Bender ISOMETER isoGEN523-S4-4 User manual

Manual
EN
ISOMETER® isoGEN523-S4-4
Insulation monitoring device for
unearthed AC, AC/DC and DC systems (IT systems)
up to 3(N)AC, AC 400 V, DC 400 V
Suitable for use in applications using generators
according to DIN VDE 0100-551
Software version: D0494 V1.xx
isoGEN523_D00320_04_M_XXEN/06.2018

Bender GmbH & Co. KG
P.O. Box 1161 • 35301 Gruenberg • Germany
Londorfer Str. 65 • 35305 Gruenberg • Germany
Tel.: [phone] • Fax: [phone]
E-mail: [e-mail] • www.bender.de
©Bender GmbH & Co. KG
All rights reserved.
Reprinting only with permission of the publisher.
Subject to change!
Photos: Bender archive

3
Table of contents
isoGEN523_D00320_04_M_XXEN/06.2018
1. Important information ........................................................................... 6
1.1 How to use this manual ................................................................................... 6
1.2 Technical support: service and support .................................................... 7
1.2.1 First level support .............................................................................................. 7
1.2.2 Repair service ...................................................................................................... 7
1.2.3 Field service ......................................................................................................... 8
1.3 Training courses ................................................................................................. 8
1.4 Delivery conditions ........................................................................................... 8
1.5 Inspection, transport and storage ............................................................... 8
1.6 Warranty and liability ....................................................................................... 9
1.7 Disposal ................................................................................................................. 9
2. Safety instructions ............................................................................... 10
2.1 General safety instructions .......................................................................... 10
2.2 Work activities on electrical installations ................................................ 10
2.3 Intended use ..................................................................................................... 11
3. Device description ............................................................................... 12
3.1 Device features ................................................................................................. 12
3.2 Functional description ................................................................................... 12
3.2.1 GEn mode ........................................................................................................... 12
3.2.2 dc mode .............................................................................................................. 12
3.2.3 General measuring functions ...................................................................... 13
3.2.4 Isolation from the system to be monitored ........................................... 13
3.2.5 Monitoring the insulation resistance ....................................................... 14
3.2.6 Undervoltage/overvoltage monitoring .................................................. 14
3.2.7 Self test/Device fault ...................................................................................... 14
3.2.8 Malfunction ....................................................................................................... 15
3.2.9 Signalling assignment of the alarm relays K1/K2 ................................ 15

Table of contents
4isoGEN523_D00320_04_M_XXEN/06.2018
3.2.10 Measuring and response times .................................................................. 15
3.2.11 Factory settings FAC ....................................................................................... 16
3.2.12 External, combined test or reset button T/R ......................................... 16
3.2.13 Fault memory .................................................................................................... 16
3.2.14 Interface/protocols ........................................................................................ 17
4. Installation and connection ................................................................ 19
4.1 Installation ......................................................................................................... 20
4.2 Connection of the device ............................................................................. 20
4.3 Commissioning ................................................................................................ 22
5. Parameter overview ............................................................................. 23
5.1 Response value setting ................................................................................. 23
5.2 Configuration of the relay operating mode ........................................... 23
5.2.1 Relay signalling assignment "r1" and "r2" ............................................... 24
5.2.2 Fault memory configuration ...................................................................... 24
5.3 Interface configuration ................................................................................. 25
5.4 Time configuration ......................................................................................... 25
5.5 Function configuration ................................................................................. 26
5.6 Measured value description ........................................................................ 26
6. Data access using the BMS protocol ................................................. 27
7. Data access using the Modbus RTU protocol .................................. 28
7.1 Reading out the Modbus register from the ISOMETER® .................... 28
7.1.1 Command of the master to the ISOMETER® .......................................... 28
7.1.2 The ISOMETER® answers the master ......................................................... 28
7.2 Writing the Modbus register (parameter setting) ............................... 28
7.2.1 Command of the master to the ISOMETER® .......................................... 29
7.2.2 The ISOMETER® answers the master ......................................................... 29
7.3 Exception code ................................................................................................. 29
7.3.1 Structure of the exception code ................................................................ 30

Table of contents
5
isoGEN523_D00320_04_M_XXEN/06.2018
8. Modbus register assignment of the ISOMETER® ............................ 31
8.1 Device-specific data type of the ISOMETER® ......................................... 34
8.1.1 Device name ...................................................................................................... 34
8.1.2 Measured values .............................................................................................. 34
8.1.2.1 Float = Floating point value of the channels ....................................... 35
8.1.2.2 AT&T = Alarm type and test type (internal/external) ........................ 35
8.1.2.3 R&U = Range and unit .................................................................................. 36
8.1.3 Alarm assignment of the relays .................................................................. 37
8.2 Channel description ....................................................................................... 38
9. IsoData data string ............................................................................... 40
10. Technical data .................................................................................... 41
10.1 Tabular representation .................................................................................. 41
10.2 Standards and certifications ........................................................................ 44
10.3 Ordering details ............................................................................................... 44

6isoGEN523_D00320_04_M_XXEN/06.2018
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 in this manual, we
have used symbols to identify important instructions and information.
The meaning of these symbols is explained below:
This manual is intended for qualified personnel working in electrical
engineering and electronics!
DANGER
This signal word indicates that there is a high risk of danger, that will
result in death 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.

Important information
7
isoGEN523_D00320_04_M_XXEN/06.2018
1.2 Technical support: service and support
For commissioning and troubleshooting Bender offers you:
1.2.1 First level support
Technical support by phone or e-mail for all Bender products
 Questions concerning specific customer applications
 Commissioning
 Troubleshooting
Telephone: [phone]*
Fax: [phone]
In Germany only: 0700BenderHelp (Tel. and Fax)
E-mail: [email protected]
1.2.2 Repair service
Repair, calibration, update and replacement service for Bender products
 Repairing, calibrating, testing and analysing Bender products
 Hardware and software update for Bender devices
 Delivery of replacement devices in the event of faulty or incorrectly delivered
Bender devices
 Extended guarantee for Bender devices, which includes an in-house repair service
or replacement devices at no extra cost
Telephone: [phone]** (technical issues)
[phone]**, -785** (sales)
Fax: [phone]
E-mail: [email protected]
Please send the devices for repair to the following address:
Bender GmbH, Repair-Service,
Londorfer Straße 65, 35305 Grünberg

Important information
8isoGEN523_D00320_04_M_XXEN/06.2018
1.2.3 Field service
On-site service for all Bender products
 Commissioning, parameter setting, maintenance, troubleshooting for products
 Analysis of the electrical installation in the building (power quality test, EMC test,
thermography)
 Training courses for customers
Telephone: [phone]**, -762 **(technical issues)
[phone]** (sales)
Fax: [phone]
E-mail: [email protected]
Internet: www.bender-de.com
*Available from 7.00 a.m. to 8.00 p.m. 365 days a year (CET/UTC+1)
**Mo-Thu 7.00 a.m. - 4.00 p.m., Fr 7.00 a.m. - 1.00 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
Bender sale and delivery conditions apply.
For software products the "Softwareklausel zur Überlassung von Standard-Software als
Teil von Lieferungen, Ergänzung und Änderung der Allgemeinen Lieferbedingungen
für Erzeugnisse und Leistungen der Elektroindustrie" (software clause in respect of the
licensing of standard software as part of deliveries, modifications and changes to gen-
eral delivery conditions for products and services in the electrical industry) set out by
the ZVEI (Zentralverband Elektrotechnik- und Elektronikindustrie e. V.) (German Electri-
cal and Electronic Manufacturer's Association) also applies.
Sale and delivery conditions can be obtained from Bender in printed or electronic for-
mat.
1.5 Inspection, transport and storage
Inspect the dispatch and equipment packaging for damage, and compare the contents
of the package with the delivery documents. In the event of damage in transit, please
contact Bender immediately. The devices must only be stored in areas where they are
protected from dust, damp, and spray and dripping water, and in which the specified
storage temperatures can be ensured.

Important information
9
isoGEN523_D00320_04_M_XXEN/06.2018
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 manufac-
turer.
 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 per-
sonnel working on the device. Furthermore, the rules and regulations that apply for ac-
cident 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 pol-
icies are implemented through the "Electrical and Electronic Equipment Act" (ElektroG).
According to this, the following applies:
 Electrical and electronic equipment are not part of household waste.
 Batteries and accumulators are not part of household waste and must be dis-
posed of in accordance with the regulations.
 Old electrical and electronic equipment from users other than private households
which was introduced to the market after 13 August 2005 must be taken back by
the manufacturer and disposed of properly.
For more information on the disposal of Bender devices, refer to our homepage at
www.bender-de.com -> Service & support.

10 isoGEN523_D00320_04_M_XXEN/06.2018
2. Safety instructions
2.1 General safety instructions
Part of the device documentation in addition to this manual is the enclosed "Safety in-
structions for Bender products".
2.2 Work activities on electrical installations
If the device is used outside the Federal Republic of Germany, the applicable local
standards and regulations must be complied with. The European standard EN 50110
can be used as a guide.
Only qualified personnel are permitted to carry out the work necessary to
install, commission and run a device or system.
DANGER
Risk of fatal injury due to 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 installing and connecting the device, make sure that the
installation has been de-energised. Observe the rules for working on
electrical installations.
Observe the information on nominal voltage and supply voltage
specified in the technical data!

Safety instructions
11
isoGEN523_D00320_04_M_XXEN/06.2018
2.3 Intended use
The ISOMETER® monitors the insulation resistance RFof unearthed AC, AC/DC and DC
systems (IT systems) with nominal system voltages of 3(N)AC, AC/DC 0…400 V or
DC 0…400 V. The maximum permissible system leakage capacitance Ceis 5 µF. DC com-
ponents existing in AC systems do not influence the operating characteristics, when a
minimum load current of DC 10 mA flows. A separate supply voltage allows de-ener-
gised systems to be monitored, too.
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 op-
erating conditions. Please heed the limits of the range of application indicated in the
technical data.
Any use other than that described in this manual is regarded as improper.
Only qualified personnel are permitted to carry out the work nec-
essary to install, commission and run a device or system.
To ensure that the ISOMETER® functions correctly, an internal resistance of
≤ 1 kΩ must exist between L1/+ and L2/- via the source (e.g. the
transformer) or the load.
In the event of an alarm message of the ISOMETER®, the insulation fault
should be eliminated as quickly as possible.
If the ISOMETER® is installed inside a control cabinet, the insulation fault
message must be audible and/or visible to attract attention.

12 isoGEN523_D00320_04_M_XXEN/06.2018
3. Device description
3.1 Device features
 Monitoring the insulation resistance RFfor unearthed AC/DC systems
 Measurement of the nominal system voltage Un(true RMS) with undervoltage
and overvoltage detection
 Measurement of residual voltages to earth (L1+/PE and L2-/PE)
 Two operating modes: GEn and dc
 Automatic adaptation to the system leakage capacitance Ceup to 5 F
 Selectable start-up delay, response delay and delay on release
 Two separately adjustable response value ranges of 5…200 k (Alarm 1, Alarm 2)
 Automatic device self test with connection monitoring
 Selectable N/C or N/O relay operation
 Fault memory can be activated
 RS-485 (galvanically isolated) including the following protocols:
– BMS interface (Bender measuring device interface) for data exchange with
other Bender components
– Modbus RTU
– IsoData (for continuous data output)
3.2 Functional description
The ISOMETER® measures the insulation resistance RF. It features two operating modes:
GEn and dc.
3.2.1 GEn mode
GEn mode is used in AC/DC or DC systems. The device complies with
the maximum response time of ≤1s for Ce≤1 µF and RF≤Ran/2.
3.2.2 dc mode
dc mode is only used in DC systems. In this mode, the device complies with the
maximum response time of ≤ 1s for Ce≤ 2 µF and RF≤ Ran/2 in the event of asym-
metrical insulation faults. In case of symmetrical insulation faults response times of
≤ 10 s for Ce≤ 5 µF and RF≤ Ran/2 are complied with. The system leakage capaci-
tance Ceis also measured in this mode.

Device description
13
isoGEN523_D00320_04_M_XXEN/06.2018
3.2.3 General measuring functions
The ISOMETER® measures the RMS value of the nominal system voltage Unbetween L1/
+ and L2/- as well as the residual voltages UL1e (between L1/+ and earth) and UL2e
(between L2/- and earth).
When coupled to a DC system , the ISOMETER® determines from a minimum value of
the nominal system voltage the fault y conductor L1/+ or L2/- which shows the distri-
bution of the insulation resistance between conductors L1/+ and L2/-. The distribution
is indicated by a "+" or "-" sign preceding the insulation resistance measurement. The
value range of the fault y conductor is ±100 %:
The partial resistances can be calculated from the total insulation resistance RFand the
fault y conductor (R %) using the following formula:
 Fault on conductor L1/+ ->RL1F = (200 % * RF)/(100 % + R %)
 Fault on conductor L2/- -> RL2F = (200 % * RF)/(100 % – R %)
When the ISOMETER® is coupled to an AC system, the fault y conductor can only be de-
termined in a connected DC system and the fault is detected either on L1/+ (+100 %) or
L2/- (-100 %). Calculating the fault distribution is not possible in this case.
If the values RFor Unreach or violate the activated response values for the period ton
without interruption, an alarm is signalled via the relays "K1" and "K2". If the values RFor
Undo not reach or violate their release value (response value plus hysteresis) for the pe-
riod toff without interruption, the alarm relays will switch back to their initial position. If
the fault memory is enabled, the alarm relays remain in the alarm state until the external
test/reset button is pressed or until the supply voltage is switched off.
The device function can be tested using the external T/R button. Parameterisation of
the ISOMETER® is possible via the BMS bus, for example by means of a BMS-Ethernet
gateway (COM465IP) or Modbus RTU.
3.2.4 Isolation from the system to be monitored
If the device has no supply voltage or is in stop mode (see page 16), it decouples termi-
nals L1/+ and L2/- internally from the IT system being monitored. In this case, an insu-
lation measurement up to DC 500 V can be carried out using an insulation tester.
Indication Meaning
-100 % One-sided fault on conductor L2/-
0 % Symmetrical fault
+100 % One-sided fault on conductor L1/+

Device description
14 isoGEN523_D00320_04_M_XXEN/06.2018
3.2.5 Monitoring the insulation resistance
The two parameters "R1" and "R2" monitor the insulation resistance. 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, then this leads to an alarm message. If RFexceeds the val-
ues R1 or R2 plus the hysteresis value (see table on page 23), the alarm will be cleared.
3.2.6 Undervoltage/overvoltage monitoring
The two parameters "U <" and "U >" can be activated or deactivated for monitoring the
nominal system voltage Un. The maximum undervoltage value is limited by the over-
voltage value. The RMS value of the system voltage is monitored. If the nominal system
voltage Unreaches, falls below or exceeds the limit values ("U <" or "U >"), an alarm will
be signalled. If the maximum permissible system voltage set for the ISOMETER® is ex-
ceeded, an alarm will be triggered even if the overvoltage limit value has been deacti-
vated. The alarm will be deleted when the limit values plus hysteresis are no longer
violated.
3.2.7 Self test/Device fault
The integrated self test function checks the function of the insulation monitoring de-
vice and the connection to earth and to the IT system to be monitored. By pressing the
external test/reset button a self test is started. In the event of a fault, relay 2 ("K2")
switches and the measuring function is interrupted. Internal device errors can be
caused by external disturbances or internal hardware errors. After eliminating the fault,
the alarm relays switch back automatically or by pressing the external T/R button (see
page 16). The self test can take up to 30 s.
It can be suppressed for the duration of the device start by setting the parameter in the
menu "SEt" to"S.Ct = off" (i.e. device test after device start = off). This allows the ISOME-
TER® to enter measurement mode quickly after connecting the supply voltage Us.
If the error message occurs again after restarting the device or after a reset to factory
settings, the device must be repaired.
Automatic self test
The device runs a self test after connecting to the supply voltage Usand then every
24 h.

Device description
15
isoGEN523_D00320_04_M_XXEN/06.2018
3.2.8 Malfunction
In addition to the described self test, several functions in the insulation monitoring de-
vice are continuously checked during operation. If the error occurs again after restart-
ing the device or after restoring the factory settings, please contact Bender Service.
3.2.9 Signalling assignment of the alarm relays K1/K2
The signalling assignment of the alarm relays "K1" and "K2" is listed in the relay signal-
ling assignment table "r1" and "r2".
3.2.10 Measuring and response times
Operating time tae
The operating time tae is the time required by the ISOMETER® to determine the meas-
ured value. It applies to the insulation measurement value RF, the system leakage ca-
pacitance Ce, residual voltages UL1e and UL2e as well as the faulty conductor "R %" and
is dependant on the insulation resistance RFand the system leakage capacitance Ceof
the system to be monitored. System disturbances may lead to extended measuring
times. The measurement time for the system voltage Unis independent and considera-
bly shorter.
Response delay ton
The response delay ton is set uniformly for all messages, whereby each alarm message
specified in the alarm assignment hast 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 violated 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.

Device description
16 isoGEN523_D00320_04_M_XXEN/06.2018
Delay on release toff
The delay on release toff can be set uniformly for all messages using the parameter
"toff", whereby each alarm message specified in the alarm assignment hast its own
timer for toff. An alarm will continuously be signalled until the threshold value of the re-
spective measured value is not violated (including hysteresis) for the period of toff with-
out 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.
3.2.11 Factory settings FAC
Activating the factory settings will reset all modified settings, with the exception of the
interface parameters, to the default upon delivery.
3.2.12 External, combined test or reset button T/R
Reset= Press the external button < 1.5 s
Reset with subsequent test= Press the external button > 1.5 s
Stop mode = Press and hold the external button
Only one ISOMETER® may be controlled via an external test/reset button. A galvanic
parallel connection of several test or reset inputs for testing multiple insulation moni-
toring devices is not allowed.
3.2.13 Fault memory
The fault memory can be activated or deactivated. When the fault memory is activated,
all pending alarm messages of the relays remain available until they are deleted by us-
ing the reset button (internal/external) or the supply voltage Usis turned off.
Stop mode can also be triggered via an interface command and in this
case it can only be reset via the interface.

Device description
17
isoGEN523_D00320_04_M_XXEN/06.2018
3.2.14 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). Data transmission generally makes use of ASCII characters.
• 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
networks. Modbus RTU messages have a 16-bit CRC (Cyclic Redundant Checksum),
which guarantees reliability.
• IsoData
The ISOMETER® continuously sends an ASCII data string with a cycle of approximately
1 s. Communication with the ISOMETER® within this mode is not possible and no addi-
tional transmitter may be connected to the RS-485 bus cable. The ASCII data string for
the ISOMETER® is described on page 40.
The isoGEN523 identifies itself on the BMS bus with the
device name "isoGEN423".
The isoGEN523 identifies itself on the Modbus with the
device name "isoGEN423".
Transmission from the isoGEN523 via the IsoData protocol can be stopped
by sending the command"Adr3" during an interval.

Device description
18 isoGEN523_D00320_04_M_XXEN/06.2018
Parameter address, baud rate and parity can be parameterised via the RS-485 interface.
The IsoData protocol is activated by setting "Adr = 0".
The parameter value "---" for the baud rate indicates the activated BMS
protocol. In this case, 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.

19
isoGEN523_D00320_04_M_XXEN/06.2018
4. Installation and connection
Only qualified personnel are permitted to carry out the work necessary to
install, commission and run a device or system.
DANGER
Risk of fatal injury due to 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 installing and connecting the device, make sure that the
installation has been de-energised. Observe the rules for working on
electrical installations.
Observe the information on the rated voltage and supply voltage
specified in the technical data!

Installation and connection
20 isoGEN523_D00320_04_M_XXEN/06.2018
4.1 Installation
Screw mounting:
Fix the device with two M4 screws, see the following sketch.
Abb. 4.1: Dimension diagram (front and side view, bottom view)
4.2 Connection of the device
The wires 1 and 2 ("A1" and "A2") have to be connected to the supply voltage Usaccord-
ing to IEC 60364-4-43, which means, the connections have to be protected against short
circuit by means of a protective device (a 6 A fuse is recommended). Devices for protec-
tion against short-circuit in conformity with IEC 60364-4-43 for the connection of termi-
nals "L1/+"/"L2/-" to the IT system to be monitored 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.
Only one ISOMETER® may be controlled via an external test/reset button. It is not al-
lowed to use a parallel connection of several test or reset inputs for combined testing
of ISOMETER®s.
70
46
95
70
5923.5 12.5
50
10
Signal cable
(Wires 1-12)
Side view
Front view
Unten
Bottom view
All dimensions are in mm