Siemens 1FW6092-2PC15-6AB3, Configuration Manual

Page: 111 / 300

Configuration
5.4 Mounting
1FW6 High Speed built-in torque motors
Configuration Manual, 01/2020, 6SN1197-0AE03-0BP3
109
Periodic duty cycle (S3 mode)
The motor can repeat a drive operation any number of times (e.g. the positioning operation
described above), in which M > M
N
intermittently occurs, if there are sufficiently long intervals
in which the windings are de-energized between the load phases. Also see Section
"Intermittent duty S3" in Chapter "Specification of the duty cycle."
The "duty cycle" comprises the load phase and the zero-current (cooling) phase. The cooling
phases are crucial here: As a result of the no-load intervals, the effective torque of the duty
cycle is reduced to the value of the rated torque M
N
of the motor.
If the future duty cycle is either not known or cannot be estimated, the motor can only be
selected on the basis of the required maximum speed and peak torque. This means that for
the duty cycle, the maximum permissible rms torque M
eff
of the duty cycle is also defined.
This results in a very short cooling phase, the length of which must not be undershot.
A significantly simplified load cycle comprising three time segments with lengths
Δ t
1
, Δ t
2
, Δ t
3
is assumed by way of example. In these time segments, torques M
1
, M
2
, M
3
are produced.
Each of these torques can have any value b M
MAX
and – M
MAX
. The effective torque
M
eff
of this load cycle in Nm can be calculated using the following formula:
In this case, the cycle duration ( Δ t
1
+ Δ t
2
+ Δ t
3
) should not be longer than 10% of the thermal
time constant t
TH
.
The load cycle is permissible, as long as M
eff
≤ M
N
.
5.4 Mounting
5.4.1 Safety instructions for mounting
WARNING
Risk of death and crushing as a result of permanent magnet fields
Severe injury and material damage can result if you do not take into consideration the
safety instructions relating to permanent magnet fields.
•
Observe the information in Chapter "Danger from strong magnetic fields (Page 32)".
Installing torque motors involves carrying out work in the vicinity of unpacked rotors.
The resulting danger from strong magnetic fields is, therefore, particularly high.