Bender ISOMETER iso415R User manual

Manual ENiso415R-x_D00401_00_M_XXEN / 04.2021
ISOMETER® iso415R
Insulation monitoring device for unearthed
3(N)AC, AC and DC systems (IT systems)

2 iso415R-x_D00401_00_M_XXEN / 04.2021
Service and support for Bender products
First-level support
Technical support
Carl-Benz-Strasse 8 • 35305 Grünberg • Germany
Telephone: [phone]
0700BenderHelp *
Fax: [phone]
E-mail: [e-mail]
Available on 365 days from 7.00 a.m. to 8.00 p.m. (MEZ/UTC +1)
* Landline German Telekom: Mon-Fri from 9.00 a.m. to 6 p.m.: 6.3 cents/30 sec.; remaining time: 6.3
cents/min.
Mobile phone: higher, depending on mobile phone tari
Repair service
Repair, calibration and replacement service
Londorfer Strasse 65 • 35305 Grünberg • Germany
Telephone: [phone] (technical issues) or
[phone], -785 (commercial issues)
Fax: [phone]
E-mail: [email protected]
Field service
On-site service
Telephone: [phone], -762 (technical issues) or
[phone] (commercial issues)
Fax: [phone]
E-mail: [e-mail]
Mon-Thu 7.00 a.m. to 4.00 p.m., Fri 7.00 a.m. to 1 p.m. (MEZ/UTC +1)

iso415R-x_D00401_00_M_XXEN / 04.2021 3
ISOMETER® iso415R
Table of contents
1 General instructions .........................................................................5
1.1 How to use this manual..............................................................................................5
1.2 Indication of important instructions and information ...................................5
1.2.1 Signs and symbols........................................................................................................5
1.3 Training courses and seminars.................................................................................5
1.4 Delivery conditions.......................................................................................................5
1.5 Inspection, transport and storage ..........................................................................6
1.6 Warranty and liability...................................................................................................6
1.7 Disposal of Bender devices........................................................................................6
1.8 Safety.................................................................................................................................6
1.9 Intended use...................................................................................................................7
2 Function...............................................................................................8
2.1 Device features ..............................................................................................................8
2.2 Device-specific instructions.......................................................................................8
2.3 Functional description ................................................................................................8
2.3.1 Insulation fault RF..........................................................................................................9
2.3.2 Insulation fault location R% ......................................................................................9
2.3.3 System leakage capacitance Ce................................................................................9
2.3.4 Connection monitoring L1/L2..................................................................................9
2.3.5 Connection monitoring E/KE.................................................................................10
2.3.6 Manual self test...........................................................................................................10
2.3.7 Malfunction ..................................................................................................................10
2.3.8 Alarm assignments to the alarm relay................................................................10
2.3.9 Delay times tb, t, ton and toff .....................................................................................10
2.3.9.1 Recovery time tb.....................................................................................................................10
2.3.9.2 Start-up delay t.......................................................................................................10
2.3.9.3 Response delay ton.................................................................................................................10
2.3.9.4 Delay on release toff ..............................................................................................................11
2.3.10 Factory settings FAC .................................................................................................11
2.3.10.1 Factory settings excluding interface parameters......................................................11
2.3.10.2 Factory settings including interface parameters.......................................................11
2.3.11 Fault memory ..............................................................................................................11
2.3.12 Start with alarm ..........................................................................................................11

4 iso415R-x_D00401_00_M_XXEN / 04.2021
3 Mounting and connection............................................................. 12
3.1 Mounting.......................................................................................................................12
3.2 Connection iso415R ..................................................................................................13
3.2.1 Wiring diagrams ........................................................................................................13
3.2.1.1 Supply voltage US..................................................................................................................14
3.2.1.2 RS-485 interface .....................................................................................................................15
3.2.1.3 Relay ...........................................................................................................................................15
4 Operation and settings on the device ........................................ 16
4.1 Control panel iso415R..............................................................................................16
4.1.1 STATUS LED..................................................................................................................16
4.1.2 ALARM LEDs.................................................................................................................17
4.1.3 VALUE DISPLAY LEDs................................................................................................17
4.1.4 Detent potentiometer response value prewarning Ran1 ..............................17
4.1.5 Detent potentiometer response value main alarm Ran2 ..............................18
4.1.6 T/R BUTTON..................................................................................................................18
4.1.6.1 "RESET" function ...................................................................................................................18
4.1.6.2 "TEST" function.......................................................................................................................18
4.1.6.3 "NFC" function ........................................................................................................................19
4.1.6.4 "ADDR" function.....................................................................................................................19
4.1.6.5 Write access to Modbus registers....................................................................................20
5 Modbus settings.............................................................................. 21
5.1 Overview........................................................................................................................21
5.1.1 Read and write accesses.......................................................................................... 21
5.1.2 Data types.....................................................................................................................21
5.1.3 Register ranges ...........................................................................................................21
5.2 Register table............................................................................................................... 22
6 Error – Cause – Error correction ................................................... 27
7 Technical data.................................................................................. 28
7.1 Standards and certifications .................................................................................. 29
7.2 Ordering information ...............................................................................................29

iso415R-x_D00401_00_M_XXEN / 04.2021 5
ISOMETER® iso415R
1 General instructions
1.1 How to use this manual
This manual is intended for qualified personnel working in electrical engineering and elec-
tronics!
Part of the device documentation, in addition to this manual, are the enclosed
"Safety instructions for Bender products".
Read the manual before mounting, connecting and commissioning the device.
Always keep the manual within easy reach for future reference.
1.2 Indication of important instructions and information
I Danger! Indicates a high risk of danger that will result in death or serious injury if not
avoided.
I Warning! Indicates a medium risk of danger that can lead to death or serious injury if not
avoided.
I Caution! Indicates a low-level risk that can result in minor or moderate injury or damage to
property if not avoided.
i
Information can help to optimise the use of the product.
1.2.1 Signs and symbols
Disposal Recycling Temperature range
Protect from moisture Protect from dust RoHS directives
1.3 Training courses and seminars
www.bender.de/en -> Know-how -> Seminars.
1.4 Delivery conditions
The conditions of sale and delivery set out by Bender apply. These can be obtained from Bender
in printed or electronic format.
The following applies to software products:
"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
Die Elektroindustrie

6 iso415R-x_D00401_00_M_XXEN / 04.2021
General instructions
the electrical industry."
1.5 Inspection, transport and storage
Check the shipping and device packaging for transport damage and scope of delivery. The follow-
ing must be observed when storing the devices:
1.6 Warranty and liability
Warranty and liability claims in the event of injury to persons or damage to property are excluded
in case of:
• Improper use of the device.
• Incorrect mounting, commissioning, operation and maintenance of the de-
vice.
• Failure to observe the instructions in this operating manual regarding trans-
port, commissioning, operation and maintenance of the device.
• Unauthorised changes to the device made by parties other than the manu-
facturer.
• Non-observance of technical data.
• Repairs carried out incorrectly.
• Use of accessories and spare parts not recommended by Bender.
• Catastrophes caused by external influences and force majeure.
• Mounting and installation with device combinations not recommended by
the manufacturer.
This operating manual and the enclosed safety instructions must be observed by all persons
working with the device. Furthermore, the rules and regulations that apply for accident preven-
tion at the place of use must be observed.
1.7 Disposal of Bender devices
Abide by the national regulations and laws governing the disposal of this device.
For more information on the disposal of Bender devices, refer to

iso415R-x_D00401_00_M_XXEN / 04.2021 7
ISOMETER® iso415R
www.bender.de/en -> Service & support.
1.8 Safety
If the device is used outside the Federal Republic of Germany, the applicable local standards and
regulations must be complied with. In Europe, the European standard EN 50110 applies.
I Danger! Risk of fatal injury due to electric shock! Touching live parts of the system car-
ries the risk of:
- a fatal 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. the rules for Working on eleCtriCal systems must Be oBserveD.
1.9 Intended use
The ISOMETER® is an insulation monitoring device according to IEC 61557-8 for IT systems. It mon-
itors the insulation resistance of unearthed 3(N)AC, AC and DC main and control circuits (IT sys-
tems). The range of application and the maximum permissible system leakage capacitance of the
different models are specified in the chapter "Technical data".
The DC components existing in AC/DC systems can have an influence on the response behaviour
if an insulation fault occurs downstream of rectifiers with an electrolytic capacitor.
The separate supply voltage of the iso415R-24 also makes it possible to monitor a de-energised
system.
Intended use implies:
• Observance of all information in this operating manual
• Compliance with test intervals
In order to meet the requirements of applicable standards, customised parameter settings must
be made on the equipment in order to adapt it to local equipment and operating conditions.
Please heed the limits of the area of application indicated in the technical data.
Any other use than that described in this manual is regarded as improper.

8 iso415R-x_D00401_00_M_XXEN / 04.2021
Function
2 Function
2.1 Device features
• Monitoring of the insulation resistance for unearthed 3(N)AC, AC and DC systems with galvani-
cally connected rectifiers
• Automatic adaptation to the system leakage capacitance up to 25 μF
• Response time ≤ 6 s at Ce= 1µF and Rf= Ran/2
• Automatic device self test with connection monitoring
• Two separately adjustable response value ranges from 5 kΩ…1000 kΩ
• Alarms are output via LEDs (AL1, AL2) and an alarm relay
• Selectable N/C or N/O relay operation 1
• Selectable start-up delay, response delay and delay on release 1
• Fault memory 1
• RS-485 interface with Modbus RTU protocol
• NFC interface
2.2 Device-specific instructions
i
Operation inside a control cabinet.
Device signals must be visually perceptible outside the control cabinet.
i
IT systems with several ISOMETER®s.
Only one ISOMETER® may be installed in a galvanically connected system. In IT sys-
tems that are interconnected via coupling switches, ISOMETER®s that are not re-
quired must be disconnected from the IT system or deactivated. If IT systems are
coupled via capacitances or diodes, central control of the various ISOMETER®s must
be provided.
i
Prevent measurement errors!
In galvanically coupled DC circuits, an insulation fault can only be detected correctly
if a minimum current of > 10 mA flows through the rectifiers.
2.3 Functional description
The iso415R is used to monitor the insulation fault Fand to determine its location in unearthed
systems. In addition to the limit value comparison, functions for connection monitoring, detection
of device-internal errors and exceeding the maximum permissible leakage capacitance Ceare
available.
The measured value RFas well as all messages and alarms are displayed via the LEDs on the con-
trol panel and can be read out via the interfaces (Modbus RTU and NFC). Furthermore, the mes-
sages and alarms are also output via relay K1, depending on the alarm assignments that can be
set via the interfaces.
1 with app and Modbus RTU

iso415R-x_D00401_00_M_XXEN / 04.2021 9
ISOMETER® iso415R
2.3.1 Insulation fault RF
The insulation fault RFis measured in the range of 1 kΩ to 10 MΩ in unearthed 3(N)AC, AC, DC and
DC superimposed AC systems and output in the range of 1 kΩ to 1 MΩ via the value display LEDs.
RFcan be read from the interface register "Insulation resistance" in the range of 1 kΩ to 10 MΩ.
With each update of the measured value RF, the Modbus register "Measured value update coun-
ter" is incremented.
The two response values Ran1 and Ran2 are available for the limit value comparison. The two values
are set either manually via the detent potentiometers or in the "Ext" position via the interface reg-
isters "Response value Ran1" and "Response value Ran2".
If RFfalls below the limit values Ran1 or Ran2 without interruption for the duration of ton, the respec-
tive alarm AL1 or AL2 is set. If RFexceeds the respective limit values plus hysteresis without inter-
ruption for the duration of toff, the respective alarms AL1 or AL2 are deleted if the fault memory is
disabled.
The alarms AL1 and AL2 can be assigned to relay K1 via the interface registers "Alarm assignment
Alarm 1" and "Alarm assignment Alarm 2".
2.3.2 Insulation fault location R%
If the ISOMETER® detects a DC offset to earth of at least 10 V in the monitored system, the insula-
tion fault location R% is assigned to the positive or negative conductor with + or - 100 %. This can
occur when monitoring a DC system or an AC system with an insulation fault in the DC link. In the
case of symmetrical faults or below 5 V, R% is set to 0. The value of R% can be read via the inter-
face register "Insulation fault location".
2.3.3 System leakage capacitance Ce
If the measured value acquisition does not work due to an excessive system leakage capacitance
Ceor excessive disturbances in the system, the message "max. Ce/fault" appears and is indicated
by the LEDs. The message can be assigned to relay K1 via the interface register "Alarm assignment
max. Ce/fault".
2.3.4 Connection monitoring L1/L2
The connection monitoring L1/L2 continuously checks the low-resistance connection between
the terminals L1 and L2 of the ISOMETER® via the system to be monitored. If the resistance is too
high, the alarm L1/L2 is triggered and indicated by the LEDs.
The alarm can be assigned to relay K1 via the interface register "Alarm assignment L1/L2".
If the fault memory is not enabled, the alarm is automatically cleared after the connection fault
has been eliminated. Connection monitoring can be disabled via the interface register
"Connection monitoring L1/L2".

10 iso415R-x_D00401_00_M_XXEN / 04.2021
Function
2.3.5 Connection monitoring E/KE
The connection monitoring E/KE continuously checks the low-resistance connection of the
ISOMETER® between terminal E and earth with the input KE. If the resistance is too high, the alarm
E/KE is triggered and indicated by the LEDs.
The alarm can be assigned to relay K1 via the interface register "Alarm assignment E/KE". If the
fault memory is not enabled, the alarm is automatically cleared after the connection fault has
been eliminated.
2.3.6 Manual self test
By pressing the T/R button for > 3 s and < 6 s or by executing the Modbus function "Test", the de-
vice simulates an insulation fault and the connection to the system is checked. All LEDs light up.
This message can be assigned to relay K1 via the interface register "Alarm assignment Test". After
automatic completion of the test, the signalling status before the test is restored even if the fault
memory is enabled.
i
The test button should be pressed and the self test, including the relay function, should
be checked annually.
2.3.7 Malfunction
If an internal device error occurs, the status LED lights up RED. The error code can be queried via
the device interfaces.
2.3.8 Alarm assignments to the alarm relay
Based on the table „3.2.1.3 Relay“ on page 15, the alarms can be assigned to the relay via the
device interface.
2.3.9 Delay times tb, t, ton and toff
The times tb, t, ton and toff described below delay the output of alarms via LEDs, relay and Modbus
RTU.
2.3.9.1 Recovery time tb
The recovery time is the time the device needs to be ready for measurement after connecting the
supply voltage Us.
2.3.9.2 Start-up delay t
After connecting the supply voltage US, the measuring function is delayed by the set time t
(0…1800 s) plus the recovery time tb.
2.3.9.3 Response delay ton
The insulation monitoring device requires the operating time tae from the moment the measured
value falls below a response value until this violation is detected. The corresponding alarm is only
set if the violation is detected without interruption for the duration of the response delay time ton
(0...1800 s). The total response time tan is the sum of the operating time tae and the response delay
time ton.

iso415R-x_D00401_00_M_XXEN / 04.2021 11
ISOMETER® iso415R
2.3.9.4 Delay on release toff
When the fault memory is disabled, alarms are maintained until the measured value no longer vi-
olates the respective response value including hysteresis without interruption for the duration of
the delay on release toff (0....1800 s).
2.3.10 Factory settings FAC
The factory settings can be restored via the Modbus RTU interface. The required registers are de-
scribed in the Modbus table in chapter 5.2 on page 22. There are two options for restoring the
factory settings:
2.3.10.1 Factory settings excluding interface parameters
After restoring the factory settings, all previously changed settings are reset to the state upon de-
livery. The settings for the Modbus interface are not reset.
2.3.10.2 Factory settings including interface parameters
After restoring the factory settings, all previously changed settings including the settings for the
Modbus interface and the device address are reset to the state upon delivery.
2.3.11 Fault memory
The fault memory can be enabled or disabled via the interface register "Fault memory". Stored
alarms are reset by pressing the T/R button for > 1 s and < 3 s when the fault memory is enabled.
The fault memory is factory-set to disabled.
2.3.12 Start with alarm
This function, which can be enabled via the interface register "Start with alarm", makes the device
start with the measured value RF= 1 kΩ when it is restarted. The resulting alarm messages AL1
and AL2 are displayed until the measured value RFis above the respective limit values. The limit
value hysteresis and the fault memory for the respective alarm are not active during this start
phase.

12 iso415R-x_D00401_00_M_XXEN / 04.2021
Mounting and connection
3 Mounting and connection
i
Only qualified personnel are permitted to carry out the work necessary to install, com-
mission and run a device or system.
I risk of fatal injury due to electric shock! Touching live parts of the system carries the
risk of:
– a fatal 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. the rules for Working on eleCtriCal systems must Be oBserveD.
3.1 Mounting
Abb. 3–1 Dimensions in mm
18
8,8
100
109
93
64
48.5
45
1
65
35
2 x Ø 4,2
18
8,8
100
109
93
64
48.5
45
1
65
35
2 x Ø 4,2
Screw mountingDIN rail mounting
1.
2.
2.
1.
Click!
Removal
100
Nm
1.0
max. 2.5 mm
M4 ISO7380-1, DIN84
!

iso415R-x_D00401_00_M_XXEN / 04.2021 13
ISOMETER® iso415R
3.2 Connection iso415R
3.2.1 Wiring diagrams
Abb. 3–2 Connections iso415R-24 and iso415R–2
I Caution! seleCt CorreCt supply voltage!
applying an exCessive supply voltage usCan
Destroy the DeviCe. CorreCt values are:
iso415R-24: Us= DC24 V (floating!)
iso415R-2: Us= Un= aC/DC100…240V
Terminal Connection
L1, L2
iso415R-2
Nominal system voltage Un
Un= Us
E, KE Earth, Control earth
11, 14, 12 Alarm relay K1
iso415R-24: + / – Us: DC, + 24V oating
iso415R-2: ./ .No function
COM A / B RS-485 interface
A
B
+
–
14
12
11
24 V COM K1
iso415R-24
KE
E
L1
L2
Un
Us: DC 24 V floating
iso415R-2
A
B
.
.
14
12
11
COM K1
Un = Us: AC/DC 100…240 V
KE
E
L1
L2
Un
3AC 3NAC
AC
DC
L1
L2
L3
PE
L1 L2 KE E
2A 2A
COM465IP
RS-485
J-Y(St)Y 2x0,6
A B A B
11 14 12 +-
+-
2A 2A
L1
L2
L3
N
PE
L1 L2 KE E
2A 2A
2A 2A
2A 2A
L1
L2
PE
KE E
L1 L2
L+
L-
PE
KE E
L1 L2
DC 24 V
L1
L2
E KE
11 14 12
BA-+

14 iso415R-x_D00401_00_M_XXEN / 04.2021
Mounting and connection
The cables are connected to the device via push-in terminals. The maximum permissible conduc-
tor cross section is 1.5 mm².
I Caution! Short circuit. When finely stranded cables are inserted directly into the push-in termi-
nals, spliced wires can cause a short circuit. Use ferrules.
The terminals only allow the use of ferrules from 0.25 mm² to 1.5 mm². The maximum cross sec-
tion of 1.5 mm² should under no circumstances be exceeded!
Use crimping pliers which
1. do not exceed the permitted crimp width of the ferrule and
2. do not leave strong crimp impressions on the ferrule.
i
For a cross section of 1 mm² or more, use suitable crimping pliers similar to the models
"CRIMPFOX 6", "Weidmüller PZ6" or "Weidmüller PZ6/5".
3.2.1.1 Supply voltage US
<10 >1.5
10 1.5
10
1.5
<10 >1.5
10
1.5
10 1.5
<10
>1.5
10 1.5
10 1.5
S2
L1 L2 L3 N
Verbraucher
Load
S1
A1
US
~/+ ~/–
A2
RS-485
B
A
–
(+24 V) optional
+
11
14
12
S1 (k)
S2 (l)
L1
US
~/+ ~/–
L2
iso415R-24
The iso415R-24 is supplied with DC 24 V via the
+ and - terminals. The DC 24 V source must not
have a connection to earth.
i
No other devices that have a connection
to earth may be supplied from this volt-
age source. (e.g. additional iso415R devic-
es)
iso415R-2
The iso415R-2 is supplied from the system to
be monitored via terminals L1 and L2. The per-
missible voltage is in the range of AC/DC
100...240 V.
i
The device must be provided with back-
up fuses ( 2 A) in both terminals.

iso415R-x_D00401_00_M_XXEN / 04.2021 15
ISOMETER® iso415R
3.2.1.2 RS-485 interface
B
A
B
A
B
A
B
A
max. 1 m
max. 1200 m
120 Ω
120 Ω
Specification
The RS-485 specification restricts the cable
length to 1200m and requires a daisy chain
connection.
A twisted-pair, shielded cable must be used as
bus cable. For example, cable type J-Y(St)Y
nx2x0.8 mm² is suitable. The shield must be
connected to PE at one end.
Termination
The bus cable must be terminated at both ends
with resistors (120 Ω, > 0.25 W). The terminat-
ing resistors are connected in parallel to the
terminals A and B.
i
If there are more than 16 bus devices, the
interface must be designed to be shock-
proof, because the maximum permissible
total leakage current of 0.5 mA is exceed-
ed.
3.2.1.3 Relay
The terminals 11,14,12 are relay outputs. The
following settings can be made via the Modbus
RTU interface:
i
Caution! High contact currents damage
the hard gold plating of the relay con-
tacts. Damaged contacts prevent the re-
lay from switching correctly at low con-
tact currents.
S2
L1 L2 L3 N
Verbraucher
Load
S1
A1
US
~/+ ~/–
A2
RS-485
B
A
–
(+24 V) optional
+
11
14
12
S1 (k)
S2 (l)
Function State Description
Relay mode NO principle |
NC principle
The relay mode can be adapted to the application:
• N/C NC operation of the contacts 11-14-12. In fault-free condition,
the alarm relay is energised.
• N/O NO operation of the contacts 11-14-12. In fault-free condition,
the alarm relay is de-energised.
Test on* | o This parameter determines whether the relay is actuated during a test
Main alarm on* | o The relay switches when the measured value falls below the response value of the main
alarm AL2
Prewarning on | o* The relay switches when the measured value falls below the response value of the prewarn-
ing AL1
Device error on* | o The relay switches if a device error exists
Connection fault
system
on* | o The relay switches when there is a system connection fault (L1, L2).
Connection fault earth on* | o The relay switches when there is a connection fault to earth (E, KE).
Ceexceeded on* | o The relay switches when the permissible system leakage capacitance Ceis exceeded.
* Factory setting

16 iso415R-x_D00401_00_M_XXEN / 04.2021
Operation and settings on the device
4 Operation and settings on the device
4.1 Control panel iso415R
4.1.1 STATUS LED
Multicoloured display of various operating modes.
iso415R
T / R
Ran2 (kΩ)
Ext 700 400 200
100
70
40
20105
Ran1 (kΩ)
Ext 1k 700 400
200
100
70
402010
1k
100
10
1
kΩ
2
AL
1
ON
AC/DC
k Ω
L1
L2
E
L1´
L2´
KE
11 12 14
BA-+
A
B
C
D
E
F
Control panel
ASTATUS LED ON – operating modes
BALARM LEDs – AL1 / AL2
CVALUE DISPLAY LEDs – 1, 10, 100, 1k kΩ (1k = 1000 kΩ = 1 MΩ)
DDETENT POTENTIOMETER 1 – Response value prewarning Ran1
EDETENT POTENTIOMETER 2 – Response value main alarm Ran2
FT/R BUTTON –Test/Reset
i
To confirm a new detent potentiometer positi-
on, the new position is output for a few seconds
as a binary code (1= left stop, 10 = Ext) via the
value display LEDs. The LED "1k" is the least sig-
nificant bit (LSB).
iso415R
T / R
Ran2 (kΩ)
Ext 700 400 200
100
70
40
20105
Ran1 (kΩ)
Ext 1k 700 400
200
100
70
402010
1k
100
10
1
kΩ
2
AL
1
ON
AC/DC
k Ω
L1
L2
E
L1´
L2´
KE
11 12 14
BA-+
LED Operating mode
GREEN START PHASE
Device booting after start
NORMAL OPERATION
Device in fault-free state
YELLOW
flashing
with val-
ue display
LED
CONNECTION FAULT
• System leakage capacitance Ceexceeded: LED "10"
ashes
• Connection fault system(L1/L2): LED "100" ashes
• Connection fault earth (E/KE): LED "1k" ashes
RED DEVICE ERROR
Restart or replacement of the device required.

iso415R-x_D00401_00_M_XXEN / 04.2021 17
ISOMETER® iso415R
4.1.2 ALARM LEDs
Display of prewarning AL1 and main alarm AL2.
4.1.3 VALUE DISPLAY LEDs
Measured value display insulation resistance in kΩ
4.1.4 Detent potentiometer response value prewarning Ran1
The response value Ran1 can be set manually to the
scaled values with the detent potentiometer and
read from the Modbus register "Response value
Ran1".
Changing the response value in the Modbus regis-
ter "Response value Ran1" is only possible in
switch position "Ext".
The last response value Ran1 stored via the inter-
face can be read from the Modbus register
"Response value Ran1_ext". It is applied to the re-
sponse value Ran1 when the setting is changed
from a manual value to "Ext".
iso415R
T / R
Ran2 (kΩ)
Ext 700 400 200
100
70
40
20105
Ran1 (kΩ)
Ext 1k 700 400
200
100
70
402010
1k
100
10
1
kΩ
2
AL
1
ON
AC/DC
k Ω
L1
L2
E
L1´
L2´
KE
11 12 14
BA-+
LED Operating state
AL1 PREWARNING
Lights permanently when the value falls below the prewarning
threshold Ran1.
AL2 MAIN ALARM
Lights permanently when the value falls below the main alarm
threshold Ran2.
iso415R
T / R
Ran2 (kΩ)
Ext 700 400 200
100
70
40
20105
Ran1 (kΩ)
Ext 1k 700 400
200
100
70
402010
1k
100
10
1
kΩ
2
AL
1
ON
AC/DC
k Ω
L1
L2
E
L1´
L2´
KE
11 12 14
BA-+
LED Operating state
1Lights permanently when the current measured value is ≤1 kΩ.
10 • Lights permanently when the current measured value is ≤10
kΩ.
• Flashes synchronously with the yellow status LED when the
system leakage capacitance Cehas been exceeded.
100 • Lights permanently when the current measured value is ≤
100 kΩ .
• Flashes synchronously with the yellow status LED when there is
a connection fault of the system (L1/L2).
1k • Lights permanently when the current measured value is ≤1
MΩ.(1k = 1000 kΩ = 1 MΩ)
• Flashes synchronously with the yellow status LED when there is
a connection fault to earth (E, KE).
iso415R
T / R
Ran2 (kΩ)
Ext 700 400 200
100
70
40
20105
Ran1 (kΩ)
Ext 1k 700 400
200
100
70
402010
1k
100
10
1
kΩ
2
AL
1
ON
AC/DC
k Ω
L1
L2
E
L1´
L2´
KE
11 12 14
BA-+

18 iso415R-x_D00401_00_M_XXEN / 04.2021
Operation and settings on the device
4.1.5 Detent potentiometer response value main alarm Ran2
The response value Ran2 can be set manually to the
scaled values with the detent potentiometer and
read from the Modbus register "Response value
Ran2".
Changing the response value in the Modbus regis-
ter "Response value Ran2" is only possible in
switch position "Ext".
The last response value Ran2 stored via the inter-
face can be read from the Modbus register
"Response value Ran2_ext". It is applied to the re-
sponse value Ran2 when the setting is changed
from a manual value to "Ext".
iso415R
T / R
Ran2 (kΩ)
Ext 700 400 200
100
70
40
20105
Ran1 (kΩ)
Ext 1k 700 400
200
100
70
402010
1k
100
10
1
kΩ
2
AL
1
ON
AC/DC
k Ω
L1
L2
E
L1´
L2´
KE
11 12 14
BA-+
4.1.6 T/R button
The T/R button activates dierent functions and editing modes depending on how long it is
pressed.
Overview
4.1.6.1 "RESET" function
The "RESET" function resets stored alarm states and disables the limit value hysteresis for that mo-
ment.
4.1.6.2 "TEST" function
The "TEST" function simulates an insulation fault for 5 seconds.
During this period, the device has the following states:
• Display of the alarm value via the LEDs and the interface.
• The relays switches when the alarm assignment "Test" has been activated.
• The test status can be read out via the interface:
– 0 = no test, 1 = internal test (local), 2 = external test (interface)
• ton and toff are set to 0 s for the duration of the test
Editing mode Period STATUS LED
RESET 1 s to 3 s ashes yellow
TEST 3 s to 6 s ashes red
NFC 6 s to 10 s ashes blue
ADDR 10 s to 15 s ashes green
PROTECT 20 s to 25 s ashes violet
iso415R
T / R
Ran2 (kΩ)
Ext 700 400 200
100
70
40
20105
Ran1 (kΩ)
Ext 1k 700 400
200
100
70
402010
1k
100
10
1
kΩ
2
AL
1
ON
AC/DC
k Ω
L1
L2
E
L1´
L2´
KE
11 12 14
BA-+
RESET TEST NFC ADDR
1 s 3 s 6 s 10 s 20 s
PROTECT
25 s
ON | OFF
15 s
ON | OFF
T / R

iso415R-x_D00401_00_M_XXEN / 04.2021 19
ISOMETER® iso415R
4.1.6.3 "NFC" function
The "NFC" function changes the current activation state of the NFC interface when the T/R button
is pressed for 6 to 10 seconds. The NFC interface is deactivated automatically after 5 minutes if it
has not been manually deactivated beforehand.
4.1.6.4 "ADDR" function
The "ADDR" function puts the device into the editing mode for the RS-485 address. The LED
measured value display and the status LED indicate the devices address.
How to enter an address:
1. Press T/R button until the status LED flashes green.
– After releasing the T/R button, the status LED lights RED.
2. Set HUNDREDS DIGIT. Briefly press the T/R button several times until the desired value is
set. Press and hold T/R button once (> 2 s) to confirm.
– After releasing the T/R button, the status LED lights GREEN.
3. Set TENS DIGIT. Briefly press the T/R button several times until the desired value is set.
Press and hold the T/R button once (> 2 s) to confirm.
– After releasing the T/R button, the status LED lights BLUE.
4. Set UNITS DIGIT. Briefly press the T/R button several times until the desired value is set.
Press and hold the T/R button once (> 2 s) to confirm.
5. To exit the address setting mode, press and hold the T/R button once (2 s).
– After releasing the T/R button, the status LED lights GREEN.
The address values are displayed via BCD code.
Addresses can only be entered within the valid address range. If no input is made for the period
of 5 minutes, the addressing mode is automatically exited. The device then uses the currently set
Modbus address.
NFC
1,5 s
Current address: 153
Factor
4
1
2
8
x100 x10 x1
Sum
Status display normal operation with activated NFC interface

20 iso415R-x_D00401_00_M_XXEN / 04.2021
Operation and settings on the device
4.1.6.5 Write access to Modbus registers
The " PROTECT" function disables or enables write access to the Modbus registers of the parame-
ters. Via the Modbus register "Write access", write access can only be disabled, but no longer ena-
bled.
• If the T/R button is pressed for at least 20 seconds, the status LED changes
from steady green to flashing violet and remains in this state for 5 seconds
if the button is held down.
• If the T/R button is released during the period in which the status LED flash-
es violet, the state of the Modbus register "Write access" changes from the
current to the alternative setting, i.e. from "enabled" to "disabled" or vice
versa.