100 Maintenance
PPCS branching unit (APBU-xx)
Replacing the memory backup battery
WARNING! Read and follow the instructions in chapter Safety instructions.
Ignoring the instructions can cause physical injury or death, or damage to the
equipment.
1. Ensure that the converter is disconnected from the power supply network and all other
precautions described in section Safety in installation and maintenance, page 12 have
been taken into consideration.
2. Disconnect the 230 V AC (115 V AC) supply cables from connectors X1 and X2 at the
right-hand side of the cabinet.
3. The APBU unit(s) are located in the auxiliary control cubicle (see page 33). The grid-
side converter APBU unit is located under the RDCU unit. Open the screws on the unit
cover (3 pcs).
4. Slide off the cover.
5. Remove the battery.
6. Insert new CR 2032 battery and reattach the cover. Connect the cables in reverse
order.
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