Rectifier and Bypass Input, Earth Leakage RCD

Single Module UPS Installation

1.5.1Rectifier and Bypass Input

Overcurrent protection must be installed at the distribution panel of the incoming main supply. The protection must discriminate with the power cables current capacity and with the overload capacity of the system (see Table 38). As a guideline, a thermomagnetic circuit breaker, with an IEC 60947-2 trip curve C (normal) for 125% of the current listed in Table 1 is suitable.

Split-Bypass—If a split-bypass is used, install separate protective devices for the rectifier and for the bypass in the incoming mains distribution panel.

NOTE

Rectifier and bypass input sources must be referenced to the same neutral potential.

NOTE

For IT power systems, four-pole protective devices must be used, external to the UPS, both upstream of the input distribution panel and downstream (toward the load).

Earth Leakage (RCD)

Any residual current detector (RCD) installed upstream of the UPS input supply must be:

•sensitive to DC unidirectional pulses (Class A)

•insensitive to transient current pulses, and

•must have an average sensitivity, adjustable between 0.3 and 1A.

Figure 1 Residual current circuit breakers (RCCB) symbols

To avoid false alarms, earth leakage monitoring devices when used in systems with split-bypass input or when used in paralleled UPS configurations, must be located upstream of the common neutral sinking point. Alternatively, the device must monitor the combined four-wire rectifier and split- bypass input currents.

The residual earth current introduced by the RFI suppression filter inside the UPS is greater than 3.5mA, 1000mA for 30-80kVA, 2000mA for 100-120kVA models and less than 2500mA for

140-200kVA models. Liebert recommends verifying the selectivity with all other differential devices both upstream of the input distribution board and downstream (toward the load).

1.5.2External Battery

The UPS and its associated batteries are protected against overcurrents through a DC compatible dis- connect device.

1.5.3UPS Output

Any external distribution board used for load distribution shall be fitted with protective devices that discriminate with those used at the bypass input to the UPS and with the UPS overload characteris- tics (see Table 38).

30-200kVA, 400V, 50 and 60 Hz specifications

The Emerson 400V, 50 and 60 Hz, 30-200 kVA is a robust and versatile power solution designed for various industrial and commercial applications. This equipment delivers a reliable source of power, ensuring operational continuity and efficiency for numerous critical systems.

One of the standout features of the Emerson 400V series is its exceptional load handling capability. With a kVA range of 30 to 200, it can cater to both small-scale operations and larger enterprises, making it a flexible choice for businesses looking to scale their operations. The dual frequency capability of 50 and 60 Hz allows the system to be utilized in various geographical locations, accommodating different regional power standards.

The series is built with advanced power electronics technology, resulting in a highly efficient energy conversion process. This technology not only boosts performance but also reduces energy losses, leading to significant cost savings in operational expenditures. Moreover, the Emerson 400V solution is designed with an emphasis on minimizing harmonic distortion, ensuring that it meets stringent regulations and preserving the integrity of sensitive electronic equipment.

Another critical characteristic of the Emerson 400V series is its modular design. This allows for easy upgrades and maintenance, ensuring that businesses can adapt their power solutions as their needs evolve. The system features a user-friendly interface for monitoring and managing power loads, enhancing operational oversight.

Additionally, the Emerson 400V series emphasizes robust safety features to protect both equipment and personnel. Integrated protection mechanisms, such as overload and short-circuit protection, provide peace of mind and safeguard against potential power-related incidents.

In terms of physical design, the unit is built for durability, capable of withstanding harsh operating environments while maintaining performance integrity. The compact footprint ensures that it can fit into various spaces without sacrificing power output.

Overall, the Emerson 400V, 50 and 60 Hz, 30-200 kVA system represents a comprehensive power solution that combines high efficiency, adaptability, and advanced technology, making it an ideal choice for organizations aiming for reliable power management and operational excellence.

Emerson 400V Rectifier and Bypass Input, Earth Leakage RCD, External Battery, UPS Output

Models: 30-200kVA 400V 50 and 60 Hz