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126
Manual – MOVIPRO® SDC with DeviceNet Interface
10
Explanation of the parameters
Parameterization of MOVIPRO
®
P916 Ramp type
This parameter specifies the type of positioning ramp. This influences the speed or ac-
celeration characteristics during positioning.
P917 Ramp mode
Setting range: Mode 1/mode 2
This parameter determines the use of
P912 Positioning ramp 2
(page 124) with ramp
type set to "linear".
• P917 = Mode 1: Deceleration for travel to target position (spot braking) takes place
with positioning ramp 2. Positioning ramp 1 is used for all other positioning
operations. If position interpolation 12 bit or 16 bit is active, it runs in mode 1 without
dead time compensation.
• P917 = Mode 2: Positioning ramp 2 is always used for deceleration if the travel speed
is changed during travel. Positioning ramp 1 is used for acceleration. If position
interpolation 12 bit or 16 bit is active, it runs in mode 1 without dead time
compensation.
P918 Bus setpoint
source
Setting range: 0 – 499 – 1023
In conjunction with EtherCAT, parameter P918 can be used to set the source for the set-
point in IPOS
plus®
.
Ramp type
Positioning characteristics
Linear
Optimum time, however block-shaped acceleration characteristic
Square
Softer acceleration and higher torque demand than "linear".
Sine
Very soft acceleration profile, required torque higher than with "Squared"
acceleration profile.
Bus ramp
Setting for operation of drive inverter with master controller. This controller
generates a cyclical position setpoint that is written directly to the position con-
troller. The ramp generator is deactivated. The position specifications sent
cyclically by the external controller are interpolated linearly. For configuration,
one process output data word must be set to "position high" and another one
to "position low".
Jerk limitation
Jerk limitation is based on the principle of the linear ramp. For jerk limitation,
the torque and, therefore, the acceleration is trapezoidal. Over time, jerk limi-
tation builds up the torque in linear form during acceleration until the maximum
value is reached. In the same way, the torque is reduced again over time in lin-
ear form to zero. This means that system vibrations can be virtually avoided.
You can set a value between 0.005 s and 2 s under
P933 Jerk time
(page 128).
The positioning time in comparison to the linear ramp is extended by the set
jerk time. The acceleration and torque do not increase in comparison with the
linear ramp.
0
0
I