Installing The Ups; Installing Remote Emergency Power-Off - Dell 3750W User Manual

Installing the UPS

To install the UPS:
1
If you plan to use Dell UPS Management Software, connect your computer to the USB port using
the supplied cable. For more information about communication options, see page 54.
2
If your rack has conductors for grounding or bonding of ungrounded metal parts, connect the
ground cable (not supplied) to the ground bonding screw. See "Identifying the UPS Rear Panels"
on page 15 for the location of the ground bonding screw for each model.
3
If an emergency power-off (disconnect) switch is required by local codes, see the following section,
"Installing Remote Emergency Power-off" (REPO) to install the REPO switch before powering on
the UPS.
4
Plug the equipment to be protected into the UPS output receptacles, but do not turn on the
protected equipment.
5
Make any necessary provisions for cord retention and strain relief.
NOTE:
Verify that the total equipment ratings do not exceed the UPS capacity to prevent an overload alarm.

Installing Remote Emergency Power-off

REPO is used to shut down the UPS from a distance. 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.
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Installation