Bender ISOMETER IRDH375, ISOMETER IRDH375B User Manual
ISOMETER® IRDH375
Insulation monitoring device for
IT AC systems with galvanically connected
rectifiers and converters
and for IT DC systems
IRDH375: Software-Version D0183 V1.8
IRDH375B: Software-Version D0184 V1.8
IRDH375B
IRDH375_D00124_05_M_XXEN/01.2020
Manual EN
Table of Contents
1. Important information .................................................................................... 7
1.1 How to use this manual ................................................................................. 7
1.2 Technical support: service and support ................................................... 8
1.2.1 First level support ............................................................................................. 8
1.2.2 Repair service ..................................................................................................... 8
1.2.3 Field service ........................................................................................................ 9
1.3 Training courses ............................................................................................. 10
1.4 Delivery conditions ....................................................................................... 10
1.5 Inspection, transport and storage ........................................................... 10
1.6 Warranty and liability ................................................................................... 11
1.7 Disposal ............................................................................................................ 12
2. Safety instructions ......................................................................................... 13
2.1 General safety instructions ........................................................................ 13
2.2 Work activities on electrical installations ............................................. 13
2.3 Device-specific safety information ......................................................... 14
2.4 Intended use ................................................................................................... 16
2.5 Directions for installation ........................................................................... 17
3. Function ........................................................................................................... 19
3.1 Common characteristics (IRDH375 and IRDH375B) .......................... 19
3.2 Additional characteristics IRDH375B ...................................................... 20
3.3 Product description ...................................................................................... 20
3.4 Function ............................................................................................................ 21
3.4.1 Self test .............................................................................................................. 22
3.4.2 Relay K3: device fault alarm and EDS common message ............... 23
3.5 Additional functions IRDH375B ............................................................... 25
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Table of Contents
4. Commissioning flow chart (threepart) ...................................................... 30
5. Connection ..................................................................................................... 33
5.1 Wiring ................................................................................................................ 33
5.2 Wiring diagrams with coupling devices ................................................ 37
5.2.1 Connection with AGH150W-4 .................................................................. 37
5.2.2 Connection with AGH520S ........................................................................ 39
5.2.3 Connection with AGH204S-4 .................................................................... 40
6. Operation and setting .................................................................................. 42
6.1 Operating features and displays IRDH375(B) ...................................... 42
6.1.1 Display in the standard mode ................................................................... 43
6.1.2 Display in the menu mode ......................................................................... 44
6.1.3 Function keys .................................................................................................. 44
6.2 Menu structure and menu mode ............................................................ 47
6.2.1 Diagram menu structure ............................................................................ 49
6.3 Menu HISTORY INFO (IRDH375B) ............................................................ 50
6.3.1 Diagram HISTORY INFO (IRDH375B) ....................................................... 51
6.4 Menu ISO SETUP: Setting of the basic ISOMETER® functions ........ 52
6.4.1 Response values Alarm 1 and Alarm 2 ................................................... 52
6.4.2 Operating principle of the alarm relays ................................................ 52
6.4.3 Memory setting (on/off) .............................................................................. 55
6.4.4 Current output for external measuring instruments
(IRDH375B) ....................................................................................................... 55
6.5 Menu ISO ADVANCED: Setting of the extended functions ........... 56
6.5.1 External coupling devices (AGH: no) ...................................................... 56
6.5.2 Adaptation to the system leakage capacitance
(Cemax : 150 μF) ............................................................................................. 57
6.5.3 Changing the measuring principle from AMP to DC
(Measure: AMP) .............................................................................................. 57
6.5.4 Setting the repetition time for automatic self tests
(Autotest: 24h) ................................................................................................ 57
6.5.5 Setting the real-time clock (Clock) (IRDH375B) .................................. 58
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Table of Contents
6.5.6 Setting the date (Date) (IRDH375B) ........................................................ 58
6.5.7 Specifying the starting time of the automatic self test (Test)
(IRDH375B) ....................................................................................................... 58
6.5.8 Diagram ISO ADVANCED ............................................................................ 59
6.6 Menu COM SETUP: Setting the BMS interface .................................... 60
6.6.1 Bus address „Addr:“ (IRDH375B) ............................................................. 60
6.6.2 ISOnet function (IRDH375B) ...................................................................... 60
6.6.3 ISO monitor (IRDH375B) ............................................................................. 61
6.6.4 Diagram COM SETUP (IRDH375B) ........................................................... 62
6.7 Menu PASSWORD ......................................................................................... 63
6.7.1 Activating and setting the password ..................................................... 63
6.7.2 Diagram PASSWORD .................................................................................... 64
6.8 Menu LANGUAGE .......................................................................................... 65
6.8.1 Setting the national language .................................................................. 65
6.8.2 Diagram Language ....................................................................................... 66
6.9 Menu SERVICE ................................................................................................ 66
6.10 Parameterization via Internet ................................................................... 67
7. Serial interfaces .............................................................................................. 68
7.1 RS-485 interface with IsoData protocol (IRDH375) ........................... 68
7.2 RS-485 interface with BMS protocol (IRDH375B) ............................... 70
7.3 Topology RS-485 network (IRDH375B) .................................................. 71
7.3.1 Correct arrangement ................................................................................... 71
7.3.2 Wrong arrangement .................................................................................... 71
7.3.3 Wiring ................................................................................................................ 71
7.4 BMS protocol (IRDH375B) .......................................................................... 72
7.4.1 BMS Master ...................................................................................................... 73
7.4.2 BMS Slave ......................................................................................................... 74
7.4.3 Commissioning of an RS-485 network with BMS protocol ............ 75
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Table of Contents
8. Factory Settings ............................................................................................. 77
9. Technical data IRDH375(B) .......................................................................... 79
9.1 Data in tabular form ..................................................................................... 79
9.2 Standards, approvals and certifications ................................................ 83
9.3 Characteristic curves .................................................................................... 84
9.4 Ordering details ............................................................................................. 91
9.4.1 ISOMETER® ....................................................................................................... 91
9.4.2 Dust protection .............................................................................................. 92
9.4.3 Coupling devices ........................................................................................... 93
9.4.4 Measuring instruments ............................................................................... 93
INDEX .................................................................................................................... 95
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1. Important information
1.1 How to use this manual
This manual is intended for qualified personnel working in
electrical engineering and electronics!
Always keep this manual within easy reach for future reference.
To make it easier for you to understand and revisit certain sections in this manual, we have used symbols to identify important instructions and information.
The meaning of these symbols is explained below:
This signal word indicates that there is a high risk of danger
that will result in electrocution or serious injury if not
DANGER
WARNING
CAUTION
avoided.
This signal word indicates a medium risk of danger that
can lead to death or serious injury if not avoided.
This signal word indicates a low-level risk that can result in
minor or moderate injury or damage to property if not
avoided.
IRDH375_D00124_05_M_XXEN/01.2020
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Important information
This symbol denotes information intended to assist the user
in making optimum use of the product.
1.2 Technical support: service and support
For commissioning and troubleshooting Bender offers you:
1.2.1 First level support
Technical support by phone or e-mail for all Bender products
• Questions concerning specific customer applications
• Commissioning
• Troubleshooting
Telephone: +49 6401 807-760*
Fax: +49 6401 807-259
In Germany only: 0700BenderHelp (Tel. and Fax)
E-mail: support@bender-service.de
1.2.2 Repair service
Repair, calibration, update and replacement service for Bender products
• Repairing, calibrating, testing and analysing Bender products
• Hardware and software update for Bender devices
• Delivery of replacement devices in the event of faulty or incorrectly
delivered Bender devices
• Extended guarantee for Bender devices, which includes an in-house
repair service or replacement devices at no extra cost
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IRDH375_D00124_05_M_XXEN/01.2020
Important information
Telephone: +49 6401 807-780** (technical issues)
+49 6401 807-784**, -785** (sales)
Fax: +49 6401 807-789
E-mail: repair@bender-service.de
Please send the devices for repair to the following address:
Bender GmbH, Repair-Service,
Londorfer Str. 65,
35305 Grünberg
1.2.3 Field service
On-site service for all Bender products
• Commissioning, configuring, maintenance, troubleshooting of Bender
products
• Analysis of the electrical installation in the building (power quality test,
EMC test, thermography)
• Training courses for customers
Telephone: +49 6401 807-752**, -762 **(technical issues)
+49 6401 807-753** (sales)
Fax: +49 6401 807-759
E-mail: fieldservice@bender-service.de
Internet: www.bender-de.com
*Available from 7.00 a.m. to 8.00 p.m. 365 days a year (CET/UTC+1)
**Mo-Thu 7.00 a.m. - 8.00 p.m., Fr 7.00 a.m. - 13.00 p.m.
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Important information
1.3 Training courses
Bender is happy to provide training regarding the use of test equipment.
The dates of training courses and workshops can be found on the Internet at
www.bender-de.com -> Know-how -> Seminars.
1.4 Delivery conditions
Bender sale and delivery conditions apply.
For software products the "Softwareklausel zur Überlassung von StandardSoftware als Teil von Lieferungen, Ergänzung und Änderung der Allgemeinen
Lieferbedingungen für Erzeugnisse und Leistungen der Elektroindustrie"
(software clause in respect of the licensing of standard software as part of deliveries, modifications and changes to general delivery conditions for products and services in the electrical industry) set out by the ZVEI (Zentralverband
Elektrotechnik- und Elektronikindustrie e. V.) (German Electrical and Electronic Manufacturer's Association) also applies.
Sale and delivery conditions can be obtained from Bender in printed or electronic format.
1.5 Inspection, transport and storage
Inspect the dispatch and equipment packaging for damage, and compare the
contents of the package with the delivery documents. In the event of damage
in transit, please contact Bender immediately.
The devices must only be stored in areas where they are protected from dust,
damp, and spray and dripping water, and in which the specified storage temperatures can be ensured.
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Important information
1.6 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:
• 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, commissioning, 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 and the use of replacement parts or
accessories not approved by the manufacturer.
• Catastrophes caused by external influences and force majeure.
• Mounting and installation with device combinations not recom-
mended by the manufacturer.
This operating manual, especially the safety instructions, must be observed by
all personnel working on the device. Furthermore, the rules and regulations
that apply for accident prevention at the place of use must be observed.
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Important information
1.7 Disposal
Abide by the national regulations and laws governing the disposal of this device. Ask your supplier if you are not sure how to dispose of the old equipment.
The directive on waste electrical and electronic equipment (WEEE directive)
and the directive on the restriction of certain hazardous substances in electrical and electronic equipment (RoHS directive) apply in the European Community. In Germany, these policies are implemented through the "Electrical and
Electronic Equipment Act" (ElektroG). According to this, the following applies:
• Electrical and electronic equipment are not part of household waste.
• Batteries and accumulators are not part of household waste and must
be disposed of in accordance with the regulations.
• Old electrical and electronic equipment from users other than private
households which was introduced to the market after 13 August 2005
must be taken back by the manufacturer and disposed of properly.
For more information on the disposal of Bender devices, refer to our
homepage at www.bender-de.com -> Service & support.
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2. Safety instructions
2.1 General safety instructions
Part of the device documentation in addition to this manual is the enclosed
"Safety instructions for Bender products".
2.2 Work activities on electrical installations
Only qualified personnel are permitted to carry out the
work necessary to install, commission and run a device or
system.
Risk of electrocution due to electric shock!
Touching live parts of the system carries the risk of:
• An electric shock
DANGER
If the device is used outside the Federal Republic of Germany, the applicable
local standards and regulations must be complied with. The European standard EN 50110 can be used as a guide.
• Damage to the electrical installation
• Destruction of the device
Before installing and connecting the device, make sure
that the installation has been de-energised. Observe the
rules for working on electrical installations.
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2.3 Device-specific safety information
Children and unauthorised persons must not have access to
or contact with the ISOMETER®.
WARNING
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.
CAUTION
CAUTION
In order to check the correct connection of the device, a
functional test has to be carried out before starting the
system.
Make sure that the basic settings meet the requirements of
the IT system.
In the event of an alarm message of the ISOMETER®, the
insulation fault should be eliminated as quickly as possible.
Safety instructions
14
If the ISOMETER® is installed inside a control cabinet, the
insulation fault message must be audible and/or visible to
attract attention.
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Safety instructions
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
coupled via diodes or capacitances may also influence the
insulation monitoring process so that a central control of the
different ISOMETER®s is required.
Prevent measurement errors!
When a monitored IT system contains galvanically coupled
DC circuits, an insulation fault can only be detected correctly
if the rectifier valves (e.g. rectifier diode, thyristors, IGBTs,
frequency inverters, …) carry a minimum current of > 10 mA.
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,
continuous insulation monitoring is also possible in this
frequency range.
There is no influence on the insulation 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).
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Safety instructions
2.4 Intended use
The ISOMETER® is intended for:
monitoring the insulation resistance of IT systems
Use for the intended purpose also includes
compliance with all information in the operating instructions
and
compliance with test intervals.
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.
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Safety instructions
2.5 Directions for installation
Risk of property damage due to unprofessional
installation!
If more than one insulation monitoring device is connected
CAUTION
CAUTION
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).
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.
Ensure disconnection from the IT 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.
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.
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Safety instructions
Prevent measurement errors!
When an AC system includes galvanically connected DC
circuits, the following shall be considered: Insulation faults
in DC circuits can only be monitored correctly when the
rectifiers carry a continuous load of 5…10 mA.
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3. Function
3.1 Common characteristics (IRDH375 and IRDH375B)
ISOMETER® for IT AC systems with galvanically connected rectifiers
and for IT DC systems (IT = unearthed systems)
The operating range of the nominal voltage U
coupling devices.
Automatic adaptation to the existing system leakage capacitance
measuring principle (European Patent: EP 0 654 673 B1)
Two separately adjustable ranges of the response value1 kΩ …10 MΩ
(Alarm 1, Alarm 2)
Two-line LC display
Connection monitoring (monitoring of the measuring leads)
Automatic device self test
Option "W":
This option provides: improved shock and vibration resistance for use
in ships, on rolling stock and in seismic environment.
can be extended via
n
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Function
3.2 Additional characteristics IRDH375B
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).
Internal disconnection of the ISOMETER from the IT system to be moni-
tored (using a control signal; terminals F1/F2) , e.g. if several
ISOMETER®s are interconnected.
Current output 0(4)…20 mA (galvanically separated) in relation to the
measured insulation value.
Remote setting of certain parameters via the Internet (option; COM465
additionally required)
3.3 Product description
The ISOMETER® type IRDH375 monitors the insulation resistance of IT systems.
It is suitable for universal use in 3NAC, AC/DC and DC systems. AC systems
may include extensive DC supplied loads, such as converters or thyristor-controlled DC drives. The device automatically adapts itself to the existing system
leakage capacitance.
Suitable coupling devices are available to extend the nominal voltage range
.
U
n
The IRDH375B can be used in combination with a control and indicating device, e.g. PRC1470 version 2 or higher, on the BMS (BMS = Bender Measuring
Device Interface) bus.
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Function
3.4 Function
The ISOMETER® IRDH375 is connected 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 pulses of the same amplitude. The period of these pulses depends on the respective system leakage
capacitances 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 display or the external kΩ
measuring instrument.
The measuring time 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.
If the reading is below the selected response values Alarm 1/Alarm 2, the associated alarm relays respond 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 bridged
(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 resistance 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 external kΩ display supplied by the current output
0…400 μA or 0(4)…20 mA (IRDH375B) at M+/M- are galvanically isolated.
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Function
*) measuring principle "adaptive measuring pulse", a measuring
principle developed by Bender (European Patent: EP 0 654 673 B1).
3.4.1 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® IRDH375 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 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 conditions in the IT system to be monitored, the self test is running for 15…20 s, then the message
"Test ok!“ appears on the LC display for approximately 2 s. Then the device returns to normal measuring mode and the current measuring value is displayed after the expiry of the measuring time.
When a device or connection fault is found, the message "!Error!" appears on
the display, the device fault LED lights up, the relay K3 (31-32-34) switches and
the respective fault message (see table) is indicated. If such a device fault occurs, a self test is started again every minute. If no more malfunction is detected, the fault message is deleted automatically and the device fault LED
extinguishes.
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 h by selecting "ISO ADVANCED: Autotest" menu.
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Function
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.
3.4.2 Relay K3: device fault alarm and EDS common message
Rel ay K3 is in tended t o sig nal d evice an d con nect ion e rrors of th e ISO METER®.
K3 is permanently set to N/C operation, with the contacts 31-34 normally
closed, that means when a fault occurs, the relay deenergizes (K3: 31-32 connected).
Further details are described in "Chapter 3.4.1 Self test".
The settings for K3 are preset and cannot be adjusted.
Behaviour of the analogue output
Setting Manual test Automatic test
0-20 mA 20 mA
while test procedure
4-20 mA 20 mA
while test procedure
0 mA
The current value depends
on the insulation value
4 mA
The current value depends
on the insulation value
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Error message Meaning Steps to be taken
Function
System
connection?
Connection PE? No low-resis-
Device error x Internal device
No low-resistance connection of terminals
L1, L2 to the IT
system
tance connection of the
terminals
and KE to earth
(PE)
error
If the on/off switching of the supply voltage is not possible
for technical reasons, a RESET of the process control can be
carried out by pressing the "INFO“, "RESET“ and "MENU“ key.
1. Check the wiring of
terminal L1, L2 to the IT
system.
2. Press the test button.
3. Switch the supply voltage
off and on.
4. Check the fuses.
1. Check wiring of terminal
and KE to earth (PE).
2. Press TEST button.
3. Switch the supply voltage
off and on.
1. Press TEST button.
2. Switch the supply voltage
off and on.
3. Contact Bender.
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Function
3.5 Additional functions IRDH375B
Current output for external measuring instrument
The current output of IRDH375B provides 0(4)…20 mA. The current output is
galvanically isolated from the device electronics and the RS-485 interface. The
ISO SETUP menu, on page 43, allows to switch over between 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 h selftest 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.
Interconnected IT systems
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 and deactivated via a control system. IT systems coupled via diodes or capacitances may also influence the insulation monitoring
process. Hence, also in this case a central control of the different ISOMETER®s
is required.
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Function
Function input F1/F2 for connection or disconnection of
IT systems being monitored
The ISOMETER® can be disconnected from the IT system and set to STANDBY
mode with the function input F1/F2. If the input F1/F2 is bridged, the connections L1/L2 are switched off via internal coupling relays, the measuring function is stopped and the message "STANDBY" appears on the display. Software
version 1.4 or higher does not indicate the measured insulation resistance
during the disconnection, but indicates the value > 10 MΩ. Furthermore, the
alarm relays and alarm LEDs no longer provide alarm messages. After opening
the function input F1/F2, the connection to the IT system will be restored and
a completely new measuring cycle for insulation monitoring is started.
With this function, selective disconnection of an IRDH375B in interconnected
IT systems can be carried out via auxiliary contacts of the respective coupling
switch. One coupling switch each in a line-type or ring-type arrangement can
deactivate a subsequent IRDH375B. This arrangement guarantees that only
one ISOMETER® is active in each galvanically connected system. In a ring-type
arrangement with all coupling switches closed, it can be assumed that all
ISOMETER®s are deactivated. In order to prevent this, a BMS Master (IRDH375B
BMS address 1) monitors the condition of the function input F1/F2 of all Slave
ISOMETER®s.
When all Slave ISOMETER®s are in the STANDBY mode, the insulation monitoring function of the Master ISOMETER® and hence the function input F1/F2 of
the Master are without function in this mode.
Details are shown in the graphic below.
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IRDH375_D00124_05_M_XXEN/01.2020
BMS bus (A/B, RS485)
F1/F2
PE PE
PE PE
IT system 1 IT system 2
IT system 3IT system 4
G
G
G
G
Addr. 1
Addr. 2
Addr. 4
Addr. 3
IRDH375B
IRDH375B
IRDH375B
IRDH375B
F1/F2
F1/F2
F1/F2
Function
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27
Function
ISOnet Function (COM SETUP)
Select "ISOnet=ON" from the COM SETUP menu to activate this function. This
function is a type of scanning function. The BMS Master activated via the
ISOnet function controls the ISOnet Slave devices via the BMS bus. Once an
ISOMETER® has finished its measurement cycle, the authorization for measuring the insulation resistance is passed on from the ISOnet Master to the next
Slave. While an ISOMETER® is carrying out a measurement all other
ISOMETER®s are in the STANDBY mode. In this way it can be prevented that
the ISOMETER®s disturb each other in interconnected systems. In comparison
to the solution coupling switches and function input F1/F2, the response time
is prolonged, since no continuous measurement takes place. The advantage
is that no auxiliary contacts of a coupling switch are required. Furthermore,
this solution is ideally suited for capacitive IT systems or IT systems connected
via diodes.
An ISOnet Slave checks whether there is a Master available in the network. If
there is no Master available, the fault message "ISOnet Master?" appears on
the display after approximately 1 h. Additionally, the LED for device errors
lights and the Relay K3 switches. When the ISOnet function is activated, the
function input F1/F2 will be disconnected.
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IRDH375_D00124_05_M_XXEN/01.2020
BMS bus (A/B, RS485)
PE PE
PE PE
IT system 1 IT system 2
IT system 3IT system 4
G
G
G
G
Addr. 1
Addr. 2
Addr. 4
Addr. 3
IRDH375B
IRDH375B
IRDH375B
IRDH375B
Function
IRDH375_D00124_05_M_XXEN/01.2020
29
4. Commissioning flow chart (threepart)
Is the system to be monitored an
unearthed system (IT system)?
The IRDH375 is not suitable for this
application( contact BENDER).
Un is too high for direct
connection. A coupling device
providing the respective voltage
range must be connected.
Device connection
Optional device
connection
no
no
yes
The terminals L1 and L2 must be
connected to Un of the system to be
monitored according to the wiring diagram.
An external kW measuring instrument
at M+/M- with a display range of
10 kW...1000 kW,
Scale centre point: 120 kW
Output current IRDH375: 0...400 mA
Output current IRDH375B: 0/4...20 mA
Connect the supply voltage Us
to the terminals A1/+ and A2/-. Consider
the details indicated on the nameplate.
External TEST button (NO contact) to the
terminals T1 and T2
External RESET button (NC contact) to the
terminals R1 and R2
The output contacts of the alarm relays
System fault (31-32-34)
Alarm 1 (11-12-14)
Alarm 2 (21-22-24)
When using the RS485 interface, take care
that a 120 W resistor is connected at
the beginning and the end of the network.
Terminate IRDH...: S1 = ON
13
12
11
7
8
10
Deenergize the installation
before connecting the device!
Recommended wire cross section of
connecting cable
single wire 0.2...4 mm
2
flexible 0.2... 2.5 mm
2
Is the maximum nominal voltage
Un AC 793 V
or
Un
DC 650 V
yes
The two PE connections
and KE must
be connected separately to the
equipotential bonding.
6
2
3
4
5
1
The encircled figures in the flow chart correspond to the figures in the legend
to the wiring diagram.
Commissioning of the ISOMETER® (1)
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IRDH375_D00124_05_M_XXEN/01.2020
Commissioning flow chart (threepart)
Commissioning of the ISOMETER® (2)
The ISOMETER® carries out a
self test. The display indicates
the insulation value after finishing
the measurement.
IRDH375_D00124_05_M_XXEN/01.2020
31
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