ZIEHL-ABEGG ZETADYN 3C, Original Operating Instructions

Page: 179 / 204

15.8.3 Functions with Open-Loop-operation
15.8.3.1 U/f-characteristic curve
With entering the motor data in the menu
motor name plate
the parameters "U0", "U1", "f1" and "f2"
will be pre-assigned. By these parameters the U/f-characteristic curve will be de
fi
ned. The U/f-
characteristic curve sets the motor voltage depending on the frequency of the rotating
fi
eld in the
stator.
U2
U1
U0
f1
f1 f
U
U/f-characteristic curve
15.8.3.2 Current-control
For improving the startin, the stopping as well as the travelling with a slow speed, the motor will be
energised with a minimum current (Parameter
Controller/I_IxR
). With the parameters FADE1 and
FADE2 the current can be set depending on the frequency (f) of the rotating
fi
eld in the stator.
f < FADE1:
If the frequency of the rotating
fi
eld in the stator is less than FADE1 the motor will be energised with
100% of I_IxR.
f > FADE2:
If the frequency of the rotating
fi
eld in the stator is greater than FADE2 the current I_IxR is 0
FADE1 < f < FADE2:
If the frequency of the rotating
fi
eld is between FADE1 and FADE2 the current-control depends on the
characteristic curve: the higher the frequency the lower is the current impression.
The characteristic curve is de
fi
ned by the values for FADE1 and FADE2.
I_IxR
FADE1 f
100 %
FADE2
Fader-function for the current-control
Original operating instructions
ZETADYN 3C
Special functions
R-TBA08_03-GB 1619 Part.-No. 00163322-GB
179/204