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Remote Power-Off Device — Installation and Quick Start 5
Safety Information: Eliminate the Hazard
Block access to
accessory
devices
The Remote Power-Off Device can provide a useful alternative
to the integrated EPO interface of a UPS in any of the
following situations:
• Your system configuration requires either of the
following to turn off the output from the UPS:
– a switched-voltage signal (instead of a contact
closure)
– a normally closed contact closure
• A limited number of contact closures is available at the
remote EPO interface for turning off the output of
multiple UPSs.
If you cannot use an EPO system with your Remote Power-Off
Device, block access to any accessory device that could
override the RPO.
You can block access to accessory devices in the following
ways:
• To block access by all accessories that could briefly
override the RPO over a network connection, plug the
network router (or concentrator) into the UPS. With this
setup, turning off output power to the UPS turns off
power to the network connection to the UPS.
• To prevent users from issuing UPS turn-on commands
from specific APC accessory devices:
– PowerView display interface: Limit users’ access to
this accessory device.
– Network Management Card, Web/SNMP
Management Card, or PowerNet SNMP Adapter:
Remove the Ethernet cable.
– Network Management Card EM/MDM (AP9618):
Unplug the telephone cable.
– Out-of-Band Management Card: Disconnect the
modem connection.
Electrical
Hazar
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You must prevent users from inadvertently
using accessory devices to turn on the UPS if
you cannot remove utility power from the UPS
and if it is essential that the RPO continue to
keep the UPS output power turned off.