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Electrical Preparation:
Electrical Requirements for the Dell UPS
UPS Model
UPS Technology
3750W Rack
Online
4200W Rack
Online
5600W Rack
Line-Interactive
5600W Rack
Online
Note: Overcurrent protection should be 'slow-break', suitable for devices with a high inrush current. Normally this should be a fuse or
circuit breaker with a Type-C or Type-3 rating.
Electrical Requirements for the REPO Switch (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 over-temperature. 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.
There are two REPO ports on each UPS in order to support cascaded REPO functionality. This allows a single cable to
be cascaded between multiple Dell UPS, eliminating the need for a dedicated REPO cable for each UPS & simplifying
installation.
The REPO contacts are normally open.
Wire Function
Remote Emergency Power Off (REPO)
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 24Vdc 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 250ms for proper operation.
NOTE: For Europe, the emergency switch requirements are detailed in Harmonized document HD-384-48 S1, "Electrical
Installation of the Buildings, Part 4: Protection for Safety, Chapter 46: Isolation and Switching."
NOTE: The pins must be open to keep the UPS running. If the UPS shuts down because the REPO connector pins are shorted,
restart the UPS by re-opening the REPO connector pins and turning on the UPS manually.
Maximum resistance in the shorted loop is 10 ohm.
NOTE: Always test the REPO function before applying your critical load to avoid accidental load loss.
Dell UPS Site Preparation Guide, EMEA (230V)
Input Voltage (VAC)
Power Draw
(standby)
208, 220, 230, 240
208, 220, 230, 240
208, 220, 230, 240
208, 220, 230, 240
Terminal Wire Size Rating
2
4-0.32mm
186W
210W
224W
143W
(12-22 AWG)
Overcurrent
Minimum Wire Size
Protection
(LiveNeutral/Ground)
25A 1-phase
10 / 10 AWG
30A 1-phase
10 / 10 AWG
32A 1-phase
10 / 10 AWG
32A 1-phase
8 / 10 AWG
Suggested Wire Size
2
0.82mm
(18 AWG)
Revision 1, February 2012
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