Siemens SIMOTICS Series Hardware Installation Manual

Motor components, characteristics and options
4.1 Thermal motor protection
SIMOTICS M-1FE2 built-in motors
58 Hardware Installation Manual, 04/2020, A5E50074509B AA
4.1.1 Thermal motor protection with temperature sensors (standard protection)
The stator laminated core has 2 Pt1000 temperature sensors to monitor the winding
temperature; one of these is a reserve.
Note
When the motor is
operated at its rated power, the winding temperature can reach approx.
150
°C.
The winding has thermal class 155 (F) and is dimensioned for this operating state.
The type of temperature sensor installed is stamped on the rating plate.
The temperature sensor protects the motor from overload when operational.
The temperature sensor detects the motor temperature. The drive system evaluates the
motor temperature. An external tripping unit is not required. The PTC thermistor function is
monitored.
1. Pre-alarm temperature (default setting for the 1FE2)
If the pre-alarm temperature of 150 °C is exceeded, the drive system issues an
appropriate alarm signal. This alarm signal must be evaluated externally.
The alarm signal is cleared when the motor temperature decreases to below the pre-
alarm temperature.
If the pre-alarm temperature is exceeded for longer than 240 seconds (standard setting)
or longer than the parameterized time, then an alarm signal is issued and the drive is shut
down.
A detailed description is provided in the SINAMICS S120/S150 List Manual.
SINAMICS S120_150 List Manual
(
https://support.industry.siemens.com/cs/products?search=Listenhandbuch&dtp=Manual
&mfn=ps&o=DefaultRankingDesc&pnid=13204&lc=de-WW)
2. Motor limit temperature (standard setting for the 1FE2)
If the motor temperature limit of 160 °C ±5 °C is exceeded, the drive system is shut down
and it issues an appropriate fault signal.
Table 4- 1 Features and technical specifications
Type
Pt1000
Resistance when cold (20 °C)
Approx. 1090 Ω
Resistance when hot (100 °C)
Approx. 1390 Ω
Connection
Via signal cable
Response temperature (standard setting for
SINAMICS S120)
Pre-alarm at 150 °C
Trip/shutdown at 160 °C ±5 °C
The resistance change is proportional to the winding temperature change. The temperature
characteristic is taken into account in the closed-loop control.
The following diagram shows the resistance characteristic as a function of the temperature
for Pt1000 temperature sensors.

Siemens SIMOTICS Series Specifications

General

Brand	Siemens
Model	SIMOTICS Series
Category	Engine
Language	English