Liebert NX UPS System user manual Output System Connections

Single Module UPS Installation

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.

! 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.

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.

! 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.

8. Refit all protective covers removed for cable installation.

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