Vertiv Liebert APS series, Installer And User Manual

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4.2.2 Low Battery Dry Contact
Pins 3 and 4: Output dry contact, normally open. When the UPS is operating on battery, the dry contact is
closed upon battery low-voltage alarm. The maximum voltage and current are 24 VDC and 0.3 A,
respectively.
4.2.3 Any Mode Shut Down
Pins 5 and 6: Input dry contact, normally open. After the external dry contact is closed (shorted), the UPS
output will be shut down during any mode of operation (mains, battery, bypass).
4.2.4 Battery Mode Shut Down
Pins 7 and 8: Input dry contact, normally open. After the external dry contact is closed (shorted), the UPS
output will be shut down only during battery mode operation.
NOTE: The default for the any-mode and battery-mode Shutdown features is "disabled." Using this
function requires setting Remote Comms shutdown to "Enabled" in the Settings on the LCD user
interface. You can also use the user-interface Settings to set the delay time for the UPS shutdown after
the dry contact is closed. Enabling the feature on the LCD enables both shutdown methods.
4.3 REPO (Remote Emergency Power Off)
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, you must tie the REPO into the breaker that feeds the UPS
source. Otherwise, voltage may be present on the output connections if the unit is in manual
bypass.
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.
The Liebert APS is equipped with a REPO connection. Only the SELV (Safety Extra Low Voltage) circuit
can be connected to the REPO terminal block. Figure 4.4 on the next page shows the schematic diagram
of REPO switch connections.
Vertiv | Liebert® APS™ Installer/User Guide | 53