A constant pressure water supply system uses a pressure transducer, PID-capable VFD, and PLC to maintain stable pipe-network pressure regardless of demand — delivering 20–50% energy savings versus fixed-speed pumping, with no water tower and no secondary pollution. Automation Liberty supplies the complete BOM (Kinco KC100 VFD with built-in CPS PID, Kinco PLC, IoT HMI) ex-stock from Shenzhen — no vendor lock-in, no licence fees.
Used in residential complexes, hotels, hospitals, factories, agricultural irrigation, and municipal pump stations. Designed for engineers, OEMs, and integrators who need a complete, vendor-independent water-supply package.
Pump-skid manufacturers shipping booster sets to end users in EU / MENA / LATAM.
Replacing legacy Siemens / ABB / Schneider drives with shorter lead times and lower TCO.
Building turnkey municipal pump stations with remote monitoring and SCADA integration.
Retrofitting old water-tower systems in mid- and high-rise residential buildings.
The legacy method: an underground pool feeds a roof water tower that gravity-supplies each tap. Common in older sub-high-rise buildings.
Constant pressure variable frequency: 3–4 main pumps + 1 standby + small auxiliary pump for night-time low demand. No roof tank.
Both the pressure setpoint and feedback signal connect directly to the master VFD. The PID algorithm runs entirely inside the KC100 — no external PID controller required.
Inline 4–20 mA transducer continuously measures pipe-header pressure.
Master VFD compares feedback to setpoint (e.g. 0.4 MPa) and computes error.
If pressure < setpoint, frequency increases. If pressure > setpoint, frequency decreases.
When master at 50 Hz and pressure still low, a slave starts. At zero flow, all pumps sleep.
┌───────────────────┐ ┌──────────────────┐ ┌────────────┐
│ Pressure Sensor │──4-20mA──▶│ KC100 Master VFD │─3φ─▶│ Pump 1 │
│ (pipe header) │ │ PID + Vector │ │ (variable) │
└───────────────────┘ └────────┬─────────┘ └────────────┘
│ RS-485
▼
┌──────────────────┐ ┌────────────┐
│ KC100 Slave VFDs │─3φ─▶│ Pumps 2–6 │
│ (auto-rotation) │ │ (variable) │
└──────────────────┘ └────────────┘
│ Modbus TCP / 4G
▼
┌──────────────────┐
│ Kinco IoT HMI │ → Cloud / BMS / SCADA
│ GL2070E2 / MK070 │
└──────────────────┘
One KC100 master runs the lead pump on PID; up to 5 slave KC100 units engage on demand. Auto-rotation ensures even wear.
Each motor has its own KC100 VFD. Often more economical for small systems where wiring is the dominant cost.
Honest note: above ~30 kW per pump, master–slave wins on hardware cost. Below 7.5 kW per pump, one-to-one usually wins on installed cost. Send us your pump curve and we'll model both.
Most distributors hide BOMs behind RFQ forms. We don't. Below is a working 4-pump constant-pressure system, fully buyable. Typical FOB Shenzhen price: $4,800–$12,000 depending on power range and IoT options.
0.75–630 kW · 3-phase 380/480 V · sensorless vector · built-in CPS PID
Modbus RTU/TCP · 24 DI / 16 DO · expandable I/O · IEC 61131-3
7" touchscreen · Ethernet · 4G/Wi-Fi optional · cloud monitoring
IP65 · stainless steel diaphragm · G1/4 thread
CAN ↔ Ethernet · Modbus RTU ↔ TCP · BMS integration
The KC100 is a universal, precision-type, high-performance vector frequency converter with a built-in constant pressure water supply PID algorithm. It is not a generic VFD with PID added on — it ships with a pump-tuned wizard that asks for only the pressure range, sensor type, and pump count, and configures the rest automatically.
A 14-year-old Russian water-treatment specialist serving 150+ enterprises across the Russian Federation and CIS — including natural gas, oil, and railway companies.
Replace the legacy FDP-series float-relay-contactor control on industrial water-treatment plants with a modern, compact, microprocessor-based system supporting both manual and automatic operation.
Kinco K506-24AR PLC + GL2070E2 7" Ethernet HMI, with custom control algorithms, mimic diagrams, and equipment schematics for the FDP-30 flotation unit.
If your existing system is built on any of the drives or PLCs below, you can migrate drop-in to Kinco for a typical 30–50% hardware-cost reduction and 2–7 day lead times.
Honest note: Kinco does not replace high-end multi-axis EtherCAT motion stacks (Siemens S7-1500 + S210 servo, Beckhoff TwinCAT). For pump, fan, and HVAC applications below 630 kW with PID, master–slave, or BMS integration, it is a direct functional substitute.
Booster pump sets for 8–40 floor buildings; replaces water towers and saves rooftop loading.
Stable shower / sterilization pressure across all floors with night-time auxiliary pump for low demand.
Cooling tower make-up, boiler feed water, process rinsing — Russian water-treatment case (above).
Variable demand drip / sprinkler systems with sensor feedback and remote 4G monitoring.
Booster stations for district water networks with SCADA integration over Modbus TCP.
Pairs with cooling towers and chillers — see /solutions/heat-exchange/ for the full HVAC stack.
The answers procurement, integrators, and engineers ask most often.
Send us your pump count, kW rating, and target pressure. We'll return a full BOM, wiring schematic, and FOB Shenzhen quote within 24 hours.
Or call our engineering line: see /contact for regional numbers (US · EU · APAC).