Megger MGFL 100 Manuale utente

MGFL 100

Ground fault locator

5 Commonwealth Ave

Woburn, MA 01801

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

MGFL100

The information presented in this manual is believed to be adequate for the intended use of the product. If the product

or its individual instruments are used for purposes other than those speciﬁed herein, conﬁrmation of their validity

and suitability must be obtained from Megger. Refer to the warranty information below. Speciﬁcations are subject to

change without notice.

WARRANTY

Products supplied by Megger are warranted against defects in material and workmanship for a period of two years

following shipment. The warranty is void in the event of abuse (failure to follow recommended operating procedures)

or failure by the customer to perform speciﬁc maintenance as indicated in this manual.

Valley Forge Corporate Center

2621 Van Buren Ave

Norristown, PA 19403-2329

610-676-8500 (Telephone)

610-676-8610 (Fax)

Contents

Section Description Page

1.0 Introduction ..............................................................................................................................................4

1.1 Purpose of Manual .................................................................................................................................4

1.2 Audience...................................................................................................................................................4

1.3 Items received ..........................................................................................................................................5

2.0 Safety ........................................................................................................................................................6

3.0 Technical speciﬁcations ...........................................................................................................................7

4.0 Connections and Controls ......................................................................................................................9

4.1 Transmitter connections .........................................................................................................................9

4.2 Transmitter controls and displays ..........................................................................................................9

4.3 Receiver connections...............................................................................................................................10

4.4 Receiver controls and displays................................................................................................................10

5.0 MGFL100 Operations ..............................................................................................................................10

5.1 Locating a fault on ungrounded DC systems.......................................................................................12

5.2 Locating a ground fault on IT grounded systems................................................................................13

5.3 Locating a ground fault on TT grounded systems ..............................................................................20

6.0 Setting voltage and current limits.........................................................................................................25

7.0 Replacement parts...................................................................................................................................26

8.0 Maintenance ............................................................................................................................................27

8.1 General .....................................................................................................................................................27

8.2 Receiver Battery Replacement ...............................................................................................................28

8.3 Transmitter Battery Replacement..........................................................................................................28

9.0 Sales and Manufacturing Sites...............................................................................................................29

Table of contents

MGFL100 3

Section 1.0 Introduction

Thank you for your purchase of the Megger MGFL100 Ground Fault Locator. Be assured that your unit has been

designed with emphasis on reliability, simplicity and ease of use. It will provide you with the information you need to

locate various types of ground faults.

Section 1.1 PURPOSE OF THIS MANUAL

This document is the operator manual for the Megger MGFL100 Ground Fault Locator. It provides a description of the

operation of the unit as well as installation and operating instructions. Read this manual before installing or using the

equipment. Special emphasis should be placed on all safety discussions.

Section 1.2 AUDIENCE

This manual is written for technical personnel who are familiar with the various measurements performed by volt

meters and current meters and have a general understanding of their use and operation. Such personnel should also be

thoroughly familiar with the hazards associated with the use of this equipment and should have received proper safety

training.

If you ﬁnd any discrepancies in the MGFL100 or have any comments, please send them to Megger via fax, e-mail or

phone.

Megger

Valley Forge Corporate Center

2621 Van Buren Avenue

Norristown, PA, 19403

Attn: Customer Service

MGFL100

1.0 Introduction

Section 1.3 Items Received

Qty Description Image

1 MGFL100 Transmitter

1 MGFL100 Receiver

1 Transmitter Output Cable

1 Current Clamp (CT)

1 Sync Cable

Optional Capacitive Pick Up

Optional Active mini CT NEED CLASS 3 PRODUCT

Optional AC Filter NEED CLASS 3 PRODUCT

Section 1.4 Overview

The MGFL100 is a ground fault locator that is intended to be used to locate ground faults up to 400K ohms on online

ungrounded DC systems. With use of the optional AC Filter the MGFL100 can also be used to locate ground faults up

to 400K ohms on online IT grounded AC systems. The MGFL100 receiver can also be placed in a mode that will allow it

to trace 60Hz and 50Hz currents on TT grounded systems with ground faults.

www.megger.com MGFL100 5

1.3 Items received

Section 1.5 Deﬁnitions

This section deﬁnes the terms used throughout this manual.

Term Deﬁnition

Impedance The AC and DC components of the ground fault on the circuit being measured, when the sync

cable or Capacitive Pick Up is not used. When the sync cable or Capacitive Pick Up are used the

term will refer to the actual resistance (The DC component only) of the ground fault on the circuit

being measured.

Capacitance The leakage capacitance present in the circuit being measured.

Fault Current The current delivered by the transmitter, used for tracing the fault.

Reactive Current The portion of the fault current drawn by the capacitive portion of the circuit.

Transmitter The part of the MGFL100 that provides the fault current and the direct measurement of the

resistance and capacitance of the circuit.

Receiver The part of the MGFL100 that measures the fault current and reactive current of the circuit.

Capacitive Pick

The accessory that when connected between the receiver and the circuit being measured allows

the receiver to measure the reactive current of the circuit.

Sync Cable The cable that is connected between the transmitter and receiver that allows the receiver to

measure the reactive current of the circuit, without the need for the Capacitive Pick Up

CT The current transformer or current clamp that connects to the receiver.

Active Mini CT A battery powered miniature current clamp used to measure the fault current. This miniature

current clamp ﬁts in tight locations and on small wires.

AC Filter Box The ﬁlter box that is placed between the transmitter and the IT grounded AC system. The box

blocks the AC current from damaging the transmitter.

Section 2.0 Safety

Warnings and Safety Precautions

WARNING!

Death, serious injury, or ﬁre hazard could result from improper use/installation of this instrument. Read

and understand this manual before installing this instrument.

Installation of this instrument MUST be performed in compliance with the National Electric Code and any additional

safety requirements applicable to your installation.

Installation, operation and maintenance of this instrument MUST be performed by qualiﬁed personnel only. The

National Electrical Code deﬁnes a qualiﬁed person as one familiar with the construction and operation of the

equipment and the hazards involved.

Safety Precautions

The following safety precautions MUST be taken whenever the instrument is installed.

Wear safety glasses and insulated gloves when making connections to power circuits

Hands, shoes, ﬂoor/ground must be dry when making any connection to a powered line

These warnings and safety precautions are to be used where appropriate when following instructions in this manual.

MGFL100

1.5 Deﬁnitions

CAUTION!

The equipment could be impaired from improper use. Read the complete manual before use.

WARNING!

The equipment should not be used while its battery door is removed or if there is any visible damage

to the case or if the hardware holding the unit together has been loosened.

Section 3.0 Technical Speciﬁcations

SPECIFICATIONS REFERENCE 25ºC (77ºF)

TRANSMITTER

Working Voltage 600 VDC max using fused test leads.

Output Voltage Range 0.0 to 50.0 V RMS

Output Frequency 5.12 Hz

Output Current 0 to 160 mA RMS

Output Power 5 Watts

Display LCD, TN, Positive, Reﬂective Size: 0.4” high digits Format: Seven

segment with decimal points Digits: 3.5

DC Voltage Measurement Range 0.0 VDC to 600 VDC

Accuracy ±5% of reading ± 2 Least Signiﬁcant Digits

Speed of Measurement < 3 seconds

Display Resolution 0.0 VDC to 199.9 VDC / 200 VDC to 600 VDC Auto-ranging

Resistance Measurement Range 0.0 kΩ to 400 kΩ

Resolution 0.1 kΩ (< 175.0 kΩ), 1 kΩ (> 199.9 kΩ)

Accuracy (±10 ± 280 x RC) % ± 1 Least Signiﬁcant Digit

Speed of Measurement < 3 seconds

Display Resolution 0.0 kΩ to 199.9 kΩ / 199.9 kΩ to 400 kΩ Auto-ranging

Capacitance Measurement Range 0.00 μfd to 19.99 μfd

Resolution 0.01 μfd

Accuracy ±20% ± (.0027 / R) fd ± 1 Least Signiﬁcant Digit

Speed of Measurement < 3 seconds

AC Voltage Measurement Range 0.0 V RMS to 50.0 V RMS

Resolution 0.1 V RMS

Accuracy ±5% of reading ± 2 Least Signiﬁcant Digit

Speed of Measurement < 3 seconds

AC Current Measurement Range 0.0 mA RMS to 160 mA RMS

Resolution 0.1 mA RMS

Accuracy ±5% of display ± 2 Least Signiﬁcant Digit

Response time < 3 seconds

Voltage limit Password protected programmable from 0 to 50V

Current limit Password protected programmable from 0 to 160mA

Battery Type Four Li-Ion Protected Cells (18650)

Run Through Time Up to 4 hours

Charge Time < 8 hours

Battery Status Indication LED, Red / Amber / Green

MGFL100 7

3.0 Technical speciﬁcations

RECEIVER

Visual Alarm Range Selectable - 30% / 40% / 50% / 60% / 70% of reference.

Audio Alarm Range Selectable - 30% / 40% / 50% / 60% / 70% of reference.

Receiver Filter Range Selectable 5.12Hz or 50 / 60Hz

Save Saves Total Current, Resistive Current and Reactive Current

Recall Recalls Total Current, Resistive Current and Reactive Current

Display LCD, TN, Positive, Reﬂective Size: 0.4” high digits, Format: Seven

segment with decimal points, Digits: 3.5

Resistive Current Measurement Range 0.00 mA to 160 mA

Resolution 0.01 mA (< 19.99 mA), 0.1 mA (> 19.99 mA)

Accuracy ±5% of reading ± 0.01 x IC ± 2 Least Signiﬁcant Digits

Speed of Measurement < 3 seconds

Capacitive Current Measurement Range 0.00 mA to 160 mA

Resolution 0.01 mA (< 17.50 mA), 0.1 mA (> 19.99 mA)

Accuracy ±5% of reading ± 0.01 x IR ± 2 Least Signiﬁcant Digit

Speed of Measurement < 3 seconds

Battery Type Six AA alkaline cells. (Eveready EN91, or equivalent).

AC Power Adapter 90 to 264Vac 47 – 63Hz.

Run Through Time Up to 4 hours

Battery Status Indication Visual: LED, Red / Amber / Green

PHYSICAL

Transmitter Size 36.1 x 30.5 x 19.5 cm (14.2” x 12.0” x 7.65”)

Transmitter Weight 6.00 kg (13.2 lbs). (with batteries installed)

Receiver Size 22.1 x 10.4 x 5.1 cm (8.7” x 4.1” x 2.0”)

Receiver Weight 1.00 kg (2.2 lbs) (with batteries installed)

ENVIRONMENTAL

Operating Temperature -10°C to +50°C.

Storage Temperature -20°C to 60°C

Humidity 95% Relative Humidity, Non-Condensing

IP Rating 51 when closed

ALTITUDE

<2000 meters 600V CAT IV

2000-4000 meters 600V CAT III / 300V CAT IV

SAFETY

Insulation

Safety Standard IEC61010

CAT Rating IV @ 600V

STANDARDS COMPLIANCE

Conducted EMI Immunity IEC 61000-4-6 at 3V (150kHz to 80 MHz) Performance Criterion A

Radiated EMI Immunity IEC 61000-4-3 at 10V/m (80 MHz to 1 GHz), 3V/m (1.4 GHz to 2.0 GHz)

and 1 V/m (2.0 GHz to 2.7 GHz) Performance Criterion A

ESD Immunity IEC 61000-4-2 with 4 kV contact discharges and 8 kV air discharges.

Performance Criterion B

Conducted EMI Emissions When operating

using external power adapter

CISPR 11 Group 1 class A.

Radiated EMI Emissions CISPR 11 Group 1 class A.

MGFL100

3.0 Technical s[peciﬁcations

Shock MIL-STD-810G method 516.6

Drop test MIL-STD-810G method 516.6

Static Rigidity IEC 61010-1 section 8.2.1

Impact IEC 61010-1 section 8.2.2

Vibration MIL-STD-810G method 514.6 Annex C

Loose Cargo MIL-STD-810G method 514.6 category 5.

*Full Accuracy Speciﬁcation guaranteed 0ºC to 50ºC

Section 4.0 Connections and Controls

Section 4.1 Transmitter Connections

Section 4.2 Transmitter Controls and Displays

Battery String Connections

Red to positive side of string

Green to earth ground

Black to negative side of string

Safety Earth

Connection

Capacitive Sync Connection

Battery Compartment

AC - DC Power

Adapter

Positive Voltage and

Resistanve Display

Negative Voltage and

Capacitance Display

Negative Output

ON/OFF

Current Output

Display

Voltage Output

Adjust

Voltage Output

Display

Power

ON/OFF

Positive Output

ON/OFF

MGFL100 9

4.0 Connections and controls

Section 4.3 Receiver Connections

The current clamp plugs into the CT inputs.

The sync cable will plug into the “SYNCH” input.

Section 4.4 Receiver Controls and Displays

Battery test button:

Press to view the status of the

receiver batteries. (Red should be

replaced)

IT indicator: When lit this indicates the

displayed value is total current.

Alarm indicator: Lights when the receiver

locates the circuit with the fault.

Save LED: Lights during save operation.

Power On / Off: Press button to

power the unit on and off.

Function button: Press button to

deactivate the low pass ﬁlter in

order to trace 50/60Hz current. Recall button: Press to recall saved values.

Alarm knob: Selects alarm level

and audio / visual alarm.

Save button: Press to save values displayed

on screens.

Section 5.0 MGFL100 Operations

Section 5.1 Locating ground faults on ungrounded DC systems

MGFL100

4.3 Receiver connections

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