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Electrical Design
2.1 Rated values
A rated value (e.g. current, voltage, torque, power) is that value which can be out-
put or drawn at the specified voltage and frequency in continuous operation, uti-
lized to temperature Class F, and installation altitude up to max. 1000 m above sea
level as well as a 40 °C ambient temperature.
2.2 Voltages, currents, frequencies
SIEMOSYN motors have windings up to 350 Hz.
For the motors listed in the Technical Data, various voltages, referred to 50 Hz are
obtained depending on the max. output frequency at 400 V.
The motor windings have been designed so that for a constant V/f ratio
(M = const.), 400 V is connected as maximum voltage.
The winding versions available are specified at the 11th position of the Order No. –
refer to Table 2-1.
Table 2-1
Max. output-frequency at
400 V
f
max
Non-standard
In order to optimally dimension SIEMOSYN 1FU8 motors, the winding can be
adapted to the customer's application (11th position of the Order No.: "9", the volt-
age and frequency is specified in plain text).
Siemens AG, 2003. All rights reserved
SIEMOSYN Motors, 1FU8 (PFU) – 09.03 Edition
Winding versions
voltage at 50 Hz
(HZ)
U
50
100
160
200
250
Non-standard
Rated-
11th position of the
Order No.
1FU8VVV–VVVV
N50Hz
400
200
125
100
80
2
V/f-
ratio
(V/Hz)
⇓
8
8
6
4
3
2.5
2
2
1
1.6
9
Non-standard
1FU8/2-23
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