Siemens SINAMICS S120 - 9 Monitoring Functions and Protective Functions; Power Unit Protection, General

Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
635
Monitoring functions and protective functions
9
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
Responses
Overcurrent
1)
Monitoring with 2 thresholds:
• 1. Threshold exceeded
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
• 2. Threshold exceeded
F30001 "Overcurrent" → OFF2
Overvoltage
1)
Comparison of DC-link voltage with hardware
shutdown threshold
F30002 "Overvoltage" → OFF2
Undervoltage
1)
Comparison of DC-link voltage with hardware
shutdown threshold
F30003 "Undervoltage" → OFF2
Short-circuit
1)
• 2. Monitoring threshold checked for
overcurrent
F30001 "Overcurrent" → OFF2
• Uce monitoring of IGBT modules
(chassis only)
F30022 "Uce monitoring" → OFF2 (chassis only)
Ground fault Monitoring the sum of all phase currents 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
detection
1)
F30011 "Line phase-failure in main circuit" → OFF2
1)
The monitoring thresholds are permanently defined in the converter and cannot be changed.