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Engineering Information
Rated data corresponding to the selection and ordering data
S The rated values for the motors are specified for two operating points, 50 Hz
and the max. frequency. A prerequisite is operation with V/f=constant.
S At higher frequencies, the rated torque slightly increases.
S The torque in the specified frequency range (13.3 and 20 Hz up to f
stant for the specified current.
S The stall torque in the frequency range is a minimum M
lue is maintained, also briefly at low frequency/speeds with the appropriate vol-
tage boost.
S In the defined frequency range, the motor power increases proportionally with
the speed/frequency (M = const.).
Voltage
S The standard insulating system of 1FU8 motors is designed so that operation is
possible up to 400 V without any restrictions. For operation with voltages
400 – 500 V, the motor is especially tested. Special measures are required for
voltages > 500 V.
Caution
The specified voltages do not refer to the voltages obtained by partial control of the
frequency converter.
S The output voltage of the frequency converter should be parameterized corres-
ponding to the rating plate. A voltage boost should be provided at low frequen-
cies/speeds.
Cable length
If the motors are fed through long feeder cables, then increased voltage levels
occur at the motor terminals as a result of the voltage edges of the frequency
converter output voltage. This means that at the motor, not only are voltage
blocks present that have the amplitude of the DC link voltage but also maximum
peak voltage values up to twice this value can briefly occur.
The appropriate smoothing and filter measures must be provided. The speci-
fications of the frequency converter manufacturer must be clearly maintained.
Siemens AG, 2003. All rights reserved
SIEMOSYN Motors, 1FU8 (PFU) – 09.03 Edition
5
) is con-
max
w 1.35 x M
; this va-
k
N
1FU8/5-65
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