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Installing the remote emergency power-off
The uninterruptible power supply includes a remote emergency power-off connector
that enables you to turn off power at the uninterruptible power supply output
receptacles from a customer-supplied switch in a remote location. For example, you
can use this feature to shut down the load and the uninterruptible power supply by
thermal relay, in the event of a room overtemperature condition. When a remote
emergency power-off is activated, the uninterruptible power supply shuts down the
output and all its power converters immediately. The uninterruptible power supply
logic power remains on to issue an alarm.
The remote emergency power-off feature shuts down the connected devices
immediately and does not follow the orderly shutdown procedure that is initiated by
any power-management software.
Any devices that are operating on battery power are also shut down immediately.
When the remote emergency power-off switch is reset, the connected devices do
not return to battery power until the uninterruptible power supply is restarted
manually.
Notes:
1. The remote emergency power-off contacts are open by default. To change this
setting, see the REPO setting in Table 8 on page 24.
2. 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.”
Table 3. Remote emergency power-off connections
Wire function
Terminal wire size
rating
Suggested wire size
Remote emergency
power-off L1 4 - 0.32 mm
2
(12 - 22
AWG)
0.82 mm
2
(18 AWG)
L2
Notes:
1. The pins must be open to keep the uninterruptible power supply running. If the
uninterruptible power supply shuts down because the remote emergency
power-off connector pins are shorted, restart the uninterruptible power supply by
reopening the remote emergency power-off connector pins and turning on the
uninterruptible power supply manually. Maximum resistance in the shorted loop
is 10 ohm.
2. To avoid accidental load loss, always test the remote emergency power-off
function before you apply your critical load.
To connect a remote emergency power-off switch, complete the following steps:
1. Turn off the uninterruptible power supply and disconnect all external cables and
power cords.
2. Remove the remote emergency power-off connector from the accessory kit.
Chapter 2. Installing the uninterruptible power supply
15