Siemens SIMOCODE pro Operating Manual

Parameters
4.1 Motor protection
SIMOCODE pro - Parameterize
50 Operating Manual, 04/2017, A5E40507630002A/RS-AA/001
4.1.5
Thermistor protection
Description
Thermistor protection is based on a direct temperature measurement in the motor via binary
PTC thermistors which can be connected to the SIMOCODE pro basic unit.
Thermistor protection is used in the case of:
● Motors with high switching frequencies
● Converter operation
● Motors with heavy starting
● Intermittent duty and/or braking operation
● Restricted air supply
● Speeds below the rated speed.
In this case, the sensors are mounted in the winding slot or bearing of the motor.
Schematic and characteristic curve
The resistance of the thermistors increases rapidly (abruptly) when the temperature limit is
reached.
Figure 4-7 Thermistor function block (thermistor protection)

Siemens SIMOCODE pro Specifications

General

Protection Class	IP20
Mounting Type	DIN rail mounting
Rated Operational Voltage	24 V DC
Rated Current	Up to 820 A
Protection Functions	Overload, short-circuit, phase failure, asymmetry, ground fault, motor stall
Operating Temperature Range	-25°C to +60°C
Communication Protocols	PROFIBUS DP, PROFINET, Modbus RTU
Analog Outputs	Up to 2
Temperature Monitoring	PTC/KTY, RTD (PT100/PT1000)
Digital Outputs	Relay outputs, Solid-state outputs
Analog Inputs	0/4-20mA, PT100/PT1000