Emerson Liebert NX 50 and 60 Hz - Manual (Page 22)

Single Module UPS Installation
10
Output System Connections
6. Connect the system output cables between the UPS output (U2-V2-W2-N terminals) and the
critical load and tighten the connections to 5Nm for M6 bolts, to 13Nm for M8 bolts or to 26Nm for
M10 bolts. Ensure correct phase rotation.
External UPS Battery Connection (60kVA Models and Above, Option for 30-40kVA Models)
Connect the battery cables between the UPS terminals (+\-) and its associated battery circuit
breaker. Observe the battery cable polarity.
Internal UPS Battery Connection (30/40kVA only)
7. The battery consists of a series string connection of 5 x 8 (or 10) x 12V 6-cell battery blocks.
a. Ensure that the eight (or 10) battery blocks in each tier (tray) are interconnected.
b. Connect the positive and negative cables to the UPS terminals.
c. Plug in the cables between the tiers.
d. Ensure correct polarity battery string series connections (i.e., intertier and
interblock connections are from positive to negative terminals.
8. Refit all protective covers removed for cable installation.
NOTE
When connecting the cables between the battery extremities to the circuit breaker always
connect the circuit breaker end of the cable first.
!
WARNING
If the load equipment will not be ready to accept power on the arrival of the commissioning
engineer, ensure that the system output cables are safely isolated at their ends.
!
WARNING
Hazardous Battery Terminal Voltage 480VDC
Ensure correct polarity of string end connections to the UPS terminals, i.e., positive to
positive and negative to negative, but leave these UPS terminal cables disconnected until
connection is authorised by the commissioning engineer.
Ensure correct polarity of string end connections to the battery circuit breaker and from the
battery circuit breaker to the UPS terminals, i.e., positive to positive and negative to negative,
but disconnect one or more battery cell links in each tier.
Do not reconnect these links and do not close the battery circuit breaker before authorised by
the commissioning engineer.