Siemens SINAMICS MV, Function Manual

Page: 11 / 26

Description
3
When the "Two-channel firing pulse inhibit" function is selected, the following points apply:
• The optical pulse transmission to the PSA to control the firing pulses on the thyristor gating
module is switched off.
• The Motor Module and the motor are not electrically isolated.
Note
Active loads
Using the function, drive systems with active loads cannot be protected against restarting
due to an external energy supply. Take into account this residual risk when designing your
machine and where necessary apply suitable countermeasures, mechanical brakes for
example.
3.1 Structure
The structure of the "Two-channel firing pulse inhibit" function is shown in the following diagram
(‒)
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4
Figure 3-1 Overview of the main components
Two-channel firing pulse inhibit
Function Manual, 07/2021, A5E51227986A
9