Siemens SINAMICS G120D - Protecting the Motor by Calculating the Motor Temperature

Setting functions
8.7 Protection and monitoring functions
Converter with control units CU250D-2
Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
215
8.7.3
Protecting the motor by calculating the motor temperature
The converter calculates the motor temperature based on a thermal motor model. Use the
parameters below to set further variables for the temperature calculation of the motor.
Table 8- 23 Parameters for temperature acquisition without using a temperature sensor
Parameter
Description
p0601
Motor temperature sensor type
(factory setting: 0)
0: No sensor
p0604
Mot_temp_mod 2/KTY Warning threshold
(factory setting: 130 °C)
Threshold for monitoring the motor temperature
.
.
After exceeding the threshold, the converter reports fault F07011.
p0605
Mot_temp_mod 1/2 Threshold
(factory setting: 145 °C)
Timer for monitoring the motor temperature in motortemperature model 2
.
.
The converter starts the timer when the temperature warning threshold is exceeded
(p0604).
p0610
Motor overtemperature response
(factory setting: 12)
Determines the behavior as soon as the motor temperature reaches the warning
threshold p0604.
0:
Warning (A07910), no fault.
1: Warning (A07910); current limit will be reduced and timer started. Shutdown
with fault (F07011).
2:
Warning (A07910); timer is started. Shutdown with fault (F07011).
12: As for 2 but the last shutdown temperature is used to calculate the motor
temperature (factory setting).
p0611
I2t motor model thermal time constant
(factory setting: 0 s)
The parameter is only effective for synchronous motors.
On selecting a motor from the motor list (p0301), the converter sets up the parameter
value automatically.
p0612
Mot_temp_mod activation
.00 1 signal: Activate motor temperature model 1 (I2t) for permanently excited
synchronous motors
.01
1 signal: Activate motor temperature model 2 for asynchronous motors
.02 1 signal: Activate motor temperature model 3 for 1FK7 encoderless
synchronous motors
.09
1 signal: Activate motor temperature model 2 expansions
p0615
Mot_temp_mod 1 (I2t) Interference threshold
(factory setting: 180 °C)
Interference threshold for monitoring the motor temperature in motortemperature
model 1.
After exceeding the interference threshold, the converter reports fault F07011.
p0621
Identification of stator resistance (Rs) when switched on again
(factory setting: 0)
The converter measures the current stator resistance and from this calculates the
current motor temperature as the start value of the thermal motor model.
0:
No Rs identification
1: Rs identification on first switching on the motor
2:
Rs identification each time the motor is switched on