NORD Drivesystems BU0510 - Manual (Page 33)

3 Description of function
BU 0510 GB-3911 Subject to technical alterations 33
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.
The S ramp function is disabled during a reference point run.
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.
The S ramp function is disabled during a reference point run.
NOTE
The parameter P106 "Ramp Smoothing" 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.