Variable speed drives

Variable speed drives (Electrics accessories): brands available: Coelbo, Calpeda, Fourgroup, Nastec, Varem. Products available at Pompes H2O, advice on +33 3 44 25 91 01.

Variable speed drives
Water pump control panel
Pressure switch
Pump automation
Float switch - Regulator of level
Motor protection circuit breaker
Cable
Coupling
Level regulator
Pressure control
Condensator
Solenoid valve
Active filters
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Practical information

Need advice? Our team is available (Monday - Friday: 8:30-12:00 and 13:00-16:30).

Contact us

Delivery

  • Same-day dispatch for orders placed before 12 noon, in most cases.
  • Colissimo without signature in mainland France, delivery within 2 to 3 days.
  • Chronopost on request.
  • DB SCHENKER transport for oversized parcels: delivery to your freight forwarder in France, with guaranteed tracking.
Delivery terms

Advice and guides

Go to our guides

A drive to match pump speed to demand

A variable speed drive changes the supply frequency of the motor and therefore its rotation speed. Paired with a pump, it keeps pressure constant, limits abrupt starts and adjusts the flow to real demand. It is used on surface pumps, boreholes and booster sets.

What to check before buying

  • Input and output voltage: some models turn a single-phase supply into a three-phase output.
  • Power or current of the motor to control, compared with the drive's capacity.
  • Mounting type: wall-mounted drive, integrated drive or kit with a pressure sensor.

Frequently asked questions: Variable speed drives

Can a drive run a three-phase motor from a single-phase supply?

Some models accept a 230 V single-phase input and deliver a three-phase output. Check the product page for the output voltage, the maximum power and the compatibility with the motor wiring.

Which drive should I choose for a borehole pump?

Choose a drive whose power and current match the motor plate. Borehole kits usually include the pressure sensor; the manual explains how to set the target pressure.

Does the drive need protection?

Yes: give it a dry, ventilated location and suitable electrical protection upstream. Follow the manufacturer's instructions for wiring, motor cable length and parameter settings.

Do you need advice before buying?

Our team helps you choose the right equipment for your installation: call +33 3 44 25 91 01 Monday to Friday, 8:30 am to 12:00 pm and 1:00 pm to 4:30 pm (French time), or email contact@pompes-h2o.com. Public bodies can pay by administrative order (mandat administratif), with invoicing through Chorus Pro.