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4.5
BCB Shunt Trip
The Liebert NX battery cabinet has the shunt trip installed in the circuit breaker. When a DC ground
fault (using the optional DC Ground Fault kit), a battery overtemperature or EPO is activated, the
shunt trip will open the circuit breaker.
NOTE
The Liebert NX battery Cabinet circuit breaker will not open at the end of a battery discharge.
The UPS will isolate the batteries internally in this situation.
4.6
Alber Monitoring System—Optional
The Liebert matching battery cabinet allows installing an optional Alber
in the cabinet. The Alber Battery Monitoring by Liebert continuously checks all critical battery
parameters, such as cell voltage, overall string voltage, current and temperature. Automatic periodic
tests of internal resistance of each battery will verify the battery's operating integrity. Additional
capabilities include automatic internal DC resistance tests and trend analysis providing the ability to
analyze performance and aid in troubleshooting.
The Alber monitoring system is installed inside the battery cabinet (see Figure 9). The monitoring
system requires approximately 0.5A, single-phase 480V.
NOTE
This power must be UPS protected.
This power can come from the output terminals of the UPS, a distribution panel, or another
UPS-protected source. This power is to be field supplied. See Figure 37 for wiring location.
For details about operating the Alber system, see the Alber Monitoring System manual.
®
™
Liebert
NX
27
Battery Installation
battery monitoring system
®
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