Bender ISOMETER isoRW425 User manual

Manual
ISOMETER® isoRW425
Insulation monitoring device for unearthed
IT AC-, AC/DC and DC systems
for railway applications up to AC/DC 400 V
Software version: D418 V1.0x
isoRW425_D00052_01_M_XXEN / 03.2014

Bender GmbH & Co. KG
Londorfer Str. 65 • 35305 Grünberg • Germany
P.O. Box 1161 • 35301 Grünberg • Germany
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Web: http://www.bender.de
©Bender GmbH & Co. KG
All rights reserved.
Reprinting only with permission
of the publisher.
Subject to change!

Table of Contents
3
isoRW425_D00052_01_M_XXEN / 03.2014
1. Making effective use of this document ....................................................... 5
1.1 How to use this manual ................................................................................. 5
1.2 Information about factory setting ............................................................. 5
2. Safety instructions ........................................................................................... 7
2.1 General safety instructions ........................................................................... 7
2.2 Work activities on electrical installations ................................................ 7
2.3 Intended use ...................................................................................................... 7
3. Function ............................................................................................................. 9
3.1 Device features ................................................................................................. 9
3.2 Description of function .................................................................................. 9
3.2.1 Undervoltage/overvoltage monitoring ................................................ 11
3.2.2 Connection monitoring .............................................................................. 11
3.2.3 Self test, automatic ....................................................................................... 11
3.2.4 Self test, manual ............................................................................................ 11
3.2.5 Malfunction ..................................................................................................... 12
3.2.6 Assigning alarm categories to alarm relays K1/K2 ............................ 12
3.2.7 Time delays t, ton and toff ....................................................................... 12
3.2.8 Password protection (on, OFF) ................................................................. 13
3.2.9 Automatic adaptation of the pulse duration ...................................... 13
3.2.10 Response time ................................................................................................ 13
3.2.11 Factory setting FAC ...................................................................................... 13
3.2.12 External, combined test resp. reset button T/R .................................. 13
3.2.13 Fault memory ................................................................................................. 13
3.2.14 History memory HiS ...................................................................................... 13
4. Installation, connection and commissioning ........................................... 15
4.1 Installation ....................................................................................................... 15

Table of Contents
4isoRW425_D00052_01_M_XXEN / 03.2014
4.2 Connection ...................................................................................................... 17
4.3 Commissioning .............................................................................................. 20
5. Operation and configuration ...................................................................... 21
5.1 Factory setting ............................................................................................... 21
5.2 Getting to know the user interface ......................................................... 22
5.3 Understand the display elements ........................................................... 23
5.3.1 Querying measured values ........................................................................ 24
5.3.2 Alarm indication when an insulation fault has been detected ..... 26
5.4 Display in menu mode ................................................................................ 27
5.4.1 Querying and setting parameters: Overview ...................................... 27
5.4.2 Navigation within the menu ..................................................................... 28
5.4.3 Selecting menus ............................................................................................ 31
5.4.4 Making settings in the AL menu .............................................................. 33
5.4.5 Making settings in the out menu ............................................................ 35
5.4.6 Making settings in the menu item t ....................................................... 41
5.4.7 Making settings in the SEt menu ............................................................. 43
5.4.8 Querying software number and software version with the INF
menu .................................................................................................................. 47
5.4.9 Querying and clearing the history memory using the HiS menu 47
6. Technical data ................................................................................................ 49
6.1 Tabular presentation .................................................................................... 49
6.2 Standards, approvals and certifications ................................................ 52
6.3 Ordering information ................................................................................... 52
6.4 Error codes ....................................................................................................... 53
INDEX .................................................................................................................... 55

5
isoRW425_D00052_01_M_XXEN / 03.2014
1. Making effective use of this document
1.1 How to use this manual
This manual is intended for electrically skilled persons working in
electrical engineering and electronics!
To make it easier for you to understand and revisit certain sections of text and
instructions in the manual, we have used symbols to identify important in-
structions and information. The meaning of these symbols is explained below:
1.2 Information about factory setting
If you want to reset the ISOMETER® to its factory setting in a specific case, refer
to page 45; page 21 provides a summary of all factory settings.
Information calling attention to hazards are marked
with this warning symbol.
Information intended to assist the user to make optimum
use of the product are marked with the Info symbol.

Making effective use of this document
6isoRW425_D00052_01_M_XXEN / 03.2014

7
isoRW425_D00052_01_M_XXEN / 03.2014
2. Safety instructions
2.1 General safety instructions
In addition to these operating instructions, the "Important safety instructions
for Bender products“, which are also included in the scope of supply, are an in-
tegral part of the device documentation.
2.2 Work activities on electrical installations
 Only skilled persons are permitted to carry out the work necessary to
install, commission and run a device or system.
 Compliance with the applicable regulations governing work on electri-
cal installations and with the regulations derived and associated with
them, is mandatory. EN50110 is of particular importance in this regard.
In particular, only test equipment of overvoltage category III or higher
may be used for fault detection.
 If the device is being used in a location outside the Federal Republic of
Germany, the applicable local standards and regulations must be com-
plied with. European standard EN 50110 can be used as a guide.
2.3 Intended use
The isoRW425 ISOMETER® monitors the insulation resistance of unearthed
AC/C main circuits (IT systems) with mains voltages of AC, AC/DC …V or
DC 0…400 V.
Danger as a result of unprofessional work!
Failure to carry out work on electrical installations prop-
erly and correctly can put life and limb at risk! Therefore,
observe the following safety instructions!

Safety instructions
8isoRW425_D00052_01_M_XXEN / 03.2014
DC components existing in AC/DC systems do not influence the operating
characteristics. A separate supply voltage allows de-energised systems to be
monitored too. The maximum permissible system leakage capacitance is
300µF.

9
isoRW425_D00052_01_M_XXEN / 03.2014
3. Function
3.1 Device features
 Insulation monitoring for unearthed AC and DC systems with galvani-
cally connected rectifiers or inverters
 Two separately adjustable response ranges of 1…990 k (Alarm 1,
Alarm 2)
 Automatic adaptation to the system leakage capacitance up to 300 F
 Measured value display via multi-functional LCD
 Measurement of the nominal system voltage (RMS) with undervoltage
and overvoltage detection
 Measurement of DC voltages system to earth (L+/PE and L-/PE)
 Alarm signalling via LEDs (AL1, AL2), display and alarm relays (K1, K2)
 N/C operation or N/O operation selectable
 Automatic device self test
 BMS interface (Bender measuring device interface) for data exchange
with other Bender components; RS-485 electrically isolated
 Start-up delay, response delay and delay on release
 Password protection to prevent unauthorised changes being made to
device settings
 Fault memory can be activated
 Connection monitoring
3.2 Description of function
The isoPV425 runs a device test when the supply voltage is connected. and
the start-up delay has elapsed. Then, the insulation resistance of the system is
determined.
When the values are below the set response values Ran1 bzw. Ran2, the re-
sponse delay ton begins. Once the response delay "ton" has elapsed, the alarm
relays "K1/K2" switch and the alarm LEDs "AL1/AL2" light up.

Function
10 isoRW425_D00052_01_M_XXEN / 03.2014
A fault at conductor L+ or L– or a symmetrical insulation fault is shown on the
display. In case of asymmetrical DC faults, a + or a - sign will be displayed in
addition to the value. Pressing the arrow up and down button allows scrolling
up and down in the display via the division of the insulation resistance up to
the percentage value.
The value range to be displayed ranges from -100 % through 0 % to +100 %:
The resistance values can be determined using the following formulas:
This could be an indication of the fault location with regard to conductor L+
or L–, also refer to the display in line 11 of the table on page 25.
It is possible to assign the detected fault resp. the faulty conductor to an alarm
relay via the menu.
If the insulation resistance exceeds the release value (response value plus hys-
teresis) the release delay toff begins. When the release delay has elapsed, the
alarm relays will switch back to their initial state and the alarm LEDs AL1/AL2
will go out. If the fault memory is activated, the alarm relays will not switch
back and the LEDs will not go out until the reset button is pressed or the sup-
ply voltage is interrupted.
The device function can be tested using the test button T. Parameters are as-
signed to the device via the LCD and the control buttons on the front panel;
this function can be password-protected. Parameterisation is also possible via
the BMS bus using the BMS Ethernet gateway, e.g. COM460IP.
Displays Meaning
–100 % one-side fault at conductor L-
0 % symmetrical fault
+100 % one-side fault at conductor L-
Fault at conductor L– RF(–) = (200 % * RF)/(100 % – R %)
Fault at conductor L+ RF(+) = (200 % * RF)/(100 % + R %)

Function
11
isoRW425_D00052_01_M_XXEN / 03.2014
3.2.1 Undervoltage/overvoltage monitoring
In the response value menu AL both parameters can be activated resp. deac-
tivated. The maximum undervoltage value is limited by the overvoltage value.
3.2.2 Connection monitoring
After connecting to the supply voltage, the following connections are
checked periodically, every 24 h (can be adjusted) or by pressing the test but-
ton T:
– Power supply connection L1(+)/L2(–)
– PE connection E/KE
In case of interruption of a connecting lead, the alarm relay K2 switches, the
LEDs
ON/AL1/AL2 flash and a fault message appears on the LC display:
E.01 = Connection fault PE
E.02 = Connection to the system incorrect
E.07 = Fault system leakage capacitance Ce> 300 µF
E.xx = Internal device error
Once the fault has been eliminated, the alarm relays will switch back to their
initial state either automatically or by pressing the reset button.
Connection monitoring can be switched off in the menu nEt, if required, see
page 45.
3.2.3 Self test, automatic
The device runs a self test after connection to the system to be monitored and
later every 24 hours (selectable: off, 1 h, 24 h). Internal malfunctions detected
during this test are shown on the display as error codes. The alarm relays are
not switched.
3.2.4 Self test, manual
The device runs a self test when the test button is pressed (> 1.5 s). Internal
malfunctions detected during this test are shown on the display as error
codes. The alarm relays are not checked (factory setting). It is possible to
change this setting to "on" in the "out" menu, also see line 26 on page 39. Con-
sequently, the alarm relays would switch during the manual self test.

Function
12 isoRW425_D00052_01_M_XXEN / 03.2014
While the internal test button T is pressed and held, all display elements avail-
able for this device are shown. During the test, the display indicates "tES".
3.2.5 Malfunction
In the event of an internal malfunction, all three LEDs will flash. An error code
will appear on the display, refer to page 53.
3.2.6 Assigning alarm categories to alarm relays K1/K2
The alarm categories device error, insulation fault, undervoltage/overvoltage
or alarm triggered by device test can be assigned to the alarm relays via the
"out" menu.
3.2.7 Time delays t, ton and toff
The times t, ton and toff, described below, delay alarm signalling via LEDs and
relays.
Start-up delay t
After connection to the supply voltage US, the alarm indication is delayed by
the preset time t (0…10 s).
Response delay ton1/2
When the value drops below or exceeds the response value, the device has a
response time tan that must have elapsed before an alarm is activated. A set
response delay ton1/2 (0…99 s) adds up to the device-related operating time
tae and delays alarm signalling (total delay time tan = tae + ton).
If the insulation fault does not continue to exist during the response delay, no
alarm will be signalled.
Delay on release toff
If the alarm no longer exists during the response delay and the fault memory
is deactivated, the alarm LEDs will go out and the alarm relays switch back to
their initial state. After activating the delay on release (0…99 s), the alarm
state is continuously maintained for the selected period. If the alarm occurs
again during the delay on release, the device remains in the alarm state.

Function
13
isoRW425_D00052_01_M_XXEN / 03.2014
3.2.8 Password protection (on, OFF)
If password protection has been activated (on), settings can only be made
subject to the correct password being entered (0…999).
3.2.9 Automatic adaptation of the pulse duration
After connection to the supply voltage, the device automatically adjusts itself
to the leakage capacitance and the insulation resistance of the system to be
monitored. This consequently determines the shortest pulse duration.
In case of system interferences, the required measuring times will be extend-
ed, capacitance measurement is also no longer possible.
3.2.10 Response time
The response time tan depends on the insulation resistance and the leakage
capacitance. If, for example, the maximum permissible leakage capacitance is
Ce= 300 µF and an insulation fault of RF= 2.5 k (Ran = 5 k) occurs in a 400-
V-DC system, the response time would be tan < 40 s.
High leakage capacitances and system interferences lead to longer response
times.
3.2.11 Factory setting FAC
Activating the factory setting will reset all modified settings, with the excep-
tion of the BMS address, to the default upon delivery.
3.2.12 External, combined test resp. reset button T/R
Reset = Pressing the external button < 1.5 s
Test = Pressing the external button > 1.5 s
3.2.13 Fault memory
It can be activated or deactivated (menu: out/M). Stored alarms can be reset
by means of the reset button R.
3.2.14 History memory HiS
The history memory provides space for exactly one data record consisting of
all current measured values. On the occurrence of the first fault, all the associ-

Function
14 isoRW425_D00052_01_M_XXEN / 03.2014
ated measured values from the fault memory are imported to the history
memory. This data can be read out using the HiS menu item. In order to be
able to record a new data record for a subsequent fault, the history memory
must first be cleared via the menu using the Clr button. Refer to the menu
item HiS starting on page 47.

15
isoRW425_D00052_01_M_XXEN / 03.2014
4. Installation, connection and commissioning
4.1 Installation
 Mounting on a DIN rail:
Snap the mounting clip at the rear of the device onto the DIN rail so
that it sits securely or
 Screw fixing:
Use a tool to position the rear mounting clips so that they project
beyond the enclosure (a second. mounting clip is required, see order-
ing information). Fix the device with two M4 screws, see the following
sketch.
Risk of electric shock!
Touching uninsulated live conductors can result in death or seri-
ous injury. Therefore avoid any physical contact with active con-
ductors and ensure compliance with the regulations for working
on electrical installations.
isoRW425 complies with the EMC limits for Class A devices in-
tended for use in industrial environments. In case of interferenc-
es, the operator may be required to take adequate counter
measures.

Installation, connection and commissioning
16 isoRW425_D00052_01_M_XXEN / 03.2014
Dimension diagram, sketch for screw mounting, push-wire terminal con-
nection:
The front plate cover can be opened at the lower part marked with an arrow.
90 mm
45
67,5
36 mm
31,1
47,5
70,5
2
2
1
2
3
100 mm
116 mm
Zubehör/
Accessory

Installation, connection and commissioning
17
isoRW425_D00052_01_M_XXEN / 03.2014
4.2 Connection
Connect the terminals A1 and A2 to the supply voltage according to
IEC 60364-4-43, i.e. the connections are to be protected against short-circuit
by means of a protective device (a 6 A fuse is recommended).
Devices for protection against short-circuit in conformity with IEC 0100-430
for the coupling of terminals 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 a test/reset button. It is not al-
lowed to use a parallel connection of several test or reset inputs for testing
multiple ISOMETER®s.
For UL application:
Only use 60/70°C copper lines!
For UL and CSA applications, it is mandatory to use 5 A fuses for the protection
of the supply voltage.

Installation, connection and commissioning
18 isoRW425_D00052_01_M_XXEN / 03.2014
Connect the device as illustrated in the wiring diagram:
US
14
24
11
T/R
A
B
L1/+
KE A1 A2
14 24 11
K1 K2
E
T/R
isoRW425
L1/+
L2/-
Test / Reset
COM460IP
on
off
L2/
RS-485
E

Installation, connection and commissioning
19
isoRW425_D00052_01_M_XXEN / 03.2014
For details about the conductor cross sections necessary for the wiring refer
to page 51.
Termi nal Connections
A1, A2
Connection to the supply voltage via fuse (line protection).
If being supplied from an IT system, both lines have to be pro-
tected by a fuse.
E, KE Connect each terminal separately to PE.
The same wire cross section as for A1, A2 is to be used.
L1/+, L2/– Connection to the AC or DC system to be monitored;
T/R Connection for the external combined test and reset button.
11, 14 Connection to alarm relay K1
11, 24 Connection to alarm relay K2
A, B
Connection RS-485 (BMS bus)
with terminating switch R (on/off)
Example: Connection of a BMS-Ethernet-Gateway COM460IP

Installation, connection and commissioning
20 isoRW425_D00052_01_M_XXEN / 03.2014
4.3 Commissioning
1. Check that the ISOMETER® is properly connected to the system to be
monitored.
2. Connect the supply voltage to the ISOMETER®.
The device carries out a calibration, a self test and adjusts itself to the IT
system to be monitored. When high system leakage capacitances are
involved, this procedure may take up about 4 minutes, then the stand-
ard display appears showing the present insulation resistance, e.g.:
The pulse symbol signals an error-free update of the resistance and
capacitance measuring values. If the measured value cannot be
updated due to disturbances, the pulse symbol will be blanked.
3. Starting a manual self test by pressing the test button "T". Whilst the
test button is pressed and held down, all display elements available for
this device are shown. When the button is released, the "tES" symbol
appears and the manual self test commences. Any internal malfunc-
tions detected are shown on the display as error codes, see page 53.
The alarm relays are not checked during this test (factory setting). The
setting can be changed in the out menu, so that the relays switch dur-
ing the manual self test.
4. Check factory setting for suitability.
Are the settings suitable for the monitored installation?
List of factory settings, see page 21.
5. Check the function using a genuine insulation fault.
Check the ISOMETER® in the system being monitored against earth, e.g.
via a suitable resistance.