Emerson 10-30kVA Manuel D’Utilisation

Once the equipment has been positioned and secured for operation, and the battery and ground col-

lars have been connected (see 2.1.4 - Cable Connections), connect the power cables as described 

below. (Study the reference drawing in 7.0 - 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 left side panel to gain easier access to the connections busbars.
3. Connect the safety ground and any easier 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.

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

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 

44 lb-in. (5 N-m) using the M6 bolt provided.

6. The input neutral cable must be connected to the input neutral busbar (N). See Figure 5.

7. For 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 44 lb-in. (5 N-m) using the M6 

bolt provided.

8. For Rectifier Input connect AC input supply cables between the power distribution panel and the 

UPS input circuit breaker (A-B-C terminals)

9. The bypass and rectifier input neutral cables must be connected to the input neutral busbar (N). 

See Figure 5.

10. Connect the system output cables between the UPS output busbars (A-B-C N terminals) and the 

critical load and tighten the connections to 44 lb-in. (5 N-m) (M6 bolt).

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 Global Services.

NOTE
Hydraulic pressure pliers, combinative tools and piston ring pliers should be used to connect 

NOTE
The grounding and neutral bonding arrangement must comply with the National Electrical 

NOTE
Both the rectifier and bypass feeds MUST come from the same utility source, except if the UPS 

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.