Major tech MT328 Manuale utente

INDEX PAGE

Index ………………………………………………………………………………………………………………………………………… 2

Safety ……………………………………………………………………………………………………………………………………… 3

Specifications ………………………………………………………………………………………………………………. 4

Features ………………………………………………………………………………………………………………………………. 5

Connections ……………………………………………………………………………………………………………………. 5

Instrument Layout …………………………………………………………………………………………………… 6 - 7

Testing Disconnection Sensitivity of Breakers …………………… 8

Testing Disconnection Time of Breakers …………………………………… 9

Preparation for Measurement …………………………………………………………………… 10

Battery & Fuse Replacement …………………………………………………………………….. 10

Calibration ………………………………………………………………………………………………………………………… 11

Servicing ……………………………………………………………………………………………………………………………… 11

11. SERVICING AND CALIBRATION

Your Digital RCCB/ELCB Tester has been Factory Calibrated.

However, it is of good practice to have your Instrument “CERTIFIED”

by a National Calibration Facility.

1. SAFETY PRECAUTIONS

Electricity can cause severe injuries even with low voltages or currents.

Therefore it is extremely important that you read the following information

before using your Digital RCCB/ELCB Tester.

1.1) This instrument must only be used and operated by a competent trained person

and in strict accordance with the instructions. The company will not accept liability

for any damage or injury caused by misuse or non compliance with instructions

and safety procedures.

1.2) Never open Your Digital RCCB/ELCB Tester except for battery replacement.

(See Battery replacement section)

1.3) Always inspect your Digital RCCB/ELCB Tester and test leads before use for any

sign of abnormality or damage. If any abnormal conditions exist (broken test

leads, cracked case, display faulty etc….) do not attempt to take any

measurement or use the tester.

1.4) Never replace the protective fuse with any other than the specified or approved

equivalent.

1.5) Your Digital RCCB/ELCB Tester has been designed with your safety in mind.

However, no design can completely protect against incorrect use. Electrical

circuits can be dangerous and/or lethal when a lack of caution or poor safety

practice is used. Use caution in the presence of voltage above 24V as these

pose a shock hazard.

1.6) Pay attention to cautions and warnings which will inform you of potentially

dangerous procedures.

8. PREPRERATION FOR MEASUREMENT

Before testing Always Check the Following:

At Power “ON”, read the display to make sure the “Replace Battery”

message do not appear.

There is no visual damage to the Instrument or Test leads.

Test lead Continuity with a continuity meter.

9. BATTERY REPLACEMENT

Your Digital RCCB/ELCB Tester’s battery is situated under the tester.

Your Smart-test, display will indicate you when the battery needs to be

replaced.

Disconnect the Test leads from the instrument, remove the battery cover

and the batteries.

Replace with eight 1.5V R6 or L6 batteries, taking care to observe correct

polarity.

Replace battery holder and the battery cover.

10. FUSE REPLACEMENT

The fuse is located under the battery holder. To replace the fuse, proceed

as per battery replacement to open the battery cover, then remove and

replace the fuse located under the battery holder.

Only replace with the same specification fuse. (2A Fast Blow)

2. SPECIFICATIONS

Current Settings 0 - 1000mA

Current Selection Knob

Phase Start Selection;

0˚ Yes

180˚ Yes

Phase Polarity Trip Indicator Yes

Operating Voltage (L-E) 110Vac to 317Vac

Timer Resolution 1mS

Timer Accuracy 1mS

Current Accuracy 1% & 2mA

Current Resolution 1mA

Voltmeter Accuracy 5%

Voltmeter Resolution 1V

Operating Temperature -5˚C - 45˚C

Storage Temperature -10˚ - 47˚C

Battery 8 x AA batteries

Maximum Current Specified at 317Vac

7. RCCB/ELCB TESTING - TIME DELAY -

Turn Instrument “ON” by pressing the “ON” button.

The L.C.D display will come to the following Screen.

- Instantaneous

* - Time Delay

Dial Starting

Current 125mA

Push Select to change Selection

To Instantaneous, then Press “TEST”

Dial the Starting Current of the

Instantaneous Test using the knob

Positive

Start Edge

Select the Positive or negative

Start Edge using the Select Button

Connect Leads

To Earth & Phase

Connect Leads

The Test will start

V = 317V T= 4.023s

I = 125mA

Test in Progress

Between leads is 317V

V = 317V + T = 12.435s

I = 125mA HOLD → TRP

TRP = Tripped, Display on Hold

At 12.435s Tripped on + edge of signal

3. FEATURES

2 Lines x16 Characters

Very Low Consumption

Smart Microprocessor Controlled

Two years Factory Warranty

Better than 2% accuracy (current)

Menu driven

Accurate Digital readout of Disconnection Time

Accurate Digital readout of Disconnection Sensitivity

Data Hold function

Zero Crossing Circuitry permit testing at 0˚ or 180˚

Disconnection Phase Polarity shown on L.C.D display

Auto-Off

Polarity Trip Indicator (positive or negative phase)

4. CONNECTIONS

MAX 450V

CAT III

6. RCCB/ELCB TESTING - SENSITIVITY -

Turn Instrument “ON” by pressing the “ON” button.

The L.C.D display will come to the following Screen.

* - Instantaneous

- Time Delay

Dial Starting

Current 123mA

Push Select to change Selection

To Instantaneous, then Press “TEST”

Dial the Starting Current of the

Instantaneous Test using the knob

Positive

Start Edge

Select the Positive or negative

Start Edge using the Select Button

Connect Leads

To Earth & Phase

Connect Leads

The Test will start

V = 317V

I = 127mA

Test in Progress

Between leads is 317V

V = 317V

I = 140mA HOLD → TRP

TRP = Tripped, Display on Hold

At 140mA, Tripped on - edge of signal

ON/TEST SELECT START

Adjust Current

MT328

Press “TEST”

0˚ - 180˚

5. INSTRUMENT LAYOUT

1. On Switch Test

Button Switch

2. Selection Switch

0˚ - 180˚ Switch

3. Current Selection Knob

4. L.C.D

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