Sonel MPU-1 Manuale utente

OPERATING MANUAL

MPU-1

LEAKAGE CURRENT ALARM SIGNALER

SONEL SA

ul. Wokulskiego 11

58-100 Świdnica, Poland

SONEL TEST & MEASUREMENT Inc.

Santa Clara, Ca, 95054

www.soneltest.com

Version 1.4 9.15.2016

2 OPERATING MANUAL MPU-1 version 1.5

CONTENTS

1Preface...................................................................................................................4

2Introduction..........................................................................................................5

3Safety.....................................................................................................................5

4Description and Features.....................................................................................5

4.1 Characteristics of MPU-1.......................................................................................5

4.2 Arrangement of sockets and buttons......................................................................6

4.2.1 Keyboard.......................................................................................................6

4.2.2 Sockets...........................................................................................................8

4.3 Graphic display (LCD) ..........................................................................................9

4.4 Acoustic and visual alarm signals..........................................................................9

4.5 Measuring Current with Flexible F-Series Probes.................................................9

5Starting the operation........................................................................................10

6Operation............................................................................................................10

6.1 Preparing MPU-1 for operation ...........................................................................10

6.2 Monitoring the internal power supply voltage supplied by the internal

rechargeable battery.......................................................................................................11

6.3 Connecting the device..........................................................................................11

6.4 Operating the interface.........................................................................................12

6.4.1 Monitoring leakage current with “Alarm on” mode...................................12

6.4.2 Displaying and Measuring Leakage Current in "Alarm off" mode.............15

6.4.3 Setting the AC current frequency. ...............................................................16

6.4.5 Info Mode: Activation of the Acoustic Signal..............................................18

6.4.6 Changing the language ...............................................................................19

6.4.7 Reset function..............................................................................................21

7Troubleshooting .................................................................................................22

7.1 Warnings and information displayed by the device.............................................22

8Power supply of the device................................................................................23

8.1 Monitoring the power supply voltage ..................................................................23

8.2 Replacing rechargeable batteries..........................................................................23

8.3 Charging rechargeable batteries...........................................................................23

8.4 General principles for using Ni-MH rechargeable batteries ................................24

9Cleaning and maintenance................................................................................25

OPERATING MANUAL MPU-1 version 1.5 3

10 Storage.................................................................................................................25

11 Dismantling and Disposal..................................................................................25

12 Technical specifications .....................................................................................25

12.1 Basic data.........................................................................................................25

12.2 Other technical specifications..........................................................................26

13 Accessories ..........................................................................................................26

13.1 Basic accessories..............................................................................................26

13.2 Optional accessories.........................................................................................26

14 Manufacturer......................................................................................................28

4 OPERATING MANUAL MPU-1 version 1.5

1 Preface

Thank you for purchasing the MPU-1 leakage current alarm signaler. The MPU-1 is a modern, easy

and safe to use signaling device. Please acquaint yourself with this manual to avoid measuring errors

and problems with the operation of the device.

This manual contains three types of warnings. They are presented as a framed text describing the

possible risks for the user and the device. Texts starting with word ‘WARNING:’ describe situations,

which may endanger user's life or health when instructions are not followed. Word ‘CAUTION!’ begins

a description of a situation which may result in device damage when instructions are not followed.

Indication of possible problems is preceded by word ‘Note:’.

WARNING:

Before operating the device, read thoroughly this manual and observe the safety

regulations and guidelines provided by the manufacturer.

WARNING:

The MPU-1 is designed to provide additional protection against electric shock in the

workplace, therefore using the MPU-1 is NOT a substitute for any other protection measures

in the workplace and/or personal protection equipment used by employees and must not

be relied upon as a sole safety and protection measure. Appropriate occupational health

and safety regulations must be observed along with other instructions, rules and safety

measures in accordance with local or national regulations.

WARNING:

The leakage current alarm signaler is designed to measure and monitor the leakage current

in LV and MV networks. Any application thatdiffers from those specifiedin this manual may

result in a damage to the device and constitute a source of danger to the user.

WARNING:

The MPU-1 signalers must only be used only by qualified persons, certified to perform

measurements on LV and MV live networks. Operating the device by unauthorized

personnel mayresult in damage to the device and constitute a source of danger to theuser.

WARNING:

Using this manual does not exclude the need to comply with occupational health and safety

regulations andwith other relevant fire and safetyregulations. Before starting the work with

the device in special environments, e.g. potentiallyfire-risk/explosive environment, consult

with the person(s) responsible for health and safety. Do not work alone.

OPERATING MANUAL MPU-1 version 1.5 5

2 Introduction

This manual describes the operation of MPU-1 leakagecurrent alarm signaler.We recommend reading

the manual thoroughly in order to avoid errors that may result in danger to the user, or an incorrect

assessment of the tested network. For more information on safety during measurements -see Chapter

3–Safety. Before first use of the device, be sure to read Chapter 5–Starting the operation. For

additional information related to interpreting the warnings and information displayed by the device, it is

recommended to read Chapter 7 –Troubleshooting. All information on operating the device may be

found in Chapter 6 –Operation.

3 Safety

The MPU-1 is designed for measuring and monitoring the leakage current in LV and MV AC

power systems. It is a tool for assessing the safety of electrical networks by measuring leakage

currents, such as at transmission pylons. The device allows users to set a threshold of leakage

current above which a visual and acoustic alarm will be triggered. The following

recommendations must be observed for the correct operation and accuracy of measured

results:

•Before using the device carefully read this manual

•The MPU-1 should be operated only by qualified persons that have passed occupational health

and safety training.

Do not use or operate the MPU-1 under the following circumstances:

The MPU-1 is damaged, completely, or partially out of order, or has been dropped or subjected to

physical abuse or shock.

The insulation of the test leads are damaged.

The MPU-1 has been stored for an excessive period of time in excessive humidity or heat.

Before using the device make sure the test leads are securely connected to the appropriate

measurement sockets.

Repairs may be only performed only by an authorized Sonel service center.

Cautionary Notes:

•If the discharged battery symbol appears on the display (the internal power supply voltage is too

low) recharge the batteries.

•When the power supply voltage is too low the measurements performed with the device may

include additional errors undetected by the user and they should not be used to confirm that the

tested circuit or network is properly protected.

•Caution is required for AC voltages with RMS value exceeding 30 V or when their peak value

exceeds 42 V. Be also careful when DC voltages exceeding 60 V. Such voltages generate a risk

of electric shock.

4 Description and Features

4.1 Characteristics of MPU-1

Design features of the MPU-1 include:

•Constantmonitoring of (leakage)current flowing through the grounding of power poles, and pylons,

in the range of 0.1 to 299A, in LV and MV 50Hz or 60Hz networks.

6 OPERATING MANUAL MPU-1 version 1.5

•Measurements can be made with one or two current probes. With two probes the measurement of

current is summed for both probes providing the opportunity to measure leakage current in twin

poles using individual probes for each component pole.

•An alarm trigger can be set for when the current flow exceeds a user programmable threshold. The

default setting is at 1A. Both an acoustic alarm via a built-in speaker and a visual alarm via flashing

lights are provided.

•No measurement of direct currents.

•Measurements are made with Sonel flexible F-series current probes of Rogowski coil design.

Probes ofvarious diameterscan be used without the needto re-calibrate the MPU-1for each probe.

•The enclosure is ergonomically designed and carries an IP 67 rating. (Protection from ingress

against dust, and immersion to 1m).

•Battery charge status is monitored. An LED indicates operation mode.

4.2 Arrangement of sockets and buttons

Fig.1. Arrangement of LEDs and buttons (front panel).

4.2.1 Keyboard

1 ON/OFF button

Turns the device ON/OFF.

2 MENU button

Selects the measurement function:

•Alarm –setting the alarm on or off

•Curr –setting the alarm threshold for current flow

•Demo –simulation of an alarm condition

OPERATING MANUAL MPU-1 version 1.5 7

•Freq –sets the rated frequency of the network (50Hz or 60Hz)

•Info –information about the operation of the device

•Lang –selects user interface language

•Reset –restores factory (default) settings

3 ENTER button

Enters settings, exits to menu.

4 LED indicating the operational status of the device

•LED Illumination states :

- LED is green –the device is in operational mode

- LED is red –device error (additional error code is displayed, as described below)

- LED flashes red –low battery charge level

•Battery charging mode –when connected to AC charger

- LED flashes green –battery charging

- LED is green –battery is fully charged

5 Buttons

A set of cursors with auto-repetition for choosing MENU options and changing settings

6 Alarm LEDs

A set of red alarm LEDs arranged in two rows on the front panel (5 LEDs in each row), and in two

rows at the sides of the device (5 LEDs on each side). Their operation is described in the next

sections.

and

8 OPERATING MANUAL MPU-1 version 1.5

4.2.2 Sockets

CAUTION!

MPU-1 signaler is designed to measure the current flowing through conductors with

voltages up to 1000V.

Connecting voltages higher than 25V between any of the test terminals may damage the

device.

7 Measuring socket [Probe (1) / Charger]

To connect a single Sonel F-Series Rogowski-type current probe. Used for measurements with a

single probe. The battery charger also connects to this socket; it has the same pronged connector.

Unused socket should be covered with the flexible socket cover.

8 Measuring [Probe (2)]

To connect a second Sonel F-Series Rogowski-type current probe. Used for measurements with a

two probes. Unused socket should be covered with the flexible socket cover.

When using two probes the MPU-1 mathematically sums up the current values from the two probes

and does not take into account any phase shifts.

Fig.2. Arrangement of sockets in MPU

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