Rating; Braking Time And Deceleration Distance - Siemens SINAMICS S120 Configuration Manual

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6.4.2

Rating

The ratings of the resistors must match the particular I
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
6.4.3

Braking time and deceleration distance

The braking time is calculated using the following formula:
Braking time:
Moment of inertia:
Braking distance:
Synchronous Motors 1FK7
Configuration Manual, (PFK7S), Edition 12.2006, 6SN1197-0AD16-0BP1
Frizlen GmbH & Co. KG
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+40 (0) 7144 / 2076 - 30
info@frizlen.com
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W [Ws]
2
J [kgm
ω [s ]
-1
J • n
t =
9.55 • M
J = J +
1
s = V • t
2
6.4 Brake resistances (armature short-circuit braking)
t load capability. The resistor can be
2
]
2
Braking time t
Rated speed n
Average braking torque M
J
Moment of inertia J [kgm
Braking distance s [m]
Velocity V
Motor components
[s]
B
[RPM]
N
[Nm]
B
]
2
[m/s]
max
85