Electrical Connections—UPS

3.2.9Protective Devices

For safety, it is necessary to install circuit breakers in the input AC supply external to the UPS system. Given that every installation has its own characteristics, this section provides guidelines for qualified installation engineers with knowledge of operating practices, regulatory standards and the equipment to be installed.

UPS Rectifier and Bypass Input Supply

•Protection from excessive overcurrents and short circuits in power supply input

External overcurrent protection for the AC output circuit is to be provided. See 11.4 - UPS Elec- trical Characteristics and Table 47 for overload capacity.

A breaker is used for internal battery circuit overcurrent protection. When an external battery supply is used, overcurrent protection for the battery circuit is to be provided by the customer.

•Dual Input Single Source

When wiring the UPS with dual inputs but with a single input source, the Rectifier input and the Bypass input must be protected separately. Size the breakers according to the input currents shown in Table 41.

Fuses

The Liebert APM’s main input and bypass input busbars are equipped with fuses (six locations; see Figure 33). The type is Bussman 170M4465, rated at 550A and 700V.

System Output

When using an external distribution panel for load distribution, the output neutral and input neutral must be separated at the input to the UPS.

3.2.10 Cabling Procedure

! CAUTION

The operations described in this section must be performed by authorized electricians or qualified technical personnel. If you have any difficulties, contact your local Emerson 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 lugs have been connected (see 3.2.6 - Cable Connections), connect the power cables as described below. (Study the reference drawing in 6.0 - 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 right 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 in the middle of the Liebert® APM™ below the Input and Bypass connections. All cabinets in the UPS system must be connected to the user’s ground connection.

NOTE

The grounding and neutral 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 8.

Common Input Connections

5.For common bypass and main inputs, connect the AC input supply cables to the UPS input terminals (A2-B2-C2-N1) and tighten the connections to 240lb-in. (27N-m) (M10 Bolt). Ensure correct phase rotation.

NOTE

For common bypass and main inputs, the AC input cables must be connected to the bypass terminal (A2-B2-C2-N1) but not the main input terminal (A2-B2-C2).

30

Page 39 Page 41
Page 40
Image 40
Emerson 115-600V Protective Devices, UPS Rectifier and Bypass Input Supply, Fuses, System Output, Cabling Procedure
Page 39 Page 41

115-600V, 115-208, 115-120, 115-50/60HZ, 115-480 specifications

The Emerson 15-90KVA series is a robust and versatile power solution designed for various applications including commercial, industrial, and data center operations. Operating at voltage ranging from 115 to 480 volts, and supporting frequencies of either 50 or 60 Hz, this series is engineered to meet diverse power requirements.

One of the standout features of the Emerson 15-90KVA is its exceptional reliability and performance under varying load conditions. This power system incorporates cutting-edge technologies that enhance operational efficiency while minimizing downtime. The robust design of the system enables it to maintain optimal performance even in harsh environmental conditions, providing power continuity and safeguarding critical operations.

The Emerson 15-90KVA is equipped with advanced protection mechanisms that ensure the safety of connected equipment. These include overload protection, short-circuit protection, and thermal protection systems, which work together to prevent potential damage from power surges or faults. Moreover, the unit features a user-friendly interface that facilitates easy monitoring and control, enabling operators to track performance metrics and manage power supply effectively.

Another significant characteristic of this power series is its modular design, allowing for scalability and flexibility. Users can easily add or remove capacity based on changing power demands without the need for extensive system overhauls. This scalability makes the Emerson 15-90KVA ideal for growing businesses that require adaptable power solutions.

Energy efficiency is a focal point for the Emerson power series. Utilizing advanced power electronics and intelligent control algorithms, the system minimizes energy losses, ensuring that more power is available for direct usage. This not only reduces operational costs but also aligns with growing sustainability initiatives by lowering the overall carbon footprint.

In summary, the Emerson 15-90KVA series is a high-performance power solution characterized by its reliability, advanced protection features, modular scalability, and energy efficiency. Its versatility across multiple voltage levels and frequency options makes it suitable for a wide range of applications, solidifying its position as a preferred choice in the industry. Whether for industrial facilities, data centers, or commercial spaces, the Emerson 15-90KVA is designed to meet and exceed power demands effectively and efficiently.
Top Page Image Contents