Siemens SINUMERIK 840D sl Function Manual page 405

p1135[0...n] OFF3 ramp-down time
Sets the ramp down time from the maximum velocity to standstill for the OFF3
command.
Note:
This time can be exceeded if the maximum the DC link voltage is reached.
Unit: Default value:
s 0.000
p1226[0...n] Speed threshold for standstill detection
Sets the speed threshold for standstill (zero speed) detection
Acts on the actual value and setpoint monitoring.
When braking with OFF1 or OFF3, when the speed falls below this threshold,
standstill is detected.
The following applies if the brake control is not activated:
The pulses are canceled and the drive coasts down when the threshold is fallen
below.
See also: p1215, p1216, p1217, p1227
Notice: For compatibility reasons to previous firmware versions, when the Control
Unit powers up, a parameter value of zero in index 1 to 31 is overwritten with the
parameter value in index 0.
Note:
Standstill (zero speed) is detected in the following cases:
- the actual speed value falls below the speed threshold in p1226 and the time
started in p1228 has expired.
- the speed setpoint falls below the speed threshold in p1226 and the time started
in p1277 has expired.
Measuring noise occurs when sensing the actual value. Standstill cannot be de‐
tected if the speed threshold is too low.
Unit: Default value:
rpm 20.00
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Minimum value: Maximum value:
0.000 600000
Minimum value: Maximum value:
0.00 210000.00
Data descriptions
9.2 Parameters for SINAMICS S120
Checksum: Protection level:
2
Data type: Effectiveness:
FloatingPoint32 POWER ON
Checksum: Protection level:
2
Data type: Effectiveness:
Floating Point32 POWER ON
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