Mounting and options
3.7 Cooling
SIMOTICS S-1FT2 synchronous motors for SINAMICS S120
40
Operating Instructions, 07/2021, A5E50610821B AB
Table 3- 1
The 1FT2 can be supplied with the following encoders:
Absolute
encoder, single-
turn, 22-bit
Absolute
encoder 22-bit +
12-bit multiturn
Absolute
encoder, single-
turn, 26-bit
Absolute
encoder 26-bit +
12-bit multiturn
Encoder designation
AS22DQ
AM22DQ
AS26DQC
AM26DQC
Description
Absolute
encoder 22-bit
singleturn
Absolute encoder
22-bit + 12-bit
multiturn
Absolute
encoder 26-bit
singleturn
Absolute encoder
26-bit + 12-bit
multiturn
Identifier at the 14th digit
of the article number
S
M
B
C
Operating voltage
24 V
24 V
24 V
24 V
Maximum current
consumption
70 mA
70 mA
70 mA
70 mA
Resolution
4,194,304 =
22-bit
4,194,304 =
22-bit
67,108,864 =
26-bit
67,108,864 =
26-bit
Absolute position
Yes, one
revolution
Yes,
4096 revolutions
(12-bit)
Yes, one
revolution
Yes, 4096
revolutions
(12-bit)
Angular error
± 100 "
± 100 "
± 40 "
± 40 "
3.7
Cooling
The motor is naturally cooled. The power loss is dissipated through thermal conduction of the
flange, thermal radiation and natural convection.
Note the specifications on thermally non-insulated mounting and on thermally insulated
mounting.
You will find information on this in the relevant configuration manual.
3.8
Holding brake
The type of holding brake installed depends on the size of the motor.
Type of the holding brake
Spring-loaded brake
Permanent-magnet brake
installed in the motors
1FT2☐03 ... 1FT2☐04
1FT2☐05 ... 1FT2☐10
Method of operation
The spring exerts a tensile force
on the brake armature disk. This
means that in the no-current
condition, the brake is closed
and the motor shaft is held.
When 24 V DC rated voltage is
applied to the brake, the cur-
rent-carrying coil produces an
opposing field. This neutralizes
the force of the spring and the
brake opens without any
residual torque.
The spring-loaded brake has a
torsional backlash less than 1°.
The magnetic field of the permanent
magnets exerts a pulling force on the
brake armature disk. This means that
in the no-current condition, the brake
is closed and the motor shaft is held.
When 24 V DC rated voltage is applied
to the brake, the current-carrying coil
produces an opposing field. This
neutralizes the force of the
permanent magnets and the brake
opens without any residual torque.
The permanent magnet brake has a
torsionally stiff connection to the
motor rotor.
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