User Manual

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Installation
NOTE: Verify that the total equipment ratings do not exceed the UPS capacity to prevent an overload alarm.
Connecting the EBM to the UPS
If you are installing an optional EBM, refer to the Dell Online Rack EBM 10 kW Getting Started Guide
for installation instructions.
CAUTION:
If installing an optional EBM, the EBM must be located below the UPS with no U space between
the UPS and EBM. This provides better weight distribution in the rack, easier access to the UPS control panel,
and easier routing for the battery cable connections. This also prevents strain between the EBM cord and the
UPS connection and possible connection failure.
CAUTION: If the UPS is stored or used without an EBM, the battery connector cover on the rear panel of the
UPS must be installed as a safety precaution.
CAUTION: When connected to the UPS, the EBM will continue to supply power to the UPS, even if the UPS
batteries are disconnected. This is particularly important if the EBM and UPS will be transported while
installed in a rack enclosure.
Installing Remote Emergency Power-off
The UPS includes a REPO connector that enables you to turn off power at the UPS output receptacles
from a customer-supplied switch in a remote location. For example, this feature can be used for
shutting down the load and the UPS by thermal relay, in the event of room overtemperature. When
REPO is activated, the UPS shuts down the output and all its power converters immediately. The UPS
logic power remains on to issue an alarm.
The REPO feature shuts down the protected equipment immediately and does not follow the orderly
shutdown procedure initiated by any power management software. Any devices that are operating on
battery power are also shut down immediately.
When the REPO switch is reset, the equipment will not return to utility or battery power until the UPS
is manually restarted.
The REPO contacts are normally open.
WARNING:
The REPO circuit is an IEC 60950 safety extra low voltage (SELV) circuit. This circuit must be
separated from any hazardous voltage circuits by reinforced insulation.
CAUTION: The REPO must not be connected to any utility connected circuits. Reinforced insulation to the
utility is required. The REPO switch must have a minimum rating of 24 Vdc and 20 mA and be a dedicated
latching-type switch not tied into any other circuit. The REPO signal must remain active for at least 250 ms for
proper operation.
CAUTION: To ensure the UPS stops supplying power to the load during any mode of operation, the input
power must be disconnected from the UPS when the emergency power-off function is activated.