Siemens simovert masterdrives Configuration Manual

Motor Components
5.3 Armature short-circuit braking
General Section for Synchronous Motors
Configuration Manual, (PJAL), 11.2005 Edition, 6SN1 197-0AD07-0BP4
5-5
Rating
The resistor can be dimensioned so that a surface temperature of 300° C can occur briefly
(max. 500 ms). In order to prevent the resistor from being destroyed, braking from the rated
speed can occur max. every 2 minutes. Other braking cycles must be specified when
ordering the resistors. The external moment of inertia and the intrinsic motor moment of
inertia are decisive when dimensioning these resistors.
The kinetic energy must be specified when ordering in order to determine the resistor rating.
W = ½ ∙J ∙ ω
2
W in [Ws]
J in [kgm
2
]
ω in [s
-1
]
Braking times and braking distances
The braking time is calculated using the following formula:
Braking time:
%
1WRW
%
•9.55
•
=
M
nJ
t
Moment of inertia J [kgm
2
]
Rated speed n
N
[RPM]
Moment of inertia:
H[WWRW PRW
+= JJJ
Average braking torque M
B
[Nm]
Braking time t
B
[s]
Braking distance:
•=
%PD[
stV
2
1
Braking distance s [m]
Velocity V
max
[m/s]
Notice
When determining the run-on distance, then, for example, the friction (taken into account as
allowance in M
B
) of the mechanical transmission elements and the switching delay times of
the contactors must be taken into consideration. In order to prevent mechanical damage,
mechanical end stops should be provided at the end of the absolute traversing range of the
machine axes.

Siemens simovert masterdrives Specifications

General

Brand	Siemens
Model	simovert masterdrives
Category	DC Drives
Language	English