Bender A-ISOMETER IRDH275BU-6 User manual

Power in electrical safety
Operating Manual
A-ISOMETER® IRDH275BU-6
Coupling device AGH575S-6
Insulation monitoring device for medium voltage IT systems
with galvanically connected rectifiers and converters
up to AC/DC 3.6 kV
in combination with coupling device AGH575S-6
TGH1384en/06.2005

Dipl.-Ing. W. Bender GmbH & Co.KG
Londorfer Str. 65 • 35305 Grünberg • Germany
Postfach 1161 • 35301 Grünberg • Germany
Tel.: [phone]
Fax: [phone]
E-mail: [e-mail]
Web server: http://www.bender-de.com
© 2005 BENDER Germany
All rights reserved.
Reprinting only with permission
of the publisher.
Subject to change!

3
Table of Contents
TGH1384en/06.2005
1. Safety information .................................................................................. 7
1.1 Use for the intended purpose ............................................................................. 7
1.2 Warranty and liability ............................................................................................. 7
1.2.1 Personnel .................................................................................................................... 8
1.2.2 About the operating manual .............................................................................. 8
1.2.3 Hazards when handling the A-ISOMETER® or coupling device .............. 8
1.2.4 Inspection, transport and storage ..................................................................... 9
1.2.5 Note .............................................................................................................................. 9
1.3 Explanations of symbols and warnings ........................................................... 9
1.4 Directions for installation ................................................................................... 10
2. Function ................................................................................................. 11
2.1 Characteristics IRDH275BU-6 incl. AGH575S-6 ........................................... 11
2.2 Product description .............................................................................................. 12
2.3 Function ....................................................................................................................12
3. Installation and connection ............................................................... 17
3.1 Installation of the coupling device AGH575S-6 .......................................... 17
3.2 Wiring diagram ....................................................................................................... 17
4. Operation and setting ......................................................................... 21
4.1 Operating features and displays IRDH275BU-6 .......................................... 21
4.1.1 Display in the standard mode ........................................................................... 22
4.1.2 Display in the menu mode ................................................................................. 22
4.1.3 Function keys .......................................................................................................... 23
4.2 Menu structure and menu mode ..................................................................... 26
4.2.1 Diagram menu structure .................................................................................... 27
4.3 Menu HISTORY INFO ............................................................................................ 28

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4TGH1384en/06.2005
4.3.1 Diagram HISTORY INFO ....................................................................................... 29
4.4 Menu ISO SETUP:
Setting of the basic A-ISOMETER® functions ............................................... 30
4.4.1 Response values Alarm 1 and Alarm 2 ........................................................... 30
4.4.2 Operating principle of the alarm relays ......................................................... 30
4.4.3 Memory setting (on/off) ...................................................................................... 32
4.4.4 Current output for external measuring instruments ................................ 32
4.5 Menu ISO ADVANCED:
Setting of the extended functions .................................................................. 33
4.5.1 Coupling devices AGH: 575S-6 ......................................................................... 33
4.5.2 Adaptation to the system leakage capacitance Cemax .......................... 33
4.5.3 Measuring principle(Measure: AMP) .............................................................. 33
4.5.4 Setting the repitition time for automatic self tests (Autotest: 24h) .... 33
4.5.5 Setting the real-time clock (Clock) .................................................................. 33
4.5.6 Setting the date (Date) ........................................................................................ 33
4.5.7 Specifying the starting time of the automatic self test
(Test) (IRDH275B) ................................................................................................... 33
4.5.8 Diagram ISO ADVANCED .................................................................................... 34
4.6 Menu COM SETUP:
Setting the BMS interface ................................................................................... 35
4.6.1 Bus address „Addr:“ ............................................................................................... 35
4.6.2 Diagram COM SETUP ............................................................................................ 35
4.7 Menu PASSWORD .................................................................................................. 36
4.7.1 Activating and setting the password ............................................................. 36
4.7.2 Diagram PASSWORD ............................................................................................ 36
4.8 Menu LANGUAGE ................................................................................................. 37
4.8.1 Setting the national language .......................................................................... 37
4.8.2 Diagram Language ............................................................................................... 37
4.9 Menu SERVICE ......................................................................................................... 38
4.10 Parameterization via Internet ........................................................................... 38
5. Serial interfaces ..................................................................................... 39
5.1 RS485 interface with BMS protocol ................................................................. 39
5.2 Topology RS485 network ................................................................................... 40

Table of Contents
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TGH1384en/06.2005
5.2.1 Correct arrangement ............................................................................................ 40
5.2.2 Wrong arrangement ............................................................................................. 40
5.2.3 Wiring ......................................................................................................................... 40
5.3 BMS protocol ........................................................................................................... 41
5.3.1 BMS Master .............................................................................................................. 41
5.3.2 BMS Slave .................................................................................................................42
5.3.3 Commissioning of an RS485 network with BMS protocol ...................... 43
6. Technical data IRDH275BU-6 with AGH575S-6 .............................. 45
6.1 Data in tabular IRDH275BU-6 ............................................................................ 45
6.2 Data in tabular AGH575BU-6 ............................................................................. 48
6.3 Standards and approvals .................................................................................... 49
6.4 Characteristic curves ............................................................................................ 50
6.5 Ordering details ..................................................................................................... 56
6.5.1 A-ISOMETER® and coupling device ................................................................. 56
6.5.2 Measuring instruments ....................................................................................... 56
6.5.3 Label for modified versions ............................................................................... 56

Table of Contents
6TGH1384en/06.2005

7
TGH1384en/06.2005
1. Safety information
1.1 Use for the intended purpose
The A-ISOMETER® with an additional coupling device is intended for:
 monitoring the insulation resistance of IT systems
Any other use, or any use which goes beyond the foregoing, is deemed to
be use other than for the intended purpose. The BENDER companies shall
not be liable for any losses or damage arising therefrom.
Use for the intended purpose also includes
 compliance with all information in the operating instructions, and
 compliance with test intervals.
As a basic priciple, our "General conditions of Sale and Delivery" shall apply.
At the latest, these shall be available to the operator when the contract is con-
cluded.
1.2 Warranty and liability
Warranty and liability claims in cases of damage to persons and property
shall be excluded if they are attributable to one or more of the following
causes:
 Use of the A-ISOMETER® or the coupling device other than for the intended
purpose
 Incorrect assembly or installation, commissioning, operation and mainte-
nance of the A-ISOMETER®incl. coupling device.
 Failure to comply with the information in the operating instructions regard-
ing transport, commissioning, operation and maintenance of the A-ISOME-
TER® incl. coupling device.
 Unauthorized structural modifications to the A-ISOMETER® or coupling device.
 Failure to comply with the technical data
 Improperly executed repairs, and the use spare parts or accessories which are
not recommended by the manufacturer.
 Cases of disaster and force majeure
 Assembly and installation with device combinations not recommended.

Safety information
8TGH1384en/06.2005
This operating manual, especially the safety information, must be observed
above all by personnel who work on the A-ISOMETER® or the coupling device.
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 staff may work on the devices. 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 in-
formation in this operating manual.
1.2.2 About the operating manual
This operating manual has been compiled with the greatest possible care.
Nevertheless, errors and mistakes cannot be entirely ruled out. The BENDER
companies assume no liability whatsoever for any injury to persons or dam-
age to property which may be sustained as a result of faults or errors in this
operating manual.
1.2.3 Hazards when handling the A-ISOMETER®or coupling device
The devices are constructed according to the state-of-the-art and recognized
technical safety 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 ef-
fects on the A-ISOMETER®s incl. coupling devices or on other valuable prop-
erty. The A-ISOMETER® incl. coupling device must only be used:
 for the purpose for which it is intended
 when it is in perfect technical condition as far as safety is concerned
Any faults which may impair safety must be eliminated immediately. Imper-
missible modifications and the use of spare parts and additional devices
which are not sold or 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
A-ISOMETER® incl. coupling device. Warning signs must always be easily
legible. Damaged or illegible signs must be replaced immediately.

Safety information
9
TGH1384en/06.2005
1.2.4 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 immediate-
ly.
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
maintained.
1.2.5 Note
Make sure that the operating voltage is correct!
Prior to insulation and voltage tests, the A-ISOMETER® incl. coupling device
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 A-ISOMETER® incl. coupling device.
1.3 Explanations of symbols and warnings
The following symbols are used in BENDER documentation to draw atten-
tion to important information and to make it easier to find certain text pas-
sages.
The following examples explain the meaning of the symbols:
The "Attention" symbol is used to draw attention to information
warning employees of hazardous situations.
Information you should know for correct handling of the product is
marked with the "Info" symbol.

Safety information
10 TGH1384en/06.2005
1.4 Directions for installation
The terminals and KE shall be connected by a separate wire to the pro-
tective 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).
In order to check the proper connection of the device, it is recommended to
carry out a functional test using a genuine earth fault, e.g. via a suitable re-
sistance, before starting the device.
The devices, variant -6.. are delivered with the following factory setting:
Please check if the basic setting of the A-ISOMETER®complies with the re-
quirements of the system to be monitored.
Only one insulation monitoring device may be used in each intercon-
nected IT system.
When insulation or voltage test are to be carried out, the device shall
be isolated from the system for the test period.
ISO SETUP Alarm 1 / Alarm 2
(response values)
=2MΩ/ 100 kΩ
ISO SETUP Operating principle K1/K2 = N/O operation
ISO SETUP Memory = off
ISO ADVANCED System leakage capacitance = 5 μF
ISO ADVANCED Coupling device = AGH: 575S-6
COM SETUP Bus address = 3 (slave)
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 od 5...10 mA.

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TGH1384en/06.2005
2. Function
2.1 Characteristics IRDH275BU-6 incl. AGH575S-6
 Device combination for use in medium voltage systems with converters up to
AC/DC 3.6 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)
 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
(RS485 electrically isolated).
 Current output 0(4)...20mA (galvanically separated) in relation to the meas-
ured insulation value.
 Remote setting of certain parameters via the Internet (option; FTC470XET
additionally required)

Function
12 TGH1384en/06.2005
2.2 Product description
The A-ISOMETER® IRDH275BU-6 and coupling device AGH575S-6 monitor
the insulation resistance of IT medium voltage systems up to 3.6 kV. It is suit-
able 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-control-
led DC drives. Drive systems including a converter and a motor in medium
voltage systems can be monitored. When the AGH575S-6 is connected in the
mid-point of the converter DC intermediate circuit, a maximum of ±3.6 kV
against PE may occur. The device automatically adapts itself to the existing
system leakage capacitance.
The IRDH275BU-6 can be used in combination with a control and indication
panel, e.g. PRC1470 version 2 or higher, on the BMS (BMS = Bender Meas-
uring Device Interface) bus.
2.3 Function
The combination A-ISOMETER® IRDH275BU-6 and coupling device
AGH575S-6 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 non-
volatile memory (EEPROM) after the setting is completed.
A microprocessor-controlled pulsating AC measuring voltage is superim-
posed on the IT system to be monitored ( measuring principle*). The
measuring cycle consists of positive and negative pulses of the same ampli-
tude. 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 cir-
cuit. From the measured current value, the microprocessor calculates the in-
sulation resistance which is indicated on the LC display or the external kOhm
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 as-
sociated alarm relays respond and the alarm LEDs "Alarm 1/2“ light up and

Function
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TGH1384en/06.2005
the measuring value is indicated on the LC display (in the event of DC insu-
lation faults, the faulty supply line is indicated). If the terminals R1/R2 are
bridged (external RESET button [NC contact] or wire bridge), the fault indi-
cation 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 select-
ing the sub menu Memory: on/off.
The connections for an external kΩdisplay 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 automatical-
ly. In order to guarantee high functional reliability, the A-ISOMETER®
IRDH275BU-6 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 condi-
tions in the IT system to be monitored, the self test is running for 15...20 sec-
onds, 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!" ap-
pears 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 mal-
function is detected, the fault message is deleted automatically and the sys-
tem 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 hours by selecting "ISO ADVANCED: Autotest" menu.
The alarm relays Alarm1/2 only switch after starting the self test function by

Function
14 TGH1384en/06.2005
pressing the TEST button, that means if an automatic self test has been se-
lected, the alarm relays do not switch.
Current output for external measuring instrument
The current output of the A-ISOMETER® provides 0(4)...20 mA. The current
output is galvanically isolated from the device electronics and the RS485 in-
terface. The ISO SETUP menu, on page 31, 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 func-
tions. At first, the correct time and date must be set in the menu "ISO AD-
VANCED". 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:
Error message Meaning Steps to be taken
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. Press TEST button
3. Switch the supply voltage off and
on
Device error x Internal device
error
1. Press TEST button
2. Switch the supply voltage off and
on
3. Contact BENDER
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 "ESC“, "RESET“ and "MENU“ key.

Function
15
TGH1384en/06.2005
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
function input F1/F2, a completely new measuring cycle for insulation mon-
itoring is started.

Function
16 TGH1384en/06.2005

17
TGH1384en/06.2005
3. Installation and connection
3.1 Installation of the coupling device AGH575S-6
 For operation the coupling device has to be installed into a "closed electrical
operating area", refer to IEC 61800-5-1
 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 installa-
tion, refer to IEC 61800-5-1: 2003
 Make sure that the clearance between terminal 2 and the conductive parts of
the enclosure used for the installation of the coupling device is at least
77 mm.
3.2 Wiring diagram
Connect the terminals A1/+ and A2/- to the supply voltage Usin accordance
with IEC 60364-4-43. The connections to the supply voltage shall be provid-
ed with protective devices to afford protection in the event of a short circuit
(a 6 A fuse is recommended).
For the connection to the IT system to be monitored via the coupling device
AGH575S-6, devices for protection against short-circuit in conformity with
IEC 60364-4-43 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).
Only one A-ISOMETER® may be connected to an external TEST or RESET
button. The TEST and RESET button for collective testing of several insula-
tion monitoring devices must not be connected in parallel.
External coupling device connected via the terminal AK cannot be switched
off via the internal coupling relays.
The coupling device is operated with voltages above 1000 V! Please
observe the instruction for installation below.

Installation and connection
18 TGH1384en/06.2005
2
54
AGH575S-6
3
- /~
+/~
PE
3 AC 3,6 k
L +
0
M
3~
DC +3,6 k
DC -3,6 k
5
A1/+ A2/- L1 L2 AK KE
T1 T2 R1 R2 F1 F2 M+ M- A B 11 12 14 21 22 24
IRDH275BU-6
mA
120W
K1 K2
1
7 8 9 10 11 12 13
Us
L

23 4
6
14

Installation and connection
19
TGH1384en/06.2005
Legend to wiring diagram:
The wiring diagram before is to be taken by way of example.
1Supply voltage Us (see nameplate) via 6 A fuse
2, 3 Terminals L1, L2 are not connected!
4Connection to the coupling device AGH575S-6:
connect terminal AK to terminal 5 of the coupling device.
5Separate connection of and KE to PE
6Separate connection of the terminals 3 and 4 of the AGH575S-6 to PE
7External TEST button (NO contact)
8External RESET button (NC contact or wire jumper),
when the terminals are open, the fault message will not be stored
9STANDBY 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
11 Serial interface RS485 (termination 120 Ωresistor)
12 Alarm relay 1; changeover contacts provided
13 Alarm relay 2 (system fault relay); changeover contacts provided
14 Connection of the coupling device to the converter:
Terminal 2 to the mid-point of the DC intermediate circuit

Installation and connection
20 TGH1384en/06.2005