Bender AF460 Manual de usuario

Manual EN

TGH1402en/11.2020

MF loop monitor

System for monitoring the trailing cable protective

earth conductor by a measurement frequency loop.

Suitable for mobile electrical equipment

in non-gassy underground and opencast mines

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2 TGH1402en/11.2020

Service and support for Bender products

First-level support

Technical support

Carl-Benz-Strasse 8 • 35305 Grünberg • Germany

Telephone: +49 6401 807-760

0700BenderHelp *

Fax: +49 6401 807-629

E-mail: support@bender-service.de

Available on 365 days from 7.00 a.m. to 8.00 p.m. (MEZ/UTC +1)

* Landline German Telekom: Mon-Fri from 9.00 a.m. to 6 p.m.: 6.3 cents/30 sec.; remaining time: 6.3

cents/min.

Mobile phone: higher, depending on mobile phone tariﬀ

Repair service

Repair, calibration and replacement service

Londorfer Strasse 65 • 35305 Grünberg • Germany

Telephone: +49 6401 807-780 (technical issues) or

+49 6401 807-784, -785 (commercial issues)

Fax: +49 6401 807-789

E-mail: [email protected]

Field service

On-site service

Telephone: +49 6401 807-752, -762 (technical issues) or

+49 6401 807-753 (commercial issues)

Fax: +49 6401 807-759

E-mail: ﬁeldservice@bender-service.de

Mon-Thu 7.00 a.m. to 4.00 p.m., Fri 7.00 a.m. to 1 p.m. (MEZ/UTC +1)

TGH1402en/11.2020 3

MF loop monitor

Table of contents

1 General instructions .........................................................................5

1.1 How to use this manual..............................................................................................5

1.2 Indication of important instructions and information ...................................5

1.3 Training courses and seminars.................................................................................5

1.4 Delivery conditions.......................................................................................................5

1.5 Warranty and liability...................................................................................................6

1.6 Disposal of Bender devices........................................................................................6

1.7 Safety .................................................................................................................................6

2 MF loop for monitoring the PE conductor....................................7

2.1 Intended use...................................................................................................................7

2.2 Function............................................................................................................................7

3 Installation and connection .......................................................... 10

3.1 Required components.............................................................................................. 10

3.2 Installation ....................................................................................................................10

3.3 Connection ...................................................................................................................10

4 Operating the MF loop monitor................................................... 12

4.1 Display and controls .................................................................................................12

4.2 Commissioning ...........................................................................................................12

5 Technical data.................................................................................. 13

5.1 Tabulated data ............................................................................................................13

5.2 Dimension diagrams.................................................................................................16

5.3 Ordering data ..............................................................................................................18

6 Appendix .......................................................................................... 19

6.1 Frequency selective current monitor SRCM420 .............................................19

4 TGH1402en/11.2020

TGH1402en/11.2020 5

MF loop monitor

1 General instructions

1.1 How to use this manual

This manual is intended for qualified personnel working in electrical engineering and elec

tronics! Part of the device documentation, in addition to this manual, is the enclosed

“Safety instructions for Bender products”.

Read the manual before installing, connecting and commissioning the device.

Always keep the manual within easy reach for future reference.

1.2 Indication of important instructions and information

I Danger! Indicates a high risk of danger that will result in death or serious injury if

not avoided.

I Warning! Indicates a medium risk of danger that can lead to death or serious injury, if

not avoided.

I Caution! Indicates a low-level risk that can result in minor or moderate

injury or damage to property if not avoided.

Information can help to optimise the use of the product.

1.2.1 Signs and symbols

Disposal Temperature range protect from dust

protect from wetness Recycling RoHS

guidelines

1.3 Training courses and seminars

www.bender.de > Know-how-> Seminars.

1.4 Delivery conditions

The conditions of sale and delivery set out by Bender apply. These can be obtained from Bender

in printed or electronic format.

The following applies to software products:

“Software clause in respect of the licensing of standard software as part of de-

liveries, modifications and changes to general delivery conditions for products

and services in the electrical industry.”

Inspection, transport and storage

Check the shipping and device packaging for transport damage and scope of delivery. The follow-

ing must be observed when storing the devices:

Die Elektroindustrie

6 TGH1402en/11.2020

General instructions

1.5 Warranty and liability

Warranty and liability claims in the event of injury to persons or damage to property are excluded

in case of:

• Improper use of the device.

• Incorrect mounting, commissioning, operation and maintenance of the device.

• Failure to observe the instructions in this operating manual regarding transport, com-

missioning, operation and maintenance of the device.

• Unauthorised changes to the device made by parties other than the manufacturer.

• Non-observance of technical data.

• Repairs carried out incorrectly.

• Use of accessories and spare parts not recommended by Bender.

• Catastrophes caused by external influences and force majeure.

• Mounting and installation with device combinations not recommended by the manufac-

turer.

This operating manual and the enclosed safety instructions must be observed by all persons

working with the device. Furthermore, the rules and regulations that apply for accident preven-

tion at the place of use must be observed.

1.6 Disposal of Bender devices

Abide by the national regulations and laws governing the disposal of this device.

For more information on the disposal of Bender devices, refer to

www.bender.de -> Service & support.

1.7 Safety

If the device is used outside the Federal Republic of Germany, the applicable local standards and

regulations must be complied with. In Europe, the European standard EN 50110 applies.

I Danger!Risk of electrocution due to electric shock!

Touching live parts of the system carries the risk of:

• A fatal electric shock

• Damage to the electrical installation

• Destruction of the device

Before installing and connecting the device, make sure that the installation has been de-ener-

gised. The rules for working on electrical systems must be observed.

TGH1402en/11.2020 7

MF loop monitor

2 MF loop for monitoring the PE conductor

2.1 Intended use

• The MF loop monitor is used to monitor mobile electrical equipment and the associated

supply cables in non-gassy mines underground and in opencast mines. The loop moni-

tor is suitable for IT systems running on 3-phase AC 0…1000 V and 50…60 Hz. The pro-

tective earth conductor is monitored.

• The IT systems must not contain operating equipment which generates interference fre-

quencies in the 1 kHz range, e.g. frequency converters.

• The cable capacitance Ceof the cable being monitored must not be greater than 0.6 μF

per phase.

• The MF loop monitor is not intended to and must not replace any safety measures!

2.2 Function

2.2.1 Principle

In order to monitor the trailing cable PE conductor, a 1 kHz current is fed into the conductor loop

consisting of the PE conductor and the virtual HL conductor. HL is the parallel circuit consisting of

L1, L2 and L3 relating to the generator current IGen. Details are shown on the principle circuit dia-

gram on page 9. Changes in the loop current caused by interruptions or increased resistance

per unit length are recorded by means of a measuring current transformer and the frequency se-

lective SRCM420 residual current monitor. As soon as the current drops below the response value,

an alarm is output and the contactor (BS) shuts down.

2.2.2 Components of the MF loop monitor

Signal generator AF460

The equipment has two equivalent signal outputs to supply two MF loops. The generator supplies

a sinwave output current IGen of 80 mA maximum at a frequency of 1kHz at both outputs. IGen is fed

into the loops PE, L1, L2 and L3. The coupling device AG410 is connected upstream to supply the

current to the outer conductor.

Coupling device AG410

Two coupling devices connect the virtual conductor HL, consisting of L1, L2 and L3, to the rest of

the measurement frequency loop. They connect the current circuit of the generator to 3 current

circuits of the IT system.

Operator unit BG12-1

The contactor (BS) is switched on or off indirectly by means of the operator unit in the loader. The

generator current circuit (MF loop) is connected ohmically by pressing the ON button and IGen in-

creases to approx. ca. 50…60 mA. This current causes the contactor (BS) to switch on via

SRCM420.

The OFF button must be pressed to switch off the contactor (BS). The generator current circuit is

interrupted and the current drops to 28 mA, for example. The size of the current is determined by

the local system leakage capacitance Ce. SRCM420 registers this “undercurrent” and switches off

the contactor (BS).

8 TGH1402en/11.2020

MF loop for monitoring the PE conductor

Frequency selective current monitor SRCM420

The device monitors the generator current circuit for undercurrent. The measuring current trans-

former W20 or W35 supplies the required measuring current Imfor SRCM420. Its input filter, which

is set to 1 kHz, registers the transformer signal with a signal-to-noise ratio of approx. 40dB in rela-

tion to the fundamental component of 50 Hz. When the value drops below the preselected res-

ponse value, the device outputs an alarm. This causes the alarm LEDs AL1 and AL2 to light up and

the changeover contacts K1 and K2 switch over. When K2 switches over, the contactor (BS) swit-

ches off.

2.2.3 Switching off the loop monitor or loader

Pressing the OFF button of the BG12-1 interrupts the MF conductor loop. This lowers the genera-

tor current IGen to below the response value I2. The SRCM420 detects the undercurrent and out-

puts the associated alarm. In other words, the LEDs AL1 and AL2 light up and the alarm relays K1

and K2 switch over. Among the changeover contacts, which operate in N/C MF loop for monito-

ring the PE conductor operation, the contacts 11-12 and 21-22 are connected. When K2 switches

over, this causes the contactor (BS) to shut down.

2.2.4 Switching on the loop monitor or loader

Pressing the ON button of the BG12-1 closes the MF conductor loop. This increases the generator

current IGen to 50…60 mA. The SRCM420 detects a current outside the alarm range and terminates

the alarm output. In other words, the LEDs AL1 and AL2 go out and the alarm relays K1 and K2

switch over. Among the changeover contacts which operate in N/C operation, the contacts 11-14

and 21-24 are now closed. When K2 switches over, this causes the contactor (BS) to switch on.

2.2.5 Loop monitor detects longitudinal discontinuity

If a longitudinal discontinuity occurs inside the MF loop and drops the generator current below

the response value I2, the SRCM420 outputs an alarm. This shuts down the contactor (BS).

2.2.6 Meaning of the displayed current values

Generator current IGen when the operator unit is switched on

Standard: 50…60 mA

When the operator unit BG12-1 is switched on, the size of the generator current IGen is determined

by the system leakage capacitance Ceand the ohmic resistance of the entire MF loop. The resul-

ting impedance Zdetermines the size of the generator current IGen. This current must be measu-

red after installing the MF loop monitor and is used as a reference value for assessing the system.

Generator current IGen when the operator unit is switched off

Standard: 10…30 mA

When the operator unit BG12-1 is switched off, the size of the generator current IGen is mainly de-

termined by the system leakage capacitances Ce. This current must be measured after installing

the MF loop monitor and is used as a reference value for assessing the system.

TGH1402en/11.2020 9

MF loop monitor

Generator current IGen in the event of a longitudinal discontinuity

If the generator current drops below the response value I2, SRCM420 outputs an alarm and shuts

down the contactor (BS).

Generator current when the operator unit is switched off and when there

are possible transverse discontinuities

Parasitic parallel resistances in the loop, e.g. L1 to PE can cause the contactor (BS) to switch on

due to the increase in generator current. These resistances must therefore be monitored cons-

tantly by an insulation monitoring device.

The following principle circuit diagram gives an overview of how the MF loop monitor operates.

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10 TGH1402en/11.2020

Installation and connection

3 Installation and connection

3.1 Required components

• Signal generator AF460-2

• 2 Coupling devices AG410

• Frequency-selective current monitor SRCM420-D-2

• Measuring current transformer Type W20 or W35

• Operator unit BG12-1

• Operating manual for the MF loop monitor

3.2 Installation

The components of the MF loop monitor are installed dispersed. Dimensional drawings of the en-

closure can be found on page 16 onwards.

3.2.1 Installing a stationary switch cabinet

1. AF460 and SRCM420 must be snapped into position on DIN rails inside the switch cabi-

net.

2. The measuring current transformer must be installed near the earthing point of the PE

conductor. It can be installed using 4 x M5 screws or mounted on a DIN rail. A snap-on

mounting (order number B98080501) will be needed for the latter.

3. The base plate for the AG410 must be fastened with 4 x M5 screws. See dimensional

drawing on page 17.

3.2.2 Installing on the loader

1. Another AG410 must be installed on the loader. Fasten the unit with 4 x M6 screws.

2. The mounting dimensions of the BG12-1 and the BG12 are identical.

3.3 Connection

The figure below shows the sealing cover open and connection of the measuring current transfor-

mer cables.

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