Danfoss MCO 305 Design Manual page 214

MCO 305 Design Guide
32-8* Velocity & Acceleration
Use the following parameters to specify velocity,
acceleration, and ramp.
32-80 Maximum Velocity (Encoder)
VELMAX
Range [Unit]
1 – 100000 [RPM]
Function
VELMAX defines the rated speed of the drive. This
value is listed in RPM and is needed for the calcula-
tion of ramps and actual velocities.
NB!:
The nominal speed refers to the speed of
the encoder.
32-81 Shortest Ramp
RAMPMIN
Range [unit]
0.001 – 3600.000 [s]
Function
The RAMPMIN parameter determines the Shortest
Ramp (maximum acceleration). It indicates how
long the acceleration phase lasts at the very least
in order to achieve the rated velocity.
If you work with the MCO 305 then you should
always set the ramps via the option card and not in
the FC 300. The FC 300 ramps must always be set
to minimum.
32-82 Ramp Type
RAMPTYPE - 32
Option
Linear
S-ramp
Movements with limited jerk
Function
This parameter defines the ramp type: trapeze,
sinusoidal, or limited jerk. These ramp type are
relevant for all movements (POSA, POSR, CVEL,
and MOTOR STOP), but not with SYNCx.
default setting
214
__ Parameter Reference __
1500
1.000
[0]
[1]
[2]
[ ] value for use in communication via serial communication port
®
MG.33.L5.02 – VLT is a registered Danfoss trademark
Ramp type 0: trapeze
Ramp type 1: S- ramp
Ramp type 2: limited jerk
Movements with limited jerk start with acceleration
zero and increase acceleration by maximum Jerk
until the maximum acceleration which is defined by
par. 32-81 Shortest Ramp is reached. Then the
movement continues with maximum acceleration.
At the end the acceleration will be decreased by
maximum jerk until acceleration is zero again. The
maximum jerk is calculated by the parameter Jerk
Duration JERKMIN.
There are four different parameters for the
RAMPTYPE = 2 with limited jerk, see Limited Jerk
in chapter "Function and Samples".
See also program sample JerkMinTest.m.