Siemens SIMOTICS S-1FT7 User Manual

Motor components and options
4.2 Options
S-1FT7 synchronous motors
96 Configuration Manual, 09/2018, A5E45099423B AA
4.2.4.8
Option N27 - Brake with low moment of inertia
The option "Brake with low moment of inertia" is available for all 1FT7 motors except
1FT713☐. The brake has a lower moment of inertia than the standard brake.
For the brake with low moment of inertia, the description and characteristics of the holding
brake according to chapter "Holding brake (Page 74)" apply, with the exception of the
technical specifications.
The following technical specifications apply to the brake with low moment of inertia, deviating
from the standard version.
Table 4- 8 Technical specifications of the holding brake with low moment of inertia
Motor type
Holding
torque
M
4
at 120 °C
/ Nm
Dyn. Braking
torque
M
1m
/ Nm
DC current
I at 20 °C /
A
Opening time
with varistor
1)
t
o
/ ms
Closing time
with varistor
1)
t
c1
/ ms
Highest braking
energy
W / J
Moment of
inertia
J
Br
/ kgm² •
10
-4
1FT703☐
1.9
1
0.3
50
30
40
0.11
1FT704☐
4
3
0.5
70
30
150
0.36
1FT706☐
13
8.5
0.8
100
50
380
1.1
1FT708☐ 22 11 0.9 200 60 1400 3.9
1FT710☐
1FT7117
43 25 1.0 300 70 3380 8.6
1) Measured at 24.0 V.
Calculating the motor moment of inertia with brake
Use the following formula to calculate the motor moment of inertia with brake J
Mot Br
:
J
Mot Br
= J
Mot
+ J
Br
Electrical connection of the brake with low moment of inertia
The brake with low moment of inertia is connected like a standard holding brake.
Information on the electrical connection of the holding brake is provided in Chapter
"Connecting the holding brake (Page 387)".

Siemens SIMOTICS S-1FT7 Specifications

General

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