Voltage Protection Module; Examples - Siemens SIMOTICS T-1FW6 Configuration Manual

Configuration
6.3 Examples
I = P
Line
If the Active Infeed is operated according to the factory setting, i.e. with a line-side power
factor of cosφ
formula can be simplified to
I = P
Line
The Active Infeed must now be selected such that the permissible line current of the Active
Infeed is higher or equal to the required value I
6.2.11

Voltage Protection Module

The VPM Voltage Protection Module is used for motors with an EMF of Û > 820 V to 2000 V
(U
eff
fault.
The VPM identifies an excessively high DC link voltage (U
motor feeder cables and therefore brakes the motor. The energy remaining in the motor is
converted into heat as a result of the short-circuit in the VPM and in the motor winding.
The maximum speed n
Module VPM is required.
You can dimension the VPM using the following formula to calculate the motor short-circuit
current I
I = k
K
The explanations of the codes used in the formula can be found in Chapter "Technical data
and characteristics".
6.3

Examples

Note
The data used here may deviate from the values specified in "Technical data and characteristics".
This does not affect the configuration procedure, however.
108
/ (√3 • U • cosφ
Line Line
= 1, so that it draws only pure active power from the supply, then the
Line
/ (√3 • U ).
Line Line
> 570 V to 1400 V), in order to limit the DC link voltage at the drive system in the case of a
MAX,INV
:
K
/ (3 • p • L )
T STR
).
Line
.
Line
is specified in the data sheets, where no Voltage Protection
> 820 V), short-circuits the three
DC
1FW6 Built-in torque motors
Configuration Manual, 09/2022, A5E52220645B AA