Bender A-ISOMETER IRDH375 User manual

A-ISOMETER IRDH375
IRDH375B
Insulation monitoring device for
AC IT systems with galvanically
connected rectifiers and converters,
and for IT DC systems
(isolated systems)
Operating manual TGH1352E
A-ISOMETER® IRDH375
INFO TEST RESET MENU
ESC
12
k
Isolation Fe ler R =010K
Edition: January 2002

A-ISOMETER® IRDH375
INFO TEST RESET MENU
ESC
12
k
Isolation Fe ler R =010K
A-ISOMETER® IRDH375
RESET MENU
12
k
n Fe ler
R2R1
12
1 LC display 2 Info key, ESC key 3 TEST key, Scroll key 4 RESET key, Scroll key 5 Menu key, ENTER key 6 Alarm1 LED 7 Alarm2 LED 8 System fault LED 9 transparent cover
(accessories)
10 Current output 0...400 µA
or 0(4)...20 mA
11 external test key 12 external reset key 13 STANDBY input 14 RS485 termination (120 O m) 15 Output contact system fault 16 Output contact Alarm2 17 Output contact Alarm1 18 Terminal cover 19 Supply voltage Us 20 System connection 3AC 21 System connection 3/N/AC 22 System connection AC 23 System connection DC 24 Connection for external
coupling devices
25 Eart connection
9
1
S1
ON OFF
S2 S1
18
20
21
N
L1 L2 L3
3N AC system
L2L1
Un
Un
L1 L2 L3
3 AC system
L2L1
19
6 A fuse
A1+ A2-
10
M+ M-
-1,5
U
T
2
k
10
30
50
100
200
500
1000
F2
F1
13
21
22 24
T2
T1
11
B
A
14
2345 6 8
7
PE
KE
25
22
L1
L2
AC system
L2L1
Un
23
L+
L-
DC system
L2L1
Un
16
E
11
12 14
17
31
32 34
15
ear view I DH375
24
120 W

3
Commissioning
Putting the IRDH375 A-ISOMETER® into operation

4
Commissioning

5
Commissioning
In order to check the proper
connection, it is recommended
to carry out a functional test
by connecting an appropriate
resistance between the system
to be monitored and earth.
Value of the resistance:
50% of the lowest selected
response value Alarm2.
Check the connections with a
voltmeter!
Is system voltage Un applied to the
terminals 1/ 2?
If a coupling device is connected,
is it properly connected?
Check the voltage with a voltmeter!
yes
yes
Remove the resistance!
The IRDH375 is properly
connected and in
service condition!
Do both alarm EDs light?
Did the output relays trip?
yes
no
Do both alarm EDs light?
Did the output relays trip?
Are the alarm EDs
extinguished?
Did the output relays reset?
no

6

7
Contents
Connection 2
Commissioning 3
Safety information 9
Function
IRDH375, IRDH375B 15
Product description 16
Function 16
Real-time clock 17
Interconnected networks 18
Function input F1/F2 18
ISOnet 19
Self-test 20
Connection
Wiring diagram 22
Network decoupling 23
Connection with coupling devices 24
Operation with coupling device
AGH204S-4 25
Operation and setting
Operating elements and displays 26
Function keys 27
Menu structure 31
Setting of the basic functions
Diagram HISTORY INFO 32
HISTORY INFO 33
ISO SETUP 34
Response values Alarm1 and Alarm2 35
Operating principle of the alarm relays 35
Memory setting 35
Current output 35
Setting of the extended functions
Diagram ISO ADVANCED 36
Setting of the coupling devices 37
Adaptation to the system
leakage capacitance 37
Automatic self-test 37
Real-time clock 38
Date 38
Test 38
Setting COM SETUP 40
ISOnet function 41
Bus address 41
BMS monitor 41
Password setting 42
Setting the national language 43
Interface
Serial interface IRDH375 44
RS485 interface 45
Bender Measuring Interface 47
BMS Slave 48
BMS Master 49
Commissioning BMS network 49
Technical data
Technical data 50
Standards 53
Characteristic curves & status number
Response time 54
Max. AC voltage between
system and PE 55
Current outputs 56
Status number 58
Dimension diagram
Dimension diagram 58
Ordering details
Standard version 60
Accessories 61
Coupling devices 62
Measuring instruments for -4... 62
Label modified version 63

8
Dipl.-Ing. W. Bender GmbH & Co.KG
Postfach 1161 • 35301 Grünberg
Londorfer Straße 65 • 35305 Grünberg
Telefon [phone]
Fax [phone]
Internet: http://www.bender-de.com
E-Mail: [email protected]
Edition: 01.2002
Right to modifications reserved

9
Safety information
Use for the intended purpose
The A-ISOMETER®is intended exclusively for monitoring the insulation resi-
stance 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 contained in the operating instructions, and
• compliance with the inspection and test intervals and the calibration
intervals.
As a basic principle, our „General Conditions of Sale and Delivery“ shall apply.
At the latest, these shall be available to the operator when the contract is
concluded.
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®other than for the intended purpose
• incorrect assembly or installation, commissioning, operation and
maintenance of the A-ISOMETER®
• failure to comply with the information in the operating instructions
regarding transport, commissioning, operation and maintenance
of the A-ISOMETER®
• unauthorized structural modifications to the A-ISOMETER®
• failure to comply with the technical data
• improperly executed repairs, and the use of 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
by the manufacturer

10
Everyone who works with this A-ISOMETER®must take note of this operating
manual, and in particular of the safety information.
In addition to this, the rules and regulations concerning accident prevention
which are valid for the operating location must be obeyed.
Personnel
Only appropriately qualified staff may work with the A-ISOMETER®.The term
“qualified“ means that such staff are familiar with the assembly, commissioning
and operation of the product and that they have undergone training which is
appropriate to their activities.
The staff must have read and understood the safety chapter and the warnings
in these operating instructions.
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 damage
to property which may be sustained as a result of faults or errors in these
operating instructions.
Hazards when handling the A-ISOMETER®IRDH375
The IRDH375 A-ISOMETER®is constructed according to the state-of-the-art and
the recognized safety engineering rules. Nevertheless, when it is being used,
hazards may occur to the life and limb of the user or third parties, or there
may be adverse effects on the A-ISOMETER®or on other valuable property. The
A-ISOMETER®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. Impermis-
sible modifications and the use of spare parts and additional devices which are
not sold and recommended by the manufacturer of the devices may cause fires,
electric shocks and injuries.
Unauthorized persons must not have access to or contact with the A-ISOMETER®.
Safety information

11
Warning signs must always be easily legible. Damages or illegible signs must
be replaced immediately.
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 notify the BENDER company immediately.
The devices must only be stored in rooms where they are protected against dust
and moisture, and spraying or dripping water, and where the indicated storage
temperatures are maintained.
Note
Make sure that the operating voltage is correct !
Prior to insulation and voltage tests the A-ISOMETER®must be disconnected
from the power system for the duration of these tests.
In order to check the proper connection of the device, it is recommended to
carry out a functional test.
Make sure that the basic settings meet the requirements of the system.
Children and unauthorized persons must not have access to or contact with the
A-ISOMETER®.
Explanations of symbols and warnings
The following designations and signs are used for hazards and warnings in
BENDER documentation.
This symbol means a possible threat of danger to the life and
health of human beings.
• Failure to comply with these warnings means that death,
serious physical injury or substantial damage to property may
ensue if the relevant precautions are not taken.
Safety information

12
This symbol means a possibly dangerous situation.
• Failure to comply with these warnings means that slight
physical injury or damage to property may ensue if the relevant
precautions are not taken.
This symbol gives important information about the correct handling of the
A-ISOMETER®.
• Failure to comply with this information can result in faults on
the A-ISOMETER®or in its environment.
Where you see this symbol, you will find application tips and other particularly
useful information.
• This information will help you to make optimal use of the
A-ISOMETER®.
Safety information

13
Directions for installation
Only one insulation monitoring device may be used in each interconnec-
ted IT system.
The terminals (E) and KE shall be connected by a separate wire to the
protective conductor (PE). If the device is connected with the terminals L1, L2, or
an external coupling device to a system under operation, the terminals E 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 resistance,
before starting the A-ISOMETER®.
When insulation or voltage tests are to be carried out, the device shall be isolated
from the system for the test period.
The devices are delivered with the following basic settings:
Version -4..
Alarm 1 / Alarm 2= 40 kOhm / 10 kOhm
Operating principle K1/K2= N/O operation
K3= N/C operation (fixed setting)
Memory= off
System leakage capacitance= 150 µF
Make sure that the basic setting of the A-ISOMETER®complies with the require-
ments of the system to be monitored.
Insulation faults in DC circuits which are directly connected to the AC system
are only monitored correctly when rectifiers carry a continuous load current
> 5... 10 mA.
Safety information

14

15
Function
Essential functions of the IRDH375
• A-ISOMETER®for IT AC systems with galvanically connected
rectifiers and for IT DC systems (isolated power)
• Extended voltage range via coupling devices
• Automatic adaptation to the existing system leakage capacitance
• AMPPlus measuring principle (patent pending)
• Two adjustable response ranges 1 kΩ... 10 MΩ
• LC display
• Serial interface
• Connection monitoring
• Automatic self-test
IRDH375B
• Memory with real-time clock to store all alarm messages
with date and time stamp
• RS485 interface (BMS protocol) for data exchange
with other Bender devices (RS485 electrically isolated)
• Internal disconnection of the ISOMETER from the system to be
monitored (using a control signal), e.g. if several Isometers
are interconnected
• Analog output 0(4)...20mA (electrically isolated)
Option “W“:
• Improved shock and vibration resistance
For use:
-in ships
-on rolling stock
-and in seismic environment
B
B
B
B
B
B
B
B

16
Function
Product description
The IRDH375 A-ISOMETER®monitors the insulation resistance of IT systems. It
is 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 (see 2.3). The device automatically adapts itself to the existing system
leakage capacitance.
Suitable coupling devices are available to extend the nominal voltage range.
The IRDH375 A-ISOMETER®is fitted into an enclosure for panel mounting
144x72 mm (BxH).
Function
The IRDH375 A-ISOMETER®is connected between the unearthed system and the
equipotential 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 setting.
A microprocessor-controlled pulsating AC measuring voltage is superimposed
on the system (AMPPlus measuring principle*). The measuring cycle consists of
positive and negative pulses of the same amplitude. The period depends on
the respective leakage capacitances and the insulation resistance of the system
to be monitored.
An insulation fault between system and earth closes the measuring circuit. An
electronic evaluation circuit calculates the insulation resistance which is indicated
on the LC display or the external kOhm measuring instrument.
The response time depends on the system leakage capacitance, the insulation
resistance, and the system related interference disturbances. System leakage
capacitances do not influence the measuring accuracy.

17
Function
If the reading is below the selected response values ALARM1/ALARM2, the
associated alarm relays respond and the alarm LEDs “ALARM1/2“ illuminate 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 jumper), the fault indication will
be stored. Pressing the reset button resets the fault message, provided that the
insulation resistance is at least 25% above the preset response value. The fault
memory can also be set in the ‘ISO SETUP‘ menu, in the sub menu Memory:
on/off.
By pressing the test button, the function of the IRDH375 A-ISOMETER® can be
tested. In this way all essential measuring functions as well as connections to
the system and to earth are checked. Depending on the setting in the menu, this
self-test can automatically be carried out every hour or every 24 hours (factory
setting: every 24 h). The self-test is carried out once after the supply voltage
has been switched on.
The connections M+/M- (current output 0...400 µA) of the A-ISOMETER®
IRDH375 version for external kOhm display are not electrically isolated.
*) AMPPlus measuring principle adaptive “measuring pulse“,
a measuring principle developed by BENDER (patent pending)
Additional functions Option „B“
The analog output 0(4)...20 mA of the A-ISOMETER®IRDH375B version is
electrically isolated.
Real-time clock
The real-time clock serves as a time base for the memory and self test function.
At first the correct time and date must be set in the menu „ISO ADVANCED“.
In the case of a supply voltage failure, time and date will be stored for at
least 3 days. If the 24 h selftest is activated in the ISO ADVANCED menu, 1
h can be set for the execution of the self test by selecting the „TEST: 00:00“
menu. Then a self-test will be started automatically once a day at the given
time. If the 1 h autotest has been selected, the self-test is automatically carried
out every full hour.
B
B
B
B
B
B
B
B
B
B
B

18
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
Interconnected systems
When using ISOMETERs®in IT systems care shall be taken that only one active
ISOMETER®may be connected in each conductive interconnected system. If IT
systems are interconnected via coupling switches, it is essential to ensure that
ISOMETERs not currently used must be disconnected and deactivated via a
control system before starting. 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 ISOMETERs is required.
There are two possibilities to guarantee safe insulation monitoring in intercon-
nected IT systems.
Function input F1/F2
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 connec-
tions L1/L2 are switched off via internal coupling relays, the measuring function
is stopped and the message „STANDBY“ is issued on the display. After opening
the input F1/F2, at first the connection to the IT system will be restored, then a
completely new measuring cycle for insulation monitoring will be started.
This function allows selective disconnection of an IRDH375B via auxiliary
contacts of coupling switches in interconnected IT systems. One coupling switch
each in a line-type or ring-type arrangement can deactivate the next IRDH375B
downstream. This arrangement guarantees that one ISOMETER per each galvani-
cally connected IT system is active.
In a ring-type arrangement with all coupling switches closed it can be assumed
that all ISOMETERs are deactivated. In order to prevent this, a BMS Master
(IRDH375B Ad1) monitors the condition of the function input F1/F2 of all Slave
ISOMETERs. If all Slave ISOMETERs 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.
Function

19
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
Function
ISOnet function (COM SETUP)
Select „ISOnet=ON“ in the menu COM SETUP to activate this function. This
function is a type of scanning function. If the ISO net function of the BMS
Master is activated, it controls the ISOnet Slave devices via BMS (Bender
Measuring Interface). Once the measuring cycle is completed by an ISOMETER,
the ISOnet Master passes the permission for insulation measurement to the next
Slave. During the insulation measurement by one Isometer all other ISOMETERs
remain in the STANDBY mode. That prevents cross interferences between the
ISOMETERs in interconnected systems. In comparison to the function „coupling
switches and function input F1/F2“ the measurement is not carried out conti-
nuously so that the response time is prolonged. In average the response time is
prolonged for about 8 seconds (Ce = 1µF) for each network node. The advantage
is that no auxiliary contacts of a coupling device are necessary. In addition, this
would provide a solution for capacitive or diode-coupled IT systems.

20
Function
Self-test
In order to guarantee high measuring accuracy, the A-ISOMETER®provides
comprehensive self-test functions. After switching on the supply voltage, 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 functions is indicated
on the display by a bar graph. Depending on the system conditions, the duration
of the self-test is 15 ... 20 sec., then the device indicates “Test ok“ for approx. 2
seconds. Then the device returns to the normal measuring mode and the current
measuring value is displayed after the expiry of the reading time.
If a fault is found, !Error!“ is indicated on the LC display, the system fault relay
K3 (31-32-34) drops, the system fault LED illuminates and the respective error
message (see table) is indicated. If there is such an error in the system, a self-test
will be started every 60 seconds. If no more errors can be detected, the error
B
B
B
B
B
B
B
B
B
B
B
B
B
B
An ISOnet Slave checks whether a Master is present in the network. If there is
no Master available, the display issues the fault message „ISOnet Master?“ If the
ISOnet function is activated, the function input F1/F2 will be disconnected.