Protection Functions; Inverter Temperature Monitoring - Siemens Sinamics G120P Operating Instructions Manual

Functions

7.6 Protection functions

5. Accelerate the motor to the maximum speed with maximum load and check as to whether
the motor follows the setpoint.
6. If, when accelerating, the motor stalls, increase the voltage boost p1311 until the motor
accelerates to the maximum speed without any problems.
To achieve satisfactory motor behavior, you must increase the parameter p1312 only in
applications with a significant breakaway torque.
You will find more information about this function in the parameter list and in function
diagram 6300 of the List Manual.
Parameter
p1310
p1311
p1312
7.6 Protection functions
The frequency inverter offers protective functions against overtemperature and overcurrent
for both the frequency inverter and the motor. Further, the frequency inverter protects itself
against an excessively high DC-link voltage when the motor is regenerating. In addition, the
inverter can use the kinetic energy of the motor to prevent a reduction of the DC-link voltage
in the event of a brief power failure.
7.6.1

Inverter temperature monitoring

The inverter protects itself against overtemperature with different monitoring functions:
● I
The I
Parameter r0036 [%] displays the actual utilization as a percentage value. As long as the
actual current does not exceed the reference value, then the utilization in r0036 = 0.
● Inverter monitoring (alarm A05000, fault F30004)
The inverter monitors the module sensor temperatures of the Power Module. The values
are in r0037[0] [°C].
● Monitoring the barrier junction temperatures of the Power Unit (alarm A05006, fault
F30024)
The inverter calculates the difference in temperature between the chip (IGBT) and the
module sensor. Together with the measured module sensor temperatures, this produces
the chip temperatures. The values are in r0037[1] [°C].
364
Description
Permanent voltage boost (factory setting 50%)
Compensates voltage drops as a result of long motor cables and the ohmic losses in
the motor.
Voltage boost when accelerating (factory setting 0%)
Provides additional torque when the motor accelerates.
Voltage boost when starting (factory setting 0%)
Provides additional torque, however, only when the motor accelerates for the first time
after it has been switched on ("break loose torque").
t monitoring (alarm A07805, fault F30005)
2
t monitoring measures the actual utilization on the basis of a current reference value.
2
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A