Emerson 480V, 60HZ Common Input Connections, Dual Input Connections, Frequency Converter Mode

Electrical Connections

4. Identify and make power connections with incoming cables according to Steps 5 through 10.

Common Input Connections

5.For common bypass and rectifier inputs, connect the AC input supply cables between the power distribution panel and the UPS input busbars (A-B-C terminals) and tighten the connections to 88 lb-in. (10 N-m) using the M8 bolt provided.

Dual Input Connections

6.Remove the internal links installed between the Input circuit breaker (CB1) busbars and Bypass Input busbars as shown in Figure 4.

7.For the bypass, connect the AC input supply cables between the power distribution panel and the UPS input busbars (A-B-C terminals) and tighten the connections to 88 lb-in. (10 N-m) using the M8 bolt provided.

8.For the Rectifier Input, connect AC input supply cables between the power distribution panel and the UPS input circuit breaker (A-B-C terminals).

NOTE

Both the rectifier and bypass feeds MUST come from the same utility source.

Output System Connections—Ensure Correct Phase Rotation

9.Connect the system output cables between the UPS output busbars (A-B-C terminals) and the critical load and tighten the connections to 88 lb-in. (10 N-m) (M8 bolt).

! WARNING

If the load equipment will not be ready to accept power on the arrival of the commissioning engineer, then ensure that the system output cables are safely isolated.

Observe the battery cable polarity. Be sure that the battery connector is made with the cor- rect polarity.

10. Refit all protective covers removed for cable installation

Frequency Converter Mode

If a frequency converter configuration is used, connect the AC input supply cables to the rectifier input busbars (A-B-C terminals). Torque to 88 lb-in (10N-m) for M8 bolts. Ensure correct phase rota- tion. There will not be any AC bypass supply cables to the bypass input (A-B-C terminals) and tighten the connections.

NOTE

The operations described in this section must be performed by authorized electricians or qualified technical personnel. If any difficulties arise, contact Liebert at 1-800-LIEBERT.

NOTE

For frequency converter operation, ensure that the linking busbars between the bypass and the rectifier input are removed.

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