MEGABRAS MD 5060x Manual de usuario

Formato: 135mm x 190mm

GU-1329

EXP100240

5 kV digital insulation tester

• User guide

• Technical specifications

MD-5060x

5 kV digital insulation tester

User guide

GU-1329

Printed in Brazil.



Safety warnings

•Before to use this instrument the User guide and Safety warnings must be read

and understood.

•Safety procedures and rules for working near high voltage energized systems

must be observed during the use of this equipment. The generated voltages may

be dangerous.

•Do not connect or disconnect the test leads during the measurement.

•Do not touch the test leads before the high voltage indicator turn-off.

•Be careful not to make short-circuit between the high voltage terminals and the

“R” or “Guard” terminals while a measurement is running, because it could be

dangerous for the operator.

•Be sure that there are not any voltage difference between the points to which the

equipment will be connected to, neither between them and ground.

•The panel, terminals and connectors of the equipment must stay dry and clean.

This equipment should be used only by a trained and competent

person, strictly applying suitable safety rules.

Used symbols



Caution, risk of electric shock.



Caution, refer to User guide.

Equipment complies with current EU Directives.



Battery



Printer

Voltmeter

Index

1. Description............................................................................................................6

2. Control panel functions.........................................................................................7

2.1. Connections and panel items ........................................................................7

2.2. Keyboard .......................................................................................................8

2.3. Indicators .....................................................................................................10

2.3.1. Display..................................................................................................10

2.3.2. Built-in chronometer .............................................................................10

2.3.3. Real time clock .....................................................................................10

2.3.4. Test number .........................................................................................10

2.3.5. Model and serial number ......................................................................10

2.3.6. High voltage indicator ...........................................................................11

3. Power supply ......................................................................................................11

3.1. Battery status check ....................................................................................11

3.2. Battery charger............................................................................................12

4. Connecting the equipment..................................................................................13

4.1. Using the Guard terminal.............................................................................14

5. Tests definition ...................................................................................................14

5.1. Test voltage definition..................................................................................15

5.2. Selection of the operation mode..................................................................16

5.2.1. “TIMER” Mode ......................................................................................16

5.2.2. SVT Mode (step voltage tests) .............................................................17

5.2.3. “Pass / Fail” Test mode ........................................................................18

5.2.4. Normal mode ........................................................................................19

6. How to perform tests ..........................................................................................19

6.1. Polarization index (PI) .................................................................................20

6.2. Dielectric Absorption Index (DAI) ................................................................21

7. Other functions ...................................................................................................22

7.1. Filter.............................................................................................................22

7.2. Voltmeter .....................................................................................................22

7.3. Hold .............................................................................................................22

7.4. Internal memory...........................................................................................23

7.5. Auto power-off .............................................................................................23

8. Software..............................................................................................................24

8.1. USB Drivers.................................................................................................24

8.2. MegaLogg2 Software ..................................................................................27

8.3. HyperTerminal®- Real time data transfer....................................................28

8.3.1. COM number ........................................................................................28

8.3.2. HyperTerminal ......................................................................................30

9. Printer .................................................................................................................33

10. Technical specifications....................................................................................34

11. Application note 32 ...........................................................................................36

12. Warranty ...........................................................................................................39

1. Description

The Megabras MD-5060x is a smart, microprocessor-controlled, 5 kV

insulation tester and analyzer. Besides the conventional measurement of

insulation resistances up to 5 TΩ, its advanced features allow to

automatically measure both the Polarization Index and Dielectric

Absorption Index, thus significantly simplifying testing of transformers.

This insulation tester is portable, battery-powered equipment. Test

voltage may be chosen from 500 V to 5 kV in 100 V increments. Due to its

measurement principle (actual voltage and current readings) the accuracy

of resistance measurement is not affected by any test voltage error.

The built-in chronometer automatically counts the elapsed time since the

start of measurement. Measured values are transmitted through the data

output (USB) and are printed in the built-in printer as a registration of the

performed test. Furthermore, the measured values are stored in a non-

volatile internal memory. Up to 4000 measurements may be stored, to be

transferred afterward to a computer running the MegaLogg2 program.

This software allows a further analysis of the test results, including a

graphical representation and automatic report generation. The real time

clock and calendar, and the sequential test number, facilitates the

identification of each test, and the organization of a predictive

maintenance system by trend analysis.

Some other advanced features are useful to run the most sophisticated

insulation analysis. Step Voltage Test, configurable Pass-Fail and timed

measurements are automatically performed, with a very simple and user-

friendly setup. The measurement parameters are stored in the non-

volatile memory for an easy configuration.

The cabinet is strong and lightweight, easy to carry, impact-resistant and

suitable to be used under severe weather conditions. Thus the insulation

tester supplies very reliable and accurate measurements both in

laboratory and out in the field.

2. Control panel functions

2.1. Connections and panel items

Voltage output terminal (-V)

Zero reference terminal (+R)

Guard terminal (G)

Display

Keyboard

USB communication port

Power supply input

Paper feed control

2.2. Keyboard

Button Function Led

On/Off switch. -

It activates the filter that minimizes external

noise interference.

Indicates filter function

is on.

It shows the battery charge status on the

display.

Indicates that the

battery charger is in

operation.

When activated, it allows to program test

voltage in steps of 500 V. It enables the fast

voltage selection keys .

500 V steps test

voltage.

When activated, it allows to program test

voltage in steps of 100 V. It enables the fast

voltage selection keys .

100 V steps test

voltage.

Fast selection of 500 V test voltage. 500 V test voltage.

Fast selection of 1 kV test voltage. 1 kV test voltage.

Fast selection of 2.5 kV test voltage. 2.5 kV test voltage.

Fast selection of 5 kV test voltage. 5 kV test voltage.

When activated, it allows to program the

Operation Mode (Normal, SVT or TIMER).

Indicates Operation

Mode is enabled.

When activated, it allows to program the limit of

the “Pass-Fail test”.

Indicates LIM function

is on.

Turns On/Off the printing of the measured

values on the printer.

The printer is on.

Increase the value that is being programmed. -

Decrease the value that is being programmed. -

Starts the test. Indicates that the test

is being carried out.

Displays the actual voltage applied. -

Hold - freeze the last reading on the display. Hold function is on.

It displays the calculated value as the result of a

Step Voltage Test (SVT) or Polarization Index

(PI).

It displays the calculated value as the result of a

Dielectric Absorption Index. -

End of test. -

2.3. Indicators

2.3.1. Display

Alphanumeric LCD where the measurement result, the corresponding

measuring unit, the elapsed time since the measurement started, the

analogue indication by means of a bargraph and messages to the

operator are displayed (in English).

messages to the operator

test number

measurement results

measuring unit

analogue indication

(bargraph)

selected voltage

messages to the operator

time indication

2.3.2. Built-in chronometer

It features the elapsed time (in minutes and seconds) since test voltage is

applied.

2.3.3. Real time clock

It has a real time clock with date, hours and minutes indication, to make

identification of tests recorded in paper or in memory easier.

2.3.4. Test number

Tests are automatically numbered by the equipment to make their

identification easier. The test number is printed at the beginning of each

test and it is stored in memory.

2.3.5. Model and serial number

At the beginning of each test, the equipment model, as well its serial

number, are registered, making it possible to relate the obtained results

with their respective equipment Calibration Certificate.

2.3.6. High voltage indicator

light indicator warns the occurrence of high voltage on the

output terminal during the measurement and keeps lit until the

discharging process has been completed.

3. Power supply

This equipment is powered by an internal rechargeable battery (12 V -

2.3 Ah).

3.1. Battery status check

During the measurement, it is possible to check the battery status. The

key must be pressed. If the battery charge is enough, it will read

“BAT OK”. If the charge is not enough, the message will be “LOW BAT”,

and the battery should be recharged. The analogue bargraph will give an

approximate idea of the remaining charge percentage (at least 20% is

required for a normal operation).

When the battery charge reaches the normal operation minimum value,

the message LO BAT appears automatically in the area where the test

tension value is indicates, alternating it every 1 second.

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