PowerWalker VFI 6000LE Plus - Manual (Page 19)

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Make sure a DC breaker or other protection device between UPS and
external battery pack is installed. If not, please install it carefully. Switch
off the battery breaker before installation.
Pay highly attention to the rating battery voltage marked on the rear
panel, the connection with wrong battery voltage may cause
permanent damage of the UPS. Make sure the voltage of the
battery pack is correct.
Pay highly attention to the polarity marking on external battery
terminal block, and make sure the correct battery polarity is
connected. Wrong connection may cause permanent damage of the
UPS.
Make sure the battery input wiring is correct before power on. The
wire current spec, color, position, connection and conductance
reliability should be checked carefully. Make sure the +/- polarity is
correct, not reverse, no short circuit.
Make sure the protective earth ground wiring is correct. The wire
current spec, color, position, connection and conductance reliability
should be checked carefully.
Make sure the mains input & output wiring is correct. The wire
current spec, color, position, connection and conductance reliability
should be checked carefully. Make sure the L/N site is correct, not
reverse, no short circuit.
Install the terminal block cover on the rear panel of the UPS.
2.4 Installation for communication software (optional)
1) Connect the communication cable between UPS and PC. If the
port is RS232, please lock the secure screw both on UPS and PC
after connection. If the port is USB, it has Plug and Play function.
2) Please refer to the guide manual of software or contact the
service center for installation and operation of management
(monitoring) software.