Application of digital intelligent tachometer

MSC-2B MSC-2A Intelligent Tachometer

1、 Introduction

Speed monitoring and protection device, equipped with resistance sensors, eddy current sensorsHEHall sensors and magneto electric sensors are used to monitor the rotational speed of the unit. The application of microprocessor chips for signal processing ensures accurate measurement, stable performance, and the ability to expand functions according to user needs. Rotating machinery, especially steam turbines, can experience a sudden increase in speedzuiA dangerous situation may lead to catastrophic consequences. It is extremely important to quickly pass the critical speed during the acceleration and deceleration measurement of the unit during start-up and shutdown, which is mainly suitable for monitoring and protecting the rotational speed of rotating machinery in industrial sectors such as power, petroleum, and chemical engineering. This device is highly intelligent, capable of full panel operation, suitable for long-term online monitoring, and does not require on-site maintenance.

2、 Application Fields

Monitoring and protection of shaft speed for rotating machinery such as steam turbines, water turbines, compressors, blowers, etc,Widely used in multiple industries such as electricity, petrochemicals, metallurgy, coal mining, and water conservancy.

3、 Function Description

1.Equipped with speed measurement display function,zuiBig speed measurement65000pmFive digit digital display.

2.Alarm function: When the measured speed exceeds any alarm setting value, the corresponding alarm indicator light on the front panel will light up, and a switch signal will be output on the rear panel to protect the monitored equipment.

3.The alarm value, number of teeth, and time can be set through the front panel buttons

4.Equipped with voltage and current output interfaces, it can be connected to computersDCSThePLCConnect devices such as paperless recorders to the system.

It is important to identify the relationship between vibration and rotational speed in the analysis of mechanical operating conditions. When designing centrifugal machines, the rotational speed operating range should be balanced with resonance, and the operating speed should not excite these special resonances of the machine. The data of machine start-up is important in determining the equilibrium resonance, which can be represented as the relationship curve between vibration amplitude and phase angle and machine speed. When depicting this curve and finding the relationship between these parameters, it is easy to determine the equilibrium resonance (critical resonance) of the machine

So when rotating machinery (such as steam turbines, fans, feed pumps, etc.) is running at high speeds, the speed must be kept as stable as possible. Once overspeed occurs, it may cause damage to the rotating equipment. Therefore, monitoring the speed is an important tool for high-speed rotating mechanical equipment

This device adds display, system fault identification, judgment, and control functions to the traditional transmitter base, effectively avoiding misoperation: it can monitor the rotation of gears, keys, and slots with different numbers of teeth.

I. Overview

The intelligent tachometer adoptsARMIntelligent speed monitoring and protection instrument as the core. This monitoring instrument has functions such as speed measurement, two-level alarm, overspeed protection, analog current output, and sensor fault monitoring. Suitable for monitoring and protecting the rotational speed of rotating machinery in industrial sectors such as power, textile, petroleum, and chemical. For example, monitoring and protecting the rotational speed of rotating machinery such as steam turbines, water pumps, fans, motors, compressors, etc.

2、 Input signal:

Magnetic reluctance speed sensor or Hall speed sensor

Waveform: sine wave or square wave pulse signal

3、 Function Description:

The measured value and alarm set value can be separately set atLEDDisplayed on the digital tube.

Alarm values can be freely set and modified.

When the alarm setting value is exceeded, the alarm indicator light will turn on, and at the same time, a switch signal will be output on the rear panel to protect the monitored equipment.

Alarm setting delay adjustment, range1-60Second, to prevent on-site interference from causing false alarms.

Maintain set parameters and other memory values during power outages.

Equipped with a current output interface, it can be connected to computersDCSThePLCConnect devices such as systems and paperless recorders.

4、 Electrical indicators:

External power supply:220VAC±10% 50HZ

Input signal: Reluctance speed sensor or Hall speed sensor

Waveform: sine wave or pulse

Amplitude:50mV-20VAC(Effective value)

range1-99999 rpm

Display mode: Five digits0.8inchLEDdigital display

Display accuracy: ±1 rpm（1-10000rpmScope)

±10 rpm（10000-99999rpmScope)

phototubeLEDIndication: On site operation status of the machine

齿数：1-255tooth

Current output:4-20mAActive, output load less than500Ω

Alarm point range:0-1full scale

Alarm Relay: Node Capacity7A/250VAC, normally open contact, sealing: epoxy resin

5、 Physical indicators:

plate-mounted

Overall dimensions:160×80×160mm

Hole size:152+1×76+1mm

Weight: Approximately1.5KG

wall-mounted

Dimensions: Width190X high290X thickness92（mm）

Installation size: Bottom170X high272（mm）

Weight: Approximately3KG

MSC-2B MSC-2A Intelligent Tachometer