Voltage Actual Value Sensing - Siemens SINAMICS GL150 Operating Instructions & Installation Instructions

A communication peer is required in the form of the Power Stack Adapter. The power stack
adapter supplies the optical gating pulses, and evaluates the feedback signals from the
thyristor electronics.
Mode of operation of thyristor electronics
Thyristor electronics are part of the thyristor control system. The thyristor electronics receive
the control signals from the Power Stack Adapter via fiber-optic cables.
The thyristor electronics module generates the following signals:
● Gate pulses
● Checkback signals
The Power Stack Adapter evaluates these status checkback signals from the thyristor
electronics.
With the "Thyristor in command window" status checkback signal and the synchronizing
voltage, the offset angle can be determined in a test operation.
The information that can be derived from the correlation between the command and the
generated signals includes:
1. Commutation errors
2. Bridge short-circuit
3. Inverter shoot-through
4. Misfiring
3.3.2.3

Voltage actual value sensing

The voltage actual values are measured using AVT combination modules, whose measuring
resistors are connected in series. This ensures a high degree of measuring accuracy.
SINAMICS GL150 6SL38502UM114PA0Z
Operating Instructions Rev.201910281441 EXAMPLE
Checkback signals provide thyristor status and control information. Fiber-optic cables are
also used to send these checkback signals back to the Power Stack Adapter.
Description
3.3 Power unit
35