Megger MIT510 Manuale utente

MIT510

5kV Digital Insulation Tester

USER MANUAL

GSAFETY WARNINGS

■The circuit under test must be switched off, de-energised, isolated and checked to be safe before insulation test connections are made. Make sure the

circuit is not re-energised whilst the instrument is connected.

■Circuit connections must not be touched during an insulation test.

■After completing a test, capacitive circuits must be completely discharged before disconnecting the test leads.

■Turning the instrument off, and manually discharging circuits on completion of tests is recommended as standard procedure, before touching the test

leads.

■It is rare, but in certain circumstances, breakdown of the circuit under test may cause a loss of display, presence of HV on the test leads will still be shown

by a flashing red LED. If this happens, stop the test immediately by pressing the ‘TEST’or ‘Power ON/OFF’button then ensure the circuit is manually

discharged before touching any connections.

■Test leads, including crocodile clips, must be in good order, clean and with no broken or cracked insulation.

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

■Water on the surface of the instrument may lead to erroneous results. It is recommended that the instrument is not used in wet weather conditions.

■This instrument is not intrinsically safe and must not be used in hazardous atmospheres.

NOTE

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

Symbols used on the instrument are:

FCaution: risk of electric shock

GCaution: refer to accompanying notes

tEquipment protected throughout by Double

Insulation (Class II)

cEquipment complies with current EU directives.

CONTENTS

Description 4

Power lead and charging the batteries 4

Quick start 5

Instrument controls and indicators 6

Power On/Off button 6

V▲and V▼buttons 6

Test button 6

Ω/I button 6

Bbutton 7

“HV On” LED 7

“Charging indicator” LED 7

Test terminals 7

The guard terminal 7

Factory programming socket 7

Battery bar graph 8

Voltage at terminals 8

Timer 8

Digital display 8

Analogue display 8

Capacitance display 9

Time constant 9

Specification 9

Accessories 11

Repair and Warranty 12

If the power lead supplied is not suitable for your type of mains outlet, do

not use an adaptor. Always use a power lead fitted with the correct plug.

NB:Aplug severed from the power lead is a hazard if plugged into a live

socket. Severed plugs must be destroyed immediately.

The instrument is fitted with a two-pin IEC60320 power inlet. Most power

leads are made with three-core cable so the ground connection will not

be used.

Power lead cable colour coding:

International USA

Earth/Ground Yellow/Green Green

Neutral Blue White

Live (Line) Brown Black

If using a fused plug ensure it is fitted with a 3 Amp fuse.

The instrument can be powered from 95 - 240 V rms, ±10% 50/60Hz.

With power connected the battery will charge as long as a test is not in

progress. The Power On/Off button has a green LED which illuminates

when mains power is present.

For best battery lifetime, charge the battery after each use. A completely

exhausted battery will take 14 hours to recharge.

INTRODUCTION POWER LEAD AND CHARGING

The MIT510 is a compact microprocessor controlled high voltage d.c.

insulation tester, powered by internal rechargeable battery or mains

supply. A comprehensive LCD display shows resistance, current,

capacitance, voltage and timer measurements digitally, with resistance

being shown in analogue as well.

Features include:

■Resistance or current measurement- front panel selectable

■Resistance measurement range - 10 kΩto 15 TΩ

■Front panel selectable test voltages - 250 V, 500 V, 1000 V, 2500 V, 5000 V

■Incremental timer (minutes & seconds) – measures during test

■Load capacitance measurement – displayed at end of a test

■LCD backlight – front panel selectable

■Battery level/charging indicator

■Mains (line) input presence LED

■High voltage warning flashing LED shows when greater than 50 V

present on test leads

■High voltage warning LCD "flash" shows when greater than 50 V

present on test leads

■8hours continuous testing on full charge.

8. Tostop the test press TEST button.

9. Timer will stop.

10. Analogue display shows insulation resistance.

11. Digital display shows resistance or current selected by pressing Ω/I

button.

12. Load capacitance will be calculated and displayed after the end of

the test.

13. Time-constant will be displayed after the end of the test.

1. Check connections to load - see SAFETY WARNINGS

2. To turn on, press Power On/Off button and release after display

responds. The instrument first will perform a self-check during which

Ini is displayed. After Ini disappears the instrument is ready for use.

3. Check voltage at terminals display to be sure the load is safe to

energise.

4. Set test voltage required with V▲and V▼buttons.

5. To start a test, press TEST button and release after red LED shows. If

external voltage at terminals <50 V, testing starts.

6. TEST button red LED and display warning symbols will flash during a

test to show high voltage present at terminals.

7. Timer will count up from zero during test.

Voltage at terminals

Battery level

Warning

voltage at

terminals

Digital

display

Timer

Analogue

display

Warning

voltage at

terminals

Capacitance display

Time constant

INSTRUMENT CONTROLS AND INDICATORS

Power On/Off button:

The instrument will only turn on if this button is pressed, held and then

released after the display responds.

If pressed and released before the display responds the instrument will

not turn on.

If pressed and held continuously the instrument will not turn on.

This sequence is a safety feature to prevent the instrument inadvertently

turning on.

Topower the instrument down at any time, press Power On/Off again.

The instrument will also power down after 10 minutes of inactivity.

Once powered, the display will first show Ini while it does a self-check.

When Ini disappears, the instrument is ready for use.

V▲and V▼buttons:

Using these buttons one of five test voltages can be selected: 250 V,

500 V, 1000 V, 2500 V or 5000 V. The selected voltage is shown on the

display.

If there is an external voltage greater than 50 V on the test leads the

display will show this voltage instead. The instrument will not do a test if

this is the case.

After a test has started, the display shows the voltage on the test leads

only.If the test voltage is changed during a test, the new test voltage will

be displayed briefly before the display again shows the voltage on the test

leads.

After a test has been stopped, the display shows the test voltage selected

once the load has discharged to below 50 V.

TEST button:

Atest will only start if this button is pressed, held and then released as

soon as the red HV LED lights. When the test starts the red HV LED flashes

and the display flashes the HV warning symbols.

If pressed and released before red LED shows a test will not start.

If pressed and held continuously the instrument will immediately stop the

test.

This sequence is a safety feature to prevent the instrument inadvertently

starting a test.

If an external voltage greater than 50 V is present on the test leads, this

will be shown by the red HV LED and the display HV warning symbols

flashing. Testing will be disabled until this voltage falls below 50 V.

Testing will stop if the TEST button is pressed again.

After a test has finished, the instrument will discharge the load which may

take some time. Always check the load has been discharged before

touching the test leads.

Ω/I button:

Pressing this button toggles the digital display between the insulation

resistance and current.

across the insulation between the bare cable and the external sheathing

due to the presence of moisture or dirt. Where it is required to remove

the effect of this leakage, particularly at high testing voltages, a bare wire

may be bound tightly around the insulation and connected via the third

test lead to the guard terminal ‘G’.

The guard terminal is at the same potential as the negative terminal. Since

the leakage resistance is effectively in parallel with the resistance to be

measured, the use of the guard causes the current flowing through surface

leakage to be diverted from the measuring circuit. The instrument

therefore reads the leakage of the insulator,ignoring leakage across its

surface.

Factory programming socket:

This is a 9 pin socket under the hinged cover and is not for customer use.

Bbutton:

Pressing this button toggles the display backlight on and off.

"HV On" LED:

This is a red LED next to the TEST button on the front panel. As long as

there is a voltage greater than 50 V, from an internal or external source, on

the test inputs, the LED flashes.

"Charging Indicator" LED:

This is a green LED next to the Power On/Off button on the front panel.

When mains power is present it shows green.

Test Terminals:

There are three test terminal marked +, - and G. These terminals are

designed to accept only the test leads supplied. Shutters across the

terminals prevent accidental ingress of dirt and other objects. Test lead

plugs interlock with the shutters and are released by rotating the test lead

plug a quarter turn.

The Guard terminal is explained below and only used in cases where

surface leakage currents need to be eliminated. Most measurements use

just the + and – terminals. The instrument’s internal voltage generator

drives the + terminal with respect to the – terminal, current being

measured in the – terminal.

The Guard Terminal:

For basic insulation tests and where there is little possibility of surface

leakage affecting the measurement, it is unnecessaryto use the guard

terminal i.e. if the insulator is clean and there are unlikely to be any adverse

current paths. However in cable testing, there may be surface leakage paths

Voltage at Terminals:

When not testing, the voltage displayed is the test voltage previously

selected.

If there is an external voltage greater than 50 V present, this will be

displayed regardless of changes made to the test voltage. In this case the

instrument will not do a test, the TEST button red LED and display

warning symbols will flash to warn of the hazard until the external voltage

becomes less than 50 V.

When testing, the voltage displayed is the voltage present at the test

terminals of the instrument.

If the test voltage is changed, by pressing either of the V▲and V▼

buttons during a test, the new test voltage is displayed momentarily before

the voltage at the test terminals is displayed again.

Timer:

The timer shows minutes and seconds. At the start of a test the timer will

startfrom zero and at the end of a test it will stop. The duration of the last

test remains on the display until another test is started.

Digital Display:

The digital display shows the resistance or current being measured during

a test. The Ω/Ibutton toggles between the two. After a test the display

shows the last measurement made until V▲, V▼or TEST buttons are

pressed.

Analogue display:

This simulates an analogue meter movement to give the user a better

"feel" for how a measurement is progressing. The analogue display shows

resistance only.

Battery Bar Graph:

This is a battery symbol on the LCD display comprising 4 pairs of

segments. The battery is monitored continuously when the instrument is

turned on the charge remaining in the battery is shown in the table below.

Fully charged battery

75% charged battery

50% charged battery

25% charged battery

Some testing still possible but battery may

fail at any time

Symbol flashes when there is not enough

charge to do a test and the instrument turns

itself off

When mains power is present the indicator shows the battery is being

charged by animating the segments of the bar graph.

Capacitance display:

At the end of a test the capacitance of the circuit under test is calculated

and displayed. After a test the display shows the last measurement made

until V▲, V▼or TEST buttons are pressed.

Time Constant:

At the end of a test the time-constant of the circuit under test is calculated

and displayed. After a test the display shows the last measurement made

until V▲, V▼or TEST buttons are pressed.

Voltage input range:

85-260 V, 50/60Hz

Battery life:

6hours continuous testing at 5 kV

Test voltages:

250 V, 500 V, 1000 V, 2500 V, 5000 V

Accuracy (23°C):

±5% to 1 TΩ

±15% 1 TΩto 7.5 TΩ

±20% 5 TΩto 10 TΩ±5 counts

Guard:

2% error guarding 500 kΩleakage with 100 MΩload

Display range:

Digital display 10 kΩto 15 TΩ

Analogue display 100 kΩto 1 TΩ

Short circuit/charge current:

3 mA

Capacitor charge time:

≤5seconds per µF at 3mA

Capacitor discharge time:

≤5seconds per µF to discharge from 5000 V to 50 V

Capacitance measurement:

1nF to 50 µF (dependant on measurement voltage)

Capacitance measurement accuracy (23°C):

±5% ±5 nF

SPECIFICATION

Environmental

Operating temperature:

-10°C to 50°C

Storage temperature:

-25°C to 65°C

Ingress protection (lid closed):

IP65

Humidity:

90% RH non-condensing at 40°C

Dimensions:

305 x 194 x 360 (mm) (12 x 7.6 x 14.2 inches)

Weight:

6.75 kg (15lb) approx

Voltage output accuracy (0°C to 30°C):

0-+4% of nominal test voltage at 100 MΩload

Current measurement range:

±0.01 nA to ±5 mA

Current measurement accuracy (23°C):

±5% ±0.2 nA at all voltages

Display:

Analogue/Digital 3 digits

Interference rejection:

2mA rms

Timer range:

Counts up to 99 minutes from start of test

Test regimes

Auto IR

Lead set:

Three flexible silicon insulated leads with compact clamp.

Safety:

Meets the requirements of EN61010-1:2001 CAT III 300V

EMC:

Meets the requirements of EN61326-1:1998 for use in heavy industrial areas.

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