: The FSO module activates the drive
STO function immediately after the SSE request (stop
category 0).
Emergency ramp: The FSO module first ramps down
the motor speed and when the speed is below the zero
speed limit (parameter
activates the STO function (stop category 1). SAR0
parameters define the deceleration ramp (for more
information, see the FSO module user's manual).
For the safety functions described in this manual, ABB
has set this parameter to value Immediate STO at the
factory. Adjust the default value when necessary.
Parameter settings 47
STO.13 defines the time
FSOGEN.51 or FSOGEN.52) it