Siemens SINAMICS S120 Function Manual page 869

Restoring NVRAM data
With p7775 = 2, the NVRAM data is transferred back from the memory card into the Control
Unit. When restoring you decide which data you require and want to copy.
There are two reasons that necessitate the NVRAM data to be restored.
● Replacing the Control Unit.
● Specific restoration of the NVRAM data as it is possible that there are data errors.
When restoring, the Control Unit always searches first for the "PMEMORY.ACX" file. If the
file is available with a valid checksum, then it is loaded. If a "PMEMORY.ACX" file is not
found, the Control Unit searches for a "PMEMORY.BAK" file, and if the checksum is valid
then this is loaded.
Replacing the Control Unit:
If a Control Unit has to be replaced, then this is identified by SINAMICS as a result of the
modified Control Unit serial number. After the POWER ON, the NVRAM of the Control Unit is
first deleted. The new NVRAM data is then loaded.
NVRAM restoration:
A specific restoration of the saved NVRAM data is initiated by setting p7775 = 2. The original
file in the NVRAM is first deleted. If the file "PMEMORY.ACX" is available with a valid
checksum, it is loaded to the NVRAM.
The following data is not imported again:
● Control Unit operating hours counter
● Control Unit temperature
● Safety logbook
● Crash diagnostics data
Deleting NVRAM data
With p7775 = 3, the NVRAM data is deleted.
The following data is not deleted:
● Control Unit operating hours counter
● Control Unit temperature
● Safety logbook
● Crash diagnostics data
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Basic information about the drive system
12.6 Data backup
867