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What You'll Need
- 1MX-3P module installed, powered on (12V DC), and three-phase mains supply restored to the starter panel.
- 2HPzenAi 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.
- 3RS485 shielded twisted-pair cable (1.0 mm², 120 Ω matched) — pre-run from the MX-3P panel to the gateway.
- 4HPzenAi app installed and logged in to your project account.
- 5Modbus address of the MX-3P — factory default is Address 1.
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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.
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- 1Run 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.
- 2At the MX-3P end: A core → RS485-A terminal; B core → RS485-B terminal. Connect shield drain to panel earth.
- 3At the gateway end: A core → gateway RS485-A; B core → RS485-B. Leave shield floating at gateway end.
- 4If 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.
- 5Each 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.
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RS485 Scan & Device Detection
- 1Open the HPzenAi app and navigate to the gateway tile. Tap to open gateway settings.
- 2Tap RS485 → Scan Devices. The gateway scans Modbus addresses 1–247.
- 3The MX-3P appears in results as 'Motor Controller — MX-3P' or 'Motor Controller — MX-3P-SD' depending on the variant, with its Modbus address.
- 4If 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.
- 5Phase-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.
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Link in HPzenAi App
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
- 1Confirm the motor controller tile shows Online (green) in the app.
- 2Tap Manual Control → Start. The main contactor should click and the motor should run.
- 3Check that the app shows running current and phase status in the device detail view.
- 4Tap Stop and confirm the motor stops.
- 5If 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.
- 6Runtime hours, phase status, and event history are available in Device → Status.