APC Battery Charger AP9927 User Manual

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4 Wire Harness: Installation
Pre-installation Procedures
Lockout/Tagout the UPS
Before installing the wire harnesses, use lockout and tagout safety
procedures for the UPS or any attached equipment, such as high-voltage
power supplies. If possible, disconnect the main output lead from the
battery string to the load.
Determine battery
numbers
Before installing the harness wires, designate a battery number to each
battery in your system. Using a volt meter to check polarity, determine
the most positive battery in your string (Battery 1), and count to the most
negative (last) battery in your string.
Determine fuse bus and
midpoint bus
connections (Silcon only)
Locate the 1/2-fuse bus connectors and 1/2-midpoint bus connectors on
the inside roof of the cabinet.
• The positive fuse bus connectors and midpoint bus connectors are
on the right side of the cabinet.
• The negative fuse bus connectors and midpoint bus connectors are
on the left side of the cabinet.
Electrical
Hazard
Voltage is present in the battery cabinet even after
disconnecting it from the main load. Use caution when
working with the batteries.
Midpoint Bus
Fuse Bus

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