MEWOI MEWOI3800P User Manual Download Page 6

Page: 6 / 21

-2-

II. Technical Specifications

Function

Return circuit grounding resistance on-line

monitoring, metal return resistance connection

online monitoring, grounding condition moni-

toring, ground wire and metal cable anti-theft

monitoring.

Power Supply

Detector: DC6V~ DC9V, 50ma Max.

Resistance

Range

0.01Ω ~ 200Ω

Resolution

0.001Ω

Indication

Range

0.00Ω ~ 200Ω

Accuracy

±2% rdg±3dgt(20

°C

± 5

°C

, below 70%RH)

Detector Di-

mensions

110mm

80mm

55mm

PCB Dimen-

sions

166mm

56mm

20mm

Grounding

Wire Perfora-

tion Size

60mm×30mm, closed mode

Overflow Indi-

cation

When show value is beyond 200Ω, detector

send out “OLΩ”

PCB Interface

J1: signal output, power supply input interface

J2: Detector and PCB interface

J1 Identifier

P+: power supply input anode;

P-: power supply input cathode;

GND: signal cathode, connects with power

supply input cathode by short circuit connec-

Summary of Contents for MEWOI3800P

Page 1: ...Built in Non Contact Ground Resistance Online Detector MEWOI3800P ...

Page 2: ......

Page 3: ...CONTENT I Brief Introduction 1 II Technical Specifications 2 III Detector Structure and Dimensions 4 IV Usage method 5 V The Principle and Application of Detection 6 VI Basic Equipment 14 ...

Page 4: ... to increase assistance after the ends of the earth form a loop then install detector Note that this detector specified measuring range and using the environment Protection against rain shower and water logging of installation The detector and the circuit board can be built into other equipment crate which is convenient for integration Install waterproof and rainproof of device at outdoors The dis...

Page 5: ...terface provides standard MODBUS RTU communication pro tocol The detector and the circuit board can be built into other equipment crate which is convenient for secondary development integration Non Contact Grounding Resistance Online Detector is widely applied in electric power telecommunications petrochemical rail way meteorology military and other industries building facilities electric power el...

Page 6: ...01Ω Indication Range 0 00Ω 200Ω Accuracy 2 rdg 3dgt 20 C 5 C below 70 RH Detector Di mensions 110mm 80mm 55mm PCB Dimen sions 166mm 56mm 20mm Grounding Wire Perfora tion Size 60mm 30mm closed mode Overflow Indi cation When show value is beyond 200Ω detector send out OLΩ PCB Interface J1 signal output power supply input interface J2 Detector and PCB interface J1 Identifier P power supply input anod...

Page 7: ... Black power supply input cathode Blue RS485 signal anode Grey RS485 signal cathode White analog grounding power supply input cathode can connects with analog grounding by short circuit connection Protocol Standard RS232 RS485 or MODBUS RTU communi cation protocol Quality Detector 680g Working Tem perature And Humidity 20 C 55 C 20 RH 90 RH Humiture Er ror Within 5 Shift Automatic shift GND Interf...

Page 8: ...equirements The circuit board need built into other equip ment crate avoid rain and water logging Power Supply Mode External power supply Equipped by user III Detector Structure and Dimensions 1 Grounding wire perforation size 66mm 36mm 2 Detector 3 Signal output power supply input thread 4 Signal output and power supply input connecting wire 5 Detector and PCB connecting wire ...

Page 9: ...V Usage method 1 Independent Installation and Use 2 Set up Network Installation and Use According to RS232 RS485 or MODBUS RTU communication protocol to set up a variety of networks to achieve remote monitor ing ...

Page 10: ...l overhead line s resistance connection re sistance contact resistance between grounding down lead and metal overhead line B spot grounding resistance For the formative above mentioned return circuit s grounding system Detector can be installed directly for monitoring if the grounding system not form a return circuit it need adding auxiliary grounding electrode to form a return circuit further ins...

Page 11: ...out metal return circuit resistance s value is very small general speaking only few of an Ohm this is the connection resistance of metal return cir cuit namely equipotential resistance isn t grounding resistance Therefore the Detector is convenient to test metal return circuit s connection resistance and also applied in anti theft monitoring for ground wire and metal cable When the cable is cut me...

Page 12: ... connection position of grounding down lead and grounding grid direction of arrow of the welding position in the picture engineering reform is to excavate grounding down lead s position then again weld grounding down lead Actually it s impossible to reform the whole grounding grid or the whole grounding grid and surface facilities need to pull down and rebuild this is impossible Therefore for the ...

Page 13: ...rounding down lead together on the ground to form a return circuit then install the Detector to monitor 5 Three point method As figure A is the tested ground pole B and C are auxiliary ground poles Ground pole A B and C are connect together on the ground In the grounding down lead of the three ground pole A B and C install the Detector respectively can accurately test the grounding resistance of A...

Page 14: ...liary ground pole B and C must less than 10 times of the grounding systems engineering standard value If the engineering requirements of the grounding resistance value cannot exceed 4Ω then RC 40Ω RB 40Ω RB RC as small as possible more can improve measured grounding system 6 Application 1 Power Transmission System Pole Ground Connection It forms multipoint grounding system through overhead ground ...

Page 15: ...ound Connection Respectively primary grounding electrode R R1 R3 Rn is a inde pendent grounding body under the ground don t connect together are multipoint grounding system convenient to test Detector is in stalled on the primary grounding electrode the Detector s indication is Rr R R1 R2 R3 Rn If the more part grounded junctions are so R1 R2 R3 Rn 0 then Rr R It s the four code cable in the pictu...

Page 16: ...onnection Generator Room and Launch Tower is independent outdoors gener ally connect both together to form second return circuit then install detector as the picture below It also can add 2 auxiliary ground poles use the three point method to monitor ...

Page 17: ...nding resistance in accordance with single point grounding sys tem direct installation test return circuit resistance can judge grounding connection condition For the large scale construction grounding grid it is to monitor its equipotential value of grounding condition between grounding down lead and grounding network If problems occur it would be located at the connection point between grounding...

Page 18: ...est the grounding resistance and connect resistance of the facility shows below No Item Technical Speci fication 1 Grounding resistance of oil storage tank 10Ω 2 Grounding resistance of load or unload place 10Ω 3 Grounding resistance of Fuel dis penser 4Ω 4 Resistance of oil hose which connect to the Fuel dispenser and fuel truck nozzle 5Ω VI Basic Equipment Detector 1Set ...

Page 19: ... 15 PCB module 1PCS Connecting wire 1 Set User s Manual Warranty Manual Certification 1 Set ...

Page 20: ... 16 ...

Page 21: ... 17 Your Testing Specialist ...

Search results

Summary of Contents for MEWOI3800P

Reviews:

MEWOI MEWOI3800P, User Manual, Page: 6 / 21

Search results

Summary of Contents for MEWOI3800P

Reviews: