Communication
41 Liebert
®
APS
™
NOTICE
Risk of improper installation. Can cause unintended UPS shutdown and loss of power to the
load.
Run signal cables separately from power cables. Running cables in the same conduit can
cause signal noise, possibly causing the system to shut down.
3.4 Long Run Time (LRT) Battery Temperature Probe Terminals
The Liebert APS contains a temperature-compensated battery charging system. To use this feature
with external LRT battery systems, Pins 13-16 of the contact terminal strip are used to connect a
temperature sensor. See Figure 49 and Table 14 for the pin definition of the temperature sensor
terminals.
Figure 49 Pin layout of the temperature sensor terminal
3.5 USB Port
The Liebert APS UPS contains a standard B type USB port on the rear of the unit to connect the UPS
to a network server or other computer for monitoring using any operating system, built-in UPS
support or in conjunction with Liebert MultiLink
®
software.
WARNING
Risk of electrical shock. Can cause property damage, injury and death.
Operating the REPO circuit will NOT trip the manual bypass breaker. If the REPO must shut
off UPS output under all circumstances, the user must tie the REPO into the breaker feeding
the UPS source. Otherwise, voltage may be present on the output connections if the unit is in
manual bypass.
NOTE
A jumper is factory-installed between Pins 9 and 10 to disable the Main Control Switch. This
will prevent the UPS from being started accidentally during shipment and installation. This
jumper must be removed before the unit can be started.
If the installation does not require connection to a REPO system, the factory-installed jumper
must be removed.
Table 14 Pin definition of the temperature sensor terminal
Position Name Description
13 Inside Battery Temperature Locate battery temperature signal close to the UPS
14 Battery Temperature +12V Battery temperature signal power supply
15 Outside Battery Temperature Locate battery temperature signal at UPS remote end
16 GND GND
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