ABB CPS6000 Product Manual page 130

Reverse Battery Protection
This feature prevents closure of the LVD contactors if the QS872A detects the battery strings are
connected in reverse polarity.
Note that the system will prevent contactor closure only if it detects improper polarity. If no batteries
are connected to the system and the CPS6000 system is powered up, the QS872A will close the
contactors and present the output bus voltage at the battery terminals.
If an external disconnect switch is being used to take battery strings off-line for replacement, care
must be taken to ensure battery connections are correct at the switch. This is because the contactors
remain closed when an external disconnect switch is used to disconnect the batteries from the bus. If
the batteries are reconnected in reverse polarity, closing the switch will result in the batteries being
connected to the bus in reverse polarity.
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