Transfer to Maintenance Bypass from On-Line

∙Prior to transferring the maintenance bypass to the bypass mode, the UPS must be in bypass. Verify that the UPS does not have a bypass out-of-sync or bypass voltage out-of-tolerance alarm prior to transferring.

∙If no alarms are present, transfer the UPS to bypass by placing the bypass/UPS switch on the back of the UPS in the bypass position. Verify the L1-L2, L1-N and L2-N output voltages, with a DVM, are as per the customers specifications.

∙Rotate the maintenance bypass switch counter- clockwise to the test position. Open the UPS output breaker and silence the alarm. Power is still being powered to the input of the UPS in the test position.

∙Continue rotating the maintenance bypass switch counter-clockwise to the maintenance position. The UPS should now shut off and input power has been removed. Open the input, output and battery breaker prior to servicing the unit.

Transfer to Test from Maintenance Bypass

∙After preventive maintenance or repairs have been performed, it is important to test the UPS prior to placing it on-line. Please use the following steps to test the UPS without transferring on-line.

∙Close the Battery breaker on the UPS. Place the bypass/UPS switch on the back of the unit in the UPS position.

∙Rotate the bypass switch on the maintenance bypass clockwise to the Test position. Close the input breaker on the UPS.

∙The UPS should now be going through its normal testing and start-up procedure. Follow the LCD screen instructions.

∙After the output breaker is closed and the ON button is pressed, the unit should return to the Normal Operation screen. Proceed to the meter screen on the LCD. Verify that meters are within operating specifications.

∙Return the LCD to the Normal Operation screen. Transfer the UPS to bypass by placing the bypass/UPS switch on the back of the unit in the bypass position.

Transfer to On-Line from Test

∙Always verify that the UPS is in the bypass mode prior to transfer to On-Line position. Rotate the bypass switch to the On-Line position.

∙The customer may now bring up their connected critical loads. Always energize the load on bypass, either UPS internal bypass or maintenance bypass.

∙After the load is up and operating, the UPS may now be transferred on-line. Transfer the UPS to the UPS mode by placing the bypass/UPS switch on the back of the unit in the UPS position and pressing the ON button on the front of the unit.

TROUBLESHOOTING/WARRANTY

Troubleshooting

Troubleshooting should only be performed by a trained engineer authorized by. If you cannot resolve a problem, consult Liebert immediately at 1-800-222-5877. Do not continue to use the maintenance bypass cabinet if it is not performing according to specifications.

VM18000, VM12000 specifications

The Liebert VM12000 and VM18000 are advanced precision cooling systems designed to provide reliable temperature and humidity control in critical environments such as data centers, telecommunications facilities, and industrial applications. These systems are engineered to meet the diverse needs of modern infrastructures that demand optimal performance, energy efficiency, and robust reliability.

One of the key features of the Liebert VM series is its high cooling capacity. The VM12000 offers a cooling capacity of 12,000 BTU/h, while the VM18000 provides an impressive 18,000 BTU/h. This makes both models ideal for environments where heat load is significant, ensuring that critical equipment remains within operational limits. The systems employ variable speed technology, allowing them to dynamically adjust cooling output based on real-time conditions, which enhances energy efficiency and performance.

The Liebert VM series is equipped with advanced control systems, including microprocessor controls that enable precise monitoring and adjustments. Users can easily access real-time data through intuitive interfaces, allowing for seamless management of cooling settings. Additionally, the systems can be integrated into building management systems (BMS), offering centralized control that enhances operational efficiency.

Another notable characteristic of the VM series is its modular design. This allows for easy scalability, making it suitable for both small setups and large, complex installations. The flexibility offered by the modular design permits the addition of cooling units as cooling demands grow, ensuring that users can keep pace with their evolving requirements.

In terms of energy efficiency, the Liebert VM12000 and VM18000 meet and exceed the efficiency standards set by the industry. The systems utilize R-410A refrigerant, which is environmentally friendly and contributes to higher energy performance. This focus on sustainability not only reduces the carbon footprint but also lowers operating costs, providing significant savings over time.

Furthermore, the Liebert VM series is built with robust components designed for durability and longevity. The systems are engineered for high performance in demanding conditions, ensuring reliability even in the most challenging environments.

Overall, the Liebert VM12000 and VM18000 precision cooling units stand out for their high capacity, energy efficiency, advanced controls, and modularity. These features make them a top choice for businesses needing reliable cooling solutions to protect their critical infrastructure while also promoting energy sustainability.