Bender A-ISOMETER IR1570 Series User manual

Mit Sicherheit Spannung
Operating Manual
A-ISOMETER® IR1570
IR1575
Insulation Monitoring Device
for IT AC systems (1570)
for IT AC and IT DC systems (1575)
TGH1370en/12.2019

Dipl.-Ing. W. Bender GmbH & Co.KG
Londorfer Str. 65 • 35305 Gruenberg • Germany
P.O. Box 1161 • 35301 Gruenberg • Germany
Tel.: [phone]
Fax: [phone]
E-mail: [e-mail]
Web server: http://www.bender-de.com
© 2019 BENDER Germany
All rights reserved.
Reprinting only with permission
of the publisher.
Subject to change!

3
Table of Contents
TGH1370en/12.2019
1. Safety information .................................................................................. 5
1.1 Use for the intended purpose ............................................................................. 5
1.2 Warranty and liability ............................................................................................. 5
1.2.1 Personnel .................................................................................................................... 6
1.2.2 About the operating manual .............................................................................. 6
1.2.3 Hazards when handling the A-ISOMETER® IR157x ...................................... 6
1.2.4 Inspection, transport and storage ..................................................................... 7
1.2.5 Note .............................................................................................................................. 7
1.3 Explanations of symbols and warnings ........................................................... 7
1.4 Directions for installation ..................................................................................... 8
2. Function .................................................................................................... 9
2.1 Common characteristics (IR1570 and IR1575) .............................................. 9
2.2 Additional characteristics IR1575 ...................................................................... 9
2.3 Product description .............................................................................................. 10
2.4 Function ....................................................................................................................10
3. Commissioning flow chart .................................................................. 13
4. Connection ............................................................................................ 17
4.1 Wiring ......................................................................................................................... 17
5. Operating and setting ......................................................................... 21
5.1 Operating elements and displays IR157x ..................................................... 21
5.1.1 Display in the standard mode ........................................................................... 22
5.1.2 Display in the menu mode ................................................................................. 22
5.1.3 Function keys .......................................................................................................... 22

Table of Contents
4TGH1370en/12.2019
5.2 Menu structure ....................................................................................................... 24
5.2.1 Diagram menu structure ..................................................................................... 25
5.3 Menu ISO SETUP: Setting of the basic A-ISOMETER® functions ............ 26
5.3.1 Response values Alarm 1 and Alarm 2 ........................................................... 26
5.3.2 Operating principle of the alarm relays ......................................................... 26
5.3.3 Diagram ISO SETUP ............................................................................................... 27
5.3.4 Memory setting (on/off) ...................................................................................... 28
5.4 Menu PASSWORD .................................................................................................. 29
5.4.1 Activating and setting the password ............................................................. 29
5.4.2 Diagram PASSWORD ............................................................................................ 29
5.5 Menu LANGUAGE .................................................................................................. 30
5.5.1 Setting the national language .......................................................................... 30
5.5.2 Diagram Language ............................................................................................... 30
5.6 Menu SERVICE ......................................................................................................... 31
5.7 Menu INFO ............................................................................................................... 31
5.7.1 Diagram INFO .......................................................................................................... 31
6. Technical Data IR1570/1575 ............................................................... 33
6.1 Data in tabular form ............................................................................................. 33
6.2 Standards and approvals .................................................................................... 35
6.3 Characteristic curves ............................................................................................ 36
6.4 Dimension diagram enclosure IR157x ........................................................... 38
6.5 Ordering details ..................................................................................................... 39
6.5.1 Standard version .................................................................................................... 39
6.5.2 Label for modified versions ............................................................................... 40

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1. Safety information
1.1 Use for the intended purpose
The A-ISOMETER® is intended for:
 monitoring the insulation resistance of IT systems
Any other use, or any use which goes beyond the foregoing, is deemed to
be use other than for the intended purpose. The BENDER companies shall
not be liable for any losses or damage arising therefrom.
Use for the intended purpose also includes
 compliance with all information in the operating instructions, and
 compliance with test intervals.
As a basic principle, our "General conditions of Sale and Delivery" shall apply.
At the latest, these shall be available to the operator when the contract
is concluded.
1.2 Warranty and liability
Warranty and liability claims in cases of damage to persons and property
shall be excluded if they are attributable to one or more of the following
causes:
 Use of the A-ISOMETER® other than for the intended purpose
 Incorrect assembly or installation, commissioning, operation and mainte-
nance of the A-ISOMETER®.
 Failure to comply with the information in the operating instructions regar-
ding transport, commissioning, operation and maintenance of the
A-ISOMETER®.
 Unauthorized structural modifications to the A-ISOMETER®.
 Failure to comply with the technical data
 Improperly executed repairs, and the use spare parts or accessories which are
not recommended by the manufacturer.
 Cases of disaster and force majeure
 Assembly and installation with device combinations not recommended.

Safety information
6TGH1370en/12.2019
This operating manual, especially the safety information, must be observed above
all by personnel who work on the A-ISOMETER®.
In addition, the rules and regulations that apply for accident prevention at the
place of use must be observed.
1.2.1 Personnel
Only appropriately qualified staff may work on the A-ISOMETER®. Qualified
means familiar with the installation, commissioning and operation of the
product and with training appropriate to the work.
Personnel must have read and understood the safety section and warning informa-
tion in this operating manual.
1.2.2 About the operating manual
This operating manual has been compiled with the greatest possible care.
Nevertheless, errors and mistakes cannot be entirely ruled out. The BENDER
companies assume no liability whatsoever for any injury to persons or damage
to property which may be sustained as a result of faults or errors in this
operating manual.
1.2.3 Hazards when handling the A-ISOMETER® IR157x
The A-ISOMETER® IR157x is constructed according to the state-of-the-art and
recognized technical safety rules. Nevertheless, when it is being used, hazards
may occur to the life and limb of the user or third parties, or there may
be adverse effects on the A-ISOMETER® or on other valuable property. The
A-ISOMETER® must only be used:
 for the purpose for which it is intended
 when it is in perfect technical conditions as far as safety is concerned
Any faults which may impair safety must be eliminated immediately. Impermissible
modifications and the use of spare parts and additional devices
which are not sold or recommended by the manufacturer of the devices may
cause fires, electric shocks and injuries.
Unauthorized persons must not have access to or contact with the A-ISOMETER
®. Warning signs must always be easily legible. Damaged or illegible
signs must be replaced immediately.

Safety information
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1.2.4 Inspection, transport and storage
Inspect the dispatch packaging and equipment packaging for damage, and
compare the contents of the package with the delivery documents. In the
event of damage in transit, please inform the BENDER company immediately.
The devices must only be stored in areas protected from dust, damp and
spray or dripping water, and in which the specified storage temperatures are
maintained.
1.2.5 Note
Make sure that the operating voltage is correct!
Prior to insulation and voltage tests, the A-ISOMETER® must be disconnected
from the power system for the duration of these tests.
In order to check the proper connection of the device, it is recommended to
carry out a functional test.
Make sure that the basic settings meet the requirements of the system.
Children and unauthorized persons must not have access to or contact with
the A-ISOMETER®.
1.3 Explanations of symbols and warnings
The following symbols are used in BENDER documentation to draw attention
to important information and to make it easier to find certain text passages.
The following examples explain the meaning of the symbols:
The "Attention" symbol is used to draw attention to information
warning employees of hazardous situations.
Information you should know for correct handling of the product is
marked with the "Info" symbol.

Safety information
8TGH1370en/12.2019
1.4 Directions for installation
In order to check the proper connection of the device, it is recommended to
carry out a functional test using an insulation fault RF against earth, e.g. via
a suitable resistance, before starting the A-ISOMETER®.
The devices, variant -4.. are delivered with the following factory setting:
Please check if the basic setting of the A-ISOMETER® complies with the require-
ments of the system to be monitored.
Only one insulation monitoring device may be used in each intercon-
nected IT system.
When insulation or voltage test are to be carried out, the device shall
be isolated from the system for the test period.
The terminals and KE shall be connected by a separate wire to
the protective conductor (PE). If the terminals L1, L2 of the device are
connected to a system under operation, the terminals and KE
must not be disconnected from the protective conductor (PE).
ISO SETUP: Alarm 1 / Alarm 2 = 40 kΩ / 10 kΩ
ISO SETUP: Arbeitsweise K1/K2 = Arbeitsstromschaltung
ISO SETUP: Memory = off
To IR1575 it applies that insulation faults in DC circuits connected to
the AC system are only monitored correctly when the rectifiers carry
a continuous load of > 5…10 mA.

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2. Function
2.1 Common characteristics (IR1570 and IR1575)
 A-ISOMETER® for IT AC systems
(IT = unearthed systems)
 DC measuring principle (IR1570 only)
 Two separately adjustable ranges of the response value 2 kΩ…1 MΩ
(Alarm 1, Alarm 2)
 Two-line LC display
 Connection monitoring of the measuring leads to the IT system and to earth
 Automatic device self-test
 Option „W“:
This option provides: improved shock and vibration resistance for use in
ships, on rolling stock and in seismic environment
2.2 Additional characteristics IR1575
 A-ISOMETER® for IT AC systems with galvanically connected rectifiers and for
IT DC systems and for IT DC systems Unup to 480 V
 Automatic adaptation to the existing system leakage capacitance Ce
up to 60 µF
 AMP measuring principle (European Patent: EP 0 654 673 B1)
2.3 Product description
The A-ISOMETER® type IR157x monitors the insulation resistance of IT systems.
IR1570 is suitable for use in 3(N)AC and AC systems, IR1575 is suitable
additionally also in DC systems. In AC systems, which are monitored by
IR1575, may include extensive DC supplied loads, such as rectifiers. The device
automatically adapts itself to the existing system leakage capacitance.

Function
10 TGH1370en/12.2019
2.4 Function
The A-ISOMETER® IR157x is connected between the unearthed system and
the protective conductor (PE).
The response values and other function parameters are set via the function
keys. The parameters are indicated on the LC display and are stored in a nonvolatile
memory (EEPROM) after the setting is completed.
IR1570:
A DC measuring voltage is superimposed on the AC system to be monitored.
IR1575:
A microprocessor-controlled pulsating AC measuring voltage is superimposed
on the AC system to be monitored (AMP measuring principle, "adaptive
measuring pulse", developed by BENDER; European Patent:
EP 0 654 673 B1). The measuring cycle consists of positive and negative pulses
of the same amplitude. The period depends on the respective system leakage
capacitances and the insulation resistances of the system to be
monitored.
An insulation fault between system and earth closes the measuring circuit.
From the measured current value, the microprocessor calculates the insulation
resistance which is indicated on the LC display or the external kÙ measuring
instrument.
The measuring time is determined by the system leakage capacitances, the
insulation resistance, and the system-related interference disturbances. System
leakage capacitances do not influence the measuring accuracy.
If the reading is below the selected response values Alarm 1/Alarm 2, the associa-
ted alarm relays respond and the alarm LEDs "Alarm 1/2“ light up and
the measuring value is indicated on the LC display (in the event of DC insulation
faults, the faulty supply line is indicated). If the terminals R1/R2 are
bridged (external RESET button [NC contact] or wire bridge), the fault indication
will be stored. Pressing the RESET button, resets the fault message,
provided that the currently displayed insulation resistance is at least 25%
above the actual response value. The fault memory behaviour can also be setin the
"ISO SETUP" menu, by selecting the sub menu Memory: on/off.
By pressing the TEST button, the function of the A-ISOMETER® IR157x in
can be tested. In this way, all essential measuring functions as well as connections
to the system and to earth are checked. This self-test is automatically
carried out every 24 hours. In addition the self-test is automatically carried
out after the supply voltage has been switched on.

Function
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Self test
In order to guarantee high functional reliability, the A-ISOMETER IR157x
provides comprehensive self test functions. After switching the supply voltage
on, all internal measuring functions, the components of the process control
such as data and parameter memory as well as system and earth
connections are checked using the self test functions. The progress of the self
test is indicated on the display by a bar graph. Depending on the system condi-
tions, the self test is running 15…20 seconds, then the message "Test ok!“
appears on the LC display for approximately 2 seconds. Then the device returns
to normal measuring mode and the current measuring value is displayed
after the expiry of the measuring time.
When a fault is found, the message "!Error!" appears on the display, the system
fault LED lights up, the relay K2 (21-22-24) switches and the respective
fault message (see table) is indicated. If such a system fault occurs, a self test
is started again every minute. If no more malfunction is detected, the fault
message is deleted automatically and the system fault LED extinguishes.
During operation, the self test function can be started by pressing the TEST
button (internal or external). The alarm relays Alarm1/2 only switch after
starting the self test function by pressing the TEST button.

Function
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Reset of process control
Proceed as follows:
1. Press and hold the RESET button
2. Press and hold the MENU button
3. Press the TEST button at least for two seconds
After passing through this sequence the process control including a self-test
will be restarted.
Error message Meaning Steps to be taken
System connec-
tion?
No low-resistance
connection of ter-
minals L1, L2 to
the system
1. Check the wiring of terminal L1, L2
to the system
2. Press the test button
3. Switch the supply voltage off and
on.
4. Check the fuses
Connection PE? No low-resistance
connection of the
terminals and
KE to earth (PE)
1. Check wiring of terminal and
KE to earth (PE)
2. Press TEST button
3. Switch the supply voltage off and
on
Device error x Internal device
error
1. Press TEST button
2. Switch the supply voltage off and
on
3. Contact Bender
If the on/off switching of the supply voltage is not possible for technical
reasons, a RESET of the process control can be carried out by pressing
the "RESET“, "MENU“ and "TEST" key in a special order.

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3. Commissioning flow chart
The encircled figures in the flow chart correspond to the figures in the legend
to the wiring diagram (see page 19).
Commissioning of A-Isometer (1)
Is the system to be monitored an
unearthed system (IT system)?
The IR157x is not suitable for this
application( contact B ND R).
Device connection Optional device
connection
no
no
yes
The terminals L1 and L2 must be
connected to the system to be moni-
tored Un according to the wiring diagram .
Connect the supply voltage Us
to the terminals A0 and A1 (AC/DC 230 V)
or to the terminals A0 and A2 (AC 400 V).
Consider the details indicated on the
nameplate.
xternal T ST button (NO contact) to the
terminals T1 and T2
xternal R S T button (NC contact) to the
terminals R1 and R2
The output contacts of the alarm relays
Alarm 1 (11-12-14)
Alarm 2 (21-22-24)
9
7
8
10
Deenergize the installation
before connecting the device!
Recommended wire cross section of
connecting cable
single wire 0.2 ... 4 mm2
flexible 0.2 ... 2.5 mm2
Is the nominal voltage
Un AC 480 V (IR1570/1575) ?
oder
Un DC 480 V (IR1575) ?
yes
The two P connections and K must
be connected separately to the
equipotential bonding.
6
2
3
4
5
1
The IR157x is not suitable for this
application( contact B ND R).

Commissioning flow chart
14 TGH1370en/12.2019
Commissioning of the A-Isometer (2)
Connect the supply voltage
The A-ISOM T R carries out a
self test. The display indicates
the insulation value after finishing
the measurement.
Shall the basic setting
be changed?
Alarm1 = 40 Ohm
Alarm2 = 10 Ohm
K1/K2 = N/O operation
Memory = off
no
yes
Does one of the alarm L Ds
light up?
Select ISO SETUP
(see chapter operation and setting)
no
yes
The insulation value of the system
being monitored is below the preset
response value. Change the response
value or improve the insulation
condition of the system.
Connect the voltage of the
system to be monitored

Commissioning flow chart
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Commissioning of the A-ISOMETER (3)
In order to check the proper
connection, a functional test
using a suitable resistance is
to be carried out.
Size of the resistance:
50% of the preset response
value Alarm 2.
Check the connecting leads !
Is voltage Un applied to the
terminals L1/L2 ?
Check the voltages with a voltmeter !
yes
yes
Remove the resistor !
The IR157x is correctly
connected and functions reliably !
Do both alarm L Ds light up?
Did the alarm relays switch ?
yes
no
Do both alarm L Ds light ?
Did the alarm relays switch?
Alarm L Ds extinguished ?
Did the output relays change
their position ?
no

Commissioning flow chart
16 TGH1370en/12.2019

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4. Connection
4.1 Wiring
The A-ISOMETER® has plug-in terminals.
Connect the terminals A0/A1 and A0/A2 to the supply voltage USin accordance
with IEC 60364-4-43. The connections to the supply voltage shall be
provided with protective devices to afford protection in the event of a shortcircuit
(a 6 A fuse is recommended).
Devices for protection against short-circuit in conformity with
IEC 60364-4-43 for the IT system coupling L1/L2 can be omitted if the wiring
is carried out in such a manner as to reduce the risk of a short-circuited to a
minimum (a short-circuit-proof and earth-fault-proof wiring is recommended).
Use the accompanying terminal covers for terminal protection
Only one A-ISOMETER® may be triggered by an external TEST or RESET button.
A galvanic parallel connection of several TEST and RESET inputs for
common testing of A-ISOMETER®s is not permitted.

Connection
18 TGH1370en/12.2019
PE
Us
Un
- /~ +/~
78
910
AC 400V
L1
L2
L3
Un
3 AC - System
L2
L1
L1
L2
AC - System
L2L1
Un
Un
L1
L2
L3
3 AC - System
L2L1
N
L+
L-
DC - System
L2L1
Un
~
AC/DC 230V
AC/DC 0V
T1 T2 R1 R2 21 22 24 11 12 14
A0 A1 A2 L1 L2 KE
K1
K2
2
34
5
IR157x-435
16
IR1575

Connection
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Legend to wiring diagram:
1
Supply voltage Us(see nameplate, Technical Data on page 33 or the
ordering details) via 6 A fuse:
System connection A0/A1: AC 88…264 V, DC 77…286 V
System connection A0/A2: AC 320…480 V
2, 3
Connection of the 3AC system to be monitored:
connect terminals L1, L2 to neutral conductor N or
terminals L1, L2 to conductor L1, L2
4Connection of the DC system to be monitored (IR1575 only!):
connect terminal L1 to conductor L+, terminal L2 to conductor L-
5Connection of the AC system to be monitored:
connect terminal L1, L2 to conductor L1, L2
6Separate connection of and KE to PE
7External TEST button (NO contact)
8
External RESET button (NC contact or wire jumper),
when the terminals are open, the fault message will not be stored,
factory setting: Memory off !
9Alarm relay K2
10 Alarm relay K1
Us
-/~ +/~
AC/DC 0V
A0 A1 A2
IR157x-434
1
AC 16...72 V /
DC 10,2..84 V

Connection
20 TGH1370en/12.2019