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Veichi × Delta Electronics × Danfoss × Schneider Electric × VFD-EL × Altivar 320 × Micro Drive FC51 × AC310 ×
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VFD for a pump: what we ask before picking one

Customers come with three typical jobs. First: water supply for villages or utilities (trunk plus booster pumps 5.5-75 kW). Second: borehole or surface irrigation for farms plus greenhouses (1.5-22 kW). Third: industrial circulation in heating loops. Foundry mold cooling. Water treatment. Typical customer this year: a farmer with two 7.5 kW borehole pumps, a village with a 30 kW pump station, a production shop with an 11 kW loop pump.

What separates a "proper" pump VFD from a generic one. First: built-in PID controller that holds pressure or flow from a sensor signal (4-20 mA or 0-10 V). Second: sleep mode, the drive lowers speed or stops the motor when flow is zero, 30-50% energy savings on a typical 24-hour cycle. Third: dry-run protection via minimum current or pressure-relay feedback. Fourth: multi-pump function (rotates 2-4 pumps for even wear). On a standard GD20 these are partial; on a dedicated GD200A, ACQ80, or Altivar 320 Solar they are full.

Which models we ship for pump jobs

From stock. Veichi AC70-T3 (5.5-75 kW): our main product, P mode for pump duty, PID, sleep mode, multi-pump up to 4 units, in stock monthly. INVT GD200A (5.5-160 kW): European feature equivalent, P mode, PID with 8 presets, for any pump site. ABB ACQ80 (1.5-75 kW): a dedicated premium ABB series for water-pumping (Q in the name = water-rated), multi-pump out of the box, soft pipe-fill (smooth pipe pressurization without water hammer). Schneider Altivar 320 Solar (0.4-7.5 kW): solarized line for direct pump supply from solar panels without batteries, MPPT 200-820 V.

Before paying we clarify. First: pump type. Surface centrifugal: simplest case, V/f with PID. Borehole with frequent starts: sleep mode and dry-run protection required. Trunk with multiple pumps: multi-pump with rotation. Second: sensor. We ask what sensor the customer has (pressure, flow, level) and what signal (4-20 mA or 0-10 V), because the PID feeds from it. Third: water hammer. On long mains, soft pipe-fill is mandatory; otherwise fittings rupture within 1-2 years. 2-year warranty, 1-3 day delivery from our Kyiv warehouse.

Manufacturers in our stock

  • Veichi (AC70, AC310, SI23): universal mid-tier including SI23 solar line
  • INVT (GD200A): with P mode for pump duty and PID
  • ABB (ACQ80): dedicated water-pumping series, premium
  • Schneider Electric (Altivar 320 Solar, Altivar 630 for HVAC): Europe
  • Delta Electronics (VFD-CP2000 series, CP = compact pump): Taiwan

Frequently Asked Questions

The pump won't switch off even though pressure is reached — why?

Usually the sleep mode (PID sleep) is not configured. The logic: when the PID reaches the target pressure and the frequency drops below the sleep threshold, after a short delay the drive ramps to zero and «sleeps», then wakes as soon as pressure drops by a set delta. Typical values: sleep frequency 30-35 Hz (below that the pump gives no useful pressure and would only heat the water), wake delta 0.5-1.0 bar from setpoint. On Veichi AC310 this is the «Sleep function» group F13.29-F13.33 (sleep frequency — F13.30, wake threshold — F13.32). If the pump rapidly cycles on and off, also check the signal from the pressure sensor or switch.

What size expansion tank should I use with a VFD?

A small one — roughly 2-24 L. This is counterintuitive for those used to relay stations with 50-100 L tanks, but with a VFD the logic is different: the drive itself holds pressure via PID, and the tank only damps transients and water hammer. An oversized tank (100 L+) makes the system sluggish: pressure changes slowly, the PID lags real demand and holds the ±0.1 bar setpoint worse. If a large tank is already installed it is no disaster, but for new installs choose a compact diaphragm tank.

How do I protect a well pump from dry running with a VFD?

Through underload protection (by current drop). The physics is simple: when water runs out, the pump stops loading the motor and the running current drops sharply below normal — the VFD detects this and stops the drive before it spins «dry» and overheats. The threshold is set below the pump running current (roughly 30-50 %), with a small delay so it ignores brief dips. On Veichi AC310 this is the load-detection group: the level is parameter F10.33, the underload action is F10.32. It is also worth wiring a dry-run relay or level sensor into a digital input.

As pressure rises the pump speed rises too, though it should fall — how do I fix it?

This is inverted feedback: the PID «thinks» pressure is too low and pushes the speed up. The cause is wrong polarity or scaling of the 4-20 mA sensor. First check the sensor wiring at the analog-input terminals («+» and signal swapped). If the wiring is correct, invert the analog-input characteristic (the 4-20 mA curve) so that 20 mA corresponds to maximum pressure, not minimum; find the exact AI curve parameter in the analog-input settings group of your series. After inverting, make sure the PID runs with a direct feedback characteristic.