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Motor Controllers

Gateway Linking

How to connect the SP-3P-SD's built-in MX-3P-SD module to an HPzenAi gateway over RS485 and link it in the app, whether the gateway is panel-integrated or external.

Section: Starter 3-Phase Star-Delta

What You'll Need​

Steps​

  • SP-3P-SD assembly installed, 12V DC control power on, and three-phase mains supply available.
  • HPzenAi gateway (GW-W1 Wi-Fi or GW-XR1 SIM/RF) available, whether integrated within the panel arrangement or installed externally, and connected to the HPzenAi platform.
  • RS485 shielded twisted-pair cable pre-run from the SP-3P-SD enclosure to the gateway.
  • HPzenAi app installed on your phone and logged in to your project account.
  • MX-3P-SD Modbus address — factory default is Address 1.

RS485 Wiring to Gateway​

The built-in MX-3P-SD module exposes RS485-A and RS485-B terminals on the face of the SP-3P-SD assembly. The RS485 wiring process is the same as for other HPzenAi motor controller products, and the RS485 link is required whether the gateway is integrated into the panel arrangement or installed externally.

Visual reference coming soon

Steps​

  • Route RS485 shielded cable from the SP-3P-SD enclosure to the gateway in a dedicated low-voltage cable duct.
  • At SP-3P-SD end: A core → RS485-A terminal; B core → RS485-B. Shield drain → enclosure earth bar.
  • At gateway end: A core → RS485-A; B core → RS485-B. Shield floating at gateway end.
  • If the SP-3P-SD is the only or last device on the RS485 bus and the cable run exceeds 10 m, fit a 120 Ω termination resistor between RS485-A and RS485-B at the SP-3P-SD terminals.
  • Assign unique Modbus addresses if multiple devices share the same RS485 bus — use the address selector inside the MX-3P-SD module cover.

RS485 Scan & Device Detection​

Steps​

  • Open the HPzenAi app, tap the gateway tile, and open gateway settings.
  • Tap RS485 → Scan Devices.
  • The SP-3P-SD built-in module appears as 'Motor Controller — SP-3P-SD' with its Modbus address.
  • If not detected: confirm the MX-3P-SD LED is lit (12V DC power on), check RS485 A/B polarity, and confirm no duplicate Modbus addresses on the bus.
  • The scan result shows the current star-delta timer setting and phase status if phase sense wires are connected.

Add Star-Delta Starter to Your Project

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In scan results, tap the detected SP-3P-SD device

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Verifying the Connection​

Steps​

  • Confirm the starter tile shows Online (green) in the app.
  • Tap Manual Control → Start. Listen for the contactor sequence: main click → star click (star start) → [timer] → star release → delta click (delta run).
  • Confirm the motor accelerates during the star phase and smoothly transitions to full speed in delta.
  • In the app device detail view, confirm the sequence log shows: Main ON, Star ON → Star OFF, Delta ON.
  • If the motor stays in star and does not transition: set the star-delta timer to a longer value (Device Settings → Motor → Star-Delta Timer) and retry.
  • Runtime hours and sequence event log are available in Device → Status after the first successful start.