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Motor Controllers

Gateway Linking

How to connect the MX-3P to an HPzenAi gateway over RS485 and link it to the HPzenAi app, whether the gateway is panel-integrated or installed externally.

Section: Moto-X 3-Phase

What You'll Need​

Steps​

  • MX-3P module installed, powered on (12V DC), and three-phase mains supply restored to the starter panel.
  • HPzenAi gateway (GW-W1 Wi-Fi or GW-XR1 SIM/RF) available, whether integrated within the panel architecture or installed as an external gateway, and connected to the HPzenAi platform.
  • RS485 shielded twisted-pair cable (1.0 mm², 120 Ω matched) — pre-run from the MX-3P panel to the gateway.
  • HPzenAi app installed and logged in to your project account.
  • Modbus address of the MX-3P — factory default is Address 1.

RS485 Wiring to Gateway​

RS485 is a differential two-wire bus that supports multiple devices on the same cable pair. The MX-3P and the gateway share the A/B terminals; the RS485 link is required whether the gateway is integrated into the panel system or installed as an external gateway. All other HPzenAi RS485 devices can share the same bus.

Visual reference coming soon

Steps​

  • Run the RS485 shielded cable from the MX-3P panel to the gateway. Route away from 415V mains cables — minimum 100 mm separation or separate conduit.
  • At the MX-3P end: A core → RS485-A terminal; B core → RS485-B terminal. Connect shield drain to panel earth.
  • At the gateway end: A core → gateway RS485-A; B core → RS485-B. Leave shield floating at gateway end.
  • If MX-3P is the last device on the RS485 bus and the run exceeds 10 m: fit a 120 Ω termination resistor across RS485-A and RS485-B at the MX-3P end.
  • Each RS485 device must have a unique Modbus address. Set the MX-3P address using the selector inside the module cover before powering on if multiple devices share the bus.

RS485 Scan & Device Detection​

Steps​

  • Open the HPzenAi app and navigate to the gateway tile. Tap to open gateway settings.
  • Tap RS485 → Scan Devices. The gateway scans Modbus addresses 1–247.
  • The MX-3P appears in results as 'Motor Controller — MX-3P' or 'Motor Controller — MX-3P-SD' depending on the variant, with its Modbus address.
  • If not detected: confirm 12V DC LED is lit on the module, check RS485 A/B polarity (swap if needed), and verify no duplicate Modbus addresses on the bus.
  • Phase-loss status is read back from the module — the scan result shows current phase presence if all three phases are connected to the sense terminals.

Add Motor Controller to Your Project

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In the scan results, tap the detected MX-3P device

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Verifying the Connection​

Steps​

  • Confirm the motor controller tile shows Online (green) in the app.
  • Tap Manual Control → Start. The main contactor should click and the motor should run.
  • Check that the app shows running current and phase status in the device detail view.
  • Tap Stop and confirm the motor stops.
  • If the tile shows phase-loss alarm on first start: check that R, S, T sense wires are connected to the MX-3P phase sense terminals — without these wires connected the module cannot detect phase presence and may alarm immediately.
  • Runtime hours, phase status, and event history are available in Device → Status.