Monitoring and protective functions

8

8.1Power unit protection, general

Description

SINAMICS power units offer comprehensive functions for protecting power components.

Table 8-1

General protection for power units

 

 

 

 

 

 

 

Protection against:

 

Precautions

 

Responses

Overcurrent1)

 

Monitoring with two thresholds:

 

 

 

 

First 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

 

 

Second threshold exceeded

F30001

"Overcurrent" –> OFF2

Overvoltage1)

Comparison of DC link voltage with

F30002

"Overvoltage" –> OFF2

 

 

hardware shutdown threshold

 

 

Undervoltage1)

Comparison of DC link voltage with

F30003

"Undervoltage" –> OFF2

 

 

hardware shutdown threshold

 

 

Short-circuit1)

 

Second monitoring threshold checked

F30001

"Overcurrent" –> OFF2

 

 

 

for overcurrent

 

 

 

 

Uce monitoring of IGBT modules

F30022

"Uce monitoring" –> OFF2 (chassis only)

 

 

 

(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

 

 

F30011

"Line phase-failure in main circuit" –>

detection1)

 

 

 

OFF2

 

1) The monitoring thresholds are permanently defined in the converter and cannot be changed.

Drive Functions

291

Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4

Page 291
Image 291
Efficient Networks S120 manual Power unit protection, general, Protection against Precautions Responses, OFF2