Sonel MPU-1 Operating instructions

Brand: Sonel

Model: MPU-1

Type: Operating instructions

Sonel MPU-1 This device is ideal for assessing electrical network safety by measuring leakage currents, for example, at transmission pylons. The device allows you to set a leakage current threshold. When the leakage current exceeds that threshold, a visual and acoustic alarm is triggered.

Key capabilities include:

Measuring leakage current in LV and MV AC power systems.
Monitoring leakage current flowing through the grounding of power poles and pylons (0.1 to 299A) in LV and MV 50Hz or 60Hz networks.
Selecting the AC current frequency (50Hz/60Hz) to match the network frequency.
Setting the leakage current threshold for alarm activation.

Key capabilities include:

Measuring leakage current in LV and MV AC power systems.
Monitoring leakage current flowing through the grounding of power poles and pylons (0.1 to 299A) in LV and MV 50Hz or 60Hz networks.
Selecting the AC current frequency (50Hz/60Hz) to match the network frequency.
Setting the leakage current threshold for alarm activation.

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

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

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

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

4 Description 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

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

6 Operation ............................................................................................................ 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

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

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

8 Power 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

9 Cleaning 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 that differs from those specified in 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 may result in damage to the device and constitute a source of danger to the user.

WARNING:

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

regulations and with other relevant fire and safety regulations. Before starting the work with

the device in special environments, e.g. potentially fire-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 leakage current 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:

• Constant monitoring 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 of various diameters can be used without the need to re-calibrate the MPU-1 for 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

OPERATING MANUAL MPU-1 version 1.5 9

4.3 Graphic display (LCD)

Fig.3. Screen view in measurement mode.

4.4 Acoustic and visual alarm signals.

Warning signals:

Continuous two-tone beep with flashing alarm LEDs

• Measured current exceeds the set threshold. The beeping lasts for 30 seconds then becomes

muted. If the alarm condition continues it is indicated by flashing alarm LEDs.

Two long beeps with illuminated alarm LEDs, repeated every 15 seconds.

• Indicates a low level of battery charge. The device should be switched off and the batteries should

be re-charged. If allowed to continue the MPU-1 will turn off automatically.

Short beeps (with active Info option):

• Indicates when the Info function is turned ON. The signal repeates approx. every 60 seconds.

4.5 Measuring Current with Flexible F-Series Probes.

The MPU-1 is calibrated at the factory with Sonel F-Series probes. Probe models compatible with

MPU-1 are listed in Chapter 13 "Accessories".

WARNING:

Dangerous voltages are present. Connecting incompatible or damaged current probes may

cause electric shock. Only use Sonel F-Series probes.

Fig.

. Screen view when alarm is off.

Measurement of current

Alarm threshold value

Battery charge status

Operation mode:

Alarm is ON

Measurement of current

Battery charge status

10 OPERATING MANUAL MPU-1 version 1.5

Note:

The manufacturer guarantees the measurement accuracy when used with measuring

probes supplied with the device or purchased from manufacturer's authorized supplier.

Using extension cords, non-Sonel supplied probes, or other modifications may be a source

of additional errors and safety hazards.

Note:

"CAT III 1000V" marking on accessories is equivalent to "CAT IV 600V" marking.

5 Starting the operation

Before starting the operation of the device:

• Check the MPU-1 for suitability, do not use if the MPU-1 or test leads are damaged, or is

malfunctioning.

• Check the settings of the device; the operating mode, and alarm threshold. Ensure the MPU-1

displays results.

6 Operation

Read this chapter thoroughly as it describes metering circuits, measurement methods, settings and

other important issues.

6.1 Preparing MPU-1 for operation

Before performing measurements:

• Make sure that the battery is fully charged.

• Check the device and accessories for damage

• Check the probes are connected securely and the MPU-1 is adequately situated and protected in

the test workplace.

WARNING:

Do not leave the MPU-1 unattended when performing tests.

Do not touch the equipment connected to the tested circuit or network.

Note:

Do not use the MPU-1 if the display is unreadable.

Note:

Using accessories other than those specified by the manufacturer is prohibited and may

result in a danger to the user or damage to the device.

OPERATING MANUAL MPU-1 version 1.5 11

6.2 Monitoring the internal power supply voltage supplied by the

internal rechargeable battery

Ensure the MPU-1 battery is fully charged before use. The charge level of the rechargeable battery is

indicated by the battery symbol continuously displayed in the right upper corner of the screen.

Fig. 7. Monitoring the battery charge status

For information on the power supply see: Chapter 8 "Power supply of the device".

6.3 Connecting the device.

CAUTION!

Pay attention to the correct connection of plugs of the clamps, as the accuracy of the

measurements depends on the connection quality. Ensure connections are secure and

making good contact and will provide uninterrupted measurement of current.

CAUTION!

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

device.

Connection of the MPU-1 to the power network or device under test is shown in the drawings below:

Fig.9. Operation with single current probe

Battery charge status

12 OPERATING MANUAL MPU-1 version 1.5

Fig.10. Operation with dual current probes

6.4 Operating the interface.

Additional information:

Pressing MENU button when viewing

the MENU options results in exiting the

current MENU option without

confirming the selected value(s). Its

function is equal to BACK /CANCEL

button. Any changes / selected

options are confirmed by pressing

ENTER.

6.4.1 Monitoring leakage current with “Alarm on” mode

The usual mode of operation of the MPU-1 is with “Alarm on”. When the MPU-1 is turned on it always

begins in “Alarm on” mode. To monitor leakage current flowing proceed as follows:

Connect current probes to the socket: 7 "Probe (1)" to perform single-probe measurement or to both

sockets "Probe (1)" 7 and "Probe (2)" 8 to perform dual-probe measurement.

Then:

OPERATING MANUAL MPU-1 version 1.5 13

The MPU-1 is in operating mode with alarm on. The top line of the display indicates the measured value

of current. The bottom line alternates with the Alarm mode setting (on or off), changing to displaying

the alarm threshold value in Amps. Depending on the value of the measured current the bottom line

also indicates whether the measured current is: lower (I <), equal (I =) or higher (I>) than the threshold

setting.

The MPU-1 measures and monitors AC currents of 50Hz or 60Hz depending on user settings. When

the measured current exceeds the alarm threshold setting both a sound and a visual alarm will be

Press

button.

Use

butto

ns to select

Alarm

Confirm your choice by pressing

ENTER

button.

Use

buttons to select

Alarm

Confirm your choice by pressing

NTER

button.



14 OPERATING MANUAL MPU-1 version 1.5

triggered. The sound alarm, a beep, lasts for 30 seconds, then is muted. The visual alarm is indicated

by flashing LEDs on the MPU-1.

To set the alarm threshold setting for leakage current:

Press

button.

Use

buttons to select

Current

Confirm your choice by pressing

ENTER

button.

Use

buttons to select the cur-

rent value above which the alarm will

be triggered.

Confirm your choice by

pressing

ENTER

button.

OPERATING MANUAL MPU-1 version 1.5 15

After pressing ENTER the device automatically displays "Alarm on" and begins to monitor current.

The most recent threshold setting is retained even after it is turned OFF and ON again.

CAUTION: In "Alarm on" mode - the display turns off after 5 min to reduce energy drain on the battery.

Pressing any button will re-activate the display.

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

The MPU-1 can be used to measure and display leakage current without the monitoring and alarm

function; “Alarm off mode”. (Note that whenever the MPU-1 is turned on it is always first activated in

“Alarm on” mode.)

To measure and display the leakage current in “Alarm off” mode:

Connect probes to the socket: "Probe (1)" 7 to perform single-probe measurement; or to sockets

"Probe (1)" 7 and "Probe (2)" 8 to perform dual-probe measurement.



Press

button.

Use

buttons to select

Alarm

Confirm your choice by pressing

ENTER

button

16 OPERATING MANUAL MPU-1 version 1.5

After pressing ENTER the MPU-1 displays “Al. off” (Alarm off). In “Alarm off” mode the MPU-1

displays in real-time the measured AC leakage current at 50Hz / 60Hz depending on user settings but

does not monitor for an alarm condition.

Note:

Pressing MENU button results in exiting the current MENU option without

confirming the selected value(s). Its function is equivalent to BACK/CANCEL.

Remember to press ENTER to confirm a selection.

6.4.3 Setting the AC current frequency.

To set the nominal AC frequency of the network for the equipment being measured as either 50Hz or

60Hz in "Alarm on" mode or in "Alarm off" mode:

Press MENU button.

Use

buttons to select

Alarm

off

Confirm your choice by pressing

ENTER

button.

OPERATING MANUAL MPU-1 version 1.5 17

After pressing ENTER the MPU-1 displays the measured current in the monitoring/measurement

mode. The last setting of frequency is always saved and retained by the MPU-1 after it is turned OFF

and will be in the last setting state when turned ON again.

6.4.4 DEMO function.

The DEMO function is intended to demonstrate the alarm signal to users and personnel responsible

for electrical safety. After selecting the DEMO function the device enters alarm mode for 5 sec

To start DEMO mode:

Use , buttons to select

Frequency

. Confirm your choice by

pressing

ENTER button

Use

buttons to select

Confirm your choice by pressing

ENTER

button.

18 OPERATING MANUAL MPU-1 version 1.5

After pressing ENTER the device starts the alarm mode for about 5 seconds, then automatically reverts

to the monitoring/measurement mode that was displayed before entering the DEMO mode.

6.4.5 Info Mode: Activation of the Acoustic Signal.

The Info function enables user to turn on an acoustic-chirp signal that indicates that the device is

activated and operational. The chirp repeats approx. every 60s. Select "On" from Info menu to activate

the Info mode. Select "Off" disables this function:

Press MENU button.

Press

button.

Use

buttons to sel

ect

Demo

Confirm your choice by pressing

ENTER

button.

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Sonel MPU-1 Operating instructions

Brand: Sonel

Model: MPU-1

Type: Operating instructions

Key capabilities include:

Measuring leakage current in LV and MV AC power systems.
Monitoring leakage current flowing through the grounding of power poles and pylons (0.1 to 299A) in LV and MV 50Hz or 60Hz networks.
Selecting the AC current frequency (50Hz/60Hz) to match the network frequency.
Setting the leakage current threshold for alarm activation.

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Sonel MPU-1 Operating instructions

Sonel MPU-1 Operating instructions

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