Emerson 40-200KVA user manual Cabling Procedure, Common Input Connections, Dual Input Connections

Electrical Connections

3.1.7Cabling Procedure

NOTICE

Risk of improper installation. Can cause improper operation and void warranty.

The operations described in this section must be performed by authorized electricians or qualified technical personnel. If you have any difficulties, contact your local Liebert® representative or Liebert Services.

NOTE

Hydraulic pressure pliers, combinative tools and piston ring pliers should be used to connect AC wiring.

Once the equipment has been positioned and secured for operation, and the battery and ground collars have been connected (see 3.1.4 - Cable Connections), connect the power cables as described below. (Study the reference drawing in 8.0 - Installation Drawings.)

1.Verify that all incoming high and low voltage power circuits are de-energized and locked out or tagged out before installing cables or making any electrical connections.

2.Remove the front protective cover to gain easier access to the connections busbars.

3.Connect the safety ground and bonding ground bus cables to the copper ground busbar located on the bottom of the equipment below the power connections. All cabinets in the UPS system must be connected to the user’s ground connection.

NOTE

The grounding bonding arrangement must comply with the National Electrical Code and all applicable local codes.

4. Identify and make power connections with incoming cables according to Steps 5 through 11.

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 3.

7.For the bypass, connect the AC input supply cables between the power distribution panel and the UPS Rectifier Input busbars (CB1 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 Rectifier Input busbars (CB1 A-B-C terminals).

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