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09.00
Warning
!
Under fault conditions, the motor can accelerate to n
data), and for higher supply or DC link voltages, this speed can be significantly
exceeded. Only the dynamic torque, limited by the voltage limiting characteri-
stic, can occur.
Thermal limiting
Corresponds in the diagrams to the S1 (100 K) characteristic. The arithmetic
characteristic
average may not be exceeded, even in intermittent duty.
Fig. 1-3
Voltage limiting
The motor EMF increases proportionally with increasing speed. Only the diffe-
characteristics
rence between the DC link voltage and the increasing motor EMF is available to
impress the current. This limits the magnitude of the current which can be im-
pressed at high speeds
Warning
!
It is not permissible for the motor to be continuously operated at the voltage
limiting characteristic in the range above the S1 characteristic for thermal
reasons.
The voltage limiting characteristics of a motor with a rated speed of 6000 RPM
lies far above that of the same motor type with 2000 RPM. However, this motor
requires a significantly higher current for the same torque. Thus, it is practical to
select the rated speed, so that this does not lie too far above the required maxi-
mum speed for the particular application. This allows the rating of the drive con-
verter module (current rating) to be minimized.
The voltage limiting characteristics are valid for
1FT5/1FT6/1FK6
Siemens AG 2000 All rights reserved
SIMODRIVE Planning Guide Motors (PJM) – 11.00 Edition
25 %
S3–25 %
Load duty cycle 10 min
The power–on duration is acc. VDE 0530, normalized for 15 %, 25 %, 40 %, 60 %.
If a duty cycle is not specified, it is 10 min.
Power–on duration in intermittent duty
6SN1197–0AA20
General Information on AC Servomotors
1.1 Definitions
(acc. to the technical
max
for 600 V.
ALS
t
ALS/1-5
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