The Pepperl+Fuchs NJ15+U1+DW1-10, 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.

Housing Architecture & Variant Nomenclature

• NJ: Non-contact inductive proximity sensor technology platform.

• 15: 15 mm nominal sensing distance capability (embeddable).

• U1: Varikont standard rectangular surface-mounting terminal enclosure.

• DW1: Integrated frequency evaluation and rotational speed monitoring circuit.

• -10: Higher adjustable frequency monitoring range variant (10 Hz to 100 Hz evaluation window).

Technical Performance Parameters

Internal Filtering and System Protective Isolation

Integrated filtering suppresses high-voltage supply transients across noisy industrial networks. The Varikont housing ensures high DIN-rail mounting stability when paired with external mounting adapters, ensuring strict surge voltage protection limits are maintained while keeping protocol conversion latencies and signal conversion delays to a minimum when connecting with downstream intrinsic safety (Ex i) barriers.

Delivered Package Items

• 1 x Pepperl+Fuchs NJ15+U1+DW1-10 Inductive Speed Monitor Assembly

• 1 x Varikont Base Terminal Box Mount

• 1 x Technical Installation Guide

Field Setup & Cable Connections

Target Distance and Positioning

Position the rectangular sensor head directly over the rotating metallic target wheel or keyway. Keep the gap strictly within the 15 mm operating window to ensure complete pulse detection.

Terminal Chamber Wiring

Unscrew the Varikont top housing cover to reveal the internal screw connection terminals. Pass shielded control wires through the cable gland and attach to the designated supply and output terminals.

Frequency Setpoint Tuning

Rotate the internal potentiometer to set the frequency threshold between 10 Hz and 100 Hz. The output contact remains energized as long as the pulse frequency exceeds this selected setpoint.

Frequently Asked Questions

• How does the -10 variant differ from the standard -1 frequency speed monitor?

  The -10 variant evaluates a higher frequency window (10 Hz to 100 Hz / 600 to 6000 RPM) compared to lower frequency models.

• What output reaction occurs when shaft speed drops below the setpoint?

  The output contact de-energizes into a fault state after the internal response delay elapses following an underspeed condition.

• Is an integrated start-up bypass timer included in the sensor circuit?

  An adjustable start-up delay timer ignores underspeed states during initial drive startup, permitting motor acceleration up to operational speed.

• Can the orientation of the sensor head be adjusted on site?

  The Varikont head can be manually rotated into 5 different positions relative to the base enclosure to align with incoming targets.

• What power supply range is required for proper operation?

  The universal power interface accepts wide-range AC or DC supply voltages without requiring manual jumper adjustments.

• What wire size can be attached to the internal screw terminals?

  The terminal strip accommodates solid or flexible conductors up to 2.5 mm square cross-sectional area.

• How should cable shielding be grounded in high EMI areas?

  Earth the cable shield at the main panel earth bus bar to prevent induced electromagnetic noise from causing false speed readings.

• What ingress protection level does the assembled housing provide?

  When correctly assembled and tightened, the Varikont terminal housing achieves an IP67 rating against dust and liquid ingress.