Protecting The Motor By Calculating The Motor Temperature - Siemens SINAMICS G120 Operating Instructions Manual
Low voltage converters, chassis and wall/panel mounted devices with cu230p-2 control units
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Advanced commissioning
6.6 Protection functions
6.6.3
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 6- 34
Parameter
p0601
p0604
p0605
p0610
p0611
p0612
236
Parameters for temperature acquisition without using a temperature sensor
Description
Motor temperature sensor type (factory setting: 0)
0: No sensor
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.
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.
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).
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.
Mot_temp_mod activation
Converter with CU230P-2 Control Units
Operating Instructions, 04/2015, FW V4.7 SP3, A5E34257946B AB
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