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The following conditions must be met simultaneously when selecting the braking resistor:
• The calculated braking energy required in the application E
braking energy E
E
E
• The braking power required in the application P
P
duration t
satisfied, you must use the external braking resistor. Select the external braking resistor with
P
• The average braking power required in the application P
cycle) must not exceed the maximum continuous power P
braking resistor, if P
(P
braking resistor. Select the external braking resistor with P
You can find the resistance data of the internal braking resistor for each frame size in the
table "Internal braking resistor of the SINAMICS S200 converter product line (PN version)" in
Section "Internal braking resistor (Page 618)".
Calculating the braking energy, the braking power, and the average braking power
• Calculate the braking energy according to the following formula:
Note
As the friction is not taken into account in the above formula, less energy is fed back to the
servo drive system in practice than that calculated in the formula.
• Calculate the braking power according to the following formula:
P
• Calculate the average braking power according to the following formula:
P
E
/ J
br
J
/ kgm
mot
J / kgm
n
/ r/min
1
n
/ r/min
2
P
/ W
br
P
/ W
avg
SINAMICS S200 PROFINET servo drive system with SIMOTICS S-1FL2
Operating Instructions, 11/2023, FW V6.3, A5E51646752B AB
. If E
max
br
, you must use the external braking resistor. Select the external braking resistor with
max_int
> E
.
max_ext
br
. When using the internal braking resistor, if P
max
. If the requirement (P
on
> P
.
max_ext
br
> P
avg
cont_int
< P
) of the specific application still can not be satisfied, you must use the external
avg
cont_int
= E
/ t
br
br
on
= E
/ T
avg
br
Application-specific braking energy
Moment of inertia of the servo motor
2
For the technical data and characteristics of the 1FL2 motors, see Section "Tech‐
nical data and characteristics of the 1FL2 (Page 644)".
2
Moment of inertia of the driven mechanical system in relation to the shaft of the
servomotor
Initial speed
Speed after braking
Application-specific braking power
Application-specific average braking power
< E
, you don't require an external braking resistor. If E
max_int
must not exceed the maximum peak power
br
< P
) of the specific application still can not be
br
max_int
, you can adjust the braking cycle duration T. If the requirement
14.1 Technical data of the converter
must not exceed the maximum
br
> P
, you can adjust the braking
br
max _int
(arithmetic mean of the braking
avg
. When using the internal
cont
> P
.
cont_ext
avg
Technical data
>
br
621
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