MEGABRAS MD 5060x User manual
Formato: 135mm x 190mm
GU-1329
EXP100240
5 kV digital insulation tester
• User guide
• Technical specifications
3
MD-5060x
5 kV digital insulation tester
User guide
GU-1329
© 2009 MEGABRAS. All rights reserved.
Printed in Brazil.
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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
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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
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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.
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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
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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.
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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. -
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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.
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2.3.6. High voltage indicator
A
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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