￭
Reference ramping
Acceleration and deceleration ramping times can be set individually for speed and
torque reference.
With a speed reference, the ramps are defined as the time it takes for the drive to
accelerate or decelerate between zero speed and the value defined by parameter
46.1. The user can switch between two preset ramp sets using a binary source
such as a digital input. For speed reference, also the shape of the ramp can be
controlled.
With a torque reference, the ramps are defined as the time it takes for the reference
to change between zero and nominal motor torque (parameter 1.30).
Special acceleration/deceleration ramps
The acceleration/deceleration times for the jogging function can be defined
separately; see section Jogging (page 85).
A deceleration ramp can be defined for emergency stop (“Off3” mode).
Settings and diagnostics
Parameters:
• Speed reference ramping: 23.11 Ramp set selection…23.19 Shape time dec 2
and 46.1 Speed scaling (page 368).
• Torque reference ramping: 1.30 Nominal torque scale (page 136), 26.18 Torque
ramp up time (page 299) and 26.19 Torque ramp down time (page 299).
• Jogging: 23.20 Acc time jogging (page 273) and 23.21 Dec time jogging (page 273).
• Emergency stop (“Off3” mode): 23.23 Emergency stop time (page 273).
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Constant speeds
Constant speeds are predefined references that can be quickly activated, for
example, through digital inputs. It is possible to define up to 7 constant speeds
for speed control.
WARNING!
Constant speeds override the normal reference irrespective of where the
reference is coming from.
The constant speeds function operates on a 2 ms time level.
Settings and diagnostics
Parameter groups: 22 Speed reference selection (page 263).
78 Program features
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