socomec ISOM K-20 User manual

Insulation monitoring devices
ISOM K-20
INSTALLATION AND OPERATING MANUAL EN

2EN ISOM K-20 - 551805A - SOCOMEC
1. DOCUMENTATION ...........................................................................3
2. HAZARDS AND WARNINGS ..................................................................4
2.1. Risks of electrocution, burns or explosion ....................................................4
2.2. Risks of damaging the unit .................................................................5
2.3. Responsibility ............................................................................5
3. BEFORE YOU START ........................................................................5
4. PRESENTATION .............................................................................6
4.1. About ISOM K-20 ........................................................................6
4.1.1. Range.............................................................................6
4.1.2. Principle ...........................................................................7
4.1.3. Functions ..........................................................................7
4.1.4. Electrical readings...................................................................7
4.1.5. Dimensions ........................................................................7
5. MOUNTING .................................................................................8
5.1. Recommendations and safety ..............................................................8
5.2. Installing ISOM K-20 ......................................................................8
5.2.1. Door mounted......................................................................8
5.2.2. DIN rail mounted....................................................................8
6. CONNECTIONS .............................................................................9
6.1. Connecting ISOM K-20....................................................................9
6.2. Connecting to the electrical network and circuits .............................................11
6.2.1. Description of the main network and circuit combinations ................................11
7. STATUS LEDS, BUTTONS AND AUTO-ADDRESSING ...........................................12
7.1. Status LEDs and buttons .................................................................12
7.1.1. K-20 .............................................................................12
7.1.2. Autotest ..........................................................................12
8. CONFIGURATION...........................................................................13
8.1. Configuration using Easy Config System ....................................................13
8.1.1. Connection modes .................................................................13
8.1.2. Using Easy Config System ..........................................................13
8.1.2.1. Configuring the electrical network ............................................14
8.1.2.2. Insulation ..............................................................15
8.1.2.3. Configuring alarms .......................................................16
8.2. On-screen configuration ..................................................................18
8.2.1. Navigation concept.................................................................18
8.2.2. Screen menu structure..............................................................18
8.2.3. Quick setup .......................................................................19
9. SPECIFICATIONS ...........................................................................20
9.1. ISOM K-20 specifications .................................................................20
9.1.1. Mechanical characteristics...........................................................20
9.1.2. Electrical specifications .............................................................20
9.1.3. Measurement characteristics ........................................................20
9.1.4. Input/output specifications HMI ......................................................21
9.1.5. Environmental specifications .........................................................21
9.1.6. Standards and safety ...............................................................21
9.1.7. Service life ........................................................................21
EN CONTENTS

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ISOM K-20 - 551805A - SOCOMEC
1. DOCUMENTATION
All documentation relating to ISOM K-20 and its sensors is available on the
SOCOMEC website at the following address: www.socomec.fr

4EN ISOM K-20 - 551805A - SOCOMEC
2. HAZARDS AND WARNINGS
The term "device" used in this document covers all ISOM K-20 models.
The assembly, use, servicing and maintenance of this equipment must only be carried out by trained, qualied professionals.
SOCOMEC is not responsible for any failure to follow the procedures given in these instructions.
2.1. Risks of electrocution, burns or explosion
Caution: risk of electric shock Ref. ISO 7000-0434B (2004-01)
Caution: consult the device's documentation whenever you see this
symbol. Ref. ISO 7010-W001 (2011-05)
• This device must only be installed and serviced (cleaning with a dry cloth) by qualied personnel who have in-depth
knowledge of installing, commissioning and operating the device and who have had appropriate training. He/she should
have read and understood the various safety measures and warnings stated in the instructions.
• Be aware of protection devices (insulation monitoring system), annual preventive maintenance should be carried out to
test the system's basic functions (manually activate the test function).
• Use connection cables compatible with the voltage and connection terminals of the devices.
• If, for usage reasons, the device is connected by terminals L1, L2 to a powered IT network, terminals TERRE and FE
should not be separated from the protective conductor (PE).
• Prior to any work on or in the unit, disconnect all power sources (voltage inputs, the unit's auxiliary power supply and dry
contact supplies).
• The isolation options must be:
- within the electrical installation itself
- located somewhere convenient and easily accessible
- labelled as the unit's power switching device
• These devices are designed to be integrated; they must be installed in an additional enclosure providing protection against
electric shocks and re.
• Always use an appropriate voltage detection device to conrm the absence of voltage.
• Replace all devices, doors and covers before turning on power to this equipment.
• Always power the device with the correct rated voltage.
• Install the unit following the recommended installation instructions and in a suitable electrical cabinet.
• For safety reasons, only use accessories that conform to the manufacturer's specications.
• During installation, the safety of any system integrating the device is the responsibility of the system installer.
Failure to follow these precautions could result in serious injury or death.
If there is a problem, please contact:
SOCOMEC,1 rue de Westhouse, 67235 BENFELD, FRANCE
Tel. [phone]
[email protected]

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ISOM K-20 - 551805A - SOCOMEC
2.2. Risks of damaging the unit
To ensure that the unit operates correctly, make sure that:
• The unit is correctly installed.
• The voltage of the auxiliary power supply.
• The frequency of the network shown on the device.
• There is a maximum voltage at the voltage input terminals of 480 VAC phase/phase or 277 VAC phase/neutral or 240
VDC.
• During specic checks, disconnect the devices from the network before attempting to insulate or carry out dielectric
testing.
• The devices are designed for indoor use.
• If the ambient temperature exceeds +50°C, the minimum temperature of the copper conductors to connect to terminals
should be +85°C.
Failure to respect these precautions could cause damage to the unit or cause an electrical shock.
2.3. Responsibility
• Assembly, connection and use must be carried out in accordance with the installation standards currently in force.
• The unit must be installed in accordance with the rules given in this manual.
• Failure to observe the rules for installing this unit may compromise the device's intrinsic safety.
• The unit must be positioned within an installation which complies with the standards currently in force.
• Any cable which needs to be replaced may only be replaced with a cable with the correct rating.
3. BEFORE YOU START
To ensure the safety of personnel and the device, please carefully read the contents of these instructions before installation.
Check the following points as soon as you receive the package containing the unit:
• The packaging is in good condition
• The unit has not been damaged during transportation
• The device reference number conforms to your order
• The packaging includes the device tted with removable terminal blocks and a Quick Start Guide.

6EN ISOM K-20 - 551805A - SOCOMEC
4. PRESENTATION
4.1. About ISOM K-20
ISOM K-20 monitors the insulation of the unearthed IT systems (IMD* function).
ISOM K-20 allows you to monitor the insulation of IT systems, by delivering alerts if the insulation level drops below the
thresholds set by the operator.
ISOM K-20 offers a number of options including measuring the insulation and leakage capacity.
The ISOM K-20 is congured from the display or via the Easy Cong software.
* IMD: Insulation monitoring device (product standard IEC 61557-8)
4.1.1. Range
Insulation monitoring device (IMD)
Insulation monitoring device for unearthed IT networks
ISOM K-20 AC
Auxiliary power supply Us=110-230 VAC / 120-240 VDC
Ref. 4725 0110
Insulation monitoring device for unearthed IT networks
ISOM K-20 DC
Auxiliary power supply Us=24 VDC*
Ref. 4725 0111
(*) IMPORTANT: The 24 VDC auxiliary power supply must be galvanically separated from the monitored network.

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ISOM K-20 - 551805A - SOCOMEC
4.1.2. Principle
PE
L1
L2
4.1.3. Functions
ISOM K-20 offers a number of options, including:
Insulation monitoring
• Rf, Ce measurements
• Min. Rf measurement
4.1.4. Electrical readings
ISOM K-20 AC ISOM K-20 DC
Multi-measurement
RF , Ce • •
Alarms
On set thresholds (Rf) • •
Format
Width / number of modules 96mm / 5.5 96mm / 5.5
Reference 4725 0110 4725 0111
4.1.5. Dimensions
ISOM K-20
125.6
96
91
91
96 67.6
44
17.7
47 19.7
5.9

8EN ISOM K-20 - 551805A - SOCOMEC
5. MOUNTING
The following paragraphs describe the installation of ISOM K-20.
5.1. Recommendations and safety
Refer to the safety instructions (section “2. HAZARDS AND WARNINGS”, page 4).
5.2. Installing ISOM K-20
5.2.1. Door mounted
9292
+0.8
-0
92+0.8
-0
5.2.2. DIN rail mounted
35
7.5 or 15
DIN IEC 60715

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ISOM K-20 - 551805A - SOCOMEC
6. CONNECTIONS
6.1. Connecting ISOM K-20
PE
L1
L2
0.3 Nm
Type B micro USB
4
4
12
3
5
6
x
1
AUXILIARY POWER SUPPLY
For AC version:
110-230 VAC 50/60Hz,
120-240 VDC
For DC version:
24VDC ±10%*
(*) IMPORTANT: The 24 VDC auxiliary power supply must
be galvanically separated from the monitored network. x= 10 mm
0.2 to 1.5 mm² rigid
0.2 to 2.5 mm² exible
2
CONNECTION U / PE (L1 - L2 - KE )
24-277VAC L/N
24-480VAC L/L'
24-240VDC +/-
3
FE ( )
4
2x OUTPUT RELAYS
230 VAC 3 A max
30 VDC 1 A max
5
1x INPUT (TEST/RESET)
TEST > 3s
RESET < 1s
Max. length < 3m
x= 7 mm
0.14 mm² - 1.5 mm²
6Not in use
The inputs/outputs above are dened as SELV (safety extra-low voltage): 1 (for DC model), 3, 5,.

10 EN ISOM K-20 - 551805A - SOCOMEC
IMPORTANT:
• When connecting, make sure you separate the low voltage (LV) section and the safety extra-low voltage
(SELV) section to prevent any risk of electric shock.
• Conductors should be clamped as close as possible to the terminals to avoid them detaching themselves
and reducing the insulation distances.
• The 24 VDC auxiliary power supply must be galvanically separated from the monitored network.
Description of the terminals
AUXILIARY POWER SUPPLY 1
ISOM K-20 AC (4725 0110)
110-230 VAC 50/60Hz,
120-240 VDC
ISOM K-20 DC (4725 0111)
24 Vdc ±10% galvanically separated
from the monitored network
U / PE CONNECTION 2
L1 - L2 - KE
24-277 VAC L/N
24-480 VAC L/L’
24-240 VDC +/-
FE ( ) 3
L / + N / -
N / -
L
/ +
L1
KE L2
CAT.III
1A gG / BS 88 1 A gG / T1AH300VDC
2x OUTPUT RELAYS 4
Alarm 2
22
21 24 12
11 14
Alarm 1
The relay's dry contacts should be protected with a 2A gG fuse
=> use up to 2A with resistive load.
Or T3AH250V => use up to 3A with resistive load.
It is not permitted for use on a 230VAC/30 VDC relay or a SELV signal.
You can use different phases on the2 outputrelays, but they must be from
the same three-phase network
TEST / RESET 5Connecting K-20
Dry contacts
Max. length < 3 m FE
L2L1KE
FE
L2L1KE
Not allowed Authorised

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ISOM K-20 - 551805A - SOCOMEC
6.2. Connecting to the electrical network and circuits
The insulation monitoring system ISOM K-20 is suitable for single-phase, two-phase, three-phase and DC networks.
It ensures the insulation of a complete powered IT system is monitored.
6.2.1. Description of the main network and circuit combinations
K-20
L1 L2
FE
KE
L1
3AC
L2
L3
1
DC
K-20
L1 L2
FE
L+
L-
1
KE
AC
K-20
L1 L2
FEKE
L
N
1
K-20
L1 L2
FE
3AC + N
N
L1
L2
L3
1
KE
Legend:
3
3
M
M
12 A gG

12 EN ISOM K-20 - 551805A - SOCOMEC
7. STATUS LEDS, BUTTONS AND AUTO-ADDRESSING
7.1. Status LEDs and buttons
These LEDs can be used to nd out the status of the device at any time. Use specic buttons to go straight to the devices'
main functions.
7.1.1. K-20
Power supply
(green)
Insulation alarm
ALARM 1 (amber)
Insulation alarm
ALARM 2 (amber)
Manual RESET button (short
press) / manual TEST (long
press)
"QUICK-ACCESS" button
(short-press) to scroll main
screens for Insulation, min Rf
value for alarm thresholds, leak
capacity / HOME (long-press)
to show menus
Hotkeys (3x)
OK button (short press) / Back
(long press)
LED status Constant Flashing Pulsing
ON Working 1 second at startup
ALARM 1
Presence of an alarm due to
exceeding the low threshold
ALARM1
System alarm (e.g. network
connection error)
ALARM 2
Presence of an alarm due to
exceeding the low threshold
ALARM2
System alarm (e.g. network
connection error)
7.1.2. Autotest
In order to ensure a high degree of safety when measuring the insulation and in operation, ISOM K-20 offers advanced
autotesting functions.
After powering on the devices, all their internal measurement functions as well as the data memories and connections to the
network and the PE protection conductor are tested.
You can follow the progress of the autotest option onscreen (TEST message).
You can also start the autotest at any time during use by pressing the TEST button.
The ALARM 1 and ALARM 2 signalling relays can be congured to switch if the auto-test fails.

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ISOM K-20 - 551805A - SOCOMEC
8. CONFIGURATION
Conguration can be carried out using the EasyCong software. Use the Easy Cong software to congure ISOM K-20 via
USB. To use the USB link, you must have Easy Cong installed.
8.1. Conguration using Easy Cong System
8.1.1. Connection modes
Conguration using Easy Cong System (USB)
Easy Cong System
ISOM K-20
USB cable
ref. 4829 0050
www.socomec.com/easy-cong
8.1.2. Using Easy Cong System
Easy Cong System is a conguration software used to set device parameters easily and quickly.

14 EN ISOM K-20 - 551805A - SOCOMEC
8.1.2.1. Conguring the electrical network
In the electrical network conguration menu, the user selects the type of network (three-phase, single-phase, etc.), the
nominal voltage, the network frequency.
Conguration can also be done locally from the ISOM K-20
Example: three-phase network 400VAC:
On this screen you can congure the type of IMD connection:
Three-phase or two-phase g"2P"
Single-phase g"1P+N"
Continuous g"DC"
The voltage value, as well as the rated frequency of the network (50Hz, DC…)

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ISOM K-20 - 551805A - SOCOMEC
8.1.2.2. Insulation
The "Insulation Proles" screen denes the general settings of the device:
Choosing the prole is an easy way to support the measurement algorithm on the intended application, with improved
ltering/measurement times.
You can choose between 3 proles:
• Custom
• Distribution
• Control/command

16 EN ISOM K-20 - 551805A - SOCOMEC
8.1.2.3. Conguring alarms
Insulation alert:
In this screen, you can set key information linked to the thresholds Alarm1 and Alarm2.
The Rf threshold value can be set between 1K and 1000K. You can OK a fault automatically (= "Auto") or manually with BP
RESET ("COM")

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ISOM K-20 - 551805A - SOCOMEC
System alarm:
In this screen, you can set when to activate a startup alarm in the following cases:
• Measuring failure
• voltage network outside specied range
• Device overheating
• The IMD measurement is outside the tolerance range and is not shown
• Internal device failure

18 EN ISOM K-20 - 551805A - SOCOMEC
8.2. On-screen conguration
8.2.1. Navigation concept
PARAMETERS
ISOM IMD
OK
...
LANGUAGE
OK
ISOM IMD
...
INSULATION MEASURE
RELAYS
OK
ALARMS
DIAG
...
8.2.2. Screen menu structure
ISOM IMD
Rf
Rf min
Ran
Ce
SETTINGS
Language
Isom IMD
Measuring insulation: profile, network (Un,
Fn)
Alarm: Alarm 1, Alarm 2
Relay
Password
Factory reset
Restart device
DIAG
Information
Configuration view
State I/O
Note: when you change a setting, rst conrm it by pressing "OK", then exit the menu by pressing "OK" again to make
sure your changes are saved.

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ISOM K-20 - 551805A - SOCOMEC
8.2.3. Quick setup
- 1. "QUICK-ACCESS / HOME" button: press for 3 seconds to go to settings ("HOME" screen)
- 2. "HOME" menu: go to "Settings" with the hotkey " ".
Press the hotkey "OK" to conrm.
- 3. "RESTRICTED ACCESS" menu: enter the code "1 0 0" by using the hotkeys "" and "",
then conrm with "OK".
- 4. "Language" submenu: change the language to desired one, then conrm with "OK".
- 5. "Isom IMD" submenu to go to the basic settings of the IMD
a. "Insulation measurement" submenu make your network settings (prole, network voltage,…),
press "OK" after each setting then "OK" again to exit the submenu.
b. "Alarms" submenu:
i. "Alarm 1"
"Min." to change the threshold for ALARM 1 with hotkeys "" and "" , then conrm
with "OK".
ii. "Alarm 2"
"Min." to change the threshold for ALARM 2 with hotkeys "" and "" , then conrm
with "OK".
- 6. To exit and return to the home screen, briey press "QUICK-ACCESS/HOME".

20 EN ISOM K-20 - 551805A - SOCOMEC
9. SPECIFICATIONS
9.1. ISOM K-20 specications
9.1.1. Mechanical characteristics
Casing type Modular for DIN rail and board mount
Enclosure size DIN 96x96
Casing protection index IP20
Front panel protection index /
shockproof IP40 on the nose in modular assembly / IK08
Material and flammability class of housing Polycarbonate UL94-V0
Weight 400 g
9.1.2. Electrical specications
ISOM K-20
Power supply K-20 AC AC 110-230 V 50-60 Hz / DC 120-240 V
(AC preset protection: Fuses 1A gG)
(DC preset protection: Fuses T1AH300VAC)
Power supply K-20 DC 24 VDC
(Preset protection: Fuses T1AH300VDC)
(The 24 VDC auxiliary power supply must be galvanically separated
from the monitored network)
MONITORED IT NETWORK
AC or combined AC/DC K-20: ≤ 480 VAC connection L1/L2 on phases
+/- 10%
Rated shock voltage 6 kV (IEC 60364-4-44)
CAT III
AC frequency DC, 50 to 460 Hz
Power consumption 10 VA (K-20 AC)
1.9 VA (K-20 DC)
Operating range of the voltage network +/- 10%
Rated shock voltage 6 kV (IEC60364-4-44)
9.1.3. Measurement characteristics
MEASUREMENT ACCURACY
Accuracy K-20: in accordance with IEC 61557-8
ISOM PERFORMANCE
Specific response value Ran K-20:
ALARM 1: 1 KΩ - 1 MΩ
ALARM 2: 1 KΩ - 1 MΩ
Max. leakage capacity Ce K-20: 30 µF
Specific response value uncertainty +/- 10% according to profile
Response time tan For RF = 0.5 x Ran and Ce= 1 µF: typically 4s
Measurement voltage Um 75 V depending on profile
Measurement current Im Max 1 mA
Max. external DC voltage Ufg 510 V
Measurement range Ce K-20: 0 - 30 µF