Operating instructions

Operation
3.2 Start-up Behavior
Control Units CU240S
Operating Instructions (Compact), 04/2006, A5E00766042B AA
3-7
PM hotswap with powered CU
Caution
Before performing a hotswap, make sure that all parameters are stored in the EEPROM of
the Control Unit (see P0014 or P0971).
In this case the power module can be hot swapped without power cycling the CU. A
parameter set either from MMC or from CU EEPROM is loaded into the CU RAM to prevent
faults.
A successful swap is indicated by F0395, a swap fault by F0061 or F0063. See description
below.
CU swap
A CU swap always results in a power cycle of the CU. This causes a demand for loading a
parameter set either from MMC or from CU EEPROM into the CU RAM. If an MMC with a
valid parameter set is plugged, the CU loads the parameter set from the MMC, if no MMC is
plugged, the parameter set from the CU EEPROM is loaded.
A successful swap is indicated by F0395, a swap fault by F0061 or F0063. See description
below.
Caution
Before snap-on the Control Unit to the Power Module while hot swap connect 24 V supply to
the terminals.
Warning
When carrying out a CU swap it is not allowed to replace a CU with fail-safe functions with a
CU without fail-safe functions. Replacing a CU with fail-safe functions with a CU without fail-
safe functions disables all potentially implemented fail-safe functions and therefore can lead
to personal injury and damage to the machine.
A replacement of CU with fail-safe functions with a CU without fail-safe functions has to be
assumed as completely new application.