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6 Remote Power-Off Device — Installation and Quick Start
Contact Closure Setup with Multiple UPSs
To eliminate the need for multiple contact closures at the
remote switch, do one of the following:
• Use an applied voltage switch.
• Use a cascading setup.
Warning
To connect multiple UPSs to a system that uses
contact closures to turn off the UPSs, you must
provide a separate set of contact closures for
each UPS. Do not set up multiple UPSs in a
parallel configuration to a single set of contacts.
A parallel configuration can introduce
intersystem ground noise or generate false EPO
signals at the integrated EPO interface of a
UPS or at the Remote Power-Off Device.
See “Cascade multiple RPOs (serial setup)”
on page 20.
Note
You can include only one APC Matrix-UPS
in a cascading configuration, and you must
place it at the end of the series of UPSs.