Bender ISOMETER isoPV1685RTU User manual

EN
Manual
isoPV1685xxx_D00007_05_M_XXEN/02.2020
Insulation monitoring device
for unearthed DC systems
for photovoltaic systems up to 1500 V
isoPV1685RTU: software version D0532 V2.0x
isoPV1685P : software version D0525 V2.0x
ISOMETER®
isoPV1685RTU
isoPV1685P

Bender GmbH & Co. KG
Postfach 1161 • 35301 Gruenberg • Germany
Londorfer Straße 65 • 35305 Gruenberg • Germany
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Web: www.bender.de
Customer service
Service-Hotline: 0700-BenderHelp (Telephone and Fax)
Carl-Benz-Straße 8 • 35305 Gruenberg • Germany
Tel.:[phone]
Fax:[phone]
E-Mail:[email protected]
© Bender GmbH & Co. KG
All rights reserved.
Reproduction only with permission
of the publisher.
Subject to change.

Table of contents
3isoPV1685xxx_D00007_05_M_XXEN/02.2020
1. Important information .................................................................... 5
1.1 How to use this manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Technical support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.1 End customer support and advice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.2 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.3 Customer service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Training courses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4 Delivery conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.6 Warranty and liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.7 Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2. Safety instructions ............................................................................ 7
2.1 General safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Working on electrical installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Device-specific safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Address setting and termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3. Function ............................................................................................. 9
3.1 Features isoPV1685RTU and isoPV1685P . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3.1 General functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3.2 µSD card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3.3 Insulation monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3.4 Insulation fault location (isoPV1685P) . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3.5 Assignment of the alarm relays K1, K2, K3 . . . . . . . . . . . . . . . . . . . . . . 10
3.3.6 Measured value transmission to the control inputs of the inverter 10
3.3.7 History memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.4 Self test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.4.1 Self test after connection to the supply voltage . . . . . . . . . . . . . . . . 11
3.4.2 Automatic self test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.4.3 Manual self test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.4.3.1 Manual self test via the RS-485 interface . . . . . . . . . . . . . . . . . . . . . .11
3.4.3.2 Manual self test via CAN bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
4. Device overview ..............................................................................12
4.1 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
4.2 Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
4.3 Display and operating controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.3.1 Display elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.3.2 Operating elements in the service lid . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.3.3 Access to DIP switch and to the µSD card via the service lid . . . . .15
5. Installation and connection ..........................................................16
5.1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
5.2 Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
5.2.1 Connection requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
5.2.2 Wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
6. Commissioning ...............................................................................18
6.1 Commissioning flow chart insulation fault monitoring . . . . . . . . . . . . . .18
6.2 Commissioning flow chart insulation fault location
(isoPV1685P only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
7. Settings .............................................................................................19
7.1 Setting BMS address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
7.2 Setting an alarm for insulation faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
7.3 Setting the system leakage capacitance or measurement speed . . . .19
7.4 Parameter setting of the insulation fault location
(isoPV1685P only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
7.5 Deactivating the device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
7.6 Resetting alarm messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
7.7 Parameter setting with the iso1685 set tool. . . . . . . . . . . . . . . . . . . . . . . . .21

Table of contentsTable of contents
isoPV1685xxx_D00007_05_M_XXEN/02.2020
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8. Device communication .................................................................. 22
8.1 RS-485 interface with BMS and Modbus RTU protocol . . . . . . . . . . . . . . 22
8.1.1 Topology RS-485 network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8.2 BMS bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.2.1 BMS protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.2.2 Commissioning of an RS-485 network with BMS protocol . . . . . . . 23
8.2.3 Setting the BMS address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.2.4 Alarm and operating messages via BMS bus . . . . . . . . . . . . . . . . . . . . 24
8.2.5 Performing a firmware update via the BMS bus . . . . . . . . . . . . . . . . . 25
8.3 CAN bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8.4 Error codes BMS and CAN bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8.5 Modbus RTU (isoPV1685RTU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.5.1 Switching between BMS and Modbus . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.5.2 Commissioning RS-485 network with Modbus protocol . . . . . . . . 26
8.5.3 Setting Modbus address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.5.4 Modbus protocol settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.5.5 Scanning cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.5.6 Modbus register assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
9. Diagrams .......................................................................................... 29
9.1 The leakage capacitance depends on the insulation resistance . . . . . 29
9.2 Response time for insulation measurement . . . . . . . . . . . . . . . . . . . . . . . . 29
9.3 Example of alarms stored in the history memory. . . . . . . . . . . . . . . . . . . . 30
10. Factory settings ............................................................................ 31
11. Technical data ............................................................................... 32
11.1 isoPV1685... data in tabular form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
11.2 Standards, approvals and certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
11.3 Ordering details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
INDEX....................................................................................................... 34

isoPV1685xxx_D00007_05_M_XXEN/02.2020
5
Important information
1. Important information
1.1 How to use this manual
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!
Read the manual before you begin to mount, connect, and commission
the unit. Always keep the manual within easy reach for future reference
following commissioning.
DANGER
This signal word indicates that there is a high risk of danger that will re-
sult 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.
1.2 Technical support
1.2.1 End customer support and advice
Technical support by phone or e-mail for all Bender products
• Questions concerning specific customer applications
• Commissioning
• Troubleshooting
Telephone: [phone] (365 Tage von 07:00 - 20:00 Uhr [MEZ/UTC +1])
Fax: [phone]
0700BenderHelp (Tel. and Fax in Germany only)
E-mail: [email protected]
1.2.2 Repair
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
• Extended guarantee, in-house repair service, 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
1.2.3 Customer service
On-site service for all Bender products
• Commissioning, parameter setting, maintenance, troubleshooting
• 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
* Mo-Thu 07:00 a.m. - 16:00 p.m. , Fr 07:00 a.m. - 13:00 p.m.

Important informationImportant information
isoPV1685xxx_D00007_05_M_XXEN/02.2020
6
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 li-
censing 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 Manufacturers' Association) also applies. Amending the “General Conditions
for the supply of Products and Services of the Electrical and Electronics Industry” (GL)*
Sale and delivery conditions can be obtained from Bender in printed or electronic format.
1.5 Storage
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.
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 man-
ufacturer.
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 poli-
cies are implemented through the "Electrical and Electronic Equipment Act" (ElektroG).
According to this, the following applies:
• Electrical and electronic equipment are not part of household waste.
• Batteries and accumulators are not part of household waste and must be disposed
of in accordance with the regulations.
• Old electrical and electronic equipment from users other than private households
which was introduced to the market after 13 August 2005 must be taken back by the
manufacturer and disposed of properly.
For more information on the disposal of Bender devices, refer to our homepage at
www.bender-de.com -> Service & Support.

isoPV1685xxx_D00007_05_M_XXEN/02.2020
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 in-
structions for Bender products".
2.2 Working on electrical installations
If the device is used outside the Federal Republic of Germany, the applicable local stand-
ards and regulations must be complied with. The European standard EN 50110 can be
used as a guide.
2.3 Device-specific safety instructions
Only qualified personnel are permitted to carry out the work necessary
to install, commission and run a device or system.
DANGER
Risk of electrocution 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 in-
stallation has been de-energised. Observe the rules for working on elec-
trical installations.
DANGER
Danger as a result of excessive locating current or excessive locat-
ing voltage!
An excessive locating current of the internal locating current injector may
damage sensitive loads (e.g. control circuits) or trigger unwanted switch-
ing operations. Select a low locating current for these systems. In case of
doubt, please contact our service department (refer to Chapter "1.2 Tech-
nical support").
DANGER
Risk of electric shock!
When opening the device, you may come into contact with live parts.
Switch off the mains voltage before opening the device!
WARNING
Make sure that the basic settings meet the requirements of the IT system.
Persons without the required expertise, in particular children, must not
have access to or contact with the ISOMETER®.
CAUTION
Make sure that the operating voltage is correct!
Prior to insulation and voltage tests, the ISOMETER® must be disconnect-
ed from the IT system for the duration of the test. In order to check the cor-
rect connection of the device, a functional test has to be carried out before
starting the system.
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.
When using ISOMETER®s in IT systems, make sure that only one active ISO-
METER® is connected in each interconnected system. If IT systems are in-
terconnected via coupling switches, make sure that ISOMETER®s not
currently used are disconnected from the IT system and deactivated. IT
systems coupled via diodes or capacitances may also influence the insu-
lation monitoring process so that a central control of the different ISOME-
TER®s is required.
Prevent measurement errors!
When a monitored IT system contains galvanically coupled DC circuits, an
insulation fault can only be detected correctly if the rectifier valves (e.g.
rectifier diode, thyristors, IGBTs, frequency inverters, …) carry a minimum
current of > 10 mA.

Safety instructionsSafety instructions
isoPV1685xxx_D00007_05_M_XXEN/02.2020
8
2.4 Address setting and termination
Correct address setting and termination is essential for proper functioning of the device.
Ensure correct address setting and termination of the device!
Unspecified frequency range!
When connecting to an IT system with frequency components below the
specified frequency range, the response times and response values may
differ from the indicated technical data. However, depending on the ap-
plication and the selected measurement method, continuous insulation
monitoring is also possible in this frequency range.
There is no influence on the insulation monitoring for IT systems with fre-
quency components above the specified frequency range, e.g. within the
range of typical switching frequencies of frequency inverters (2…20 kHz).
CAUTION
Risk of bus errors!
Double assignment of addresses on the respective BMS or
CAN busses can cause serious malfunctions.
2.5 Intended use
The isoPV1685RTU and the isoPV1685P are used for insulation monitoring of large pho-
tovoltaic systems up to DC 1500 V designed as IT systems. The measurement method
specially developed for slow voltage fluctuations (MPP tracking) monitors the insulation
resistance even in systems equipped with large solar generator panels where extremely
high system leakage capacitances against earth exist due to interference suppression
methods. Adaptation to system-related high leakage capacitances also occurs automati-
cally.
The isoPV1685P generates locating current pulses required for insulation fault location.
That allows the localisation of the insulation fault using permanently installed or mobile
insulation fault locators.
Intended use also implies:
• The observation of all information in the operating manual
• Compliance with test intervals
In order to meet the requirements of applicable standards, the equipment must be ad-
justed to local equipment and operating conditions by means of customised parameter
settings. Please heed the limits of the range of application indicated in the technical data.
Any other use than that described in this manual is regarded as improper.
Only qualified personnel are permitted to carry out the work necessary
to install, commission and run a device or system.

isoPV1685xxx_D00007_05_M_XXEN/02.2020
9
Function
3. Function
3.1 Features isoPV1685RTU and isoPV1685P
• Insulation monitoring of large-scale photovoltaic systems
• Measurement of low-resistance insulation faults
• Separately adjustable response values Ran1 (alarm 1) and Ran2 (alarm 2) (both
200 …1 M) for prewarning and alarm. Ran1 ≥ Ran2 applies.
• Automatic adjustment to high system leakage capacitances up to 2000 µF,
selectable range
• Connection monitoring of L+, L- for reverse polarity
• Integrated locating current injector up to 50 mA (isoPV1685P only)
• Device self test with automatic message in the event of a fault
• Alarm relays separately adjustable for insulation fault 1, insulation fault 2 and device
error
• CAN interface to output measured values, statuses and alarms
• RS-485 interface
– isoPV1685P: BMS bus, e.g. to control the insulation fault location
– isoPV1685RTU: BMS bus or Modbus (can be switched using the DIP switch)
• µSD card with data logger and history memory for alarms
Tabular overview of features
The device version isoPV1685P provides a locating current injector.
isoPV1685RTU isoPV1685P
Insulation fault localisation
(locating current injector) X
Disconnection from the mains X
Digital inputs X X
µSD card X X
CAN bus X X
BMS bus X X
Modbus RTU X
The isoPV1685RTU uses the RS-485 interface for the BMS bus or for Mod-
bus RTU: The device can be switched between BMS and Modbus.
3.2 Product description
The ISOMETER® isoPV1685RTU is an insulation monitoring device for IT systems in accord-
ance with IEC 61557-8. The ISOMETER® isoPV1685P is an insulation monitoring device for
IT systems in accordance with IEC 61557-8 and IEC 61557-9.
The ISOMETER®s can be used in photovoltaic installations.
3.3 Functional description
3.3.1 General functional description
Insulation monitoring is carried out using an active measuring pulse which is superim-
posed onto the PV system to earth via the integrated coupling.
isoPV1685RTU:
If the insulation resistance between the PV system and earth falls below the preset pre-
warning response value Ran1, the "Alarm 1" LED lights and the alarm relay K1 switches. If
the value also falls below response value Ran2, the "Alarm 2" LED also lights and the alarm
relay K2 switches.
isoPV1685P:
If the insulation resistance between the PV system and earth falls below the preset pre-
warning response value Ran1, the "Alarm 1" LED lights and the alarm relay K1 switches. If
the value also falls below response value Ran2, the "Alarm 2" LED also lights and the alarm
relay K2 switches.
The locating current injector integrated in the device for insulation fault location is either
activated externally via the BMS interface or via the internal backup master function if no
external master has been connected. When starting the insulation fault location, the LED
"PGH on" signals the locating current pulse.
The insulation fault location can be started manually via the digital input 1, e.g. for insu-
lation fault location with mobile insulation fault locators (e.g. EDS195).

FunctionFunction
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3.3.2 μSD card
The integrated µSD card is used as data logger for storing all relevant events.
The following measured values, statuses and alarms are stored during operation:
• Insulation resistance and leakage capacitance
• System voltage, partial voltages to earth, supply voltages
• Temperature locating current injector (isoPV1685P only)
• Temperature coupling L+, L–
• Insulation fault
• Connection faults and device errors
Following each start-up, a new log file is generated. If the current file size exceeds 10
MByte during operation, a new file is generated. The file name contains the time and date
of the creation time. The typical time that is needed until the maximum file size is reached
is approximately 2 days. Hence, a SD card with a memory space of 2 GByte can record
data for approx. 400 days.
When the maximum data limit is reached on your card, the oldest file in each case will be
overwritten. The history memory that is also copied to the µSD card contains all alarms in
csv. format.
3.3.3 Insulation monitoring
For insulation monitoring, a pulsating AC measuring voltage is superimposed onto the IT
system. The measuring pulse consists of positive and negative rectangular impulses of
the same amplitude. The period duration depends on the system leakage capacitances in
each case and the insulation resistances of the system to be monitored.
Pulse sequence of the measuring voltage for insulation fault monitoring
An insulation fault between the IT system and earth closes the measuring circuit.
When the insulation resistance between the PV system and earth falls below the set re-
sponse values Ran1 and Ran2 (1 = prewarning, 2 = alarm), the associated alarm relay K1 (11,
12, 14) switches. Detected insulation faults are signalled to other bus devices via the BMS
bus and the CAN bus. In addition, the alarm LEDs Alarm 1 or Alarm 2 light up.
U
m
t
3.3.4 Insulation fault location (isoPV1685P)
For insulation fault location, a suitable locating current is superimposed onto the faulty
PV system with which EDS... insulation fault locators can locate insulation faults. The
isoPV1685P provides an internal locating current injector with IL≤DC 50 mA.
Pulse sequence of the internal locating current injector for insulation fault location
When permanently installed insulation fault locators (with master capability) such as the
EDS440 are used, control and synchronisation of the locating current injector is carried
out by one of the insulation fault locators in BMS master mode. For this purpose, the
isoPV1685P has to communicate with the insulation fault locator via the BMS bus.
3.3.5 Assignment of the alarm relays K1, K2, K3
Relay assignment
K1 switches when the value falls below the alarm response value Ran1 (insulation resist-
ance).
K2 switches when the value falls below the alarm response value Ran2 (insulation resist-
ance).
K3 switches in the event of a device error or a connection fault.
3.3.6 Measured value transmission to the control inputs of the inverter
All recorded measured values, operating messages and alarms are made available via the
CAN bus and the BMS bus.
During the insulation fault location process, the function of insulation re-
sistance measurement is deactivated and the coupling is disconnected
from the mains.
2 s 4 s 2 s 4 s
I
L
t

FunctionFunction
isoPV1685xxx_D00007_05_M_XXEN/02.2020
11
3.3.7 History memory
All warnings, alarms and device errors including "Come", "Go" and "Acknowledgement"
timestamps are stored in the internal history memory.
The history data are copied from the internal EEPROM to the History.csv file on the µSD
card under the following conditions:
• After device start-up
• During operation once per hour
• When a compatible µSD card has been inserted
For the evaluation of the history memory, the Excel tool "iso1685 History.xlsx" can be
made available. This tool allows csv.-file data to be processed and evaluated. By way of
example, history memory entries are shown on Page 30.
The tool includes detailed information about the use.
3.4 Self test
3.4.1 Self test after connection to the supply voltage
Once connected to the supply voltage, all internal measurement functions, the compo-
nents of the process control such as data and parameter memory as well as the connec-
tions to earth are checked. Once the self test is finished, after approx. 5 s the normal
measurement mode begins.
If a device error or a connection fault is detected, the corresponding alarm will be sig-
nalled via the CAN and the RS-485 interface as well as via the alarm relay K3 (31-32-34).
This relay continuously operates in N/C operation, i.e. it de-energises even in case of a
complete device failure. During this self test, when the device is being started, the alarm
relays K1 and K2 are not switched.
3.4.2 Automatic self test
All supply voltages are continuously monitored.
The following tests are continuously carried out in the background:
• Connection E-KE
• System polarity
• Temperature measurement
• Measuring voltage generator
3.4.3 Manual self test
The self test is started via the CAN or RS-485 interface by a Modbus or BMS master with
the test button or by any CAN bus device.
Only in the manual self test mode (via the CAN or RS-485 interface), the following tests
can be carried out:
• Internal Flash
• Internal RAM
• CPU register
• Watchdogs
• Oscillator
• Function of the Iso measurement technique
• Restart of the device including re-initialising and recalibration (only when the test is
requested via RS-485 interface)
3.4.3.1 Manual self test via the RS-485 interface
During the manual self test via the RS-485 interface, the alarm relays K1 (11-12-14) and K2
(21-22-24) are switched. K3 is only shortly switched after a device restart .
3.4.3.2 Manual self test via CAN bus
isoPV1685RTU and isoPV1685P:
During the insulation fault measurement test, the alarm relay K1 (11-12-14) and the
alarm relay K2 (21-22-24) are switched. K3 won't be switched.
Once a month, carry out a manual self test via the CAN or RS-485 interface
to ensure that the device functions correctly!

isoPV1685xxx_D00007_05_M_XXEN/02.2020
12
4. Device overview
4.1 Dimensions
SERVICE
ALARM 2
ISOMETER
®
isoPV1685
ON
ALARM 1
PGH ON
ALARM 3 (I∆n)
246 mm
125 mm40,5 mm
40,75 mm
51 mm
106 mm
64 mm
8,75 mm
5,2 mm
61,8 mm
76,6 mm
39,8 mm
55,7 mm
368 mm
383 mm
401,5 mm

Device overview
isoPV1685xxx_D00007_05_M_XXEN/02.2020
13
4.2 Connections
I2+ I2- I1+ I1-
I2+ I2- I1+ I1-
CAN1 CAN2 RS-485
Term.
off on A B S
A B S
k l kT IT
k I kT IT
31 32 34
K3
31 32 34
21 22 24
K2
21 22 24
11 12 14
K1
11 12 14
E KE
E KE
A1 A2
A1 A2
I2+
I2-
I1+
I1-
Digital inputs
RS-485 Term.
off
on
CAN 1
CAN 2
A, B, S
RS-485 bus
connection (A,B)
Protocol: BMS
or Modbus
k
I
kT
IT
31, 32, 34
Relay output
for device er-
ror ("Service"
21, 22, 24
Relayoutputfor
alarm
insulation fault
11, 12, 14
Relay output for
alarm
insulation fault
E, KE
Connection earth/reference.
Connect both to PE
A1, A2
Supply voltage DC 24
V.
Arbitrary polarity
L2/L-
L2/-
L1/L+
L1/+
Coupling terminal L2/L- Coupling terminal L1/L+

Device overview
isoPV1685xxx_D00007_05_M_XXEN/02.2020
14
ISOMETER
®
isoPV1685
ON
PGH ON
SERVICE
ALARM 1
ALARM 2
ALARM 3 (I
∆ n)
LEDs:
- ON: operation (flashes)
- PGH ON: Insulation fault location (isoPV1685P)
- SERVICE: device error, connection fault
- ALARM 1: Insulation fault
- ALARM 2: Insulation fault
DIP switch (SS8103)
Button (ST6101)
Memory card (SD card)

Device overviewDevice overview
isoPV1685xxx_D00007_05_M_XXEN/02.2020
15
4.3 Display and operating controls
4.3.1 Display elements
1ON
(green)
Power On indicator:
Flashes with a pulse duty factor of approx. 80 %.
Device error:
Lights continuously when the device stops functioning (device stopped).
Software update:
Flashes approx. three times faster during the firmware update than in the
standard mode, update time < 4 minutes.
2PGH ON
(yellow)
Insulation fault location (isoPV1685P only)
The LED "PGH ON" flashes during insulation fault location . It indicates that
the locating current for the insulation fault location is generated.
3SERVICE
(yellow)
Internal device error and connection fault .
(System, earth, measuring current transformer):
Lights continuously. Also refer to the list of error codes on Page 18
4ALARM 1
(yellow)
Insulation fault 1 (prewarning):
The "ALARM 1" LED lights continuously when the insulation resistance falls
below the response value 1, RF < Ran1
Flashes: Connection fault check earth
5ALARM 2
(yellow)
Insulation fault 2 (alarm):
The "ALARM 2" LED lights continuously when the insulation resistance falls
below the response value 2, RF < Ran2
6ALARM 3
(yellow) no function
SERVICE
ALARM 2
ON
ALARM 1
SERVICE
ALARM 2
ON
ALARM 1
PGH ON
ALARM 3 (I
∆ n)
1
2
3
4
5
6
4.3.2 Operating elements in the service lid
The representation below shows the position of the operating elements
4.3.3 Access to DIP switch and to the μSD card via the service lid
Open the service lid by pressing gently on the ribbed surface and pulling the lid from the
enclosure away.
After removing the lid the following settings can be carried out:
• Changing the BMS address or the Modbus address (SS8103)
• Setting the maximum leakage capacitance (SS8103)
• Changing the measurement speed (SS8103)
• Resetting alarms (ST6101)
In addition, you can access the µSD card to read out stored alarms, for example.
For a description of the DIP switches, refer to Chapter "7.3 Setting the system leakage ca-
pacitance or measurement speed" on Page 19.
Operating
elements Function
DIP switch
(SS8103)
isoPV1685RTU:
• Switching between BMS and Modbus: A4
• BMS /Modbus address setting: A3…A0
• Leakage capacitance setting
• Measurement speed setting
isoPV1685P:
• BMS address setting: A4…A0
• Leakage capacitance setting
• Measurement speed setting
Button
(ST6101) •Alarmreset
Memory card
(µSD card)
• Memory for log files and history memory
(µSD card);
μSDCard
SS8103
1
2
3
4
5
6
7
8
A4
A3
A2
A1
A0
ST6101
SERVICE
ALARM 2
ISOMETER®
iso1685FR
ON
ALARM 1
SERVICE
ALARM 2
ISOMETER
®
isoPV1685
ON
ALARM 1
PGH ON
ALARM 3 (I
∆ n)

isoPV1685xxx_D00007_05_M_XXEN/02.2020
16
Installation and connection
5. Installation and connection
5.1 Installation
Install the device using four M5 screws, also refer to the dimension diagram on Page 12
where the drilling holes are illustrated. Install the device so that it is in a vertical position
with the system coupling (L+, L–) positioned at the top when it is being operated. All di-
mensions in mm.
5.2 Connection
5.2.1 Connection requirements
Only qualified personnel are permitted to carry out the work necessary
to install, commission and run a device or system.
DANGER
Risk of electrocution 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 in-
stallation has been de-energised. Observe the rules for working on elec-
trical installations.
WARNING
Warning of insulation monitoring devices that do not work correct-
ly!
Connect the terminals KE and E individually to the protective earth con-
ductor PE.
CAUTION
Risk of injury from sharp-edged terminals!
Risk of lacerations. Touch the enclosure and the terminals with due care.
CAUTION
Risk of property damage due to unprofessional installation!
If more than one insulation monitoring device is connected to a conduc-
tively connected system, the system can be damaged. If several devices
are connected, the device does not work and does not signal insulation
faults. Make sure that only one insulation monitoring device is connected
in each conductively connected system.
Ensure disconnection from the IT system!
When insulation or voltage tests are to be carried out, the device must be
isolated from the system for the test period. Otherwise the device may be
damaged.
Check proper connection!
Prior to commissioning of the installation, check that the device has been
properly connected and check the device functions. Perform a functional
test using an earth fault via a suitable resistance.
All terminals are pluggable push-wire terminals. Solid connecting wires
can be directly plugged in. For connection of flexible cables, the push-wire
terminals must be pushed open by pressing the corresponding orange in-
terlocking mechanism with a flat-head screwdriver.

Installation and connectionInstallation and connection
isoPV1685xxx_D00007_05_M_XXEN/02.2020
17
5.2.2 Wiring diagram
Connect the device with the help of the connection and terminal diagram. Use the adja-
cent legend.
ISOMETER
®
iso1685
U
S
6A
31 32 34 11 12 1421 22 24
6A
1A
1A
BMS-/ Modbus-Master
2
PE
I2+ I2- I1+ I1- k I kT IT
+
–
A1 A2E KE
L2/-L1/+
A B S K1
K3 K2
CAN1 CAN2
RS485 Term.
PGH ON
SERVICE
ALARM 2
ISOMETER®
isoPV1685
ON
ALARM 1
PGH ON
ALARM 3 (I
∆ n)
Terminal,
Socket Connections
I2+, I2– Currently has no function, digital input.
I1+, I1– Digital input
isoPV1685P: Starting the insulation fault location in the manual mode
CAN2
CAN1
Connection to CAN bus, 2 x RJ-45, can be terminated with CAN 120-
termination plug.
A, B, S
Connection to Modbus or BMS bus, RS-485,
S= shield (connect one end to PE), can be terminated with terminating
switch RS-485 Term.
k, l/kT, lT no function
31, 32, 34 Alarm relay K3 for internal device errors.
21, 22, 24 Description of relay assignment according to device type, see Page 10;
Alarm relay K2 for insulation faults.
11, 12, 14 Alarm relay K1 for insulation faults.
E, KE Separate connection of E and KE to PE.
A1, A2 Connection to Us= DC 24 V via fuses, 6 A each.
L+ Connection to L+ of the PV generator via 1 A fuse.
L– Connection to L– of the PV generator via 1 A fuse.

isoPV1685xxx_D00007_05_M_XXEN/02.2020
18
Commissioning
6. Commissioning
6.1 Commissioning flow chart insulation fault monitoring
Netz = IT-System ?
Geräteanschluss
Un≤ DC1500 V ?
isoPV1685… nicht geeignet
nein
Vor dem Geräteanschluss Anlage
spannungsfrei schalten
E und KE an PE
Netz an L+/ L-
Optionaler Geräteanschluss
BMS-Bus bzw. Modbus an A, B, S
Speisespannung an A1/A2
Melde-Peripherie an K1, K2, K3
11-12-14, 21-22-24, 31-32-34
Speisespannung zuschalten
Netzspannung zuschalten
nein
ja
ja
ja
isoPV1685… nicht geeignet
Messstromwandler an k, l, kT, lT
Anschluss- oder Gerätefehler:
Anschlüsse prüfen
Soll Werkseinstellung
beibehalten werden? nein
ja
Einstellungen vornehmen über
Schalter SS8103, CAN, BMS
oder Modbus (isoPV1685RTU)
Sind alle Alarm-LEDs
ausgeschaltet?
ja
nein Eingestellter Ansprechwert ist
unterschritten, evtl. anpassen
Funktionsprüfung mit geeignetem
Widerstand von Netz nach Erde,
Größe: 50% des Ansprechwertes
Ran2
Alarm-LEDs leuchten?
Alarmrelais schalten?
ja
nein Anschlüsse kontrollieren
Widerstand entfernen
Das isoPV1685… ist funktions-
tüchtig und richtig angeschlossen
Alarm-LEDs erlöschen?
Alarmrelais umgeschaltet?
nein
Optional: Uhr einstellen
isoPV1685P: CAN
isoPV1685RTU: BMS, Modbus
Das isoPV1685… führt einen
erfolgreichen Selbsttest durch
CAN-Bus an CAN-Buchse
ja
nein
6.2 Commissioning flow chart insulation fault location
(isoPV1685P only)
Komponenten des
Isolationsfehlersuchsystems
EDS440 und zugehörige
Messwandler installieren
BMS-Busleitung des EDS-
Systems mit isoPV1685P
verbinden
Vor dem Geräteanschluss die
Anlage spannungsfrei schalten !
Alle BMS-Komponenten
adressieren,
ein Busmaster mit der
Adresse 1 ist erforderlich
Versorgungsspg. zuschalten
Netzspannung zuschalten
isoPV1685P führt einen
erfolgreichen Selbsttest durch
Funktionsprüfung mittels geeigne-
tem Widerstand von Netz nach Erde
hinter einem Messwandler.
Größe: 50% des niedrigsten An-
sprechwertes
Alarm-LEDs leuchten
Melderelais schalten
ja
nein EDS-Modus des isoPV1685P über
BMS-Bus auf„auto“ einstellen
Test-Taste des EDS 440
betätigen
Wird der fehlerbehaftete Abgang
richtig erkannt:
ADR:xx k:xx xxmA
ja
Sollen weitere installierte
Messwandler getestet werden?
Werden alle Messwandler von
EDS440 richtig erkannt? nein Verdrahtung der Messwandler
kontrollieren
ja
nein
ja
Widerstand entfernen und einen anderen
Abzweig für den Isolationsfehler nach einem
Messwandler wählen
LED "PGH ON" des
isoPV1685P blinkt.
Isolationsfehlersuche ist aktiv
Soll die Werkseinstellung
beibehalten werden?
ja
nein Im Menü der EDS-Geräte Einstellungen ändern,
die EDS-Parameter des isoPV1685P ändern
ja
nein Anschluss- oder Gerätefehler:
Anschlüsse prüfen
ja
Widerstand entfernen
Alarm-LEDs erloschen?
Alarm-Relais umgeschaltet?
Alarmmeldungen löschen:
Reset-Taste am EDS... betägigen
oder im Menü des EDS... EDS-Reset
aufrufen
nein
nein
Das EDS... ist funktionstüchtig und
richtig angeschlossen

isoPV1685xxx_D00007_05_M_XXEN/02.2020
19
Settings
7. Settings
7.1 Setting BMS address
Refer to "Setting the BMS address" on page 23.
7.2 Setting an alarm for insulation faults
You can set the limit values for alarm 1 and alarm 2 of the ISOMETER® via the BMS bus by
means of a BMS gateway (e.g. COM460IP) or a terminal program. Activation or deactiva-
tion of the two alarm levels Ran1 for alarm 1 and Ran2 for alarm 2 are illustrated in the fol-
lowing graphic:
An alarm will become inactive as soon as the hysteresis of the set operating value is ex-
ceeded.
One insulation resistance from 200 …1 M can be set respectively for alarm 1 and alarm
2. Condition: alarm 1 ≥ alarm 2.
t
R
R
an1
R
an2
Alarm 1
aktiv
Alarm 2
aktiv
Hysterese
Alarm 1
inaktiv
Hysterese
Alarm 2
inaktiv
7.3 Setting the system leakage capacitance or measurement
speed
The switch 6 of the DIP switch SS8103 is used to set the profile considering the maximum
system leakage capacitance Ce max.
The measurement speed can be changed using switch 7.
The switches 6 and 7 of the DIP switch SS8103 are used to switch the maximum system
leakage capacitance Ce max and the measurement speed. The measurement speed can be
set to "Slow" in case of frequently occurring fault alarms caused by transients in the sys-
tem. In the slow mode, the measurement time doubles. Segment 8 is reserved.
These settings may only be changed when the PV voltage is switched off.
When the maximum system leakage capacitance Ce max is set to 2000μF
the upper limit of measuring range for the insulation resistance decreases
from 1MΩ to 50kΩ. Therefore, check also the settings of the response val-
ue Ran.
DIP switch SS8103, segment 6:
OFF = 500 µF = Ce max
ON = 2000 µF = Ce max
Switch position:
Up = Off
Down = On
DIP switch SS8103, segment 7:
OFF = Fast
ON = Slow
S8103
1
2
3
4
5
6
7
8
A4
A3
A2
A1
A0

SettingsSettings
isoPV1685xxx_D00007_05_M_XXEN/02.2020
20
7.4 Parameter setting of the insulation fault location
(isoPV1685P only)
Set the value of the locating current required for insulation fault location to 1...50 mA. You
can make this setting via the BMS bus by means of a BMS gateway (e.g. COM460IP) or a
terminal program.
In order to be able to locate insulation faults, select one of the four available modes for
insulation fault location by means of the BMS gateway (e.g. COM460IP) or terminal pro-
gram via the BMS bus or Modbus.
off The insulation fault location is deactivated.
manual
In manual mode, the insulation fault location starts immediately. If you start the
insulation fault location, it remains active without considering the insulation
resistance and the alarm message of the ISOMETER®.
auto
In auto mode, the insulation fault location starts automatically as soon as the
response value of alarm 2 of the ISOMETER® has fallen below the preset value. The
insulation fault location is cyclically interrupted for an insulation measurement. If
the insulation fault still exists after the interruption, the insulation fault location
starts again. The insulation fault location only stops if alarm 2 is inactive. If a new
insulation fault appears, the insulation fault location restarts automatically.
1 cycle
In 1-cycle mode, the insulation fault location starts automatically as soon as the
response value of alarm 2 of the ISOMETER® has fallen below the preset value. The
insulation fault location is stopped after one cycle.
If the insulation fault still exists after the interruption, the insulation fault location
does NOT start again. If a new insulation fault appears, the insulation fault loca-
tion restarts automatically for one cycle.
Isolationsfehlersuche inaktiv
(Isolationsmessung)
Isolationsfehlersuche aktiv
für 1 Umlauf
Isolationsfehlersuche pausiert
(Isolationsmessung)
Isolationsfehlersuche aktiv
dauerhaft
Neuer Isolationsfehler
Modus: auto/1Uml. kein Isolationsfehler
Isolationsfehler
noch vorhanden
Manueller Start
Manueller Start.
Gerät bleibt im ursprünglich
eingestellten Modus
Manueller Stop.
Gerät bleibt im
ursprünglich
eingestellten
Modus
Modus: 1 Uml.
Modus: auto
7.5 Deactivating the device
When the device is deactivated, the coupling unit of the device (isoPV1685P only) is gal-
vanically isolated from the system being monitored.
The device can be activated or deactivated via the BMS channel 10:
• Activate the standby mode using the BMS command STDBY 1
• Deactivate the standby mode using the BMS command STDBY 0
• Query the current state using the BMS command TRSH? 10
The standby mode of the isoPV1685P, for example, allows team operation of inverters,
since only one insulation monitoring device may be connected in each interconnected
system.
7.6 Resetting alarm messages
Recorded faults are provided as alarm messages on the BMS bus and the CAN bus.
Pressing the reset button ST6101 will reset these alarm messages. If the fault continues to
exist, the message will be generated again.
The fault can also be reset by means of the acknowledgement command via the CAN bus.
A4
A3
A2
A1
A0
1
2
3
4
5
6
7
8