Danfoss PC-115 AC Drives Pack Controller Instructions

Danfoss PC-115 AC Drives Pack Controller

Product Information

Specifications

• Brand: Danfoss
• Product Name: Ventilation Solution for Micheville Tunnel
• Efficiency: High efficiency, low harmonic
• Cable Type: Unscreened long cable
• Capacity: 22 ventilation units of 22 kW each
• Application: Ventilation system for tunnels

Product Usage Instructions

Installation

When installing the ventilation solution for the Micheville Tunnel, ensure that each ventilation unit is properly connected to the power source using the provided unscreened long cable.

Operation

For efficient ventilation, make sure to control the speed of the jet fans using AC drives located in the independent technical rooms at the entrance of each tunnel. The variable speed control allows for energy-efficient operation based on ventilation requirements.

Maintenance

Regularly inspect the ventilation units and cables for any signs of wear or damage. Ensure that the drive system is functioning properly and address any issues promptly to maintain optimal ventilation performance.

FAQ (Frequently Asked Questions)

Q: Can the ventilation solution be used in other tunnel projects?

A: While the ventilation solution was designed for the specific requirements of the Micheville Tunnel in Luxembourg, it can potentially be adapted for similar tunnel projects with long motor cable demands.

Q: How does the drive system handle reverse flow direction?

A: The drive system ensures fast reversibility of jet fan direction by applying momentary over-torque acceleration and dissipating energy generated by deceleration on a brake resistor, allowing for quick changes in the airflow direction.

Case Story | VLT® HVAC Drive FC 102

• Michelle achieves high-performance tunnel ventilation even with long cables
• Ventilation of the Micheville Tunnel in Luxembourg placed difficult demands on the electrical installations.
• However, Danfoss met the challenge and provided a high efficiency, low harmonic, unscreened long cable solution. As a bonus, it also reduced costs by eliminating the need for a voltage booster transformer.

Usage Instructions

Micheville tunnel project

• The Micheville Tunnel was built to facilitate access to the Belval area and to relieve congestion in the cross-border area of France and the Grand-Duché de Luxembourg by some 25,000 vehicles per day.
• For good ventilation safety, the tunnel is constructed as two parallel tubes of 750 m each. A total of 22 ventilation units of 22 kW each were installed.
• Geographic location of the Micheville Tunnel.

The challenge: long motor cables and reverse flow

• The project demanded high fan efficiency despite long motor cables, and the ability to reverse flow direction quickly.
• Variable speed control via AC drives was applied to increase the energy efficiency of each jet fan in function of the requirements.
• The AC drives are located in an independent technical room at the entrance of each tunnel, which means the length of the motor cable reaches up to 800 m.
• With such length, it is normally not possible to carry the high-frequency output signal of a drive without significant loss.
• In addition, the cable would normally have to be screened to avoid the emission of interference, which would further reduce the quality of the signal.
• The fast reversibility of the jet fan direction was required to guarantee a minimum speed of airflow in the event of a fire outbreak.
• The solution: VLT® HVAC Drive FC 102 To provide the required energy efficiency and keep the performance of the jet fans as high as possible, fan control was delivered by a VLT® HVAC Drive FC 102 supplemented with an all-pole sine filter.
• This solution makes it possible to use unscreened cables while complying with the EMC electromagnetic compatibility standards. Thanks to this solution, a voltage booster transformer is not required.
• The voltage drop is limited to a minimum at the motor terminals, making this additional investment unnecessary.
• To reverse rotation as fast as possible, the drive ensures a momentary over-torque acceleration and dissipates the energy generated by the deceleration on a brake resistor.
• One of the two technical rooms with brake resistors at the end wall.

Micheville Tunnel ventilation project partners

• Engineering consultants Contractor: Socom S.A.
• Danfoss Agent delivering technical assistance in Grand-Duché de Luxembourg: General Technic Building Solutions Sàrl
• danfoss.com/drives

Documents / Resources

| Danfoss PC-115 AC Drives Pack Controller [pdf] Instructions
PC-115 AC Drives Pack Controller, AC Drives Pack Controller, Drives Pack Controller, Pack Controller, Controller
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References

• Global AC drive manufacturer - Danfoss Drives | Danfoss
• Global AC drive manufacturer - Danfoss Drives | Danfoss

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