Siemens SIMOTICS 1FT2104-4AF - Page 74

Technical data and characteristics
6.1 Explanations
1FT2 synchronous motors for SINAMICS S120
72 Configuration Manual, 03/2021, A5E50645584B AA
NOTICE
Motor damage due to overheating
Continuous operation in the area above the S1 characteristic results in motor overheating
and subsequent damage.
•
Operate the motor within the values of the S1 characteristic.
Mmax characteristic
The M
max characteristic ② defines the operating range for transient overloads.
M
max inv characteristic
The M
max inv characteristic ③ limits the possible overload range in combination with a specific
maximum converter current. The M
max inv characteristic takes field weakening into
consideration.
n
max inv line
The mechanical variables of the motor and the properties of the converter limit the speed
range of the motor. The n
max inv line ④ limits the maximum permitted speed of the motor in a
drive system with SINAMICS S120.
NOTICE
Damage to the converter due to excessively high speeds
A motor speed higher than n
max inv can result in a voltage being induced in the winding that
exceeds the maximum permissible voltage at the converter. This induced voltage can
destroy the converter.
•
Operate the motor at speeds below n
max inv
.
Voltage limit characteristic curve
Field weakening starts from the voltage limit characteristic ⑤.
As the speed increases, an increasing percentage of the current is used for field weakening,
and therefore no longer generates a torque. This is the reason that the M
max characteristic
and the S1 characteristic have a steep downward gradient in the field weakening range.
Converter output voltages
Every speed-torque diagram includes different characteristics for different converter output
voltages.
Drive system Infeed module Line voltage DC link voltage Output volt-
age
U line
UDC LINK
Umot
SINAMICS S120
3 AC 380 V to 480 V
ALM
ALM
BLM/SLM
BLM/SLM
400 V
480 V
400 V
480 V
600 V
720 V
540 V
650 V
425 V
510 V
380 V
460 V