Lenze 490 Series Speed controllers tor DC motors - Manual (Page 11)

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daution: If the drive accelerates in an uncontrolled way,
open switch RFR immediately.
Terminals 1 and K of the field or armature voltage feedback
are interchanged. After having checked and corrected the
wiring, the commissioning can start again.
When the speed is stable, the desired maximum speed can
be set. Set the set value potentiometer or master voltage
to maximum. Turn trimmer n~
1~ clockwise, until the desired
maximum speed is obtained. Trimmer ~fein is used for the
fine setting of the maximum speed.
Turn trimmer V clockwise, until the drive becomes instable
<speed oscilla~ions), then turn trimmer V back by approx.
20%, until the drive is stable again. Usi~g trimmer IxR the
speed is stabilized such thata minimum change results for
the smallest speed between idle running and nominal bad.
Subsequently, the compensation of higher speeds must be
checked.
7.3.2 Speed control using tacho feedback
For tacho feedback the trimmer IxR must be set fully
anticlockwise.
Set the set value potentiometer or master
voltage to 0V. Open switch RFR. Switch on mains. LED RSP
and ±Vccare lit. Set the set value potentiometer or master
voltage to maximum. For master voltage operation, turn
clockwise, until +bOVDC are applied at the measuring point
Ml. Then set the set value potentiometer or master voltage
to approx. 10% of the final value. dose switch RFR. LED RSP
is not lit anylnore.
daution: If the drive accelerates in an uncontrolled way,
open switch RFR immediately.
Terminals 1 and K of the field or armature voltage feedback
are interchanged.
After having checked and corrected the
wiring, the commissioning can be start again.
When the speed is stable, the desired maximum speed can
be set. Set the set value potentiometer or master voltage
to maximu~n. Turn trimiuer n~1~ clockwise, until the desired
maximum speed is obtained. Trimmer ~fein is used for the
fine setting of the maximum speed. Turn trimmer V clock—
wise, until the drive becomes unstable <speed osc~llations),
then turn trimmer V back by approx. 5%, until the drive is
stable again.
For special applications (improved speed control behaviour
for exacter control pathes, speed control without
overshoot), a differential component can be installed. This
should only be done together with tachogenerators which have
an output voltage with very bw rippbe
(KTD3 or TDPO2).
Lanze