Bender ISOMETER isoBAT425 User manual

EN
Manual
Insulation monitoring device for
batteries up to DC 500 V
Software version: D0560
ON
TR
MENU
AL1 AL2 k
<k
ISOMETER
isoBAT425
L+ L-
EKEA1A2
14 24 11
T/R AB
ZE420
EEE
L+ L-
E
ISOMETER® isoBAT425 with
coupling impedance ZE420
isoBAT425_D00308_04_M_XXEN/07.2020

Bender GmbH & Co. KG
P.O. Box 1161 • 35301 Gruenberg • Germany
Londorfer Strasse 65 • 35305 Gruenberg • Germany
Tel.: [phone]
Fax: [phone]
E-mail: [email protected]
Web: www.bender.de
© Bender GmbH & Co. KG
All rights reserved.
Reprinting only with permission
of the publisher.
Subject to change!
Customer service
Service hotline: 0700-BenderHelp (Telephone and Fax)
Carl-Benz-Strasse 8 • 35305 Gruenberg • Germany
Tel.:[phone]
Fax:[phone]
E-mail: [email protected]
READ THIS MANUAL AND ALL ACCOMPANYING DOCUMENTS CAREFULLY
AND RETAIN FOR FUTURE REFERENCE.

Table of contents
3
isoBAT425_D00308_04_M_XXEN/07.2020
1. Important information .................................................................... 5
1.1 How to use this manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Technical support: Service and support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.1 First level support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.2 Repair service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.3 Field service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Training courses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4 Delivery conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5 Inspection, transport and storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.6 Warranty and liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.7 Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2. Safety instructions ............................................................................ 7
2.1 General safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Work activities on electrical installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. Function ............................................................................................. 8
3.1 Device features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2.1 ZE420 coupling impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2.2 Measured values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2.3 Monitoring of the insulation resistance and the system leakage
capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2.4 Undervoltage/overvoltage monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2.5 Measuring pulse period duration and operating times . . . . . . . . . . 10
3.2.6 Fault diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.6.1 Insulation fault to earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.6.2 Insulation fault between the battery strings (cross fault) . . . 10
3.2.6.3 Battery voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.7 Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.2.8 Connection monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.2.8.1 E-KE monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.2.8.2 System connection monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.2.9 Reset and test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.2.9.1 External test/reset input and stop mode . . . . . . . . . . . . . . . . . .11
3.2.9.2 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.2.9.3 Manual self test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.2.9.4 Automatic self test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.2.9.5 Self test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.2.9.6 Checking the operating system . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2.10 Stop function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2.11 Start with an alarm (S.AL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2.12 Measuring and response times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2.13 Password protection (on, OFF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.2.14 Factory settings FAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.2.15 Fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.2.16 History memory HiS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.2.17 Interface/protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4. Installation, connection and commissioning ............................15
4.1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.2 Wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Table of contents
4isoBAT425_D00308_04_M_XXEN/07.2020
5. Operation of the device ................................................................. 18
5.1 Display elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2 Menu overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.3 "AL" menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
5.3.1 Response value setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.4 "out" menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.4.1 Configuration of the alarm relay operating mode . . . . . . . . . . . . . . . 20
5.4.2 Alarm relay alarm assignment "r1" and "r2" and LED assignment 20
5.4.3 Fault memory configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.4.4 Interface configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.5 "t" menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.5.1 Time configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.6 "SEt" menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
5.6.1 Function configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.7 Measured value display and history memory . . . . . . . . . . . . . . . . . . . . . . . 21
6. Data access using the BMS protocol ........................................... 22
7. Data access using the Modbus RTU protocol ............................ 23
7.1 Reading out the Modbus register from the ISOMETER®. . . . . . . . . . . . . . 23
7.1.1 Command of the master to the ISOMETER® . . . . . . . . . . . . . . . . . . . . . 23
7.1.2 The ISOMETER® answers the master . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.2 Write Modbus register (parameter setting) . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.2.1 Command of the master to the ISOMETER® . . . . . . . . . . . . . . . . . . . . . 23
7.2.2 The ISOMETER® answers the master . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.3 Exception code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.3.1 Structure of the exception code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8. Modbus register assignment of the ISOMETER® .......................25
8.1 Device-specific data type of the ISOMETER®. . . . . . . . . . . . . . . . . . . . . . . . .27
8.1.1 Device name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
8.1.2 Measured values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
8.1.2.1 Float = Floating point value of the channels . . . . . . . . . . . . . . .27
8.1.2.2 AT&T = Alarm type and test type (internal/external) . . . . . . .27
8.1.2.3 R&U = Range and unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
8.1.3 Alarm assignment of the alarm relays . . . . . . . . . . . . . . . . . . . . . . . . . .28
8.2 Channel descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
9. IsoData data string .........................................................................30
10. Technical data ...............................................................................31
10.1 Tabular presentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
10.2 Standards, approvals and certifications. . . . . . . . . . . . . . . . . . . . . . . . . . . .33
10.3 Ordering details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
INDEX .................................................................................................... 34

isoBAT425_D00308_04_M_XXEN/07.2020 5
Important information
1. Important information
1.1 How to use this manual
Always keep this manual within easy reach for future reference.
To make it easier for you to understand and revisit certain sections of text and instruc-
tions in the manual, we have used symbols to identify important instructions and infor-
mation. The meaning of these symbols is explained below:
DANGER
This signal word indicates that there is a high risk of danger that
will result in electrocution or serious injury if not avoided.
WARNING
This signal word indicates a medium risk of danger that can lead
to death or serious injury if not avoided.
CAUTION
This signal word indicates a low-level risk that can result in minor
or moderate injury or damage to property if not avoided.
This symbol denotes information intended to assist the user in
making optimum use of the product.
This manual is intended for qualified personnel working in
electrical engineering and electronics!
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 regarding specific customer applications
• Commissioning
• Troubleshooting
1.2.2 Repair service
Repair, calibration, update and replacement service for Bender products
• Repair, calibration, testing and analysing Bender products
• Hardware and software update for Bender devices
• Delivery of replacement devices for 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
Telephone: [phone]*
Fax: [phone]
only available in
Germany: 0700BenderHelp (Tel. and Fax)
E-mail: [email protected]
Telephone: [phone]** (technical issues)
[phone]**, -785** (sales)
Fax: [phone]
E-mail: [email protected]

Important informationImportant information
isoBAT425_D00308_04_M_XXEN/07.2020
6
1.2.3 Field service
On-site service for all Bender products
• Commissioning, parameter setting, maintenance, troubleshooting for Bender pro-
ducts
• Analysis of the building installation (power quality test, EMC test, thermography)
• Practical training courses for customers
*Available from 7.00 a.m. to 8.00 p.m. on 365 days of the year (CET/UTC+1)
**Mo-Thu 7.00 a.m. - 8.00 p.m., Fr 7.00 a.m. - 13.00 p.m.
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
The conditions of sale and delivery set out by Bender apply. For software products, the
"Softwareklausel zur Überlassung von Standard- Software als Teil von Lieferungen, Er-
gänzung und Änderung der Allgemeinen Lieferbedingungen für Erzeugnisse und Leis-
tungen 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 Manu-
facturers' Association) also applies. Conditions of sale and delivery can be obtained from
Bender in printed or electronic format.
1.5 Inspection, transport and storage
Inspect the 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
contact Bender immediately. The devices must only be stored in areas where it is pro-
tected from dust, humidity and spray or dripping water, and in which the specified sto-
rage temperatures can be assured.
Telephone: [phone]**, -762** (technical issues)
[phone]** (sales)
Fax: [phone]
E-mail: [email protected]
Internet: www.bender-de.com
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 recommended by the
manufacturer.
This operating manual, especially the safety instructions, must be observed by all person-
nel working on the device. Furthermore, the rules and regulations that apply for accident
prevention at the place of use must be observed.
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 di-
rective on the restriction of certain hazardous substances in electrical and electronic
equipment (RoHS directive) apply in the European Community. In Germany, these po-
licies are implemented through the "Electrical and Electronic Equipment Act" (ElektroG).
According to this, the following applies:
• Electric and electronic equipment are not to be included in household waste.
• Batteries and accumulators are not to be included in household waste but must be
disposed of in accordance with the regulations.
• Waste electrical and electronic equipment (WEEE) from users other than private
households that was introduced to the market after 13th 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 website at
www.bender-de.com -> Service & support.

isoBAT425_D00308_04_M_XXEN/07.2020 7
Safety instructions
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
If the device is being used in a location outside the Federal Republic of Germany, the
applicable local standards and regulations must be complied with. European standard
EN 50110 can be used as a guide.
DANGER
Risk of fatal injury from electric shock!
Touching live parts of the system carries the risk of:
• An electric shock
• Damage to the electrical installation
• Destruction of the device
Before fitting the device and prior to working on the device
connections, make sure that the power supply has been
disconnected. Observe the rules for working on electrical
installations.
2.3 Intended use
This ISOMETER® is intended for monitoring the insulation resistance RFas well as the
voltage of a battery during its assembly from individual battery cells. The ISOMETER® mo-
nitors the insulation resistance RFof batteries with nominal system voltages of
DC 0…400 V. The maximum permissible system leakage capacitance Ceis 1 µF. The resul-
ting measured values allow diagnosing the type and location of the insulation fault.
In order to meet the requirements of applicable standards, customised parameter set-
tings must be made on the equipment in order to adapt it to local equipment and opera-
ting conditions. Please heed the limits of the area of application indicated in the technical
specifications.
Any other use than that described in this manual is regarded as improper.
.
Only skilled persons are permitted to carry out the work necessary to
install, commission and run a device or system.
In case the ISOMETER® issues an alarm message, the insulation
fault should be eliminated as quickly as possible.
The alarm message of the ISOMETER® must be audible and/or
visible even when the device is installed inside a
control cabinet.

isoBAT425_D00308_04_M_XXEN/07.2020
8
Function
3. Function
3.1 Device features
• Monitoring of the insulation resistance RFto earth
• Monitoring of the nominal battery voltage Unbetween terminals "L+" and "L-"
• Measurement of the residual voltages UL+e and UL-e of terminals "L+" and "L-" to
earth
• Determination of the faulty conductor L+/L-, i.e. the distribution of the insulation
resistance RFbetween terminals "L+" and "L-"
• Monitoring and automatic adjustment to the system leakage capacitance Ceup to
4 µF
• Continuous connection monitoring of terminals "L+", "L-" and "E"
• Selectable start-up delay, response delay and delay on release
• Two separately adjustable response value ranges of 10 k …5 M (alarm 1, alarm 2)
• Configurable measuring frequency for adjustment to the physical characteristics of
the battery
• Alarm signalling via LEDs ("AL1", "AL2"), display and alarm relays ("K1", "K2")
• Automatic device self test
• N/C operation or N/O operation selectable
• Measured value indication via multi-functional LCD
• Fault memory can be activated
• Device supply via wide-range power supply
• RS-485 (galvanically isolated) including the following protocols:
• BMS interface (Bender measuring device interface) for data exchange with other
Bender components (bidirectional)
• Modbus RTU (bidirectional)
• IsoData for continuous data output (unidirectional)
• Password protection to prevent unauthorised parameter changes
3.2 Functional description
The isoBAT425 ISOMETER® is intended for monitoring the insulation resistance RFas well
as the voltage of a battery during its assembly from individual battery cells. The ISOME-
TER® measures the insulation resistance RFand the system leakage capacitance Ceof the
battery to earth. In addition, the nominal voltages Unbetween L+ and L-, the residual
voltages UL+e (between UL+ and earth) as well as UL-e (between UL- and earth) are measu-
red.
The first step consists of assembling the battery in two parallel strings (plus and minus
string) which are not interconnected. During the second step, the two strings are con-
nected to form a complete battery by means of another battery.
The resulting measured values allow diagnosing the type and location of the insulation
fault. In the LC display, the faulty conductor is displayed with a plus or a minus sign
preceding the value RF.
It is possible to assign the detected fault or the faulty conductor to an alarm relay via the
menu. If the values RFor Unviolate the activated response values in "AL" menu, the LEDs
and the alarm relays "K1" and "K2" issue an alarm according to the alarm assignment set-
tings in the "out" menu. In addition, the operating mode of the alarm relay (n.c./n.o.) can
be set and the fault memory "M" can be activated in this menu.
If the values RFor Undo not violate their respective release value (response value plus
hysteresis) for the period toff without interruption, the alarm relays will switch back to
their initial position and the alarm LEDs "AL1"/"AL2" will go out. If the fault memory is ac-
tivated, the alarm relays remain in alarm condition and the LEDs light until the reset but-
ton "R" is pressed or the supply voltage Usis interrupted.
The device function can be tested using the test button "T". Parameters are assigned to
the device via the LCD and the control buttons on the front panel; this function can be
password-protected. The parameters of the device can be set via Modbus RTU.
3.2.1 ZE420 coupling impedance
In the case of open battery strings, the ZE420 coupling impedance provides a low-re-
sistance connection (10 k) between terminals "L+" and "L-", necessary for the measuring
functions of the ISOMETER®. In the case of closed batteries, the resistance is optional due
to the internal resistance of the battery.
In addition to this resistance, there is also an optional 1.5 mA current limitation. It starts
above Un= 25 V and increases the internal resistance of the coupling impedance. For this
reason, in the event of a cross fault, the system connection monitoring may be additio-
nally triggered but, at the same time, the responsivity of the cross fault detection is
increased.

FunctionFunction
isoBAT425_D00308_04_M_XXEN/07.2020 9
In addition, the coupling impedance contains two capacitances for a necessary minimum
leakage capacitance to earth.
3.2.2 Measured values
The following parameters are measured by means of the ISOMETER®:
The measured value ranges and the resolution are indicated in the following table:
Parameter Description Unit
RFInsulation resistance to earth k
UnNominal system voltage between L+ and L- VDC
UL+e Residual voltage between L+ and earth VDC
UL-e Residual voltage between L- and earth VDC
Faulty conduc-
tor
Distribution of the insulation resistance RFbetween ter-
minals "L+" and "L-".
In the LC display, the fault location is marked with a plus
or a minus sign preceding the value RF.
%
Value Interface Value range Resolution
R
LCD 1 k 999 k 1 k
1.0 M 10.0 M 0.1 M
BMS 1 k 20000 k 1 k
Modbus, IsoData 1 k 20000 k 1 k
U
LCD 0 V ±99.9 V 0.1 V
±100 V ±500 V 1 V
BMS 0 V 500 V 1 V
Modbus, IsoData 0 V ±500 V 0.1 V
C
LCD 0 nF 999 nF 1 nF
1.00
μ F9.99 μ F0.01 μ F
BMS 0 nF 9990 nF 1 nF
Modbus, IsoData 0 nF 9990 nF 1 nF
3.2.3 Monitoring of the insulation resistance and the system leakage
capacitance
The insulation resistance RFas well as the system leakage capacitance Ceto earth are me-
asured. The results are the total values from the sub-components RF1 || RF2 as well as
Ce1 + Ce2. The system leakage capacitance value Ceis only updated above RF= 10 k.
When the insulation resistance RFreaches or falls below the threshold values R1
(prealarm) or R2 (main alarm), an alarm message is issued. Parameters R1 and R2 can be
found in the response value menu "AL" (see table on page 19). If by means of the measu-
red voltages the faulty conductor can be assigned to the plus or the minus string, only the
corresponding "L+" or "L-" alarm will be issued. Otherwise, both alarms are issued to-
gether.
The system leakage capacitance Ceis monitored on its compliance with the maximum
permissible value for the ISOMETER®. If the measured value of the system leakage
capacitance Ceexceeds 4 µF, the device error "E.07" with the alarm message "Device er-
ror" is issued.
The measurement method requires a low-resistance connection between terminals "L+"
and "L-". If the battery strings are still separated from each other, the connection will be
established via the coupling impedance. The 12 k internal resistance of the coupling im-
pedance is included in the measured value RF. If RFis below 100 k, a measured value de-
viation of approx. +2 k must be expected. If the battery strings are connected to form a
complete battery, the internal resistance of the battery establishes the low-resistance
connection and the deviation due to the coupling impedance is omitted.
3.2.4 Undervoltage/overvoltage monitoring
The nominal system voltage value Unis 400 V. With an overvoltage of 25 %, a maximum
of 500 V are permissible. The nominal system voltage Unis measured in VDC and VRMS. The
root-mean-square value is a true RMS value and is only required for overload detection
(over range) of the system coupling. In addition, the residual voltages UL+e as well as
UL-e to earth are determined. The voltage values on the LC display and the interface are
averaged to improve the resolution and are time-delayed. The comparators of the system
voltage monitoring use the non-delayed, non-averaged system voltage. Therefore, minor
deviations between the response of the voltage monitoring and the indicated voltage
value are possible.
The parameters (U1 <, U1 >, U2 < and U2 >) for monitoring the nominal system voltage
Uncan be set in the response value menu "AL" (seepage 19). The maximum undervoltage
value is limited by the overvoltage value. If the nominal system voltage Unreaches, falls
below or exceeds the limit values (U < or U >), an alarm will be signalled. The alarm will
be deleted when the threshold values plus hysteresis (see page 19) are no longer vio-
lated.

FunctionFunction
isoBAT425_D00308_04_M_XXEN/07.2020
10
The image below shows the operating mode of the voltage comparators with the resul-
ting messages.
3.2.5 Measuring pulse period duration and operating times
In the "sEt" menu, the measuring pulse period duration TMP can be configured with the
parameter "t ". The maximum operating times tae (see page 13) of the monitoring of
RFand RCdepend on it. The modifiable measuring pulse period duration allows adjusting
the ISOMETER® to the insulation behaviour of the battery.
Measuring pulse period durations which are marked with the "auto" symbol switch au-
tomatically to the longest measuring pulse period duration as long as the message "Bat-
tery voltage Unis ok" is indicated. The following table shows the maximum operating
times tae for the different alarms and measuring pulse period durations TMP.
* The value only applies to Ce1 oder Ce2 > 400 nF. Below this value, the absence of just one system connection is not detected.
** The value only applies to Rf≤ 1,5 M. Above this value, the absence of just one system connection is not reliably
detected.
TMP RFRCE.01 E.02
0.8 s 3.5 s 3.0 s 2.1 s 6.0 s
2.0 s 8.0 s 3.0 s 2.1 s 6.0 s
4.0 s 16 s 3.0 s 2.1 s 15 s**
8.0 s 32 s 3.0 s 2.1 s 30 s*
OverRange
Voltage fault
Hys
Battery
voltage ok
Voltage fault
Hys
Crossfault
Branch open
Hys
Connection
fault
Limit
510 V
U
BatH
U
BatL
U
CrossH
U
CrossL
0 V
-10 V
Comparator
U
nRMS
>510VSTAT_U_0V
U
nDC
>
U
BatH
STAT_BAT_H
U
nDC
>
U
BatL
STAT_BAT_L
U
nDC
>
U
CrossH
STAT_CROSS_H
U
nDC
>
U
CrossL
STAT_CROSS_L
U
nDC
<-10VE.02
Status Message
STAT_U_0V
STAT_BAT_H
&STAT_BAT_L
!STAT_BAT_H
&STAT_CROSS_H
!STAT_BAT_L
&STAT_CROSS_L
!STAT_CROSS_H
!STAT_CROSS_L
Overvoltage
Undervoltage
Batteryvoltage
ok
Overvoltage
Undervoltage
Hys
Overvoltage
Undervoltage
Overvoltage
Undervoltage
3.2.6 Fault diagnosis
3.2.6.1 Insulation fault to earth
The displayed value RFof the ISOMETER® is the total insulation resistance RFto earth. The
polarity and the amount of residual voltages UL+e and UL-e are an indicator of insulation
fault location.
If the battery strings are not interconnected yet, the residual voltages UL+e and UL-e are
almost identical and the nominal battery voltage Unis about 0 V, it is very likely that the
insulation fault is only located in one string. The polarity of the residual voltages marks
the affected string. The affected battery cell can be calculated by means of the residual
voltages UL+e or UL-e.
If there is an additional insulation fault in the other string, determining the cell is almost
impossible, since several variables, depending on location and size of the insulation fault,
determine the residual voltages. If the battery strings are connected to form a complete
battery, the measured value "Fault location%" indicates the fault location. Clear as-
signment is only possible in the event of a single insulation fault. The value can range bet-
ween -100 % and +100 %. The sign indicates the string affected. When the fault is located
in the middle of the battery, the fault location is 0 %.
3.2.6.2 Insulation fault between the battery strings (cross fault)
The insulation fault RC(cross fault) creates a connection between the unconnected
strings and has no connection to earth. It can be detected via the Unvalue of the voltage
measurement. If Unreaches or exceeds the comparator value UCrossL, the overvoltage
alarm is activated.
Depending on the fault location of the insulation fault RC, an unloaded voltage on the
same level as the voltage in a battery cell up to the maximum voltage of the series con-
nection of both battery strings can occur. RCdirectly at the coupling points is not de-
tectable due to the absence of voltage. Since the coupling impedance contains a current-
limited resistance of 10 k, which is connected in parallel to the series internal resistance
of 240 k of the ISOMETER®, the nominal system voltage Unresulting from the insulation
fault RCis loaded with this resistance. For RC> 10k, exceeding half the voltage of a bat-
tery cell can be considered as lower limit for the fault detection. It has to be observed that
the internal resistance of the coupling impedance is only linear up to approx. 1.5 mA and
from there, limits the current to this value. In connection with the non-linear internal re-
sistance of the coupling impedance, in case of high-resistance values of RCthe device er-
ror/coupling error "E.02" can occur simultaneously with the overvoltage alarm.
Ucell = ULxe x (1 + RF/ Ri) with ISOMETER® internal resistance Ri= 120 k

FunctionFunction
isoBAT425_D00308_04_M_XXEN/07.2020 11
3.2.6.3 Battery voltage
The nominal system voltage Unis monitored with the voltage comparators described
above. The insulation fault RCbetween the unconnected strings as well as the completion
of the battery can be detected via these comparators.
3.2.7 Error codes
If, contrary to expectations, a device error should occur, error codes will appear on the
display. Some of these are described below:
Internal device errors E.xx can be caused by external disturbances or internal hardware
errors. If the error message occurs again after restarting the device or after a reset to
factory settings (menu item "FAC") , the device must be repaired.
After eliminating the fault, the alarm relays switch back automatically or by pressing the
reset button.
Error code Meaning
E.01
PE connection error
The connections "E" or "KE" to earth are interrupted.
Action:
Check connection, eliminate error. The error code will be erased
automatically once the error has been eliminated.
E.02
System connection fault
The internal resistance of the system is too high, the connection "L+"
or "L-" to the system is interrupted or the DC system to be monitored
has the wrong polarity at Un< -10 V.
Action:
Check connection, eliminate error. The error code will be erased
automatically once the error has been eliminated.
E.05 Measurement technique error
Calibration invalid for current software version
E.07 The permissible system leakage capacitance has been exceeded.
System leakage capacitance Ce> 4 µF
E.08
Calibration error during the device test
Action:
If the error continues to exist after checking the device connections,
there is an error inside the device.
The self test can take a few minutes. It can be suppressed for the duration of the device
start by setting the parameter "S.Ct = off" in the "SEt" menu. This allows the ISOMETER® to
enter measurement mode quickly after connecting the supply voltage Us.
3.2.8 Connection monitoring
3.2.8.1 E-KE monitoring
The E-KE monitoring checks the connection between terminals "E"and "KE"and thereby
ensures the connection to earth of the ISOMETER® and the battery enclosure. An error is
reported with the code E.01 and device error. It operates constantly in the background
and does not affect the measuring function of the device.
3.2.8.2 System connection monitoring
The system connection monitoring monitors the connection of terminals "L+"and "L-"to
the battery by means of the coupling impedance. An error is reported with the code E.02
and device error. The monitoring requires a resistance smaller than 12 k and a system
leakage capacitance Celarger than 80 nF between terminals "L+"and "L-". In the case of
separated battery strings, the coupling impedance ensures that these minimum requi-
rements are fulfilled. In the case of closed battery strings, the battery provides the requi-
red connection between "L+"and "L-"with its low-ohmic internal resistance. The system
connection monitoring operates constantly in the background and does not influence
the measuring function of the ISOMETER®.
Above a measuring pulse period duration of 2.0 s, a missing connection to "L+" or "L-" is
only reliably detected under the conditions specified in chapter 3.2.5.
The system connection monitoring can be deactivated by means of the "nEt" parameter
in the "SEt" menu.
3.2.9 Reset and test
3.2.9.1 External test/reset input and stop mode
The fault memory ("M") is deleted by briefly connecting (0.2 s < t < 1.5 s) the terminal
"T/R"to earth (terminal "E"). If the connection time exceeds 1.5 s, the manual self test
starts. If the terminal "T/R"is still connected to earth after the device self test has been
completed, the ISOMETER® changes to stop mode ("StP" indication on the display) and
the measuring function is deactivated.

FunctionFunction
isoBAT425_D00308_04_M_XXEN/07.2020
12
3.2.9.2 Reset
Briefly pressing (0.2 s < t < 1.5 s) the external T/R button, pressing and holding (t > 1.5 s)
the "R" button, a reset command received via the interface (ALMCL to BMS) or the stop
mode trigger a reset in the ISOMETER®. In doing so, alarms that are no longer active are
deleted from the fault memory. Alarms that are pending in the hysteresis are not deleted.
If the external T/R button is pressed and held (t > 1.5 s), the ISOMETER® performs a reset
followed by a test.
3.2.9.3 Manual self test
During a manual test (duration approx. 30 s), the measuring functions of the ISOMETER®
are deactivated. Pressing and holding (t > 1.5 s) the "T" button or the external T/R button
as well as a test command received via the interface (COM) initiates a manually started
test. During the test function, the "AL1"and "AL2"LEDs are lit, the message "tES" appears
on the display and all self-test functions described in the self-test section are carried out.
An alarm which makes the LEDs flash overrides the lighting of the LEDs. The measured
values that can trigger an alarm are issued on the COM interface with a pseudo value and
an alarm, and the requests of numbers respond "n=/TI x" for T or T/R and "n=/TE x" for
COM.
If the external T/R button is the trigger, a reset is carried out before the test, since the first
function of the button is the reset, so that alarms which are no longer active (which are
no longer in the hysteresis) are deleted from the fault memory. The LCD indicates the
messages "tES" and "CAL".
If the "T" button is the trigger, as long as this button is pressed, all segments in the LCD
are indicated and afterwards only the message "tES" flashes. Unlike triggering via the ex-
ternal T/R button, a reset is only carried out after completing the test function.
If an interface command (TESTI on BMS) is the trigger, the LCD indicates the texts "tES"
and "CAL". A reset is only carried out after completing the test function.
Except triggering via the T/R button, the alarm relays retain the alarms active at the
beginning of the text (except the "Device fault" alarm) during the test. In addition, the
message "test" is issued on the alarm relays if it has been configured in the "out" menu
and in the alarm assignment of the respective alarm relay. After completing the manually
started test function, which can only be exited when exiting the stop mode, the message
"test", which may be displayed, will also be deleted from the fault memory.
3.2.9.4 Automatic self test
During an automatic test (duration approx. 30 s), the measuring functions of the ISOME-
TER® are deactivated. In the “"t" menu” on page 21, the parameter "test" can be used to
set the repetition time for an automatic test. If this timer is the trigger, only the message
"tES" will be indicated on the display. No alarm is issued via the LEDs, the alarm relays or
the interface. No reset is carried out. A manually started test sets the timer for the au-
tomatic test back to its initial position.
3.2.9.5 Self test
The ISOMETER® has the following self test functions:
Some of the self-test functions are executed constantly or time-controlled in the
background, others are only executed on request.
The following sources can make a self-test request:
• "T" button on the ISOMETER®
• External T/R button
• Serial interface
• Timer for automatic self test, configurable with the "test" parameter in the "t" menu
• Device start when "S.Ct" parameter = on (in the "SEt" menu)
During a self test started by one of the sources named above, the measuring function is
temporarily deactivated. The background tests do not influence the measuring function.
• Checking the operating system : Background test
• Checking the connection of terminals "E"
and "KE"to earth : Background test, constantly
• System connection monitoring : Background test, constantly
• Checking the measurement technique
function

FunctionFunction
isoBAT425_D00308_04_M_XXEN/07.2020 13
3.2.9.6 Checking the operating system
The following elements are part of the operating system check:
• Check sum verification of the program memory
• Error-free program sequence with stack check
• Parameter values check
• µC initialisation check
The µC initialisation check is run at least every 5 min. The data RAM memory, the check
sum of the program memory and the content of the parameter memory are checked at
least once an hour. These tests run in the background and do not influence the measu-
ring function of the ISOMETER®.
3.2.10 Stop function
The stop function stops the measuring functions of the ISOMETER®. The measuring pulse
voltage is 0 V and the input resistance of the system coupling has a high resistance. The
LCD displays the message "StP" and the BMS interface responds "n=/TI x" to the request
of numbers. The message "test" is set and all other messages are deleted.
The stop mode can be started by permanently closing the external T/R button or via the
interface and ends when opening the T/R button or by releasing it via the interface. The
control of the stop mode via the T/R button and the interface is an OR operation. When
the stop mode ends, a waiting time (2 s) starts so that the measured value recording sett-
les before new threshold value comparisons are allowed. If the ISOMETER® has to start
with an alarm ("out" menu, alarm assignment "S.AL" set to "on") the released alarms are
set and the measured resistance values are reset to their initial value. The alarm as-
signment S.AL (i.e. Start with an alarm) should be set identically for both alarm re-
lays. When operating without "S.AL", no alarms are set and the ISOMETER® starts with the
maximum measured resistance value.
3.2.11 Start with an alarm (S.AL)
The S.AL function allows a device start with set alarm messages. This function is activated
in the "out" menu, in the alarm relay alarm assignments "r1" and "r2" by means of the
parameter "S.AL". For useful operation with this function, both "S.AL" alarm relays should
be activated and operate in the "n.c." operating mode.
If "S.AL" is activated during device start, all alarms of the released threshold value
comparisons are set and the measured resistance values are initialised with 0 . The alar-
ms of the individual threshold value comparisons remain set until the respective measu-
red value has reached the "go" status.
No hysteresis is taken into account and the alarms do not remain stored in the fault
memory.
A measured value that reaches the go status after the device has started triggers the
history memory in case of a previous threshold value violation and the alarm remains sto-
red in the fault memory.
3.2.12 Measuring and response times
The measuring time is the period essential for the detection of the measuring value. The
measuring time is reflected in the operating time tae . For the insulation resistance mea-
sured value, it is mainly determined by the necessary measuring pulse duration, which
depends on the insulation resistance RFand the system leakage capacitance Ceof the sys-
tem to be monitored. The measuring pulse is generated by the measuring pulse genera-
tor integrated in the ISOMETER®. The measuring times for Ce, UL1e, UL2e and R % are
synchronous. System disturbances may lead to extended measuring times. In contrast,
the time for the system voltage measurement Unis independent and considerably shor-
ter.
Operating time tae
The operating time tae is the time required by the ISOMETER® to determine the measuring
value. The insulation resistance measuring value depends on the insulation resistance RF
and the system leakage capacitance Ce.
Response delay ton
The response delay ton can be set uniformly for all messages in the "t" menu using the
parameter "ton", whereby each alarm message specified in the alarm assignment has its
own timer for ton. This delay time can be used for interference suppression in the case of
short measuring times.
An alarm will only be signalled when a threshold value of the respective measuring value
is violated for the period of ton without interruption. Every time the threshold value is vi-
olated within the time ton, the response delay "ton" restarts once again.
Total response time tan
The total response time tan is the sum of the operating time tae and the response delay
time ton.

FunctionFunction
isoBAT425_D00308_04_M_XXEN/07.2020
14
Delay on release toff
The delay on release toff can be set uniformly for all messages in the "t" menu using the
parameter "toff", whereby each alarm message specified in the alarm assignment has its
own timer for toff. An alarm will continuously be signalled until the threshold value of the
respective measured value is not violated (including hysteresis) for the period of toff wit-
hout interruption. Each time the threshold value is not violated for the period of toff, the
delay on release "toff" restarts once again.
Start-up delay t
After connection to the supply voltage USthe alarm indication for the preset time
(0…10 s) in the parameter "t" is suppressed.
3.2.13 Password protection (on, OFF)
If password protection has been activated (on), settings can only be made subject to the
correct password being entered (0...999).
3.2.14 Factory settings FAC
Activating the factory setting will reset all modified settings, with the exception of the in-
terface parameters, to the default upon delivery.
3.2.15 Fault memory
The fault memory can be activated or deactivated using the parameter "M" in the "out"
menu. When the fault memory is activated, all pending alarm messages of the LEDs and
alarm relays remain available until they are deleted by using the reset button (internal/
external) or the supply voltage Usis turned off.
3.2.16 History memory HiS
The measured value indications possible at the time of an alarm according to the config
table are stored in the empty history memory. Saving again is only possible after clearing
the history memory via the menu. During the start-alarm phase and due to the message
"TEST", no information is written to the history memory.
3.2.17 Interface/protocols
The ISOMETER® uses the serial hardware interface RS-485 with the following protocols:
• BMS
The BMS protocol is an essential component of the Bender measuring device interface
(BMS bus protocol). ASCII characters are used for the data transfer.
• Modbus RTU
Modbus RTU is an application layer messaging protocol and it provides Master/Slave
communication between devices that are connected altogether via bus systems and net-
works. Modbus RTU messages have a 16-bit-CRC (Cyclic-Redundant Checksum), which
guarantees the reliability.
• IsoData
The ISOMETER® continuously sends an ASCII data string with a cycle of approximately
1 s. A communication with the ISOMETER® within this mode is not possible and no addi-
tional transmitter may be connected via the RS-485 bus cable. The ASCII data string for
the ISOMETER® is described on page 30.
The parameter address, baud rate and parity for the interface protocols are configured in
the "out" menu.
With "Adr = 0", the menu entries baud rate and parity are not shown in
the menu and the IsoData protocol is activated. With a valid bus address
(i.e. not equal to 0), the menu item "baud rate" is displayed in the menu.
The parameter value "---" for the baud rate indicates the activated BMS
protocol. In this event, the baud rate for the BMS protocol is set to 9,600
baud. If the baud rate is set unequal to "---", the Modbus protocol with
configurable baud rate is activated.

isoBAT425_D00308_04_M_XXEN/07.2020 15
Installation, connection and commissioning
4. Installation, connection and commissioning
4.1 Installation
• DIN rail mounting:
Snap the rear mounting clip of the device into place in such a way that a safe and
tight fit is ensured.
• Screw mounting:
Use a tool to position the rear mounting clips so that they project beyond the enclo-
sure (a second mounting clip is required, see ordering information). Fix the device
with two M4 screws, see the following sketch.
Only skilled persons are permitted to carry out the work necessary to
install, commission and run a device or system.
DANGER
Risk of fatal injury from electric shock!
Touching live parts of the system carries the risk of:
• An electric shock
• Damage to the electrical installation
• Destruction of the device
Before fitting the device and prior to working on the device
connections, make sure that the power supply has been
disconnected. Observe the rules for working on electrical
installations.
If the ISOMETER® is used in rail vehicles, it must be ensured that the
ISOMETER® is installed within a control cabinet that complies with
the fire protection requirements of DIN EN 45545-2.
The dimension diagram, sketch for screw mounting and DIN rail mounting:
All dimensions in mm
The front plate cover can be opened at the lower part marked with an arrow.
93
45
67.5
36
31.1
47.5
74.5
2
2
1.
2.
3. Click!
&
2 x
1 x
100 107
Click
M4
M4
!

Installation, connection and commissioning
isoBAT425_D00308_04_M_XXEN/07.2020
16
4.2 Wiring diagram
For details about the conductor cross sections required for wiring, refer to the technical data from page 31.
L+
KE A1 A2
Test / Reset
14 24 11
K1 K2
T/R
L
L1
PE
N
ON
TR
MENU
AL1 AL2 k
<k
ISOMETER
isoBAT425
L+ L-
EKEA1A2
14 24 11
T/R AB
COM465IP
RS-485
AB
R
Ron
off
E
U
L+e
U
L-e
. . .
++
+
Bat 2
. . . .
+
. . . .
+
+
R
c
R
F1
C
e1
+
+
+
+
R
F2
C
e2
Bat 1
U
n
L+
R
F1
R
F2
R
F
=
C
e
= C
e1
+ C
e2
Insulation fault to earth
System leakage capacitance to earth
R
c
Insulation fault between the
plus and minus strings (cross fault)
6A6A
J-Y (St)Y 2x0,6
EEEE
ZE420
EEE
L+
L-
E
L-

Installation, connection and commissioningInstallation, connection and commissioning
isoBAT425_D00308_04_M_XXEN/07.2020 17
Wiring diagram legend:
Terminal Connections
A1, A2 Connection to the supply voltage via fuse (line protection).
If being supplied from an IT system, both lines have to be protected by a fuse*
E
KE
Connect to PE: The same wire cross section as for "A1", "A2" is to be used
Connection to the battery enclosure
L+, L– Connection to the battery to be monitored
T/R Connection for the external combined test and reset button
11, 14 Connection to alarm relay "K1"
11, 24 Connection to alarm relay "K2"
A, B RS-485 communication interface with connectable terminating resistor
Example: Connection of a BMS Ethernet gateway COM465IP
* For UL applications:
Only use 60/75°C copper lines!
For UL and CSA applications, the supply voltage Usmust be
protected via 5-A fuses.
Connect the device as illustrated in the wiring diagram.
4.3 Commissioning
1. Check that the ISOMETER® is properly connected to the system to be monitored.
2. Connect the supply voltage Usto the ISOMETER®.
The device carries out a calibration, a self test and adjusts itself to the IT system to be
monitored. When high system leakage capacitances are involved, this procedure
may take up to 30 s. The standard display then appears showing the present insula-
tion resistance RF, e.g.:
The pulse symbol signals an error-free update of the resistance measured value. If
the measuring value cannot be updated due to disturbances, the pulse symbol will
be blanked.
3. Start a manual self test by pressing the test button "T". Whilst the test button is
pressed and held down, all display elements available for this device are shown.
During the test, the "tES" symbol flashes. Any internal malfunctions detected are
shown on the display as error codes (see page 11). The alarm relays are not checked
during the test (factory setting). The setting can be changed in the "out" menu, so
that the alarm relays switch to the alarm state during the manual self test.
4. Check factory setting for suitability.
Are the settings suitable for the installation to be monitored?
The list of factory settings are shown in the tables from page 19.
5. Check the function using a genuine insulation fault.
Check the ISOMETER® in the system being monitored against earth, e.g. via a
suitable resistance.

isoBAT425_D00308_04_M_XXEN/07.2020
18
Operation of the device
5. Operation of the device
The menu structure is illustrated schematically on the following pages.
After pressing the "MENU" button for > 1.5 s, the first menu item "AL" appears. Use
and (Enter) buttons for navigation and settings.
Up and down button:
- to navigate up or down in the menu settings
- increasing or decreasing values
MENU
Pressing the MENU/Enter button for more than 1.5 s:
- Starts menu mode
or
- or when the device already is in menu mode:
Exit menu item (Esc). Any recent
changes will not be stored.
Pressing the MENU/Enter button for less than 1.5 s:
- Confirms menu selection
or
- confirms modified value
The areas of the display that can be configured flash!
5.1 Display elements
Device front/display Function
ON
AL1
AL2
green - on
yellow - alarm
yellow - alarm
TTest button ( press > 1.5 s)
By pressing and holding the test button, the display
elements are indicated
Up button
R
Down button
Reset button (press > 1.5 s)
MENU
ENTER
MENU button (press > 1.5 s)
1
U: Nominal system voltage Un
R: Insulation resistance RF
C: System leakage capacitance Ce
2
Monitored conductor
e.g.
Display indication Measured parameter
U L1L2 Un
U L1 UL+e
U L2 UL-e
3
= : Voltage type DC
~: Voltage type AC
4Measured values and units
5Password protection is activated
6In the menu mode, the operating mode of the res-
pective alarm relay is displayed
7Communication interface
With measured value: isoData operation
8The fault memory is activated
9Condition symbols
10 Identification for response values and response value
violation
ON AL1 AL2
TRMENU
+
test onoff MAdr
L1L2 C
<
>
s
kM %
Fµ
{
{
{
{
12 3
4
567
8
{
9
{
10
: Error-free measured value update
Assignment according to
table on page 20

Operation of the deviceOperation of the device
isoBAT425_D00308_04_M_XXEN/07.2020 19
5.2 Menu overview
Menu item Parameter
AL Querying and set response values
out Configuring fault memory, alarm relays and interface
tSetting delay times and self test cycles
SEt Setting device control parameters
InF Querying software version
HiS Querying and clearing the history memory
ESC Going to the next higher menu level
Enter
or
t > 5 min.
k
R
Standard display
R [kΩ]
C [
μF]
U L1 L2 [V ]
UL1 [V
]
UL2 [V
]
R [%]
Measurement display
Menu
Esc
Menu selection
AL
out
t
SEt
InF
HiS
ESC
Enter
Esc
P1
. . .
Pn
ESC
Optional Password
Edit parameters
Save parameters
Enter
Enter
Enter
Esc
Function Button Application
Enter
Menu
Esc
Test
Reset
Select, acknowledge input
Call menu
Exit menu item
Start device test
Clear fault memory
/ MENU Kurz
> 1,5 s
> 1,5 s
> 1,5 s
> 1,5 s
/ MENU
/ MENU
/ T
/ R
Parameter selection
5.3 "AL" menu
5.3.1 Response value setting
The two parameters that monitor the insulation resistance RF, "R1" and "R2", can be found
in the response value menu "AL". The value R1 can only be set higher than the value R2.
If the insulation resistance RFreaches or falls below the activated values R1 or R2, this
leads to an alarm message. If RFexceeds the values R1 or R2 plus the hysteresis (see table
below), the alarm will be cleared.
The parameters ("U <" and "U >") for monitoring the mains voltage can also be activated
or deactivated in the "AL" response value menu. The maximum undervoltage value is
limited by the overvoltage value.
FAC = Factory setting; Cs = Customer settings
Display Activation Setting value Description
FAC Cs Value range FAC Cs
R1 < R2 … 5000 1500 k Pre-alarm value Ran1
Hys. = 25 %/min. 1k
R2 < 10… R1 1000 k Alarm value Ran2
Hys. = 25 %/min. 1k
U1 < U1> … 500 400 V Battery volt. ok UBattH
Hys. = 5 %/min. 2 V
U1 > 3 … U1< 378 V Battery volt. ok UBattL
Hys. = 5 %/min. 2 V
U2 < U2> … 500 345 V CrossFault UCrossH
Hys. = 5 %/min. 2 V
U2 > 3 … U2< 6V CrossFault UCrossL
Hys. = 5 %/min. 2 V

Operation of the deviceOperation of the device
isoBAT425_D00308_04_M_XXEN/07.2020
20
5.4 "out" menu
5.4.1 Configuration of the alarm relay operating mode
FAC = Factory setting; Cs = Customer settings
5.4.2 Alarm relay alarm assignment "r1" and "r2" and LED assignment
In the alarm assignment, each alarm is assigned to the corresponding alarm relay with the
setting "on". The LED indication is directly assigned to the alarms and is not related to the
alarm relays.
In the event of an asymmetrical insulation fault, only the alarm corresponding to the as-
signed conductor (L+ or L-) will be displayed. .
Alarm relay K1 Alarm relay K2 Description
Display FAC Cs Display FAC Cs
n.c. n.c. Operating mode of the alarm relay
n.c./n.o.
K1 "r1" K2 "r2" LEDs Alarm
description
Display FAC Cs Display FAC Cs ON AL1 AL2
off on    Device error E.xx
r1
+R1 <  off r2 +R1 <  on Pre-alarm R1
Fault RF at L+
r1
-R1 <  off r2 -R1 <  on 
Pre-alarm R1
Fault RF at L-
r1
+R2 <  off r2 +R2 <  on Alarm R2
Fault RF at L+
r1
-R2 <  off r2 -R2 <  on Alarm R2
Fault RF at L-
r1
U < V off r2 U < V off 
Alarm Un
undervoltage
r1
U > V off r2
U > V on   
Alarm Un
Overvoltage
r1
UVon r2 UVoff   
Message
battery voltage Un
is ok
r1
test off r2 test off   
Manually
started
device test
1
2
1
Err
2
Err
FAC = Factory setting; Cs = Customer settings
: LED off : LED flashes : LED on
5.4.3 Fault memory configuration
FAC = Factory setting; Cs = Customer settings
5.4.4 Interface configuration
FAC = Factory setting; Cs = Customer settings;
( ) = User setting that is not modified by FAC.
r1
S.AL off r2 S.AL off    Device start with alarm
Display FAC Cs Description
Moff Memory function for alarm messages (fault memory)
Display Setting value Description
Value range FAC Cs
Adr 0 / 3 … 90 3( ) BusAdr.
Adr = 0 deactivates BMS and activates
the isoData data logger with conti-
nuous data output (115k2, 8E1)
Adr 1 --- /
1.2k … 115k “---“ ( ) Baud rate
“---“ --> BMS bus (9k6, 7E1)
"1.2k" … "115k" --> Modbus (variable,
variable)
Adr 2
8E1
8o1
8n1
8n2
8E1 ( )
Modbus
8E1 - 8 data bits
even parity, 1 stop bit
8o1 - 8 data bits
odd parity, 1 stop bit
8n1 - 8 data bits
no parity, 1 stop bit
8n2 - 8 data bits
no parity, 2 stop bit
K1 "r1" K2 "r2" LEDs Alarm
description
Display FAC Cs Display FAC Cs ON AL1 AL2