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

Advanced commissioning
7.7 Protection functions
Converter with control units CU250D-2
232 Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB
7.7.3
Protecting the motor by calculating the motor temperature
The converter calculates the motor temperature based on a thermal motor model.
Requirements
The inverter can only calculate a realistic motor temperature if the following requirements are
met:
● Perform basic commissioning
● In the basic commissioning, set the motor data via the motor code, the motor Article No.,
or according to the motor nameplate.
● Check the value of the motor mass (P0344). The inverter calculates the p0344 based on
the basic commissioning.
Settings
Table 7- 24 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)
Threshold for monitoring the motor temperature with motor temperature model 1, 2, or
KTY
.
Motor temperature model 1 (p0612.0 = 1): Alarm threshold - If the alarm threshold is
exceeded, the inverter reports alarm A07012.
Motor temperature model 2 (p0612.1 = 1) or KTY: Fault threshold - If the fault thresh-
old is exceeded, the inverter reports fault F07011.
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.