Monitoring Functions And Protective Functions; Power Unit Protection; Thermal Monitoring And Overload Responses - Siemens SINAMICS S120 Function Manual

Monitoring functions and protective functions

10.1

Power unit protection

SINAMICS power units offer comprehensive functions for protecting power components.
Table 10-1 General protection for power units
Protection against: Precautions
Overcurrent Monitoring with 2 thresholds:
1)
● 1. Threshold exceeded
● 2. Threshold exceeded
Overvoltage Comparison of DC-link voltage with hardware
1)
shutdown threshold
Undervoltage Comparison of DC-link voltage with hardware
1)
shutdown threshold
Short-circuit
● 2. Monitoring threshold checked for
1)
● Uce monitoring of IGBT modules (chassis
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)
10.1.1

Thermal monitoring and overload responses

The thermal power unit monitor is responsible for identifying critical situations. If alarm
thresholds are exceeded, the user can set parameterizable response options that enable
continued operation (e.g. with reduced power) and prevent immediate shutdown. The
parameterization options, however, only enable intervention below the shutdown thresholds,
which cannot be changed by the user.
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
overcurrent
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 insula‐
tion is intact.
F30011 "Line phase-failure in main circuit" → OFF2
10
595