Siemens SIMOTICS S-1FT7 User Manual

Motor components and options
4.2 Options
S-1FT7 synchronous motors
Configuration Manual, 09/2018, A5E45099423B AA
75
J
Load
/ kgm
2
Load moment of inertia of the mounted part at the motor with brake is a
s-
sumed 3
x motor rotor moment of inertia with brake (kgm
2
) → see Chapter
"Data sheets and characteristics (Page 150)"
182.4
Constant to calculate the angular frequency and SI units
Example for calculating the highest braking energy for braking the 1FT7062-5AF7□-□□□□
from 3000 rpm with three times the rotor moment of inertia as load moment of inertia:
W
BR
= ( J
Mot Br
+ J
Last
) • n
Mot
² / 182.4
W
BR
= (1.02 • 10
-3
+ 3 • 1.02 • 10
-3
) • 9 • 10
6
s
-2
• kgm
2
/ 182.4
W
BR
= 4.08 kgm
2
• 9000 s
-2
/ 184.2
W
BR
= 201.13 J
W
BR
= 201.13 J < 880 J → W
Br
= ok
880 J is the highest braking energy for this brake. See "Technical specifications (Page 76)"
● The holding brake opens so that it has no residual torque.
● The rated voltage of the holding brake is 24 V DC, with a permissible tolerance range of
± 10 %, measured at the motor connector. Take into account the voltage drop along the
supply cable, see Chapter "Connecting the holding brake (Page 387)".
WARNING
Inadvertent motion as a result of reduced braking effect
If you use the holding brake incorrectly, e.g. as safety brake, or you do not comply with the
number of permissible brake closing operations, then the effect of the holding brake can be
irreversibly reduced. This can result in inadvertent motion of your machine or system - and
in turn can cause death or severe injury.
• Comply with the permissible number of EMERGENCY STOP braking operations with
the specified highest braking energy.
• Avoid that the motor repeatedly and briefly accelerates with the brake still closed.
• Take into account the brake switching times and relay switching times for the brake
control and/or release.
• Only operate the motor with an intact brake that is operating perfectly.
Note
Motors with or without
holding brake cannot be subsequently retrofitted.
Motors with holding brake are longer by the installation space required (see the dimension
drawings).
Note
It is not permissible that motors with integrated permanent magnet excited holding brake are
su
bject to axial forces.

Siemens SIMOTICS S-1FT7 Specifications

General

Brand	Siemens
Model	SIMOTICS S-1FT7
Category	Engine
Language	English