NORD Drivesystems BU0750 User Manual
Page 83
BU 0750 GB-3311
Subject to technical amendments
83
Parameter
Setting value / Description / Note
Parameter
set
Available in Option
P104
Minimum frequency
P
Always visible
0.0 ... 400.0 Hz
[ 0.0 ]
The minimum frequency is the frequency supplied by the FI as soon as it is enabled and no
additional setpoint is set.
In combination with other setpoints (e.g. analog setpoint or fixed frequencies) these are added to the
set minimum frequency.
This frequency is undershot when
a. the drive is accelerated from standstill.
b. The FI is blocked. The frequency then reduces to the absolute minimum (P505) before it is
blocked.
c. The FI reverses. The reverse in the rotation field takes place at the absolute minimum
frequency (P505).
This frequency can be continuously undershot if, during acceleration or deceleration, the function
"Maintain frequency" (Function Digital input = 9) is executed.
P105
Maximum frequency
P
Always visible
0.1 ... 400.0 Hz
[ 50.0 ]
The frequency supplied by the FI after being enabled and once the maximum setpoint is present,
e.g. analog setpoint as per P403, a correspondingly fixed frequency or maximum via the ControlBox.
This frequency can only be overshot by the slip compensation (P212), the function "Maintain
frequency" (function digital input = 9) or a change to another parameter set with lower maximum
frequency.
P106
Ramp rounding
P
Always visible
0 ... 100 %
[ 0 ]
This parameter enables a smoothing of the acceleration and deceleration ramps. This is necessary
for applications where gentle, but dynamic speed change is important.
Ramp smoothing is carried out for every setpoint change.
The value to be set is based on the set acceleration and deceleration time, however values <10%
have no effect.
The following then applies for the entire acceleration or deceleration time, including rounding:
100%
%
P106
t
t
t
P102
P102
TIME
ON
ACCELERATI
tot
100%
%
P106
t
t
t
P103
P103
TIME
ON
DECELERATI
tot
P102
P103
Output
frequency
Setpoint
frequency
Time
Each
10
– 100% of P102
Each
10
– 100% of P103