Siemens SIMOTICS S-1FT7 - Page 130

Configuration
5.4 Brake resistances (armature short-circuit braking)
S-1FT7 synchronous motors
128 Configuration Manual, 09/2018, A5E45099423B AA
1FT7 High Dynamic, natural cooling
Table 5- 6 Armature short-circuit braking with/without external braking resistors
Motor type
External brak-
ing resistor
R
opt
/ Ω
Average braking torque M
Br rms
/
Nm
Max. braking
torque M
Br max
/
Nm
rms braking current I
br rms
[A]
Without external
braking resistor
With external
braking resis-
tor
Without exter-
nal braking
resistor
With external
braking resis-
tor
1FT7087-7AF7
1.2
7
26
32
51
45
1FT7117-7AC7
1.4
27
86
107
69
62
1FT7117-7AF7 1.0 21 88 110 104 93
1FT7 High Dynamic, forced ventilation
Table 5- 7 Armature short-circuit braking with/without external braking resistors
Motor type
External brak-
ing resistor
R
opt
/ Ω
Average braking torque M
Br rms
/
Nm
Max. braking
torque M
Br max
/
Nm
rms braking current I
br rms
[A]
Without external
braking resistor
With external
braking resis-
tor
Without exter-
nal braking
resistor
With external
braking resis-
tor
1FT7065-7SF7 3.4 4 8 10 17 15
1FT7065-7SH7
2.9
2
8
10
23
21
1FT7067-7SF7
2.4
5
11
14
24
21
1FT7067-7SH7
2.3
4
11
14
30
27
1FT7085-7SF7
1.8
4
18
22
34
31
1FT7085-7SH7
1.5
4
17
22
47
42
1FT7087-7SF7
1.2
7
26
32
51
45
1FT7087-7SH7
1.5
5
25
31
55
49
1FT7117-7SC7
1.4
27
86
107
69
62
1FT7117-7SF7
1.0
21
88
110
104
93