Wilo

Role in our panels

How we use Wilo

The Wilo Stratos MAXO is a high-efficiency circulator pump with IE5 ECM (electronically commutated motor) technology. Available in DN25 to DN50 with power range 0.04–1.5kW, the Stratos MAXO achieves EEI (Energy Efficiency Index) below 0.20 and is ErP 2015 Lot 11 compliant. AUTOADAPT function continuously self-adjusts the pump curve to match actual system hydraulics without manual setpoint configuration. The 3.5-inch LCD display provides on-device status and configuration. The built-in differential pressure sensor eliminates the need for external ΔP transducers — flow rate is calculated from the pump curve and ΔP measurement. The IF-Module (Modbus RTU communication module) slides into the GENIbus expansion slot on the Stratos MAXO pump head without tools. Wiring uses RS-485 A/B/GND terminals on the IF-Module — standard RS-485 3-wire connection to the KNX/Modbus gateway. Modbus address is set via the pump display menu (Extras → Communication → Modbus address, range 1–31). Baud rate is fixed at 9600 baud, 8N1 configuration. For RS-485 bus termination, enable the termination resistor on the last device (120Ω via DIP switch on the IF-Module) when the Stratos MAXO is at the physical end of the RS-485 cable run. The Stratos MAXO Modbus register map provides comprehensive operational data: R1 = setpoint 0–100%, R3 = actual speed in RPM, R5 = current power consumption in W, R7 = differential pressure in kPa, R9 = calculated flow in l/h, R100 = alarm word (bitmask for fault types: overheat, blocked rotor, dry run, communication fault), R200 = cumulative energy counter in kWh. Write registers allow Modbus master control of pump setpoint when the pump is in Remote mode (set via display: Extras → Operating mode → Remote). The MDT SCN-MODBUS.01 KNX/Modbus gateway (RS-485 master, up to 31 slaves, 9600 baud) maps Stratos MAXO registers to KNX group addresses via a signal table configured in ETS6. Typical KNX GA assignments: power consumption (DPT 9.001 2-byte float, kW) for BREEAM energy sub-metering, actual speed percentage (DPT 5.001) for BMS display, fault status (DPT 1.001) for maintenance alarm, and cumulative energy (DPT 13.010 4-byte signed, kWh) for energy dashboard. Predictive maintenance logic in ETS6 or Gira HomeServer triggers a KNX alarm when pump power exceeds nominal by 15% — indicating bearing wear or flow restriction requiring service.

Modbus RTU integration via IF-Module — pump speed, power, differential pressure, flow, and fault status mapped to KNX group addresses for HVAC hydraulic monitoring and BREEAM energy sub-metering.