AVM AVM-NK Detection and Protection Relay AC380V 50/60HZ 1PCS

Engineer's Quick Brief

• Comprehensive Phase Protection: Continuously guards against phase loss, incorrect phase sequence (reversal), and severe voltage unbalance in high-power systems.
• Standard AC 380V / Dual Frequency Compatibility: Formulated explicitly for three-phase industrial main power grids running on 380V AC at 50Hz or 60Hz configurations.
• Critical Asset Preservation: Provides instant fault isolation tracking to prevent localized thermal burnout across three-phase induction motors, water pumps, compressors, and CNC spindles.

AVM AVM-NK Three-Phase Detection & Protection Relay Overview

The AVM AVM-NK is an industrial-grade, multi-functional three-phase phase monitoring and protection relay designed to preserve the operational safety of low-voltage electrical distribution networks. Engineered to handle continuous main grid lines rating at AC 380V across both 50Hz and 60Hz supply frequencies, this control terminal continuously evaluates line symmetry. By integrating precise analog measurement windows, the AVM-NK detects critical phase failure, asymmetric line loading, and voltage supply drops. In the event of a power anomaly, the unit switches its internal hardwired electromechanical relay contacts, opening the control sequence of upstream magnetic contactors to safely isolate sensitive equipment downstream.

Technical Specifications

Industrial Application Matrix

Koeed Field FAE Tool: Three-Phase Voltage Unbalance & Motor Derating Simulator

When deploying the AVM-NK relay, line voltage symmetry is crucial for downstream motor life. Enter the measured true RMS phase-to-phase voltages below to calculate the exact voltage unbalance percentage based on NEMA guidelines and review estimated load derating requirements.

Field Commissioning & Troubleshooting Guide

Q: What are the typical terminal block connections for the AVM-NK relay?

While terminal labeling follows international low-voltage routing conventions, standard integration circuits require splitting inputs into verification nodes and control logic nodes:

• L1, L2, L3 (or R, S, T): Primary phase input measuring terminals. Wire these directly downstream from your primary circuit breaker to monitor true line voltage.
• Common (COM), Normally Open (NO), Normally Closed (NC): Auxiliary contact loops. To build a standard self-protecting starter circuit, route your contactor's 110V/220V/380V coil power line through the COM and NO terminals. When line parameters are normal, the relay energizes to close this path, enabling regular machinery operation.

Q: The relay shows a red fault LED immediately upon panel installation, and the machinery cannot start. How is this corrected?

An immediate fault state during initial installation typically points to installation configuration issues rather than hardware failure. Follow this troubleshooting sequence:

1. Check Phase Rotation Order: The AVM-NK includes an integrated phase sequence detector. If incoming power lines are misaligned (e.g., L1-L3-L2 instead of L1-L2-L3), the unit locks out operation to prevent motors from running in reverse. Isolate power and swap any two input wires (e.g., swap the connections on L2 and L3) to reset the correct phase sequence.
2. Measure Line Voltage Asymmetry: Use a digital multimeter to measure all three phase-to-phase combinations (L1-L2, L2-L3, L3-L1). If any line drops significantly below the 380V specification, the module will interpret the voltage drop as a phase loss condition and remain in protection mode.
3. Confirm Control Loop Continuity: Ensure that wire terminations inside the screw clamp blocks are securely tightened onto raw copper, preventing high-resistance connection drops.

Q: Does the module reset automatically once a line fault clears?

Yes. The AVM-NK series features automatic reset logic. Once abnormal line fluctuations drop back within acceptable engineering tolerances, the internal measurement logic executes a brief stabilization delay before re-energizing the output contacts. This design eliminates the need for manual manual intervention inside sealed electrical enclosures after transient grid brownouts.

Cross-Reference Guide

The AVM AVM-NK 380V configuration serves as an alternative layout or substitute component for these common industrial monitoring modules:

• Schneider Electric Phase Match: RM35TF30 / RM17TG00 Monitoring Series (Provides matching 3-phase phase sequence and phase failure tracking parameters).
• Omron Industrial Equivalent: K8AK-PM1 380-480VAC Series (DIN-rail layout alternative; verify contact arrangement definitions during cross-over loop wiring updates).
• Carlo Gavazzi Cross: DPA01CM40 Series (Compact 3-phase monitoring equivalent built with matching SPDT electromechanical changeover outputs).