NORD Drivesystems BU0210 - Manual (Page 27)

3 Function description
BU 0210 GB Subject to technical amendments 27
3.6 Position control functions (P600)
Four different positioning variants are possible.
Linear ramp with maximum frequency (setting [1])
The acceleration is linear. The speed of constant travel is always carried out with the "Maximum Frequency"
set under parameter P105.
Linear ramp with setpoint frequency (setting [2])
The acceleration is linear. The speed of constant travel is specified via the setpoint frequency. This can be
changed via the analog input or via a bus setpoint value.
S ramp with maximum frequency (setting [3])
The speed of constant travel is always carried out with the "Maximum Frequency" set under parameter P105.
However, in positioning operation the frequency ramps can be operated as S ramps. Compared with
conventional linear frequency increases (or decreases), according to the start-up time (or braking time) a gentle
rounding (without jerking) is performed to change from a static state to acceleration or braking. Also, when the
final speed is attained, the acceleration or deceleration is slowly reduced. The S ramp always corresponds to a
rounding of 100% and only applies, when positioning is also being performed. The effective ramp time is
doubled by S ramping.
S ramp with setpoint frequency (setting [4])
The speed of constant travel is specified via the setpoint frequency. However, in positioning operation the
frequency ramps are operated as S ramps. For further details, please refer to the previous paragraph.
The setpoint frequency can be changed via the analog input or via a bus setpoint value.
ATTENTION
The parameter P106 "Ramp Rounding" must still be set to "0" for positioning. If the enabling is
removed or a reference point run is carried out, the rounding is not effective.
NOTE: For the S ramp function, i.e. setting 3 or 4 it should be noted that during
reference point runs the S ramp is not active.