ABB ACS880 User Manual page 38

38 Parameter settings
Index Name
SSE.16 SSE ramp zero
speed delay for STO
SBC usage
SBC.15 SSE/SS1 SBC speed
SAR0 ramp settings
200.102 SAR0 ramp time to
zero
200.202 SAR speed scaling
Example value Description
0 ms Sets an extra delay time for the inverter unit
STO activation at the zero speed in the SSE
function.
The FSO module uses a speed estimation,
which can differ from the actual shaft speed
of the motor. With this parameter, the FSO
module delays the STO activation so that
the inverter unit is able to reach the shaft
zero speed before the FSO module activates
the STO function.
The delay counter starts when the estimated
motor speed reaches the zero speed limit
(parameter FSOGEN.51). After this delay
has elapsed, the FSO module activates the
inverter unit STO. You can use this paramet-
er when the motor rotates a high inertia load.
Note: The FSO module activates the invert-
er unit STO immediately if the inverter unit
stops modulating before this delay has
passed (that is, the motor actual speed
reaches 0 rpm).
This parameter is relevant only if parameter
SSE.13 SSE function is set to Emergency
ramp.
0 rpm Sets the absolute speed below which the
mechanical brake of the motor is activated
while ramping.
0 rpm: The 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. Refer to the
FSO module user's manual.
1000 ms Sets the target time for the reference emer-
gency stop ramp SAR0 (used in the SSE
function).
Target time = Time in which the inverter unit
decelerates the motor from speed 200.202
SAR speed scaling to zero.
This parameter is relevant only if parameter
SSE.13 SSE function is set to Emergency
ramp. Adjust the default value when neces-
sary.
1500 rpm Sets a speed value that the FSO module
uses as a reference point in ramp parameter
calculations (both SAR0 and SAR1 ramps).
Adjust the default value when necessary.