6-13
49-SC Slip compensation On/Off [Decimal]
49-SC = 0 -> Slip compensation inactive
1 -> Slip compensation with 1st and 2nd data set active
2 -> Slip compensation only active with 2nd data set
Precondition for activation of the slip compensation:
Enter motor data (Type plate) 50-IN, 51-COS and 52-NN.
The purpose of the slip compensation is to maintain the speed constant
independently of load. In the basic setting range (0 to FN), a frequency
correction ∆F proportional to the effective current (15-IW) is added to
the actual frequency (12-F).
This ∆F is still corrected by t2he factor F/FN in the field weak range. The
frequency increase so calculated is however not displayed in the
parameter 12-F.
The slip compensation becomes effective at characteristics point
[VB
*
FN]. It increases linearly from 0 % at frequency [VB
*
FN], up to
100 % at frequency [2
*
VB
*
FN]. Furthermore it is effective up to 100 %
(See Fig. 6-8).
The entry of the frequency is only limited by parameter 94-MAXF. The
frequency correction is determined from the formula:
In the base range
IW = 15-IW (Effective current)
INU = Inverter rated current
FN = Param. 43-FN1 (Rated
frequency)
KSC = Param. 54-KSC (Correction
factor)
F = Param. 12-F (Act. frequency)
In the field weak range
50-IN Motor rated current [A]
Motor rated current from motor type plate.
Application with I∗R and slip compensation.
51-COS Rated cos
ϕϕ
ϕϕ
ϕ [%]
Cosϕ from motor type plate (to be entered in %).
Application with I∗R and slip compensation.
52-NN Rated speed [1/min]
Rated speed from motor type plate.
Application with I∗R and slip compensation.
∆F
KSC IW
I
FN
NU
=
∗
∗
∆F
KSC IW
I
F
FN
FN
NU
=
∗
∗∗
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