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Motor Controllers

Configurations

Overload relay setup, phase-loss protection, dry-run protection, scheduling, and alert configuration for the SP-3P.

Section: Starter 3-Phase

Overload Relay Setup​

Setting the built-in overload relay FLA correctly is essential. An incorrectly set overload relay is the leading cause of both motor damage (set too high) and nuisance trips (set too low) in three-phase motor installations.

Steps​

  • Locate the motor FLA (Full Load Amperes) on the motor nameplate — labelled 'A', 'FLA', 'I', or 'Rated Current' at the rated voltage (415V).
  • Set the FLA dial on the SP-3P overload relay section to the motor nameplate FLA.
  • Do NOT set the dial to the supply MCB rating or the contactor Ie rating — use the motor nameplate value only.
  • If the motor has a Service Factor (SF) > 1.0, the overload relay can be set up to SF × FLA.
  • After commissioning, verify actual running current with a clamp meter on each phase — all three phases should read within 5% of each other and within 10% of nameplate FLA.

Phase-Loss Protection​

Steps​

  • Phase-loss protection is active by default once R, S, T sense wires are connected to the MX-3P phase sense terminals.
  • Configure trip delay at Device Settings → Motor → Phase Loss Delay (default: 2 seconds). In areas with frequent momentary supply dips, increase to 5 seconds to avoid nuisance trips.
  • After a phase-loss trip, the motor will not restart automatically — reset the fault latch in the app at Device → Reset Fault before restarting.
  • Phase imbalance warning: configure threshold at Device Settings → Motor → Phase Imbalance Threshold. Sustained imbalance above 5% is logged as a warning even if no phase is fully lost.

Motor Protection Settings​

Steps​

  • RESTART DELAY: Device Settings → Motor → Restart Delay. Recommended: 60 seconds for three-phase induction motors to allow full deceleration before re-start.
  • RUNTIME LIMIT: Device Settings → Motor → Max Runtime. Motor stops and alerts if this run time is exceeded without a stop command.
  • FAULT LATCH: Enable to require manual app reset after any hardware trip (overload relay, phase loss, dry-run). Prevents automatic re-start onto a faulty mechanical load.

Dry-Run Protection​

Steps​

  • Requires an HPzenAi LS-PRE level sensor in the water source, linked to the same gateway.
  • Automation → Add Rule → Trigger: Level Sensor Low → Action: Stop Motor [SP-3P name].
  • Optional restart rule: Trigger: Level Sensor Restored → Wait 5 minutes → Action: Start Motor (allow bore to recover).
  • Set a dry-run confirmation delay on the rule to avoid false trips from momentary sensor fluctuations: Trigger: Level Low → Wait 2 minutes → Stop.
  • Test by simulating Level Low in the app — confirm the SP-3P stops the motor within the configured delay.

Scheduling & Alerts​

Steps​

  • Device → Schedules → Add Schedule. Set Daily or Weekly with Start Time and Stop Time.
  • PHASE LOSS ALERT — set to High priority: Device → Alerts → Phase Loss Alert → Priority: High.
  • OVERLOAD TRIP ALERT: Device → Alerts → Fault Alert. Sent when the overload relay trips and motor stops unexpectedly.
  • DRY-RUN ALERT: Sent when level sensor triggers a dry-run stop.
  • OFFLINE ALERT: Device → Alerts → Offline Alert. Configure timeout (recommended: 5 minutes).
  • All alert events and phase status readings are logged in Device → Event Log.