SKZS-05F Forward and Reverse Rotation Monitor

# 1. Overview

In most operating scenarios, the shaft of a machine rotates in a single direction, so only the forward rotational speed of the machine needs to be monitored. However, during certain machine operations such as startup and shutdown, the rotor may rotate in the reverse direction unexpectedly. Such sudden malfunctions can inflict extremely severe damage on the equipment. Therefore, reverse rotation detection and emergency shutdown protection are also indispensable components of condition monitoring.

The intelligent reverse tachometer identifies reverse shaft rotation and triggers protective measures simultaneously with mechanical rotational speed monitoring. It receives phase signals from two rotational speed sensors and compares them to determine the rotation direction, integrating both rotational speed measurement and reverse rotation protection functions.

The instrument receives input signals from two rotational speed sensors. The probes of non-contact sensors are radially mounted with a proper clearance at the shaft protrusions, grooves or speed measuring gear discs, facing the sensing targets directly. The two sensors are installed at a certain included angle, and there are specific application requirements for the module, tooth count and tooth distribution of the machine’s speed measuring disc or measuring gear.

# 2. Main Functions

1. Intelligent processing: Parameters including range value, alarm threshold and tooth count can be set via physical buttons.

2. Equipped with alarm, danger and reverse rotation alarm functions; statuses are indicated by panel indicator lights, and relay outputs are available via wiring terminals.

3. Adjustable alarm delay ranging from 0 to 60 seconds to avoid false alarms caused by on-site interference.

4. Current output terminals proportional to rotational speed values are arranged on the rear panel for recording signal output.

# 3. Technical Specifications

- External Power Supply: 220VAC, 50Hz, 100mA

- Input (12VDC power supply for external sensors; specify special voltage requirements when placing orders if needed)

  Supported signal types:

  1. Two-channel eddy current sensors

  2. Two-channel Hall sensors (with built-in pull-up resistors)

  3. Two-channel integrated Hall sensors (with built-in pull-up resistors)

  Waveform: Square wave

  Input Impedance: >10KΩ

- Measuring Range: -9999 ~ 9999 rpm

- Display

  Display Mode: 4-digit 0.8-inch LED digital display

  Display Accuracy: ±1 rpm

  Phototube LED Indicators: Normal, Alarm, Danger, Reverse Rotation

- Applicable Tooth Count: 3 teeth (with two independent sensors) or arbitrary number of teeth (with dedicated reverse rotation speed sensors)

- Current Output: Active 4~20mA, maximum output load ≤500Ω

- Alarm Point Range: 0~100% full scale, accuracy ±0.1%

- Relay Sealing: Epoxy resin encapsulation, contact capacity 7A/240VAC, normally open contacts

- Temperature Range

  Operating Temperature: 0℃ ~ +65℃

  Storage Temperature: -30℃ ~ +80℃

- Relative Humidity: Up to 95% (non-condensing)

- Overall Dimensions: 160*80*160mm

- Panel Cutout Dimensions: 152±1 × 74±1 mm