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Motor components and options
4.2 Options
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
at 120 °C
4
/ Nm
1FT703☐
1.9
1FT704☐
4
1FT706☐
13
1FT708☐
22
1FT710☐
43
1FT7117
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
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)".
96
Dyn. Braking
DC current
torque
I
at 20 °C /
M
/ Nm
A
1m
1
0.3
3
0.5
8.5
0.8
11
0.9
25
1.0
J
J
=
+
Mot
Br
Opening time
Closing time
with varistor
with varistor
1)
1)
t
t
/ ms
/ ms
o
c1
50
30
70
30
100
50
200
60
300
70
Configuration Manual, 09/2018, A5E45099423B AA
Highest braking
Moment of
energy
inertia
W
J
/ J
/ kgm² •
Br
10
-4
40
0.11
150
0.36
380
1.1
1400
3.9
3380
8.6
J
:
Mot Br
S-1FT7 synchronous motors
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