Functions, monitoring, and protective functions
9.4 Monitoring and protective functions
Inverter chassis units
476 Operating Instructions, 07/2016, A5E00331449A
Monitoring and protective functions
9.4.1
Protecting power components
Description
SINAMICS power modules offer comprehensive protection of power components.
Table 9- 12 General protection for power units
Overcurrent
1)
Monitoring with two thresholds:
• First threshold exceeded
A30031, A30032, A30033
Current limiting in phase U has responded.
Pulsing in this phase is inhibited for one pulse peri-
od.
F30017 -> OFF2 is triggered if the threshold is ex-
ceeded too often.
• Second threshold exceeded
F30001 "Overcurrent" -> OFF2
DC link overvoltage
1)
Comparison of DC link voltage with
hardware shutdown threshold
F30002 "Overvoltage" -> OFF2
DC link undervoltage
1)
Comparison of DC link voltage with
hardware shutdown threshold
F30003 "Undervoltage" -> OFF2
Short-circuit
1)
Second monitoring threshold checked
for overcurrent
Uce monitoring for IGBT module
F30001 "Overcurrent" -> OFF2
F30022 "Monitoring Uce" -> OFF2
Ground fault Monitoring the sum of all phase cur-
rents
After threshold in p0287 is exceeded:
F30021 "power unit: Ground fault" -> OFF2
Note:
The sum of all phase currents is displayed in
r0069[6]. For operation, the value in p0287[1] must
be greater than the sum of the phase currents when
the insulation is intact.
Line phase-failure detec-
1)
F30011 "Line phase-failure in main circuit" -> OFF2
1)
The monitoring thresholds are permanently set in the converter and cannot be changed by the user.
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