The Pepperl+Fuchs NJ15+U1+DW1-1, also cataloged as the NJ15+U1+DW1 Inductive Speed Monitor, operates as a dedicated hardware component for rotational speed evaluation and rotational underspeed monitoring within industrial drive networks.

Model Designation & Suffix Logic

• NJ: Inductive proximity sensor base technology.
• 15: 15 mm nominal operating distance threshold.
• U1: Varikont rectangular surface-mountable terminal housing style.
• DW1: Integrated speed monitor function block with adjustable frequency evaluation range.
• -1: Specific contact output arrangement and terminal internal revision code.

Technical Performance Parameters

Network Signal Isolation and Protective Interface Compliance

Integrated filtering electronics suppress transient voltage line spikes across industrial control loops. The rigid Varikont housing maintains high DIN-rail mounting stability when using accessory brackets, ensuring surge voltage protection limits remain effective while keeping protocol conversion latencies and signal propagation delays negligible when interfacing with downstream intrinsic safety (Ex i) barriers.

Included Package Contents

• 1 x Pepperl+Fuchs NJ15+U1+DW1-1 Inductive Speed Monitor Unit
• 1 x Varikont Base Terminal Box Mounting Assembly
• 1 x Instruction Leaflet Sheet

Installation Directives & Mechanical Mounting

Physical Alignment

Mount the rectangular sensor head facing the metallic target wheel or shaft keyway. Maintain the target clearance within the specified 15 mm sensing window.

Electrical Terminal Wiring

Remove the upper housing cover to access internal screw terminals. Wire operational power and load control contacts through the cable gland using shielded control cables.

Frequency Setpoint Tuning

Adjust the internal potentiometer to define the lower frequency threshold for underspeed detection. Ensure the target passage rate exceeds the set point during steady-state rotation.

Frequently Asked Questions

• How does the sensor evaluate shaft rotational speed?

  Internal electronics calculate pulse frequency generated as metal targets pass the sensing face, triggering the output if speed drops below setpoint.

• What happens to the output contact when the shaft stops rotating?

  The output contact switches to its de-energized fault position when pulse frequency drops below the configured setpoint value.

• Does the device feature a start-up delay override period?

  An integrated start-up delay timer bypasses underspeed tripping during drive acceleration to allow equipment to reach nominal RPM.

• Can the terminal housing head orientation be repositioned?

  The sensing head can be rotated relative to the terminal base block in multiple directions to align with target movement.

• Is direct connection to standard AC supply voltages supported?

  Universal power circuitry accommodates broad AC and DC operating supply ranges without requiring external line conversion transformers.

• What wire gauge range fits into the internal terminal chamber?

  Internal screw terminals accept solid or stranded conductors up to 2.5 mm square cross-sectional area with cable gland sealing.

• How should cable shielding be terminated for high-noise areas?

  Ground cable shields at the control panel ground bus bar to prevent electrical noise coupling into the frequency detection circuit.

• What IP enclosure protection rating applies to this housing assembly?

  Properly torqued housing screws and sealed cable glands provide IP67 ingress protection against water and particulate intrusion.