t
on
î™ /î™ s Braking duration
Tî™ /î™ s Cycle duration
Example for internal braking resistor application
A 1FL2104-4AG… serv
omotor with low moment of inertia (with integrated holding brake)
with a mechanical system is fed from a SINAMICS S200 6SL5510‑1BB11‑0A□0. It is to be
braked from 3000î™ r/min to 600î™ r/min with a braking duty cycle as t
on
= 0.05î™ s, T = 2î™ s.
Moment of inertia of the servomotor 1FL2104-4AGâ€¦î™ î™ î™ î™ î™ î™ î™ î™ î™ î™ J
mot
î™ =î™ 0.71î™ Ã— 10
-4
î™ kgm
2
Moment of inertia of the driven mechanical systemî™ î™ î™ î™ î™ î™ î™ î™ î™ î™ î™ î™ Jî™ =î™ 4î™ Ã—10
-4
î™ kgm
2
n
1
= 3000î™ r/minî™ î™ î™ î™ î™ î™ î™ î™ î™ î™ î™ î™ n
2
= 600î™ r/min
⇒ E
br
= 22.31î™ Jî™ <î™ E
max_int
= 292î™ Jî™ î™ î™ î™ (1î™ Jî™ =î™ 1î™ Ws)
⇒ P
br
= 446.26î™ Wî™ <î™ P
max_int
= 1884î™ W
⇒ P
avg
= 11.16î™ Wî™ <î™ P
cont_int
= 30î™ W
In this case, therefore, no external braking resistor is required.
Example for external braking resistor application
A 1FL2104-4AG… servomotor with low moment of inertia (with integrated holding brake)
with a mechanical system is fed from a SINAMICS S200 6SL5510‑1BB11‑0A□0. It is to be
braked from 6000î™ r/min to 600î™ r/min with a braking duty cycle as t
on
= 0.05î™ s, T = 2î™ s.
Moment of inertia of the servomotor 1FL2104-4AGâ€¦î™ î™ î™ î™ î™ î™ î™ î™ î™ î™ J
mot
î™ =î™ 0.71î™ Ã— 10
-4
î™ kgm
2
Moment of inertia of the driven mechanical systemî™ î™ î™ î™ î™ î™ î™ î™ î™ î™ î™ î™ Jî™ =î™ 8î™ Ã—10
-4
î™ kgm
2
n
1
= 6000î™ r/minî™ î™ î™ î™ î™ î™ î™ î™ î™ î™ î™ î™ n
2
= 600î™ r/min
⇒ E
br
= 170.21î™ Jî™ <î™ E
max_int
= 292î™ Jî™ î™ î™ î™ (1î™ Jî™ =î™ 1î™ Ws)
⇒ P
br
= 3404.18î™ Wî™ >î™ P
max_int
= 1884î™ W
⇒ P
avg
= 85.10î™ Wî™ >î™ P
cont_int
= 30î™ W
In this case, therefore, an external braking resistor is required. Select the external braking
resistor according to the following table.
Frame size Resistance (Ω) Continuous power (W) Peak power (W) Braking energy (J)
FSC (1î™ kW) ≥ 50 > 85.10 > 3404.18 > 170.21
More information
For more inf
ormation about connecting the braking resistor, see Section "Connecting the
braking resistor (Pageî™ 148)".
Technical data
14.1î™ Technical data of the converter
SINAMICS S200 PROFINET servo drive system with SIMOTICS S-1FL2
622 Operating Instructions, 11/2023, FW V6.3, A5E51646752B AB