Liebert Emerson NX UPS System - Manual (Page 18)

Single Module UPS Installation
10
Output System Connections
6. Connect the system output cables between the UPS output (oA-oB-oC-N terminals) and the
critical load and tighten the connections to 5 Nm (M6 Bolt). Ensure correct phase rotation.
Internal UPS Battery Connection
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 8 (or 10) battery blocks in each tier (tray) are interconnected.
b. Connect the positive, neutral 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.
!
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, negative to negative and neutral to neutral, 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.