Bender ISOMETER IRDH275BM-7 User manual

Manual ENIRDH275BM-7_D00123_07_M_XXEN / 08/2020
ISOMETER® IRDH275BM-7
Coupling device AGH675S-7
and AGH675S-7MV15
Insulation monitoring device for medium voltage IT systems with galva-
nically connected rectifiers and converters up to AC/DC 15.5 kV in com-
bination with the coupling devices AGH675S-7 and AGH675S-7MV15

2 IRDH275BM-7_D00123_07_M_XXEN / 08/2020
Service and support for Bender products
First-level support
Technical support
Carl-Benz-Strasse 8 • 35305 Grünberg • Germany
Telephone: [phone]
0700BenderHelp *
Fax: [phone]
E-mail: [e-mail]
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: [phone] (technical issues) or
[phone], -785 (commercial issues)
Fax: [phone]
E-mail: [email protected]
Field service
On-site service
Telephone: [phone], -762 (technical issues) or
[phone] (commercial issues)
Fax: [phone]
E-mail: fi[e-mail]
Mon-Thu 7.00 a.m. to 4.00 p.m., Fri 7.00 a.m. to 1 p.m. (MEZ/UTC +1)

IRDH275BM-7_D00123_07_M_XXEN / 08/2020 3
ISOMETER® IRDH275BM-7
Table of contents
1 General instructions .........................................................................5
1.1 How to use this manual..............................................................................................5
1.2 Indication of important instructions and information ...................................5
1.2.1 Signs and symbols ........................................................................................................5
1.3 Training courses and seminars.................................................................................5
1.4 Delivery conditions.......................................................................................................5
1.5 Inspection, transport and storage ..........................................................................5
1.6 Warranty and liability...................................................................................................6
1.7 Disposal of Bender devices........................................................................................6
1.8 Safety .................................................................................................................................6
1.9 Device-specific safety information .........................................................................6
1.10 Intended use...................................................................................................................7
1.11 Directions for installation...........................................................................................7
2 Function...............................................................................................9
2.1 Characteristics IRDH275BM-7 incl. AGH675S-7….............................................9
2.2 Product description......................................................................................................9
2.3 Function description................................................................................................. 10
3 Dimensions, installation and connection................................... 12
3.1 Dimension diagrams................................................................................................. 12
3.2 Mounting IRDH275....................................................................................................12
3.3 Installation of the coupling device AGH675S-7….........................................12
3.4 Wiring diagrams (by way of example)................................................................ 13
4 Operation and setting.................................................................... 16
4.1 Operating features and displays IRDH275BM-7 ............................................. 16
4.1.1 Display in the standard mode............................................................................... 16
4.1.2 Display in the menu mode ..................................................................................... 17
4.1.3 Function keys............................................................................................................... 17
4.2 Menu structure and menu mode.........................................................................18
4.2.1 Diagram menu structure......................................................................................... 19
4.3 Menu HISTORY INFO................................................................................................. 19
4.3.1 Diagram HISTORY INFO ........................................................................................... 20
4.4 Menu ISO SETUP: Setting of the basic ISOMETER® functions .................... 21
4.4.1 Response values Alarm 1 and Alarm 2...............................................................21
4.4.2 Operating principle of the alarm relays............................................................. 21
4.4.3 Diagram ISO SETUP ................................................................................................... 22
4.4.4 Memory settings (on/off) ........................................................................................ 22
4.4.5 Current output for external measuring instruments.................................... 23
4.5 Menu ISO ADVANCED: Setting of the extended functions ........................ 23

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4.5.1 Coupling devices AGH: 675S-7….........................................................................23
4.5.2 Adaptation to the system leakage capacitance Cemax ...............................23
4.5.3 Measuring principle (Measure: AMP).................................................................. 23
4.5.4 Setting the repetition time for automatic self tests (Autotest: 24h)....... 23
4.5.5 Setting the real-time clock (Clock)....................................................................... 23
4.5.6 Setting the date (Date)............................................................................................. 24
4.5.7 Specifying the starting time of the automatic self test (Test) ................... 24
4.5.8 Diagram ISO ADVANCED.........................................................................................24
4.6 Menu COM SETUP: Setting the BMS interface ................................................ 25
4.6.1 Bus address „Addr:“ ...................................................................................................25
4.6.2 Diagram COM SETUP ................................................................................................ 25
4.7 Menu PASSWORD ......................................................................................................26
4.7.1 Activating and setting the password.................................................................. 26
4.7.2 Diagram PASSWORD................................................................................................. 26
4.8 Menu LANGUAGE.......................................................................................................26
4.8.1 Setting the national language...............................................................................26
4.8.2 Diagram Language.................................................................................................... 27
4.9 Menu SERVICE .............................................................................................................27
4.10 Parameterization via Internet................................................................................27
5 Serial interfaces ............................................................................... 28
5.1 RS-485 interface with BMS protocol ...................................................................28
5.2 Topology RS-485 network ......................................................................................28
5.2.1 Correct arrangement ................................................................................................28
5.2.2 Wrong arrangement .................................................................................................29
5.2.3 Wiring .............................................................................................................................29
5.3 BMS protocol ...............................................................................................................29
5.3.1 BMS Master................................................................................................................... 29
5.3.2 BMS Slave......................................................................................................................30
5.3.3 Commissioning of an RS-485 network with BMS protocol ........................ 31
6 Technical data IRDH275BM-7 with AGH675S-7….................... 32
6.1 Data in tabular IRDH275BM-7................................................................................32
6.2 Data in tabular AGH675S-7.....................................................................................34
6.3 Data in tabular AGH675S-7MV15.........................................................................35
6.4 Characteristic curves.................................................................................................36
6.5 Standards and approvals......................................................................................... 38
6.6 Ordering details.......................................................................................................... 38

IRDH275BM-7_D00123_07_M_XXEN / 08/2020 5
ISOMETER® IRDH275BM-7
1 General instructions
1.1 How to use this manual
This manual is intended for qualified personnel working in electrical engineering and
electronics! 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 avoi-
ded.
I Caution! Indicates a low-level risk that can result in minor or moderate injury or damage to pro-
perty if not avoided.
i
Information can help to optimise the use of the product.
1.2.1 Signs and symbols
Disposal Temperature range protect from dust
protect from wet-
ness
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.”
1.5 Inspection, transport and storage
Check the shipping and device packaging for transport damage and scope of delivery. The following
must be observed when storing the devices:
Die Elektroindustrie

6 IRDH275BM-7_D00123_07_M_XXEN / 08/2020
General instructions
1.6 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, commission-
ing, 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 manufacturer.
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 prevention at the place
of use must be observed.
1.7 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.
1.8 Safety
If the device is used outside the Federal Republic of Germany, the applicable local standards and regu-
lations 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-energised. The
rules for working on electrical systems must be observed.
1.9 Device-specific safety information
The basic setting of the device must meet the requirements of the IT system.
I Make sure that the operating voltage is correct! Prior to insulation and voltage tests, the
ISOMETER® must be disconnected from the IT system for the duration of the test. In order to check
the correct connection of the device, a functional test has to be carried out before starting the sys-
tem.

IRDH275BM-7_D00123_07_M_XXEN / 08/2020 7
ISOMETER® IRDH275BM-7
i
In the event of an alarm message of the ISOMETER®, the insulation fault should be eliminated as qui-
ckly as possible. If the device is installed inside a control cabinet, the insulation fault message must
be audible and/or visible to attract attention.
i
When using ISOMETER®s in IT systems, make sure that only one active ISOMETER® is connected in
each interconnected system. If IT systems are interconnected via coupling switches, make sure that
ISOMETER®s not currently used are disconnected from the IT system and deactivated. IT systems cou-
pled via diodes or capacitances may also influence the insulation monitoring process so that a cen-
tral control of the different ISOMETER®s is required.
Prevent measurement errors! When a monitored IT system contains galvanically coupled DC cir-
cuits, an insulation fault can only be detected correctly if the rectifier valves (e.g. rectifier diode, thy-
ristors, IGBTs, frequency inverters, …) carry a minimum current of > 10 mA.
i
Unspecified frequency range! When connecting to an IT system with frequency components below
the specified frequency range, the response times and response values may differ from the indicated
technical data. However, depending on the application and the selected measurement method, con-
tinuous insulation monitoring is also possible in this frequency range. There is no influence on the in-
sulation monitoring for IT systems with frequency components above the specified frequency range,
e.g. within the range of typical switching frequencies of frequency inverters (2…20 kHz).
1.10 Intended use
The ISOMETER® with additional coupling devices is intended for monitoring the insulation resistance of
IT systems.
In order to meet the requirements of the applicable standards, customised parameter settings must be
made on the equipment in order to adapt it to local equipment and operating conditions. Please heed
the limits of the range of application indicated in the technical data.
Any use other than that described in this manual is regarded as improper.
1.11 Directions for installation
I risk of property damage due to unprofessional installation! If more than one insulation monito-
ring device is connected to a conductively connected system, the system can be damaged. If several
devices are connected, the device does not function and does not signal insulation faults. Make sure
that only one insulation monitoring device is connected in each conductively connected system.
When insulation or voltage tests are to be carried out, the device shall be isolated from the system
for the test period. Otherwise the device may be damaged.
The terminals and KE shall be connected by a separate wire to the protective conductor (PE). If the
device is connected by means of terminal AK via the coupling device to a system under operation, the
terminals and KE must not be disconnected from the protective conductor (PE).
i
Check proper connection! Prior to commissioning of the installation, check that the device has been
properly connected and check the device functions. Perform a functional test using an earth fault via
a resistance that is suitable for the mains voltage.

8 IRDH275BM-7_D00123_07_M_XXEN / 08/2020
General instructions
Factory setting device variant -7...
ISO SETUP: Alarm 1 / Alarm 2 = 2 M/ 100 k
(response value)
ISO SETUP: Operating principle K1/K2 = N/O operation
ISO SETUP: Memory = o
ISO ADVANCED: System leakage capacitance = 2 F
ISO ADVANCED: Coupling device = AGH: 675S-7
Com SETUP: Bus adress = 3 (Slave)

IRDH275BM-7_D00123_07_M_XXEN / 08/2020 9
ISOMETER® IRDH275BM-7
2 Function
2.1 Characteristics IRDH275BM-7 incl. AGH675S-7…
• Device combination for use in medium voltage systems with converters up to AC/DC 15.5 kV
(IT = unearthed systems))
• Automatic adaptation to the existing system leakage capacitance
• measuring principle (European Patent: EP 0 654 673 B1)
• Two separately adjustable ranges of the response value100 kΩ… 10 MΩ (Alarm 1, Alarm 2)
• Info button to display device settings and the system leakage capacitance
• Two-line LC display
• Automatic device self test
• Memory with real-time clock to store all alarm messages with date and time stamp.
• BMS interface (BMS protocol) for data exchange with other Bender devices
(RS-485 electrically isolated).
• Current output 0 (4)…20mA (galvanically separated) in relation to the measured insulation
value.
• Self monitoring with automatic alarm
• Automatic self test, selectable
• Connection for external kΩ indication
• Test and reset button
• Connection external test and reset button
• Two separate alarm relays with two potential-free changeover contacts
• N/O or N/C operation, selectable
• Remote setting of certain parameters via the Internet (Gateway COM465xx additionally requi-
red)
2.2 Product description
• The ISOMETER® IRDH275BM-7 and coupling device AGH675S-7 monitor the insulation resis-
tance of IT medium voltage systems up to 7.2 kV.
• The ISOMETER® IRDH275BM-7 and two coupling devices AGH675S-7MV15 monitor the insula-
tion resistance of IT medium voltage systems up to 15.5 kV.
Both combinations are suitable for universal use in 3/(N) AC, AC/DC and DC systems. AC systems may
include extensive DC supplied loads, such as converters or thyristor-controlled DC drives. Drive systems
including a converter and a motor in medium voltage systems can be monitored.
• When the AGH675S-7 is connected in the mid-point of the converter DC intermediate circuit,
a maximum of ±7.2 kV against PE may occur.
• When the two coupling devices AGH675S-7MV15 are connected in the mid-point of the con-
verter DC intermediate circuit, a maximum of ±15.5 kV against PE may occur.
The device automatically adapts itself to the existing system leakage capacitance. The IRDH275BM-7
can be used in combination with a control and indication panel, e.g. PRC1470 version 2 or higher, on
the BMS (BMS = Bender Measuring Device Interface) bus.

10 IRDH275BM-7_D00123_07_M_XXEN / 08/2020
Function
2.3 Function description
The combination ISOMETER® IRDH275BM-7 and coupling device AGH675S-7 or two coupling devices
AGH675S-7MV15 is operated between the unearthed system (IT 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 nonvolatile memory (EEPROM) after the setting is
completed.
A microprocessor-controlled pulsating AC measuring voltage is superimposed on the IT system to be
monitored ( measuring principle*). The measuring cycle consists of positive and negative pul-
ses of the same amplitude. The period of these pulses depends on the respective system leakage capa-
citances and the insulation resistances of the IT system to be monitored.
An insulation fault between the IT system and earth closes the measuring circuit. From the measured
current value, the microprocessor calculates the insulation resistance which is indicated on the LC dis-
play or the external kΩ measuring instrument.
The measuring time tan is determined by the system leakage capacitances, the insulation resistance,
and the system-related interference disturbances. System leakage capacitances do not influence the
measuring accuracy. When virtually no disturbances are caused by the operation of converters, the
measuring process takes about five minutes.
If the reading is below the selected response values Alarm 1/Alarm 2, the associated alarm relays re-
spond and the alarm LEDs „Alarm 1/2“ light up and the measuring value is indicated on the LC display
(in the event of DC insulation faults, the faulty supply line is indicated). If the terminals R1/R2 are brid-
ged (external RESET button [NC contact] or wire bridge), the fault indication will be stored. Pressing the
RESET button, resets the insulation fault message, provided that the currently displayed insulation resis-
tance is at least 25% above the actual response value when the reset is carried out. The fault memory
behaviour can also be set in the „ISO SETUP“ menu, by selecting the sub menu Memory: on/off.
The connections for an external kΩ display supplied by the current output 0(4)…20 mA at M+/M- are
galvanically isolated.
*) measuring principle (adaptive measuring pulse)
a measuring principle developed by Bender (European Patent: EP 0 654 673 B1).
Self test
A self test can be carried out manually using the TEST button or automatically. In order to guarantee
high functional reliability, the ISOMETER® IRDH275BM-7 provides comprehensive self test functions.
After switching the supply voltage on, all internal measuring functions, the components of the process
control such as data and parameter memory as well as the earth connections are checked using the self
test functions. The progress of the self test is indicated on the LC display by a bar graph. Depending on
the conditions in the IT system to be monitored, the self test is running for 15…20 seconds, then the
message „Test ok!“ appears on the LC display for approximately 2 seconds. Then the device returns to
the standard mode and the current measuring value is displayed after the expiry of the measuring time.
When a fault is found at the terminals and KE, the message „!Error!“ appears on the LC display, the
system fault LED lights up, the relay K2 (21-22-24) switches and the respective fault message (see table)
is indicated. If such a system fault occurs, a self test is started again every minute. If no more malfuncti-
on is detected, the fault message is deleted automatically and the system fault LED extinguishes.

IRDH275BM-7_D00123_07_M_XXEN / 08/2020 11
ISOMETER® IRDH275BM-7
During operation, the self test function can be started by pressing the TEST button (internal or external).
The self test can also be started automatically every hour or every 24 hours by selecting „ISO
ADVANCED: Autotest“ menu. The alarm relays Alarm1/2 only switch after starting the self test function
by pressing the TEST button, that means if an automatic self test has been selected, the alarm relays do
not switch.
Alarmmeldung Beschreibung Maßnahmen
Connection PE? No low-resistance connection of
the terminals and KE to earth
(PE)
1. Check wiring of terminal and KE to earth (PE)
2. PressTEST button
3. Switch the supply voltage o and on
Device error x Internal device error 1. PressTEST button
2. Switch the supply voltage o and on
3. Contact Bender
i
If the on/off switching of the supply voltage is not possible for technical reasons, a RESET of the pro-
cess control can be carried out by pressing the „ESC“, „RESET“ and „MENU“ key.
Current output for external measuring instrument
The current output of the ISOMETER® provides 0(4)…20 mA. The current output is galvanically isolated
from the device electronics and the RS-485 interface. The ISO SETUP menu allows to switch over bet-
ween 0…20 mA and 4…20 mA.
Real-time clock
The real-time clock serves as a time base for the memory and self test functions. At first, the correct
time and date must be set in the menu „ISO ADVANCED“. If time and date are not set, a „C“ (clock) is
flashing in the standard display. In the event of a supply voltage failure, time and date will be stored for
at least thirty days.
If the 24 V test is activated in the „ISO ADVANCED“ menu, a special time of day can be selected for the
execution of the self test in the menu „TEST: 12:00“. Then a self test will be started automatically once a
day exactly at the preset time. If the 1 h auto test has been selected, the self test is automatically carried
out every full hour.
Function input F1/F2 to switch over to the standby mode
When the input terminals F1/F2 are bridged, the measuring function is stopped and the message
„STANDBY“ appears on the display. The currently measured value is blanked and the value > 10 MΩ is
indicated. The alarm relays and alarm LEDs no longer provide alarm messages. After opening the functi-
on input F1/F2, a completely new measuring cycle for insulation monitoring is started.

12 IRDH275BM-7_D00123_07_M_XXEN / 08/2020
Dimensions, installation and connection
3 Dimensions, installation and connection
3.1 Dimension diagrams
Dimension diagram IRDH275, all dimensions in mm Dimension diagram AGH675S-7, all dimensions in mm
3.2 Mounting IRDH275
DIN rail mounting according to DIN EN 60715/IEC 60715 or
Screw mounting by means of a plug-in trapezoidal support (Order No.: 990056)
3.3 Installation of the coupling device AGH675S-7…
I Danger of electric shock! The coupling device is operated with voltages above 1000 V, which can be
life-threatening in case of direct contact.
• For operation the coupling devices have to be installed into a „closed electrical operating
area“, refer to IEC 61800-5-1:2003
• The coupling device is to be installed in a place where the pollution degree to be expected is
≤ 2, refer to IEC 61800-5-1: 2003, subclause 4.2.6.2.2
• An „Enclosure suitable for high voltage areas“ has to be selected for installation, refer to IEC
61800-5-1: 2003
• The high voltage connection cable must not be directly routed on conductive surfaces that
are connected to earth. This avoids partial discharges and prevents damage to the insulation
of the high voltage cable between the AGH and the system to be monitored! Either additional
insulation layers are required or a clearence of ≥ 10 cm between the cable and the conductive
surfaces has to be provided.
AGH675S-7…
220
320
155
280
30
10
48
> 78
> 146
200
178
52
60
ø M4
ø 8
R > 64
83

IRDH275BM-7_D00123_07_M_XXEN / 08/2020 13
ISOMETER® IRDH275BM-7
3.4 Wiring diagrams (by way of example)
Wiring AGH675S-7
US
14
1
6
5
4
32
13121110987

14 IRDH275BM-7_D00123_07_M_XXEN / 08/2020
Dimensions, installation and connection
Wiring AGH675S-7MV15
Legend wiring diagrams
1 Supply voltage Us(see nameplate) via 6 A fuse
2, 3 Terminals L1, L2 are not connected!
4 Connection to the coupling device AGH675S-7 or the two coupling devices AGH675S-7MV15:
connect terminal AK to terminal(s) 5 of the coupling device AGH675S-7 (or the two coupling devices AGH675S-7MV15), connection
with standard low-voltage cable, maximum voltage at terminal 5: 200V
5Separate connection of and KE to PE
6 Separate connection of the terminals 3 and 4 of the AGH675S-7 or AGH675S-7MV15 to PE
7 External TEST button (NO contact)
8 External RESET button (NC contact or wire jumper), when the terminals are open, the fault message will not be stored
9 STANDBY by means of the function input F1, F2:
When the contact is closed, insulation measurement does not take place.
10 Current output, galvanically separated: 0…20 mA or 4…20 mA
US
AGH675S-7MV15AGH675S-7MV15
15,5 kV
DC 15,5 kV
AC/DC15,5 kV AC/DC
22
14
1
6
5
4
32
13121110987

IRDH275BM-7_D00123_07_M_XXEN / 08/2020 15
ISOMETER® IRDH275BM-7
11 Serial interface RS-485 (termination 120  resistor)
12 Alarm relay 1; changeover contacts provided
13 Alarm relay 2 (system fault relay); changeover contacts provided
14 Connection of the coupling device AGH675S-7 to the converter: connect the high voltage cable encapsulated on one end to the
mid-point of the DC intermediate circuit.
Connection of the two coupling devices AGH675S-7MV15 to the converter: connect the high voltage cable encapsulated on L+ and
L-.
i
Connect the terminals A1/+ and A2/- to the supply voltage Us in accordance with IEC 60364-4-43.
The connections to the supply voltage shall be provided with protective devices to afford protection
in the event of a short circuit (a 6 A fuse is recommended).
For UL and CSA applications, the use of 5 A fuses is mandatory.
i
Only one ISOMETER® may be connected to an external TEST or RESET button. The TEST and RESET
button for collective testing of several insulation monitoring devices must not be connected in paral-
lel. External coupling device connected via the terminal AK cannot be switched off via the internal
coupling relays.

16 IRDH275BM-7_D00123_07_M_XXEN / 08/2020
Operation and setting
4 Operation and setting
4.1 Operating features and displays IRDH275BM-7
1 INFO key: to query standard information /
ESC key: back to the menu function, conrmation parameter change
2 TEST button: to call up the self test/
Up key: parameter change, moving up in the menu
3 RESET button: to delete insulation fault alarms
Down key: parameter change, moving down in the menu
4 MENU key: to activate the menu system / Enter key: conrmation parameter change
5 Alarm LED 1 lights: insulation fault, rst warning level reached
6 Alarm LED 2 lights: insulation fault, second warning level reached
7 System fault LED lights: IRDH275 defective
8 Two-line display for standard and menu mode
4.1.1 Display in the standard mode
1 Indication of the insulation resistance in k
2 Additional information about the insulation:
„+“ = insulation fault L+
„–“ = insulation fault L–
„s“ = new measurement has started
3= polarity of the measuring
. = valid bus communication
H = new entry in the memory data
C = ashing, clock is to be
4 Messages:
• Insulation fault
• Connection PE?
• Device error x
• *****STAND*****
ISOMETER®
IRDH275
7
6
5
4
3
2
1
8
Insulation Fault

IRDH275BM-7_D00123_07_M_XXEN / 08/2020 17
ISOMETER® IRDH275BM-7
4.1.2 Display in the menu mode
1
Parameter change is permitted
2Parameter change is blocked, enabling by a password
4.1.3 Function keys
Two functions are assigned to each function key. In addition to the basic function marked with a circle,
all the keys allow navigation within the menu.
Function keys Basic function Navigation within the menu
Retrieval of:
• Device name, firmware version
• Response values Alarm 1 and Alarm 2
• Setup status (for details refer to the table of
the status numbers)
• COM-Setup (own bus address)
Please have the details above on hand if you have
a problem and if you contact Bender for technical
questions..
Returning from a sub menu to the previous menu. If
you do not exit the menu, the device automatically
returns to the standard mode again after approxima-
tely ve minutes..
Starts the ISOMETER® self test. Moving up in the menu, increasing a parameter
Resets insulation and fault alarm messages stored in the
ISOMETER®
Moving down in the menu, reducing a parameter
Calling up the menu system Selecting a menu item or sub menu item, conrming
or storing a parameter change and going back to the
associated sub menu item or going to the next input
area..
The memory function is only available after activating the fault memory in the ISO SETUP menu or after
bridging the terminals R1/R2. Furthermore, the ISOMETER® can only be reset when the present insulati-
on value is 25 % higher than the set response value.
1
2

18 IRDH275BM-7_D00123_07_M_XXEN / 08/2020
Operation and setting
4.2 Menu structure and menu mode
In the following menu diagrams these symbols are used for the
sake of clarity:
Switchover to the menu mode
After pressing the MENU key, you can change from the standard mode to the menu mode. From the
menu mode you can link to the different sub menus.
Navigation within the menu
Select the desired menu item using the UP/DOWN keys. The selected menu item is indicated by a flas-
hing cursor. Press the ENTER key to open the associated sub menu.
Use the UP/DOWN keys again to select the desired parameters. Move the cursor to the edit field by
pressing the ENTER key. If you have reached the end of the main menu list, it will be indicated by the
„Arrow UP“ symbol.
Changing the parameters
When password protection is activated, indicated by the symbol „padlock closed “ , the first thing to
enter is the correct password before the parameters can be changed using the UP/DOWN keys.
Entering the correct password once allows all parameters to be changed as long as you do not leave
the menu.
Changing the parameter usually has an immediate effect on the measuring and alarm functions. The
changed parameter is stored in a volatile memory by pressing the ENTER or ESC key after returning to
the sub menu (flashing cursor in column 1). During menu operations, all measuring and alarm functions
carry on working as usual in the background.
Changing from the menu mode to the standard mode
Pressing the ESC key allows fast changing from the menu mode to the standard mode. Thus, the menu
item „EXIT“ need not to be activated. Automatic switchover from the menu mode to the standard mode
takes place when no key is pressed for approximately five minutes in a main or sub menu.
ENTER
UP/DOWN
ESCAPE

IRDH275BM-7_D00123_07_M_XXEN / 08/2020 19
ISOMETER® IRDH275BM-7
4.2.1 Diagram menu structure
4.3 Menu HISTORY INFO
99 events with date and time stamp can be stored in the memory database. The database is designed
as a ring memory, i.e. the eldest entry is overwritten. Data is written into a non-volatile memory and
therefore provides protection against voltage failure.
Datarecord Event Display indication
1 Switch the supply voltage on Power on
2 Lowest measured insulation value Rmin
3...99 Response value Alarm 1 released Alarm 1
3...99 Response value Alarm 1 cleared Alarm 2
3...99 Response value Alarm 2 released Alarm 1
3...99 Response value Alarm 2 cleared Alarm 2
3...99 Error system connection released System connection?
3...99 Error system connection cleared System connection?
3...99 Error PE connection released PE connection?
3...99 Error PE connection cleared PE connection?

20 IRDH275BM-7_D00123_07_M_XXEN / 08/2020
Operation and setting
3...99 Device error released Device error
3...99 Device error cleared Device error
3...99 System reset (watchdog) System reset
Before storing the events with the actual date and time stamp, set the realtime clock in the ISO
ADVANCED menu.
The following function keys are provided to query data from the „HISTORY INFO“ menu: the UP/DOWN
keys to change the data record number, the ENTER key to change from the data record number to the
menu item „Clear all:on“ to delete the memory storage, and the ESC key to leave the menu.
A new entry into the memory is signalled with an „H“ on the display in the standard mode. The „H“ will
be deleted as soon as the „HISTORY INFO“ menu is called up.
4.3.1 Diagram HISTORY INFO
ESC