Siemens SIMODRIVE 611 digital Configuration Manual page 303

Aotewell Ltd
05.01 11.05
© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
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If the motor data are not known, then for motors with a high current (rated
current 85 A), the converter current should be dimensioned for a pulse
>
frequency of 4950 Hz. This means that a drive converter reduction factor of
approx. 83% is obtained.
S
For motors that require a higher motor frequency than 500 Hz, the drive con-
verter pulse frequency must be increased.
The following formula applies:
w 6 • f
f
T max mot
f Inverter clock cycle frequency of the drive converter in Hz,
T
refer to Chapter 4.4.1
f Max. motor stator frequency
max mot
It should be noted that for inverter clock cycle frequencies above 3200 Hz,
the module current rating must be reduced or, if required, a module with a
higher–current rating must be selected.
S
The max. field–weakening range for induction motor operation is limited.
The following relationships apply:
2 for high–speed motors (max. output frequency > 300 Hz),
n
Standard motors
max
v
n
FS
5 for wide–range motors
n Max. motor speed
max
n Speed at the start of field weakening for the motor
FS
An approximate value can
be calculated with n [
FS
If a motor is changed–over from delta to star operation and vice versa, and
auxiliary and main contactors are required for each motor. The motor con-
tactors must be mutually interlocked. The changeover is only made when
the pulses are inhibited using select terminal signals. When the changeover
command is issued, the motor data set is re–loaded and the auxiliary con-
tactors are controlled via the selector relay.
Parallel operation of several induction motors, refer to Chapter 8.12.1.
S
The voltage drop across a series reactor depends on the motor current and
the motor frequency. If an unregulated infeed is used, the maximum rated
motor voltage depends on the line supply voltage available.
If these guide values are not observed, then this can have a negative impact
on the power (lower power) in the upper speed range.
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8 Important Circuit Information
8.11 Series reactor
•
n
U
n
DC link
(refer above)
• V
1.6
nmot
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