Manuals / Liebert / Computer Equipment / Surge Protector

Liebert Type SS, SAD Hybrid Advantage, Interceptor II, LM, AccuVar System Grounding and Bonding

Models: PanelGuard Extension LM Interceptor II ATF Series SAD Hybrid Advantage Type SS PowerSure LPM/LPL Series AccuVar

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System Grounding and Bonding

The performance and safety of any SPD system is dependent on proper grounding and bonding. Grounding is required for safety. Correct implementation also enhances equipment performance. Incorrect grounding can reduce or impede the SPD’s operation.

All electrical circuits to the SPD must include an equipment- grounding conductor as required by the NEC and local codes.

An insulated grounding conductor is required in addition to any metallic raceway, which may be used as a grounding conductor. For parallel-connected SPDs, the grounding conductor should be the same wire size as the associated power conductors. Grounding conductors must be routed with the associated power conductors in the same raceway (conduit).

When metallic raceways are used, adequate electrical continuity must be maintained at all raceway connections, particularly raceway terminations to the electrical enclosures.

The use of isolating bushings or other means to interrupt a metallic conduit run is a potential safety hazard and is not recommended.

Grounding Electrode — Surge protective devices do not discharge all surges to ground (earth). Surge protective devices divert the surge current back to its source to complete the electrical circuit.

In the case of lightning whose potential is developed with respect to the earth, the SPD diverts the surge current to the grounding electrode (earth connection). However, for most transient surges that are developed by switching loads, the SPD diverts the surge current back to its source without involving the grounding electrode.

For proper SPD performance, the service entrance grounding electrode system must comply with the NEC by having all available electrodes (building steel, metal water pipe, driven rods, concrete encased electrodes, etc.) properly bonded together and connected to the power system grounding.

The use of a separate grounding electrode to ground the SPD defeats the effectiveness of the SPD, is a potential safety hazard, may cause equipment damage, is an NEC violation (reference NEC 250-51 and 250-54), and is not recommended.

Surge Suppression Systems

FOR PROPER AND SAFE OPERATION, THE NEUTRAL, (IF PROVIDED), MUST BE RELIABLY CONNECTED TO THE NEUTRAL OF THE SOURCE. FAILURE TO PROVIDE A RELIABLE NEUTRAL CONNECTION MAY RESULT IN MODULE FAILURE!

SPD Monitoring

External Status Indicators — These indicators provide a summary of the status of the surge SPD module. For normal conditions, the green “OK” LED is illuminated and the red “Service” LED is extinguished. If the surge SPD module requires replacement, the green “OK” LED is turned off and the red “Service” LED illuminated.

Summary Alarm Contact (if applicable) — Summary alarm Form C (1 N.O. and 1 N.C.) relay contacts may be provided for remote indication of the failed surge SPD module.

Contacts are rated 5 amps at 250 VAC maximum with a power factor of 1.0. For units with Summary Alarm Contacts, access to the contacts are typically provided via contact terminals located on the printed circuit board mounted on the inside of the unit’s cover.

Transient Counter (if applicable) – Transient counters are provided for transient voltage surge monitoring. The counter totalizes surges monitored since the last counter reset.

The transient counter monitors line transient voltages. The circuit counts all surges that deviate from the line sine wave. The factory setting is 30% over nominal line voltage. Other settings include 50%, 70%, and 100%.

Swell Counter (if applicable) — The swell counter monitors line to line & line to neutral voltages. It is factory set to record whenever the peak voltage on any normal mode exceeds the nominal voltage of the TVSS for more than 10ms. This counter records temporary line over voltages that may result from utility switching, line regulation problems, etc.

Audible Alarm (if applicable) — If the surge SPD module requires replacement, an audible alarm is activated to draw attention to the fact that repair service is required to restore the system to normal operation. An audible alarm disable is provided to silence the alarm. The system will automatically reset itself after repair. The audible alarm switch and “Service” LED can be tested by activating the “Test” switch on the system monitor panel. For information on the AccuVar Series Alarm, see page 16.

Installation, Operation and Maintenance Manual

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Liebert TVSS Units SL-22085 Rev 2, 11/2006

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Liebert Type SS, SAD Hybrid Advantage, Interceptor II, PowerSure LPM/LPL Series, LM, AccuVar System Grounding and Bonding
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PanelGuard Extension, LM, Interceptor II, ATF Series, SAD Hybrid Advantage specifications

The Liebert AccuVar is a cutting-edge power management solution designed to optimize and protect critical infrastructure. This system is well-known for its unique ability to provide variable voltage and current, ensuring that equipment receives the right level of power needed for optimal performance. One of its main features is the capability for advanced energy management, which aids in reducing operational costs and improving energy efficiency. This is particularly beneficial in environments where power consumption is a major concern.

Another product in this domain is the PowerSure LPM/LPL Series. This series is specifically designed for high-performance applications, featuring a compact design that maximizes space efficiency without compromising on power quality. With excellent surge protection and state-of-the-art noise filtering technologies, the PowerSure series is perfect for protecting sensitive electronic equipment. Its real-time diagnostic capabilities allow users to monitor power quality continuously, which is crucial for both operational stability and preventative maintenance.

The Type SS is a reliable solution for mission-critical applications, featuring an advanced system architecture that ensures uptime and reliability. With high operating efficiency and low total harmonic distortion, the Type SS minimizes operational risk while enhancing system performance. Its modular design provides flexibility in scaling and upgrading systems according to the changing needs of the business.

The SAD Hybrid Advantage showcases a blend of traditional and innovative technologies, enabling an optimal balance between performance and reliability. This series employs a hybrid system that leverages both linear and switching technologies, offering superior load handling capabilities. Enhanced thermal management and intelligent control features ensure that the system operates efficiently, regardless of load variations.

Lastly, the ATF Series is engineered for robust protective capabilities and versatile application in challenging environments. With features such as integrated battery management and customizable configuration options, the ATF series is adaptable for various power needs. The system’s ease of installation and user-friendly interfaces make it highly accessible for IT and facility managers.

Overall, these power management solutions represent a significant leap forward in technology, offering businesses a wide range of features including efficiency, reliability, and adaptability in their power systems. Each series serves distinct applications, ensuring that there is a suitable solution for every critical infrastructure need.