Schneider Altivar 28 Manual De Usario página 87

Settings
Adjust menu S S S S E E E E t t t t - - - -
Code Assignment
2nd acceleration ramp time
- - - - A A A A C C C C 2 2 2 2
2nd deceleration ramp time
- - - - d d d d E E E E 2 2 2 2
These parameters are accessible if the ramp switching threshold (Frt
parameter in the drC- menu) is other than 0 Hz or if a logic input is assigned
to ramp switching.
- - - - L L L L S S S S P P P P Low speed
- - - - H H H H S S S S P P P P High speed : ensure that this setting is appropriate for the motor and the
application
- - - - I I I I t t t t H H H H Current used for the motor thermal protection. Set ItH to the nominal current
marked on the motor rating plate.
To disable thermal protection, increase the value to the maximum (ntH
displayed).
- - - - U U U U F F F F r r r r Optimizes the torque at very low speed
Ensure that the value of UFr is not too high which will cause the motor to
saturate.
- - - - S S S S L L L L P P P P Adjusts the slip compensation around the value set by the nominal motor
speed. This parameter only appears if parameter UFt = n in the drC- menu.
- - - - F F F F L L L L G G G G Frequency loop gain, acts primarily when brA=YES (see page 84) and
during deceleration.
Practical advice:
- machines with high inertia: gradually reduce the value in the event of
overvoltage faults on deceleration (OBF)
- machines with fast cycles or low inertia: gradually increase the gain FLG
to optimize the following of the deceleration ramp (dEC) and limit the num-
ber of overvoltage faults on deceleration (OBF)
Too high a gain may result in operating instability.
- - - - I I I I d d d d C C C C Level of DC injection braking current
After 5 seconds the injection current is peak limited at 0.5 Ith if it is set at a
higher value.
(1) In is the nominal speed controller current shown in the catalog and on the speed controller rating
plate.
The parameters in shaded boxes appear if the corresponding functions have been configured
in the drC- or I-O- menus.
(continued)
Adjustment Factory
range setting
0.0 to 3600 s 5 s
0.0 to 3600 s 5 s
0 to HSP 0 Hz
LSP to tFr bFr
0.20 to 1.15 In (1)
In (1)
0 to 100 % 20
0.0 to 5.0 Hz According
to controller
rating
0 to 100 % 33
0.1 ItH to 0.7 In (1)
In (1)
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