NDD3 series intelligent monitoring motor protector

Short Description:

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Product Detail

Product Tags

◆ Protected contact capacity: AC250V/7A, AC380V/5A, contact life ≥10 5 times.
◆ Overvoltage protection: when the working voltage exceeds the overvoltage setting value, the operation time is ≤10S.
◆ Undervoltage protection: when the working voltage is lower than the set value of undervoltage, the operation time is ≤10S.
◆ Off-phase protection: when the three-phase current, arbitrary – phase no current, the action time ≤2S.
◆ Lock-in protection: when the power current reaches 5 times of the rated current or above, the operation time is ≤1S.
◆ Dc4-20ma current output accuracy: 0.3% (20mA corresponds to twice the set value)
◆ Current display accuracy ≤1.5%.

Product overview

Microcomputer intelligent monitoring motor protector (referred to as monitor), is the company’s scientific and technological personnel according to the market needs, adopt user Suggestions in the support of scientific research units to assist, combined with the application principle of single chip computer, the use of foreign new PIC single chip microcomputer, compared with similar products, the technology has gone up a level.It is convenient to digital, intelligent, networked, site monitoring, total anti-interference ability, high precision, stable and reliable work, design the end phase, overload, locked-rotor, short circuit, owe flow, overvoltage, undervoltage, electric leakage, three-phase imbalance protection, and has a current digital display, such as monitoring, intelligent, and other functions, with M type has a DC4-20 a analog signal output, can be directly with the secondary instrument used in industry or computer system interface, with T can monitor remote communication interface between RS485 and RS232 and PC machine, network monitoring system composed of PLC,The system can modify the parameters of the monitor protection and monitor the running state in time, remotely control the start and stop operation of the motor, and inquire the historical data, etc. It is the most ideal electric motor protection product at present.Widely used in metallurgy, chemical industry, textile, petroleum, mining, cement and other automation industries.

The main features

1.EPROM storage technology is adopted to realize parameter electrical setting. After power is dropped, set parameters are thrown to save, and no setting is required.
2, the application of computer and digital processing technology, so that the measurement accuracy is high, good linearity, fault resolution accurate and reliable, anti-interference ability is strong, and has the diagnosis function.
3. The monitor adopts LED display or LCD display for various fault operation status.
4, equipped with RS485 serial digital interface, convenient for digital communication with upper computer (PC).Support modBus-RTU,PROFI Bus-DP protocol.
5. With dc4-20MA analog signal output function, it can be directly connected with industrial secondary instruments or computer systems.
6. Multi-purpose machine can replace ammeter, voltmeter, thermal relay, current transformer, time relay and leakage relay, etc.
7. Easy to install, plate type, guide type, device type installation, can be installed interchangeably with JR16, JR36 and other thermal relays, or can be installed on the guide

.Model and Specification

Description of selection:

◆ Example 1: NDD3-S 50AZML AC220V
◆ For LED display, current specification 10-50A, suitable for 5.5-22KW motor power, integral, with analog dc4-20MA output, with leakage protection function, working voltage AC220V
◆ Example 2: NDD3-Y 100AFTL AC380V
◆ LCD display, current specification 20-100A, suitable for 30-45KW motor power, split type, with communication function, with leakage protection function, working voltage AC380V
◆ Note: The motor greater than 75KW can be protected by 400A and 600A to monitor the secondary current of the motor. Three current transformers with A variable ratio of 5A should be provided for the selection, and the no-load current should be greater than 1.5A.

The main function

1. No more than 2500 meters above sea level.
2. Ambient temperature: -30℃-+65℃
3, air relative humidity: at +25℃ not more than 85%, the internal monitor is not suitable for frost, ice.
4. Atmospheric conditions: there is no explosive hazard medium, and no corrosive metal, insulator and conductive dust.
5. Where there is no rain or snow.
6. Where there is no violent vibration or impact.
7, 380, 660VAC three-phase asynchronous motor, feeder circuit protection.
8. Rated working voltage of the monitor: AV220V, AV380V,50HZ allowable deviation ±20%.(Other voltage classes can be customized)

 Operation instructions

  1. Operating sequence

    Display of interest

    Code definition

    Set introduction

    The first time set key

     

    Rated current code

    Units: A

    Current setting value

    The second time set key

     

Start time code
Scope: 1-99
Start time set value
The Third time set key

Over current
time code
0-999
Over current
time parameter
The fourth time set key

Underload
current code
Units: A
Underload
current setting value
The fifth time set key

Over voltage setting
Units: V
The sixth time set key

Undervoltage setting
Units: V
The seventh time set key

Auxiliary
function setting
Scope: 1-999S
The eighth time set key

Leakage current code
Scope: 1-999mA
Current setting value
The ninth time set key

Mail address code
Scope:0-255
Mail address set value
The tenth time set key
The voltage display
Return

2、Fault code display

LCD panel schematic diagram and operation instructions

1.Operation instructions

Operating sequence

Display of interest

Code definition

Set introduction

The voltage display

     
 

The first time set key

 

Rated current code

Units: A

Current setting value

The second time set key

 

Motor Start time code
1-99s
Start time set value
The Third time set key

Overcurrent time curve code
0-999
Over current time setting value
The fourth time set key

Underload code
Units: A
Underload setting
The fifth time set key

Overvoltage code
Units: V
Overvoltage setting
The sixth time set key
Undervoltage code
Units: V
Undervoltage setting
The seventh time set key

Auxiliary
function setting
0-999S
The eighth time set key

Leakage current code
1-999mA
Current setting value
The ninth time set key

Mail address code
0-255
Mail address set value
The tenth time set key
The voltage display
Return

2、Fault code display

External structure, installation dimension and wiring

Construction and Mounting Dimensions (Type A)

 

Construction and Mounting dimensions (Type B)

 

 

 


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