Siemens SIMOTICS S-1FT7 - Page 70

Motor components and options
4.1 Motor components
S-1FT7 synchronous motors
68 Configuration Manual, 09/2018, A5E45099423B AA
Table 4- 1 Features and technical specifications
Type
Pt1000
Not an ESD component
Resistance when cold (20 °C) Approx. 1090 Ω
Resistance when hot (100 °C)
Approx. 1390 Ω
Connection Via signal cable
Response temperature Prewarning < 135 °C
Alarm / shutdown at max. 145 °C
The following figure shows the resistance curve as a function of the temperature for the
Pt1000 temperature sensor.
Figure 4-1 Characteristic Pt1000
The winding temperature is evaluated in the converter. When a fault occurs, an appropriate
message is output at the converter. When the motor temperature increases, a message
"Alarm motor overtemperature" is output. The message can be evaluated externally.
If this message is ignored, the converter shuts down with the appropriate fault message after
a preset time period or when the motor limiting temperature or the shutdown temperature is
exceeded.
The integrated temperature sensor protects the synchronous motors only to a certain extent
against overloads:
Shaft heights 36 and 48: up to 2
•
I
0 (60 K)
and speed ≠ 0
from SH 63: up to 3
•
I
0 (60 K)
and speed ≠ 0
NOTICE
Destruction of the motor for a thermal critical load
For load applications that are critical from a thermal perspective, e.g. overload when the
motor is stationary or an overload of M
max
longer than 4 s, adequate protection is no longer
available.
• Activate the "Thermal motor model i
2
t monitoring" function in the converter.