Basic Information about the Drive System
Monitoring and protective functions
7-262
E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
7.9 Monitoring and protective functions
7.9.1 Protecting power components: general
Description
SINAMICS power sections offer comprehensive functions for protecting power
components.
Table 7-13 General protection for power sections
Protection against
Protective measures Responses
Overcurrent
1)
Monitoring with two thresholds:
S First threshold exceeded
S Second threshold exceeded
A30031, A30032, A30033
Current limitation of phase
activated.
Pulsing in the phase in question is
inhibited for one pulse period.
F30017 –> OFF2 is triggered if the
threshold is exceeded too often.
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)
S Second monitoring threshold
checked for overcurrent
S Uce monitoring for IGBT module
(chassis only)
F30001 “Overcurrent” –> OFF2
F30022 “Monitoring Uce” –> OFF2
(chassis only)
Ground fault Monitoring the sum of all phase
currents
After threshold in p0287 is
exceeded:
F30021 “Power section: 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 defined permanently in the converter and cannot be changed.
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