Nocchi Frequency Changer L

Summary

Product Identification

Nocchi Frequency Changer L are automatic pressure booster sets designed for installation on water mains. They feature three-phase electric power supply, transducer control, and variable speed operation.

Key characteristics include:

• Silent operation
• Constant pressure
• Pipelines in AISI 304 stainless steel
• Quality frequency converter

The system modulates the speed of the first pump via an inverter linked to an electronic board and pressure transducer to maintain constant outlet pressure, regardless of water demand (within the first pump's flow rate limits). If demand exceeds the first pump's capacity, a second pump starts at a fixed speed while the first continues modulation. After water delivery, the inverter-controlled pump runs at a higher speed for a settable interval to store pressurized water, extending pump standby time.

Operating Limits

• Maximum operating pressure: 16 bar
• Ambient temperature: +50° C

Electrical

• Power supply voltage: 400 V
• Direct pump start-up: Direct up to 7.5 kW inclusive; Star/Delta over 7.5 kW
• Operating frequency: 25 - 50 Hz
• Electric pump protection rating: IP55 (IP44 for MULTINOX-VE)
• Electrical panel protection rating: IP54

The control panel features an IP54 metal enclosure and includes:

• Main switch
• Keypad with SA electronic board
• Fuses, contactors, and thermal relay for each pump
• Transformer with fuses for auxiliary circuit
• M-0-T selector for each pump
• Delta-Star starter for motors over 7.5 kW

Mechanical / Hydraulic

The booster sets are constructed with:

• Electric pump (VLR models): Centrifugal, multi-cell, vertical axis
• Base: Galvanized steel profile
• Suction manifold: In AISI 304 stainless steel, including 1 water filling hose, 1 brass ball valve*, and 1 check valve*
• Delivery manifold: In AISI 304 stainless steel, including 1 pressure gauge, 1 pressure transducer (0-5 Volt – 0-10 Bar), and 1 brass ball valve* * Components for each electric pump installed.

General Flow Rate Capabilities

• 2 pumps: from 100 to 1400 L/min (from 6 to 84 m³/h)
• 3 pumps: from 150 to 2100 L/min (from 9 to 126 m³/h)
• 4 pumps: from 200 to 2800 L/min (from 12 to 240 m³/h)

Application Data (Maximums)

• VLR 8: Maximum flow rate 24 m³/h, Maximum head 103 m.c.a.
• VLR 16: Maximum flow rate 36 m³/h, Maximum head 91 m.c.a.
• FCD20: Maximum flow rate 48 m³/h
• FCD30: Maximum flow rate 63 m³/h
• FCD40: Maximum flow rate 84 m³/h
• FC.20: Maximum flow rate 84 m³/h, Maximum head 89 m.c.a.
• FC.30: Maximum flow rate 126 m³/h
• FC.40: Maximum flow rate 240 m³/h

Detailed hydraulic performance tables, including specific flow rate, head, and power (kW) for various models (e.g., FCD20-VLR4, FCD20-VLR8, FCD20-VLR16, FC.20-VLR32, FCD30-VLR8, FCD30-VLR16, FC.30-VLR32, FCD40-VLR8, FCD40-VLR16, FC.40-VLR32), are available in the official PDF.

Overall dimensions and weights for all models are also detailed in tables within the official PDF.

Control Features

Main Functions

• Sequential inversion of pump start-up at the end of each work cycle.
• Settable timer (0 to 255 sec.) for pump operation after pressure switch contact opening or when operating pressure values are reached.
• ON/OFF control of tank level for first collection or pressure in supply pipeline via a float switch or other differential pressure switch.
• Sequential control of pump start-up to prevent simultaneous activation.

Signals and Controls

• LCD display for operating parameters and configuration settings.
• Power ON indicator LED.
• Indicator LED for low water level in tank or low pressure on water supply line.
• Indicator LED for overload thermal cut-out trip.
• Automatic/Manual mode indicator LED.
• Pump running indicator LED for each pump.
• Buttons for selection of automatic or manual control.
• Start-stop button for each pump when set to manual mode.
• Button to enter configuration parameters.

External Control Devices

• ON/OFF float switch installed in the water collection tank.
• 3 electrodes for electronic level control in first collection tank.
• Inverse pressure switch inserted in water supply line (aqueduct).

Accessories (available on request)

• Float switch for protection against dry running
• Differential pressure switch for inhibition in event of mains pressure failure
• Electrodes for electronic level control
• Membrane autoclaves

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the complete OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror