HP Tower Uninterruptible Power System - Manual (Page 12)

Component identification 12
IMPORTANT: Pressing and holding the On button without utility present normally initiates a
battery start and the UPS assumes the load. However, if the On button is pressed and a REPO is
detected, battery start is inhibited and the UPS is not able to assume the load. The electronics
module fan spins, and the Self Test, Battery Fault, Site Wiring Fault, and Overtemperature LEDs
and an audible alarm are active as long as the On button is held.
To power down the entire network in the event of an emergency, the REPO ports of multiple UPS units can be
connected to a single switch.
ERM rear panel
Item Description
1 Circuit breaker
2 ERM output connector cable (to the UPS)
3 ERM input connector (from another ERM)