Siemens Simovert Masterdrives Compendium page 180

08.2012
6.2.3 Drive setting
Siemens AG 6SE7087-6QX70 (Version AN)
SIMOVERT MASTERDRIVES
During the drive setting, the control electronics is informed about the
incoming voltage supply with which the drive converter is operating,
about the connected motor and about the motor encoder. In addition,
the motor control (V/f open-loop control or vector control) and the pulse
frequency are selected. If required, the parameters necessary for the
motor model can be calculated automatically. Furthermore, the
normalization values for current, voltage, frequency, speed and torque
signals are determined during the drive setting.
For start-up of the induction motor, first enter the manufacturer's
parameters completely (see below):
♦ In doing so, you must observe whether the induction motor has a
star or a delta connection.
♦ You must always use the S1 data from the rating plate.
♦ You must enter the rating data for mains duty (not converter duty).
♦ You must always enter the correct rated motor current P102 (rating
plate). If there are two different rated currents on the rating plate for
special fan motors, you must use the value for M ~ n for constant
2
torque (not M ~ n ). A higher torque can be set with the torque and
active-current limits.
♦ The accuracy of the rated motor current has a direct effect on the
torque accuracy, as the rated torque is normalized to the rated
current. If a rated current is increased by 4 %, this will also
approximately result in a 4 % increase in the torque (referred to the
rated motor torque).
♦ For group drives, you have to enter the total rated current
P102 = x*I
mot,rated
♦ As the rated magnetizing current P103 (not to be confused with the
no-load current during operation with rated frequency P107 and
rated voltage P101) is usually not known, you can first enter 0.0 %.
An approximation value is calculated using power factor (cosPHI)
P104 and then entered in P103.
Experience shows that the approximation supplies values that are
rather on the large side in the case of motors with a high rating (over
800 kW), whereas it supplies values that are slightly too low in the
case of motors with low rating (below 22 kW).
The magnetizing current is defined as a field-generating current
component during operation at the rated point of the machine (U =
P101, f = P107, n = P108, i = P102).
♦ P294 = 1 ( = ˆ controlled, flux controller not active) should be set for
asynchronous motors in combination with the setting P296<3. In
V1.40 and higher, this is done in automatic parameterization.
♦ In field weakening, operation is permitted only up to twice the motor
transition frequency (2 x P293). When the controller structure
optimized for field weakening (P296=3) is selected for asynchronous
motors, field weakening is permitted up to 5 times the motor corner
frequency (5 x P293).
Compendium Motion Control
.
Parameterizing Steps
6-15