Parameterizing Steps 08.2012
6SE7087-6QX70 (Version AN) Siemens AG
6-16 Compendium Motion Control SIMOVERT MASTERDRIVES
♦ Input of rated frequency P107, rated speed P108 and number of
pole pairs P109 is necessary.
♦ In the case of induction motors, you should enter in P108 not the
synchronous no-load speed, but the true motor rated speed, i.e. the
slip frequency at rated load must be given by parameters
P107...P109.
♦ The rated motor slip (1 - P108/60 x P109/P107) should usually be
greater than 0.35 % x P107.
These low values are, however, only achieved in the case of motors
with a very high rating (above approx. 1000 kW).
Motors with average rating (45..800 kW) have slip values around
2.0...0.6 %.
Motors with low rating (below 22 kW) can also have slip values up to
10 %.
♦ If the rated motor frequency (engineered!) is below 8 Hz, you have
to set P107 = 8.0Hz in the drive setting. The rated motor voltage
P101 has to be calculated in the ratio 8 Hz / f
Mot,N
and the rated
motor speed
P108 should result in a much greater slip:
P108 = ((8 Hz - P107
old
) x 60 / P109) + P108
old
.
When leaving the "Drive setting" menu, the entered parameter values
are checked for plausibility. Parameter settings that are not plausible
will lead to a fault. The wrongly set parameters are entered in
parameter r949 (fault value).
If current control is selected as the motor control, a suitable sensor
board (SBx) must be inserted beforehand and a permissible motor
encoder selected. If this is not carried out, the unit will also generate a
fault when it tries to leave the "Drive setting" menu.
NOTE
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