Siemens SIMOTICS T-1FW3, Configuration Manual

Page: 160 / 354

Technical data and characteristics
6.1 Explanations
1FW3 complete torque motors
158
Configuration Manual, 08/2020, A5E46027705B AA
The characteristic curve is plotted for each winding version in a separate data sheet (see
Chapter "Data sheets and characteristics (Page 162)"). The speed-torque characteristics for
different converter output voltages are then assigned to each data sheet.
Note
The voltage limit characteristic of a motor with 600 rpm rated speed lies far above that of the
same motor type with 200 rpm. However, for the same torque, this motor requires a
significantly higher current.
For this reason, you should select the rated speed such that it does not lie too far above the
maximum speed required for the application.
The size (rating) of the converter module (output current) can be minimized in this fashion
Offset of the voltage limit characteristic
Note
A offset of the voltage limiting characteristic can only used in the case of approximately
linear limiting characteristic curves. The voltage limiting characteristic can be offset only if
the condition U
Mot, new
> U
iN
is fulfilled.
The induced voltage U
iN
can be taken from the motor rating plate or calculated according to
the following formula: U
iN
= k
E
∙ n
N
/ 1000
In order to identify the limits of the motor for a converter output voltage (U
Mot
) other than 380
V, 425 V, 460 V or 510 V, the relevant voltage limiting characteristic curve must be shifted
(offset) for the particular new output voltage (U
Mot, new
).
The degree of offset is obtained as follows:
For an output voltage of U
Mot, new
, an offset is obtained along the X axis (speed) by a factor of:
U
Mot, new
= new converter output voltage
U
Mot
= drive converter output voltage from the characteristic curve for
380 V, 425 V, 460 V or 510 V