Optional Systemi38 Power Warning Signal; Optional Ba?Tery Circuit Breaker; Optional Contact Isolator Board; Optional Dc Ground Fault Alarm - Liebert 300 series Installation, Operaton & Maintenance Manual

5.11 OPTIONAL SYSTEM138 POWER
WARNING SIGNAL
The System/38 Power Warning Signal provides
an isolated normaBy open contact for user
warning circuitry. The contact closes when
utility power fails and the UPS battery is
discharging. A BNC connector is provided for
connection to user supplied cable.
5.12 OPTIONAL BAllERY CIRCUIT
BREAKER
An external Battery Circuit Breaker is available
plants. This option is not required for use with
factory supplied matching battery cabinets. The
battery circuit breaker is provided in a separate
NEMA Type 1 enclosure for wall mounting. The
circuit breaker includes undervoltage release
connection to the optional contact isolator board
located in the UPS module. Refer to Figure L-11
and 512 for installation details.
5.13 OPTIONAL CONTACT ISOLATOR
BOARD
interface at the UPS module to support the
following optional system functions:
. External battery circuit breaker under
voltage release (UVR)
. External battery circuit breaker auxiliary
contact
. Reduced AC input current limit (100% of
nominal) activated by external contact closure
computer power
Refer to Figure 28, 2-9, or 2-10 for w&g
details.
5.14 OPTIONAL DC GROUND FAULT
ALARM
The DC Ground Fault Alarm provides
annunciation of alarm condition when either the
positive (+) or negative (-) DC bus is grounded.
5.15 OPTIONAL COMPUTER
INTERFACE SYSTEM
The Computer Interface System performs an
automatic unattended orderly shutdown of the
customer's operating system when necessary.
Tbis option includes the software required to
interface the UPS to the computer. The software
monitors the UPS for power failure and low
battery alarm while operating as a background
task on the computer. After a power failure
occurs, the software performs an automatic
shutdown when the pre-programmed timer
expires. If the UPS reaches a low battery alarm,
the software will override the timer and perform
an automatic shutdown.
board to provide isolated normally closed
contacts. This option includes a shielded
interface cable with a 25-pin subminiature D-
shell connector to fit the serial port of the
computer file server. Cable is available in
selected lengths from 25 to 300 feet. This option
is installed in the field. Refer to Figure 5-13 for
wiring details.