Installation Manual Liebert Hipulse E Chapter 2 - Installation Procedure
Single or '1+N' UPS System Installation (Electrical)
(07/04) Page 2-13
2.3.4 Back Feed Protection
Using an auxiliary terminal (pins 9-10 of connector X4) the UPS provides a normally open contact to be used for
opening of an external circuit protection device, to protect the operator against backfeed of energy resulting from a
short-circuit fault of the Bypass line SCRs. This auxiliary contact can be used, for example, in series with an external
low voltage source, in order to supply the trip coil of an automatic circuit breaking device, located upstream of the UPS
Bypass mains input. In the event of energy being backfed the auxiliary circuit will activate closing the normally open
contact and as a result opening of the external circuit breaking device; the UPS is disconnected from the Bypass mains
supply. The electrical characteristics of the auxiliary contact are 50V (a.c. or d.c.) @ 1 Amp.
2.3.5 Fan Failure Alarm Indicator (Optional)
Liebert Hipulse E is designed to allow the installation of a device to control the correct operation of fans.
The kit includes the Fan Failure Alarm Indicator, interconnection components (loose and anchored connector) and
related wiring. This function employs an electromagnetic device installed on each individual fan, which gives an alarm
signal on the operator display panel and turns on a Led on the Fan Failure Alarm Indicator in the event that a fan slows
down or shuts down entirely.
If an alarm displays on the operator control panel, determine the physical location of the faulty fan using the
identification lable placed next to the "Fan Failure Alarm Indicator card".
A remote signal may be provided by installing appropriate alarm interface cards.
2.3.6 Battery ground fault detection (Optional)
To guarantee a continuously uninterruptible power supply to the critical load, single module UPS or parallel UPS
systems are provided with external batteries, so the battery insulation to PE (Protection Earth) shall be monitored to be
in a safe range. For this purpose the battery system is fitted with a DC monitoring device to detect and eliminate earth
faults to ensure operational continuity, this is included in a Battery Fault Detection Set.
The Battery Ground Fault Detection is the same for all UPS sizes.
When a battery ground fault is detected, an alarm will appear on the display panel (if the interface card is installed
within UPS and X6 jumper has fitted on 2-3).
A remote warning may be provided by installing an other alarm interface card.
The Battery ground fault detection (P/N 4645313X) contains fault detection device only. The wiring cables are already
installed within UPS. This option is fitted on DIN guide as shown in the installation drawings in Chapter 6.
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