Start-Up Behavior; Normal Start-Up Behavior Of The Inverter - Siemens SINAMICS G120 Operating Instructions Manual

Operation

6.3 Start-up Behavior

6.3 Start-up Behavior
Overview
When starting-up the inverter checks, whether an MMC is plugged in or not.
If it is plugged and no swap has been taken place the start-up runs according the "Normal
start-up behavior". If a component (CU or PM) has been replaced, this is called a swap and
the start-up will be performed according the "Swap behavior" of the inverter.
6.3.1

Normal Start-up behavior of the Inverter

Description
A normal start-up is a start-up after a power-cycle or a black-out. It can be performed with or
without MMC.
Normal start-up behavior without MMC
After a power-cycle or a black-out the inverter reads the parameters from EEPROM to RAM.
Normal start-up behavior with MMC
The CUs have been designed to detect automatically whether an MMC is present in the CU.
The interaction between the CU and the MMC is controlled using parameter P8458.
The possible settings for P8458 and their functions are given below.
P8458 = 0: No automatic parameter download from the MMC.
P8458 = 1: Automatic parameter download from the MMC only once (at the next start-up
P8458 = 2: Automatic parameter download from the MMC (if present) after each start-up
On completion of the automatic download parameter P8458 will be set to 0 - if it was 1
before download - to prohibit any further automatic download of parameters. In this case the
MMC can be withdrawn after an automatic parameter download. For details to P8458
settings refer to "Upload and download of parameter sets" in this section.
If parameter P8458 is set to 1 or 2 and no MMC is present the inverter starts with the
parameters of the EEPROM without alarm or fault message.
6-6
of the CU (default setting)). After the download P8458 is set to 0.
of the control unit.
Operating Instructions, 11/2006, A5E00766042B AA
Control Units CU240S