Bender Isometer ir1575h User manual

ISOMETER® IR1575H

Insulation monitoring device for IT AC and DC systems

Software version: D0275 V1.3

Manual ENIR1575H_D00416_00_M_XXEN / 03.2021

2 IR1575H_D00416_00_M_XXEN / 03.2021

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)

IR1575H_D00416_00_M_XXEN / 03.2021 3

ISOMETER® IR1575H

Table of Contents

1 Safety information.............................................................................5

1.1 Intended use...................................................................................................................5

1.2 Warranty and liability...................................................................................................5

1.2.1 Personnel..................................................................................................................................5

1.2.2 Hazards when handling the ISOMETER® ......................................................................6

1.2.3 Inspection, transport and storage...................................................................................6

1.2.4 Note............................................................................................................................................6

1.3 Explanation of symbols and warnings ..................................................................6

1.4 Directions for installation...........................................................................................7

2 Function...............................................................................................8

2.1 Features ............................................................................................................................8

2.2 Product description......................................................................................................8

2.3 Function............................................................................................................................8

2.4 Self test..............................................................................................................................9

3 Commissioning flow chart ............................................................ 11

4 Connection ....................................................................................... 14

5 Operation and setting.................................................................... 15

5.1 Diplay and operating elements ............................................................................ 15

5.1.1 Display in standard mode............................................................................................... 15

5.1.2 Display in menu mode ..................................................................................................... 15

5.1.3 Function keys....................................................................................................................... 16

5.2 Menu structure and menu mode.........................................................................17

5.3 Menu ISO SETUP: Setting of the ISOMETER® functions................................ 19

5.3.1 Response values Alarm1 and Alarm2 ......................................................................... 19

5.3.2 Operating principle ........................................................................................................... 19

5.3.3 Memory setting (on/off) .................................................................................................. 20

5.4 PASSWORD menu ...................................................................................................... 21

5.5 LANGUAGE Menu.......................................................................................................22

5.6 SERVICE menu ............................................................................................................. 23

5.7 INFO menu.................................................................................................................... 23

6 Technical data IR1575H ................................................................. 24

6.1 Data in tabular form..................................................................................................24

6.2 Standards and certifications ..................................................................................26

6.3 Characteristic curves................................................................................................. 26

6.4 Ordering information ............................................................................................... 26

6.5 Dimension diagram enclosure IR1575H............................................................27

4 IR1575H_D00416_00_M_XXEN / 03.2021

1 Safety information

1.1 Intended use

The ISOMETER® is intended for:

• monitoring the insulation resistance of IT systems

Any other use, or use which goes beyond the foregoing, is deemed to be use other than for the

intended purpose. Use for the intended purpose also includes:

• compliance with all information in this operating manual and

• compliance with test intervals.

As a basic principle, our „General Conditions of Sale and Delivery“ shall apply. At the latest, these

shall be available to the operator when the contract is concluded.

1.2 Warranty and liability

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

if they can be attributed to one or more of the following causes:

• Use of the ISOMETER® other than for the intended purpose

• Incorrect assembly or installation, commissioning, operation and maintenance of the

ISOMETER®

• Failure to comply with the information in the operating instructions regarding transport,

commissioning, operation and maintenance of the ISOMETER®

• Unauthorized structural modifications to the ISOMETER®

• Failure to comply with the technical data

• Improperly executed repairs, and the use of spare parts or accessories which are not re-

commended by the manufacturer

• Cases of disaster and force majeure.

• Assembly and installation with device combinations not recommended by the

manufacturer

This operating manual, especially the safety information, must be observed above all by person-

nel who work on the ISOMETER®. In addition, the rules and regulations that apply for accident

prevention at the place of use must be observed.

1.2.1 Personnel

Only appropriately qualified personnel may work on the ISOMETER®. Qualified means familiar

with the installation, commissioning and operation of the product and with training appropriate

to the work. Personnel must have read and understood the safety section and warning

information in this operating manual.

IR1575H_D00416_00_M_XXEN / 03.2021 5

ISOMETER® IR1575H

1.2.2 Hazards when handling the ISOMETER®

The ISOMETER® is constructed according to the state-of-the-art and the recognized technical safe-

ty rules. Nevertheless, when it is being used, hazards may occur to the life and limb of the user or

third parties or there may be adverse effects on the ISOMETER® or on other valuable property. The

ISOMETER® must only be used:

• for the purpose for which it is intended;

• when it is in perfect condition as far as safety is concerned;

Any faults which may impair safety must be eliminated immediately. Impermissible modifications

and the use of spare parts and additional devices which are not sold and recommended by the

manufacturer of the devices may cause fires, electric shocks and injuries. Unauthorized persons

must not have access to or contact with the ISOMETER®. Warning signs must always be easily

legible. Damaged or illegible signs must be replaced immediately.

1.2.3 Inspection, transport and storage

Inspect the dispatch packaging and equipment packaging for damage, and compare the contents

of the package with the delivery documents. In the event of damage in transit, please inform the

Bender company immediately. The devices must only be stored in areas protected from dust,

damp and spray or dripping water, and in which the specified storage temperatures are maintai-

ned.

1.2.4 Note

Make sure that the operating voltage is correct!

Prior to insulation and voltage tests, the ISOMETER® must be disconnected from the power

system for the duration of these tests.

In order to check the proper connection of the device, it is recommended to carry out a

functional test.

Make sure that the basic settings meet the requirements of the system.

Children and unauthorized persons must not have access to or contact with the ISOMETER®.

1.3 Explanation of symbols and warnings

In order to make it easier for you to find specific text passages and references in this manual, im-

portant information is emphasized by symbols. The meaning of these symbols is explained

below:

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.

6 IR1575H_D00416_00_M_XXEN / 03.2021

Safety information

1.4 Directions for installation

I CAUTION! Ensure disconnection from the IT system! Only one insulation monitoring device

may be used in each interconnected IT system.

When insulation or voltage tests are to be carried out, the device must be isolated from the sys-

tem for the test period.

I CAUTION! Connect terminals and KE separately to PE! The terminals and KE shall

be connected by a separate wire to the protective conductor (PE). If the terminals L1, L2 of the

device are connected to a system under operation, the terminals and KE must not be

disconnected from the protective conductor (PE).

In order to check the proper connection of the device, it is recommended to carry out a functional

test using a genuine insulation fault RF, e.g. via a suitable resistance.

The device variant -4… is delivered with the following factory setting:

ISO SETUP: Alarm 1/Alarm 2 = 40 kΩ/10 kΩ

ISO SETUP: Operating mode K1/K2 = N/O operation

ISO SETUP: Memory = oﬀ

Please check if the basic setting of the ISOMETER® complies with the requirements of the system

to be monitored.

When an AC system being monitored contains galvanically coupled DC circuits:

An insulation fault can only be monitored correctly when the rectifiers carry a

continuous load current of 5…10 mA.

IR1575H_D00416_00_M_XXEN / 03.2021 7

ISOMETER® IR1575H

2 Function

2.1 Features

• ISOMETER® for IT AC systems (IT = unearthed electrical systems)

• Two separately adjustable response ranges of 2 kΩ ... 1 MΩ each (Alarm 1, Alarm 2)

• Two-line LC display

• Connection monitoring of the measuring leads to the IT system and to earth

• Automatic device self test

• Option „W“ provides increased shock and vibration resistance for use in ships, in rolling

stock and in seismic regions

• ISOMETER® for IT AC systems with galvanically connected rectifiers and for IT DC systems

Unup to 793 V

• Automatic adaptation to the existing system leakage capacitance Ceup to 100 μF

• AMP measuring principle (European Patent: EP 0 654 673 B1)

2.2 Product description

The ISOMETER® IR1575H monitors the insulation resistance of IT systems. The IR1575H is designed

for use in 3(N)AC, AC and DC systems. AC systems may include extensive DC-supplied loads (such

as converters). The adaptation to the existing system leakage capacitances takes place

automatically.

2.3 Function

The device is connected between the unearthed system and the protective conductor (PE).

The response values and other function parameters are set via the function keys. The parameters

are indicated on the LC display and are stored in a non-volatile memory (EEPROM).

The IR1575H superimposes a microprocessor-controlled pulsating AC measuring voltage on the

system being monitored (AMP measuring principle). The „adaptive measuring pulse“, is a measu-

ring method developed and patented by Bender (European Patent: EP 0 654 673 B1). The

measuring pulse consists of positive and negative cycles of the same amplitude. The period

depends on the respective system leakage capacitances and the insulation resistance of the

system to be monitored.

An insulation fault between system and earth closes the measuring circuit. The evaluation circuit

calculates the insulation resistance which is indicated on the LC display or the external kΩ

measuring instrument after the measuring time has expired.

The measuring time is determined by the system leakage capacitance, the insulation resistance

and the system-related disturbances. System leakage capacitances do not influence the

measuring accuracy.

If the reading is below the selected response values ALARM1/ALARM2, the associated alarm relays

respond and the alarm LEDs „ALARM1/2“ light up and the LC display indicates the measured

value (in the event of DC insulation faults, the faulty system conductor will be indicated on the LC

display). If the terminals R1/R2 are bridged (external RESET button [N/C contact] or wire jumper),

the fault message will be stored.

8 IR1575H_D00416_00_M_XXEN / 03.2021

Function

Pressing the RESET button resets the fault message provided that the insulation resistance is at

least above 25% above the preset response value. The fault memory behaviour can also be set in

the „ISO SETUP“ menu by selecting the submenu Memory: on/off.

By pressing the TEST button, the function of the ISOMETER® can be tested. All essential measuring

functions as well as connections to the IT system and to earth will be checked. This self test will

automatically be carried out every 24 hours. The self test is automatically carried out once the

supply voltage has been switched on.

2.4 Self test

In order to guarantee high functional reliability, the ISOMETER® provides comprehensive self test

functions. After switching the supply voltage on, all internal measuring functions, the compo-

nents of the process control such as data and parameter memory as well as system and earth

connections are checked using the self test functions. The progress of the self test is indicated on

the display by a bar graph. Depending on the system conditions, the self test is completed after

15…20 seconds, then the message „Test ok!“ appears on the display for approximately two

seconds. Then the device returns to the normal measuring mode and the currently measured

value will be displayed once the measuring time has elapsed.

When a device or connection fault is found, the message „!Error!“ appears on the display, the

system fault LED lights, the relay K2 (21-22-24) switches and the corresponding fault message (see

table) will be indicated. If such a system fault occurs, another self test will be started after

approximately one minute. If no more faults are detected, the fault message will automatically be

deleted, the system fault LED will go out.

During operation, the self test function can be started by pressing the TEST button (internal or

external). The alarm relays Alarm1/2 only switch after starting the self test function by pressing

the TEST button.

Fault message Description Appropriate actions

System

connection?

No low-resistance connection between

the terminals L1, L2 and the system

1. Check the wiring between the terminals

L1, L2 and the system.

2. Press the TEST button.

3. Switch the supply voltage oﬀ and on.

4. Check the fuses.

Connection PE? No low-resistance connection between

the terminals and KE and the

earth (PE).

1. Check the wiring of the terminals and KE and the earth (PE).

2. Press the TEST button.

3. Switch the supply voltage oﬀ and on.

Device error x Internal device error 4. Press the TEST button.

5. Switch the supply voltage oﬀ and on.

6. Please contact Bender.

IR1575H_D00416_00_M_XXEN / 03.2021 9

ISOMETER® IR1575H

Reset run control

If, for operational reasons, the supply voltage cannot be switched on and off, a reset of

the run control can be carried out by pressing the buttons RESET, MENU and TEST

sequentially.

Proceed as follows:

1. Press and hold down the RESET button.

2. Press and hold down the MENU button.

3. Press the TEST button for at least two seconds.

After these steps are run through, the run control and the self test will be started again.

10 IR1575H_D00416_00_M_XXEN / 03.2021

Function

3 Commissioning flow chart

In the three-page commissioning flow chart, the encircled numbers correspond to the numbers in

the legend to wiring diagram (see page 14).

to Commissioning (2)

technical data.

A0/A1 or A0/A2.

IR1575H_D00416_00_M_XXEN / 03.2021 11

ISOMETER® IR1575H

Commissioning of the ISOMETER® (2)

to Commissioning (3)

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12 IR1575H_D00416_00_M_XXEN / 03.2021

Commissioning ﬂow chart

Commissioning of the ISOMETER® (3)

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IR1575H_D00416_00_M_XXEN / 03.2021 13

ISOMETER® IR1575H

4 Connection

The ISOMETER® provides plug-in terminals.

The connections A0/A1 resp. A0/A2 to the supply voltage Ushave to be provided with protective

devices according to IEC 60364-4-43. A 6 A fuse is recommended.

Devices for protection against short-circuit in conformity with IEC 60364-4-43 for the coupling of

terminals L1/L2 to the IT system being monitored can be omitted if the wiring is carried out in

such a manner as to reduce the risk of a short-circuit to a minimum. (a short-circuit-proof and

earth-fault-proof wiring is recommended).

An external TEST button or an external RESET button may only be connected to one ISOMETER®.

A parallel connection of several test and reset inputs for collective ISOMETER® testing is not

allowed.

Wiring diagram

Legend

1Supply voltage Us(see nameplate, technical data on

page 24 or ordering information) via 6 A fuse

2, 3 Connection to the 3AC system being monitored:

Connect the terminals L1, L2 to neutral conductor N or

terminals L1, L2 to conductor L1, L2.

4Connection to the DC systems being monitored:

Connect terminal L1 to conductor L+, terminal L2 to

conductor L-

5Connection of the AC system to be monitored:

Connect terminals L1, L2 to conductor L1, L2.

6Separate connection of and KE to PE

7External TEST button (N/O contact)

8External RESET button (N/C contact or wire jumper),

When the terminals are open, the fault message will

not be stored. Factory setting: Memory oﬀ!

9Alarm relay K2

10 Alarm relay K1

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







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



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

















































IR1575H-435

A0/A1: AC 88…264V, DC 77…286 V

A0/A2: AC 340…460V

14 IR1575H_D00416_00_M_XXEN / 03.2021

Connection

5 Operation and setting

5.1 Diplay and operating elements

5.1.1 Display in standard mode

5.1.2 Display in menu mode















Legend

1Two-line display for standard and menu mode

2TEST button: to call up the self test

UP key: parameter change, to move up in the menu

3RESET button: to delete stored insulation fault

alarms

DOWN key: parameter change, to move down in

the menu

4MENU key: to activate the menu system

ENTER key:To conﬁrm parameter change.

5ALARM LED 1 lights: insulation fault, ﬁrst

warning level reached.

6ALARM LED 2 lights: Insulation fault, second

warning level reached or system fault alarm

1Indication of the insulation resistance in kΩ

2Additional information about the insulation

resistance:

„+“ = Insulation fault at L+

„–“ = Insulation fault at L–

„s“ = A new measuring process has been started

3= Polarity of the test current pulse (AMP)

4Messages:

- Insulation fault

- Connection system?

- Connection PE?

- Device error x















Parameter change is permitted

Parameter change is blocked, enabling by a password

IR1575H_D00416_00_M_XXEN / 03.2021 15

ISOMETER® IR1575H

5.1.3 Function keys

Two functions are assigned to each function key. In addition to the basic function marked with a

circle, the keys allow navigation within the menu.

Key Meaning

 

Press the TEST key to start the self test of the ISOMETER®

Press the RESET key to reset insulation fault alarms stored in the

ISOMETER®. Activate the fault memory in the ISO-Setup menu or bridge R1/

R2 to make this function available. Furthermore, the ISOMETER® can only be

reset when the measured insulation value is at least 25% higher than the

actual response value.



Press the MENU key to call up the menu system.

Use the Arrow UP and Arrow DOWN keys and the ENTER key to scroll

through the menu system.



UP key

To move up in the menu, to increase the parameter value



DOWN key:

To move down in the menu, to decrease the parameter value



Enter key

To select a menu item or submenu item,

To conﬁrm or save a parameter change and return to the associated submenu

item or skip to the next input ﬁeld.

When the menu is not terminated, the device will return to the display mode after approximately

five minutes.

For the sake of clarity, the following symbols are used in the menu diagrams for the

representation of ENTER, UP/DOWN:

Key symbol Meaning

Enter key

Up-/Down key

16 IR1575H_D00416_00_M_XXEN / 03.2021

Operation and setting

5.2 Menu structure and menu mode

To switch to the menu mode

Press the MENU key to switch from the standard mode to the menu mode and to the main menu.

From here you can branch to the different submenus.

Navigation within the menu

Use the UP and DOWN keys to select the appropriate menu item. A flashing cursor indicates

which submenu is selected. Press the ENTER key to call up the submenu of the associated menu

item.

In the submenus, the appropriate parameters are also selected by means of the UP and DOWN

keys. Press the ENTER key to move the cursor to the edit field.

The „Arrow up“ symbol tells you that you have reached the end of the menu list.

Parameter change

If the password protection is activated and the symbol „padlock closed“ appears on the display

, you have to enter the valid password before changing the parameters by means of the

UP/DOWN keys. Once the password is entered correctly, all parameters can be changed as long as

you stay in the menu.

Changing the parameters usually has an immediate effect on the measuring and alarm functions.

The changed parameter is stored in a non-volatile memory after returning to the submenu by

pressing the ENTER key (flashing cursor in column 1).

During menu operations, all measuring and alarm functions work normally.

To switch from the menu to the standard mode

After selecting the menu item „EXIT“ and confirming this with the ENTER key, you will leave the

respective menu and reach the next higher level. This either will be the main menu or the

standard mode.

If no key is pressed in a main or submenu, the system will automatically return from the menu

mode to the standard mode after approximately five minutes.

IR1575H_D00416_00_M_XXEN / 03.2021 17

ISOMETER® IR1575H

Diagram menu structure

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





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













 

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



























18 IR1575H_D00416_00_M_XXEN / 03.2021

Operation and setting

5.3 Menu ISO SETUP: Setting of the ISOMETER® functions

All alarm functions such as Alarm1 and Alarm2 (prewarning and alarm), the operating principle of

the alarm relays K1 and K2 (N.O = N/O operation, N.C = N/C operation) and the fault memory

behaviour are set in this menu.

5.3.1 Response values Alarm1 and Alarm2

The alarm values Alarm1 and Alarm2 are selected with the UP/DOWN key and with the ENTER key.

5.3.2 Operating principle

K1/K2 are factory-set to N.O Test, that means N/O operation. The term „Test“ points out that the

alarm relays are switched over during a manual self test. In order to prevent the alarm relays from

switching during a manual self test, for any other reason, select N.C or N.O.

K1: N.C Test = N/C operation contacts 11-12-14, with relay test

(the alarm relay is energized during normal operation)

K1: N.O Test = N/O operation contacts 11-12-14, with relay test