Calculation Of The Required Infeed; Voltage Protection Module - Siemens Simotics T-1FW6 Configuration Manual

Configuring
5.2 Configuring workflow
5.2.10

Calculation of the required infeed

Dimensioning the Active Infeed
Use the drive's power balance to dimension the Active Infeed.
The first important quantity to know is the mechanical power P
motor shaft. Based on this shaft output, the electrical active power P
supply system can be determined by adding the power loss of the motor P
loss of the Motor Module P
mechanical power P
P
Line
The active power to be drawn from the power system depends on the line voltage U
line current I
P
Line
This is used to calculate the required line current I
I
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
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
5.2.11

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 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".
96
:
mech
= P + P + P
mech V Mot V MoMo
and the line-side power factor cosφ
Line
= √3 • U • I • cosφ
Line Line
= P / (√3 • U • cosφ
Line Line
= 1, so that it draws only pure active power from the supply, then the
Line
= P / (√3 • U ).
Line Line
> 570 V to 1400 V), in order to limit the DC voltage at the drive system in the case of a
MAX,INV
:
K
/ (3 • p • L )
T STR
and the power loss of the Active Infeed P
V MoMo
+ P .
V AI
.
Line
).
Line
.
Line
is specified in the data sheets, where no Voltage Protection
to be produced on the
mech
to be drawn from the
Line
as defined by the relation
Line
of the Active Infeed as follows:
Line
> 820 V), short-circuits the three
DC
1FW6 external rotor built-in torque motors
Configuration Manual, 12/2020, A5E50516483B AA
, the power
V Mot
to the
V AI
, the
Line