Megger MHP1 Bedienungsanleitung

Withstand Testers

MHP1 & MHP2

User Guide MEGGER®

Safety Warnings 2

General Description 4

Features, Controlsand Connections 5

Operation

Testing Precautions 11

Before each testing sequence 12

Carrying out a test 12

Switched Low Voltage probe LP2 13

120 kΩresistance Box 14

Specification 15

Accessories 16

Repair and Warranty 17

Symbols used on the instrument

Caution:Refer to User Guide

Risk of Electric shock

Danger of death

Protective Ground (Earth) Terminal

Equipment complies with current EU Directives.

Contents Guide de l’utilisateur - p18 Gebrauchsanleitung - s34 Guía del usuario - p50

SAFETY WARNINGS

✱High Voltage testing is hazardous. Safety Warnings and Precautions must be

read and understood before the instrument is used. They must be observed during

use.

✱Testing must only be carried out in a dedicated, demarcated, High Voltage testing

area which is clearly marked. National and local safety codes and standards must be

observed.

✱For safety, the instruments must be properly grounded (earthed). A separate

protective ground (earth) lead mustbecorrectly connected from the Protective ground

(Earth) terminal to a reliable ground (earth) before testing. This is in addition to the

ground (earth) wire in the power (mains) lead which must also be connected to

provide a double level of safety.

✱Suitable external interlocks must be used. The remote control unit is not a safety

interlock and must not be used as such.

✱The instrument, HV test probe, Low voltage test lead (or LV probe) and any remotely

connected equipment must not be used if any part is damaged.

✱The HV test probe and Low Return lead (or LV probe) must be confirmed as being in

good order, clean, with no broken or cracked insulation before each test sequence.

✱Exposed metal parts, including the HV probe tip, LV probe tip, Low return lead clip and

the item under test must notbetouched during testing, or until completely discharged.

✱The High Voltage probe must only be held with the fingers and thumb behind the

hand guard.

✱Replacement fuses, parts and accessories must be of the correct type and rating.

NOTE

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

The MHP1 and MHP2 Testers are designed for general Withstand (Flash) testing of electrical

equipment and insulating materials. The instruments are operated from a nominal 115 V or

230 V 50/60 Hz mains supply pre-set at the factory, and have a variable output voltage providing

up to 3 kV a.c. (MHP1 and MHP2) and up to 4 kV d.c. (MHP2 only). The instruments are self

contained in a sheet steel cabinet, with simple to use controls on the front face of the unit.

Customer terminals, accessed behind a rear panel enable connection for external relay control,

external indicator beacon and external safety interlocks. An optional remote switch facility is

available. The instruments have been designed for indoor use only and as such should not be

used in harsh conditions or outside. The instruments are designed for Installation Category II

use. Installation Category II relates to transient overvoltages likely to be met on grounded

(earthed) receptacles (socket outlets). The instrument is supplied with a 3 wire power cord. The

instrument must be used with a grounded (earthed) supply, and all 3 wires must be connected.

The colour code of the cord is :- U.S.A. U.K./International

Ground (Earth) Green Yellow/Green

Neutral White Blue

Line (Phase) Black Brown

Safety features include:-

✱Interlock terminals enable automatic disconnection of the test voltage when

accessing the device under test.

✱High Voltage warning terminals provide a connection for a high

visibility beacon.

✱Two methods of control allow the user to select the best method for the

type of testing undertaken.

✱Two independent methods of grounding (earthing), supply cord ground and

an additional protective Ground (Earth) terminal located at the rear of the

instrument, both of which must be used.

General Description

Features, Controls and Connections

FAIL

VOLTS

POWER

TRIP mA

0.3

0.5

1.0

2.0

3.5

5.0

HI-POT

MHP2

MEGGER®

BREAKDOWN

TRIP/

TRIP

STOP START STOP

1. Illuminated mains On / Off switch

2. Voltage control knob

3. Trip Level Switch

Sets the current trip limit when testing with the trip or breakdown/trip mode. This level can be set

to: 0.3 mA, 0.5 mA, 1.0 mA, 2.0 mA, 3.5 mA, 5.0 mA, 10.0 mA peak a.c. (or d.c. on MHP2).

Warning:- The Trip level Switch does not limit the instantaneous current that can flow

from the instrument prior to switchoff. Up to 1⁄2cycle delay will occur before switch off.

4. Test mode select switch

There are two methods of automatically disconnecting the supply:-

i) Breakdown

The test voltage is applied until insulation breakdown (a sharp increase in current

independent of continuous leakage current), or user intervention.

ii) Breakdown / Trip

As for Breakdown above, but the test voltage will also be removed automatically if

the leakage current exceeds the limit set on the Trip Level Switch.

iii) Trip

The test voltage is automatically removed if the leakage current exceeds the limit set on

the Trip Level Switch.

Note:-The test voltage will only be removed automatically if the leakage current exceeds the limit

set on the Trip Level Switch.

5. Visual ‘Test Fail’ indicator

Illuminates to indicate when test conditions have been exceeded. An internal buzzer will also

sound when the visual indication is active.

6. Output volt meter

Used in conjunction with the Voltage control to set, and give an accurate indication of output test

voltage. After a d.c. test the voltmeter will indicate capacitive discharge voltage at the terminals.

7. High Voltage indicator

When the instrument is generating high voltage the indicator is illuminated. The voltage on the

terminals will be indicated on the voltmeter at all times.

8. High voltage a.c. output receptacle

The HV receptacles used in the instrument are designed to accept a locking plug. To insert the

plug, align the arrows on the plug with the open padlock symbol, push in, and then turn the plug

through 90° to align the arrows with the closed padlock symbol. This will now lock the plug into

the instrument. To remove, turn the plug to align the arrows with the open padlock symbol and

withdraw.

9. High voltage d.c. output receptacle. (MHP2 only)

The H.V. d.c. receptacle locking facility is identical to the a.c. receptacle. The internal H.V.

capacitors are protected by a built-in integral impedance. This effectively causes the d.c.

output voltage to fall, as the test current is drawn. See ‘Specification’.

High Voltage probe

The High Voltage probe is designed to lock into the High voltage receptacle(s) and is fitted with

a hand guard, and a spring loaded electrode cover which retracts as the probe is pressed to the

item being tested. See ‘Accessories’ for replacement probe.

Warning:- The probe must not be used in a damaged or dirty state. Do not touch any

part of the HV probe in front of the guard or the device under test, until

completely discharged.

Warning:- Care must be taken not to touch the probe to any adjacent ungrounded

(unearthed) metalwork such as pipes, window frames etc. as this may

become hazardous live.

10. Low Return terminal

The Low Return lead must be connected to this terminal. The terminal is internally connected to

the instrument ground (earth). The Low Return lead is fitted with a hook connector so that it will

not pull off the terminal. To check this lead, see ‘Before each testing sequence’.Areplacement

low voltage lead is available, see ‘Accessories’.

11. Start button

Controls the high voltage output. Either of two modes of operation can be selected and set using

a moveable link situated behind the rear panel cover:-

i) The latched mode (link to the right) allows the user hands free operation. Operation of the

Stop button, quickly followed by the Start button causes HV generation until the test fails,

or the Stop button is pressed.

ii) The unlatched mode (link to the left) requires the Stop button to be pressed, followed

quickly by the Start button, which must be held in for the entire test. The test can be

stopped at any time by releasing the Start button or by pushing the Stop button. The

instrument will halt the test should the test parameters be exceeded.

12. Stop button

When pushed the stop button:-

✱Stops the test

✱Resets a failure indication.

✱Initiates a start sequence. To avoid inadvertent test voltage application, the test

Start sequence requires the Stop button to be pressed first, followed by pressing the Start button

within 1 second.

Features, Controls and Connections

1. Protective Ground (Earth) terminal

For safety, the instruments must be properly earthed. A protective ground (earth) lead must be

correctly connected from the this terminal to a reliable ground (earth) before testing.

Warning:- The IEC power supply cord connection to ground (earth) must notbe

solely relied upon. If the ground (earth) connection of the IEC lead becomes

disconnected, or defective, the metal instrument case could become ‘live’

rising to the dangerously high output voltage of the instrument. A second

ground must be connected to the protective ground terminal on the rear of

the instrument.

2. R/C Remote On /Off receptacle

The optional AVO remote On / Off unit RC1 plugs into this receptacle allowing remote activation

of the unit (see ‘Accessories’).

Warning:- The remote On / Off unit is not a safety interlock and must not be

used as such.

3. IEC Line connector

Provides a means of disconnection from the line supply. To gain access to the line supply fuses,

the Start button mode link, and the customer terminals, the IEC line connector must be removed

from the instrument. The screw holding the cover in position is then removed and the cover can

be swung up out of the way, exposing the interface terminals, Start button mode link, and fuses.

4. Fuse Replacement

The fuses provide protection for the user and instrument. To gain access to the fuses, remove

the IEC mains connector from the instrument. The screw holding the cover in position is then

removed and the cover can be swung up out of the way, exposing the fuses. Replacement fuses

must be of the correct type and rating. See ‘Specification’.

RELAY

HV ON

INTER

-LOCK

INTER

-LOCK

R/C

230V

50/60Hz

40VA

2 x T2A HBC

IEC 127

LATCHED

UNLATCHED

N/O

COM

N/C

250V

8A MAX

HV ON

P2 - R

P1 - R

P2 - S

P1 - S

INTER

-LOCK

BLUEBELL PA 19422, USA.

DALLAS, TX 75237 - 1017, USA.

AVO International

MADE IN UK.

DOVER CT17 9EN, UK.

100 W

MAX

Rear Panel

On the rear panel, other features of the instrument can be accessed:-

Features, Controls and Connections

RELAY

HV ON

INTER

-LOCK

INTER

-LOCK

R/C

BLUEBELL PA 19422, USA.

DALLAS, TX 75237 - 1017, USA.

AVO International

MADE IN UK.

DOVER CT17 9EN

230V

50/60Hz

40VA

2 x T2A HBC

IEC 127

LATCHED

UNLATCHED

N/O

COM

N/C

250V

8A MAX

HV ON

P2 - R

P1 - R

P2 - S

P1 - S

INTER

-LOCK

100 W

MAX

2 x T2A

HBC

IEC 127

Terminal connections and fuses

5. Start mode link (under cover plate)

To gain access to the Start mode link, remove the IEC mains connector from the instrument. The

screw holding the cover in position is then removed and the cover can be swung up out of the

way, exposing the Start button mode link. The link has two positions; to the left provides the

unlatched mode, to the right provides the latched mode. Gently pull to remove the link from the

terminals, and re-position as required.

6. Interface and Interlock terminals (under cover plate)

To gain access to the interface terminals, remove the IEC mains connector from the instrument.

The screw holding the cover in position is then removed and the cover can be swung up out of

the way, exposing the interface terminals. The terminals are not suitable for solid core wires.

Multi-stranded conductors, 22-16 AWG (1mm2- 1,5 mm2) should be used. The use of wire

ferrules is recommended to eliminate stray strands of wire; recommended insulation strip length

is 8 mm. The terminal screws should be tightened securely. On completion, the cover plate

should be swung back into position and secured by replacing and tightening the cover plate

retaining screw.

Terminal connections and fuses

The interface terminals are in three groups:-

i) Relay Terminals

The top three terminals are for applications that require an external test status indication.

‘Test Failed’ and ‘Test OK’ can be signalled. The maximum current that can be switched

is 8 Amp at 250 Volts.

When the ‘Failed’ condition is active, the Common terminal is shorted to the Normally Open

(N/O) terminal.

When the ‘Failed’ condition is active the Common terminal and the Normally Closed (N/C)

terminal are open circuited by the instrument.

To gain access to the relay terminals, the IEC line connector must be removed from the

instrument. The screw holding the cover in position is then removed and the cover can be swung

up out of the way, exposing the interface terminals.

ii) HV On Terminals

Some regulations call for various signalling lamps to indicate hazardous and

potential Risk situations. The terminals shown allow for the connection of a Line powered

‘High Voltage On’ indicator or beacon. See ‘Accessories’ for Warning beacon. A

maximum current of 1⁄2Amp can be drawn from these terminals.

HV ‘On’ terminal connections

Normal Open

Common

Phase

Neutral

Alarm

Sounder

Common

Phase

Neutral

Normal Closed

Indicator

Lamp

Cable

gland Cable

gland

Start mode link Start mode link

HV On

Cable gland

Start mode link

Line voltage

at up to Amp

1/2

iii) HV Interlock Terminals

The bottom four terminals enable the HV supply to be safety interlocked. The instrument is

supplied without the interlock terminals connected. The HV interlock terminals must be

connected before the instrument will generate High Voltage. The Users HV safety interlock

system must conform to National and Local safety codes and be designed in such a way that

any contact with live parts is prevented. This is normally achieved by a solid barrier that must be

removed before access can be obtained to the hazardous area. The action of removing the

barrier forces the interlock switches to the open position thus interrupting the supply voltage for

the HV generation circuit. The interlock connections operate at Line (mains) voltage. All wiring

connected to these terminals must rated for Line (mains) use and capable of carrying a current

of 3 amps.

Interlock connection example

7. Cable entry glands

When wiring the safety interlocks, the wires to the terminals must pass through the cable entry

glands and then be connected to the appropriate terminals. Cables of 1⁄8” to 1⁄4” (3 mm to

6.5 mm) outer insulation diameter can be used. The glands must be sufficiently tightened, after

wiring, so that flexing the external cord does not cause any movement of the wires inside the

panel. On completion, the cover plate should be swung back into position and secured by

replacing and tightening the cover plate retaining screw.

Features, Controls and Connections

P2 - R

Guard Op

Optional 'Ready to 

Test' Indicator

P1 - S

P1 - R

P2 - S

Cable gland



Line voltage 

on terminals

Start mode link

Guard in

Open

Position

Interlock

switch

(user supplied)

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