Converter Protection Using Temperature Monitoring - Siemens SINAMICS G115D Operating Instructions Manual

Advanced commissioning

6.20 Converter protection using temperature monitoring

Parameters
The factory setting for proportional gain and the integral time of the I_max controller ensures
faultless operation in the vast majority of cases.
The factory setting of the I_max controller must only be changed in the following exceptional
cases:
• Speed or torque of the motor tend to cause vibrations upon reaching the current limit.
• The converter goes into the fault state with an overcurrent message.
Parameter
r0056.0 ... 15 CO/BO: Status word, closed-loop
p0305[0...n]
p0640[0...n]
p1340[0...n]
p1341[D]
r1343
You will find more information about this function in function diagram 6300 and in the
parameter list.
6.20 Converter protection using temperature monitoring
Overview
The converter temperature is essentially defined by the following effects:
• The ambient temperature
• The ohmic losses increasing with the output current
• Switching losses increasing with the pulse frequency
Monitoring types
The converter monitors its temperature using the following monitoring types:
• I
• Measuring the chip temperature of the converter (alarm A05006, fault F30024)
• Measuring the heat sink temperature of the converter (alarm A05000, fault F30004)
256
Description
control
Rated motor current [A]
Current limit [A]
I_max frequency controller pro-
portional gain
I_max frequency controller inte-
gral time [s]
CO: I_max controller frequency
output [rpm]
t monitoring (alarm A07805, fault F30005)
2
Setting
Display and BICO output for the status word of
the closed-loop control.
Sets the rated motor current.
Factory setting: 0
Sets the current limit.
Sets the proportional gain of the I_max frequency
controller.
Factory setting: 0
Sets the integral time for the I_max frequency
controller.
Factory setting: 0.3
Displays the effective frequency limit.
Operating Instructions, 09/2020, FW V4.7 SP13, A5E48681219B
SINAMICS G115D distributed drive