Megger CM500 Bedienungsanleitung

User Guide

CM500

Multi-Function Installation Tester

Safety Warnings 3

Initial Setup 4

General Description 6

Features, Controls and Connections 8

Operation 10

Backlight 10

Auto shut-off 10

Switched probe SP2 10

Checking Earth Potential 10

Voltage and Frequency Measurement 10

Polarity Indication 11

Determining Phase Sequence 12

Continuity Testing and Low Resistance measurement 12

Test Lead Resistance Nulling 12

Low Resistance Continuity measurement 13

Continuity Bleeper 13

Low input resistance voltmeter 13

5ΩThreshold 13

Insulation Testing and High Resistance measurement 14

Loop Impedance Measurement 15

Bonded Metalwork Testing 16

Prospective Short Circuit Current (PSCC) 17

PFC measurement accuracy 17

Earth Loop Resistance measurement at 15 mA 17

RCD Testing 18

No Trip Tests 20

Trip Tests 20

Auto Sequence RCD Test 22

Earth Resistance Measurement 24

Earth Electrode Resistance Measurement 24

Condition and Warning Indication 26

Test Results, Storage, Deletion and Retrieval 27

Serial Cable Connections 30

Specification 31

Accessories 35

Publications 36

Basic and Service Error calculation 37

Repair and Warranty 39

Symbols used on the instrument

Caution: Refer to accompanying notes

Equipment protected throughout by

Double or reinforced Insulation (Class II)

Equipment complies with current EU

Directives

Complies with IEC / EN 61557

Contents

SAFETY WARNINGS

QSafety Warnings and Precautions must be read and understood before the instrument is used. They must be observed

during use.

QThe circuit under test must be switched off, de-energised and isolated before test connections are made when carrying

out insulation and continuity tests.

QContinuity of protective conductors and earthed equipotential bonding of new or modified installations must be verified

before carrying out an earth fault loop impedance test, or RCD test.

QCircuit connections and exposed metalwork of an installation or equipment under test must not be touched.

QDo not move the rotary selector switch position while a test is in progress.

QThe LCD ‘neon’ voltage indicators cannot reveal a Neutral - Earth reversal.

QAfter insulation tests, capacitive circuits must be allowed to discharge before disconnecting test leads.

QThe instrument should not be used if any part of it is damaged.

QTest leads, probes and crocodile clips must be in good order, clean and with no broken or cracked insulation.

QU.K. Safety Authorities recommend the use of fused test leads when measuring voltage on high energy systems.

QReplacement fuses must be of the correct type and rating.

NOTE

THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS

Read this page before using the CM500.

Your CM500 has been set up as shown on the label on the

front of this User Guide:-

The first line gives the setting, which modifies the way the

instrument behaves.

The second line gives the printer report language. This may be

Language 1, which is English, or Language 2 which is the

language noted on the third line of the label.

Instrument Setup

The instrument setup mode allows you to change the setting, the

printer speed and the printer report language.

To display the current setup modes:-

1. Press and hold the backlight key,then turn the rotary

selector switch from the from ‘OFF’position to the ‘RCL’

position. The code (printer speed) is displayed.

2. Release the backlight key.

3. Toggle the Ikey to scroll through and display the current

setup modes. as follows:-

To change the Printer speed

1. Toggle the Ikey to scroll through and display the

code.

2. Press the SAVE key. The current speed setting is

displayed.

3. Toggle the RCL keys until the required speed setting is

displayed.

4. To save the new setting, press the SAVE key. The bleeper

sounds and is displayed. To abort the new setting, press

the EXIT key. is displayed.

To select the Printer language

1. Toggle the Ikey to scroll through and display the

code.

Initial Setup

2. Press the SAVE key. The current printer report language is

displayed as 1(English) or 2(as given on the type label on

the previous page).

Note:- Language 2can be changed using the CM500 Setup

Disk supplied.

3. Toggle the Ikey until the required language setting is

displayed.

4. To save the new setting, press the SAVE key. The bleeper

sounds and is displayed. To abort the new setting,

press the EXIT key.is displayed.

To select the Setting

1. Toggle the Ikey to scroll through and display the

code.

2. Press the SAVE key. The current setting is displayed as A

(Continental Europe) or b(U.K.).

3. Toggle the Ikey until the required setting is displayed.

4. To save the new setting, press the SAVE key. The bleeper

sounds and is displayed. To abort the new setting,

press the EXIT key.is displayed.

CM500 Setup Disk

The program on the disk enables the second printer language to

be changed into any of the separate languages. The program

may be run directly from disk. Connect the PC to the instrument

via a serial lead.

for DOS type: a:\cm500set and press: Return.

for Windows™ 3.1 or 3.11:

1. From the Program Manager options, select: File

2. From the options given, select: Run.

3. Type: a:\cm500set and press: Return.

For Windows™ 95:

1. Select the Start menu.

2. Select the Run option.

3. Type: a:\cm500set and press: Return.

Follow the instructions given by the program.

The MEGGER CM500 Multi-function Installation Tester is a

compact instrument designed to perform all of the functions

required by the electrical contractor to fully test domestic,

commercial and industrial wiring. Specially designed to comply

with U.K., European and other International wiring regulations

and standards, the CM500 may be used on all single and three

phase systems with rated voltages up to 300 Volts a.c. rms to

earth/ground.

Measured values are indicated on a large backlit analogue/digital

LCD and may also be stored in internal memory for later recall to

the display, direct printing via a standard serial printer, or

downloaded to a PC for storage, analysis and report generation.

The CM500 is supplied as standard in a protective test and carry

case, and with the necessary mains plug lead and 2-wire lead set

required to commence testing. Optional accessories include the

SP2,a2-wire lead set with test switch built into one of the probes

providing remote operation, and a 5 metre 2-wire lead set for

increased accessibility.

Key Features

•No Trip loop Impedance test

•Storage of test results in memory

•Direct serial printer driver output

•RS-232 Output for PC storage

•Recall stored results to the display

•RCD Ramp test function

•Analogue arc and digital display.

•Selectable backlight

•Optional switchable probe (SP2)

Test Capability

• Insulation

Test voltages of 250V, 500V and 1000V.

• Continuity testing

Fast bleeper

Test lead resistance nulling

Automatic polarity reversal (Setting A)

• Loop Testing

Operates regardless of mains polarity (Setting A)

Two wires only needed for testing

Automatic test start on voltage detection

Direct indication of short circuit current.

Phase - phase, phase - neutral & phase - earth tests

Simple earth electrode test

•RCD Tests

Tests selective (delayed) general and d.c. sensitive RCDs.

Two wires only needed for testing

Contact voltage and loop resistance displayed.

Selectable test current for programmable devices

• Supply voltage and frequency measurement

• Phase sequence indication

• Mains outlet polarity indication

Application

The CM500 may be be connected live to earth or between live

conductors of systems that have a rated voltage of 300V a.c. rms

to earth and an installation (overvoltage) Category III or lower.

This means that the CM500 may be connected to any fixed

wiring of a building installation, but not to primary supply circuits

such as overhead cables. To maintain user safety and ensure

accurate measurements, only use the test leads supplied or

General Description

recommended for use with this instrument.

The CM500 is fuse protected to 440V 10kA. The maximum

current which could flow through this fuse in the case of a fault is

limited to 10 kA by the impedance of the test leads. There is a

fuse accessible in the battery compartment which protects the

Insulation and Continuity range. If warning of a ruptured fuse is

given during a test, and if the warning symbol is present when

attempting to carry out an insulation test with the test leads

shorted together, this fuse must be replaced by another fuse of

the same type and rating i.e. 500 mA (F) 500 V H.B.C. 10 kA.

Fuse Replacement

To replace the fuse, disconnect the test leads,switch the

instrument Off and with a screwdriver, loosen the captive screw

holding the battery compartment cover in place. Remove the

cover. Depress the fuseholder slightly, and turn a quarter turn

anti-clockwise to release. Remove the holder and replace the

fuse with one of the correct size and rating. Relocate the fuse

holder,depress and turn a quarter turn clockwise. Replace and

re-secure the cover.

Battery Replacement

When the low battery symbol appears, the cells are nearly

exhausted and should be replaced as soon as possible. When

the battery is exhausted, the instrument will not perform tests

and the cells must be replaced. Use Alkaline cells IEC LR6 (AA)

or 1,5 V nickel cadmium cells only.

To install or replace the cells, disconnect the test leads,switch

the instrument Offand loosen the captive screw holding the

battery compartment cover in place. Remove the cover,lift out

and disconnect the battery holder to access the cells. Ensure

that the replacement cells are fitted with the correct polarity,in

accordance with the symbols on the battery holder moulding.

Carefully re-connect the battery holder to the plug, replace the

battery holder in the compartment, and re-secure the cover.

Remove the cells if the instrument is not going to be used for any

extended period of time. Stored results are retained when the

battery is disconnected.

Test Leads

All test leads form part of the measuring circuit of the instrument

and must not be modified or changed in any way,or be used with

any other electrical instrument or appliance. The power cord

supplied with the CM500 is a test lead that forms part of the

measuring circuit of the instrument. The overall length of this lead

must not be altered. If the power cord plug is not suitable for your

type of socket outlets, do not use an adaptor. You may change

the plug once only by cutting the cord as close to the plug as

possible and fitting a suitable plug.

The colour code of the cord is:

Earth (Ground) Yellow/Green

Neutral Blue

Phase (Line) Brown

Note: A plug severed from the power cord must be destroyed, as

aplug with bare conductors is hazardous in a live socket outlet.

Incorrect battery cell polarity

can cause electrolyte leakage,

resulting in damage to the

instrument.

Features, Controls and Connections

Press Iand TYPE key to:

• Select test parameters

• Enter test result identification

Auto Shut-off

Operates after 5 minutes of

inactivity by the instrument

(30 seconds in Bleeper mode)

Turn Rotary Selector Switch to:

• Select test position

• Select Download (RCL)

• Select ‘OFF’

Press TYPE key to:

• Select test voltage (MΩ)

• Select type of RCD

• Delete data (in combination

with Ikey)

Insulation test positions

Continuity test position

VAR test selection

Push TEST button to:

• Initiate the selected test

• Repeat selected test

Touch finger to Earth Test Pad to:

•Check potential between the Earth

connection and your finger

Press key to:

• Display other test results

Press and hold key to:

• Save test results

RCD test selection

Backlight key

Continuity Bleeper position

Lead resistance null

position

Recall / Download position

‘OFF’ position

150mA 40ms test selection

Loop test selection

Fuse

Ruptured

Low Battery

voltage indication

3Phase

sequence

RCD Test

Selection

RCD Type

Selection

Lead resistance

null ‘On’

Over / Under

Range

Excessive

Noise

Single Phase

Polarity indication

Plug polarity

Thermal

Trip operated

Touch button -

Earth >100 V.

CM500 Display

CM500 Connections

Backlight

The display backlight gives a clear display of measurements in

poor lighting conditions. The backlight will briefly operate when

the CM500 is switched on. To switch the backlight on, press the

key. Press the key again to switch the backlight off.

To conserve battery power, the backlight will automatically switch

off after a period of 15 seconds (if the battery voltage is low, this

period is automatically reduced).

Auto Shut - Off

To extend battery life and reduce unnecessary drainage, the

CM500 uses advanced battery management techniques,

switching functions off when they are not required. For example,

if an external voltage of 25 V or less is applied, no value is

displayed unless the backlight is switched on. After a period of

inactivity by the instrument, the CM500 will switch itself off,

preceded by a series of bleeps. Toswitch the instrument back

on, press any key.

Switched Probe SP2

This is an accessory which can be used anywhere that the 2-wire

lead set is specified in this User Guide. The press button probe

duplicates the function of the TEST key on the instrument,

allowing quick and easy testing.

Checking Earth Potential

To quickly distinguish live and earth, this feature provides display

indication if a voltage greater than 100 V exists between the

earth connection and your finger.

1. In any switch position except OFF,RCL and (Ω),

connect the earth connection (black for the 2-wire lead

set, green for the 3-wire lead set) to earth.

2. Touch a finger to the metal pad on the front panel. This

is safe and will not endanger you.

3. If a voltage greater than 100 V exists between the finger

(normally at earth potential) and the earth wire, the

warning symbol is displayed.

Voltage and Frequency Measurement

The CM500 will display the supply voltage and frequency in all

switch positions except (Ω),RCL and OFF.The DISPLAY

key will alternate between voltage and frequency.

Power plug connection

1. Insert the power cord plug into an installation socket.

2. Supply voltage and polarity are displayed.

3. Press DISPLAY to alternate between supply voltage and

frequency.

2-wire lead set connection

If an installation socket is not available, use the 2-wire lead set.

1. Connect the red and black leads to the two conductors to

be tested.

2. Voltage between the leads and polarity are displayed.

Note:- Though displayed, when using the 2-wire test set, ‘neon’

Operation

The SP2 probe test key circuit is hazardous live

during a test. It is safe in normal use.

Continuity of the SP2 probe non replaceable fuse must be

confirmed (by testing in the Bleeper range) before making any

measurement.

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