Monitoring And Protective Functions; Power Unit Protection, General - Siemens SINAMICS S120 Function Manual

Monitoring and protective functions

9.1

Power unit protection, general

SINAMICS power units offer comprehensive functions for protecting power components.
Table 9- 1 General protection for power units
Protection against: Precautions
Overcurrent Monitoring with 2 thresholds:
1)
•
•
Overvoltage Comparison of DC-link voltage with hardware
1)
shutdown threshold
Undervoltage Comparison of DC-link voltage with hardware
1)
shutdown threshold
Short-circuit
1)
•
•
Ground fault Monitoring the sum of all phase currents
Line phase-failure
detection
1)
The monitoring thresholds are permanently defined in the converter and cannot be changed.
1)
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
1. Threshold exceeded
2. Threshold exceeded
2. Monitoring threshold checked for
overcurrent
Uce monitoring of IGBT modules
(chassis only)
Responses
A30031, A30032, A30033
Current limiting of a phase has responded.
The pulsing in the phase involved is inhibited.
If it is too frequently exceeded
F30017 –> OFF2
F30001 "Overcurrent" → OFF2
F30002 "Overvoltage" → OFF2
F30003 "Undervoltage" → OFF2
F30001 "Overcurrent" → OFF2
F30022 "Uce monitoring" → OFF2 (chassis only)
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.
F30011 "Line phase-failure in main circuit" → OFF2
9
547