socomec ISOM ALD590 User manual

Operating manual
ISOM ALD590
Insulation monitoring device for IT AC and DC systems
with integrated test generator and controller for DLD46...,
DLD47... and DLD49... systems
NT 874 682 B
ISOM ALD590
Insulation Fault
Rs=011k
W .H
--- DLD: on---auto--
ADR: 02 k: 03 12 mA

SOCOMEC
1 rue de Westhouse • B.P. 10
67230 Benfeld
France
Tél. [phone]
Fax [phone]
Internet: http://www.socomec.com
E-Mail: [email protected]
Rightto modifications reserved

3
Table of Contents
NT 874 682 B
1. How to use this documentation effectively ................................. 9
1.1 Use for the intended purpose ........................................................ 9
1.2 Safety information .............................................................................. 9
1.3 Warranty andliability ..................................................................... 10
1.4 Explanations of symbols and warnings ................................... 10
2. Function ........................................................................................... 11
2.1 General characteristics ................................................................... 11
2.2 Essential functions of the ISOM .................................................. 11
2.3 Essential functions of the Insulation fault location
system (DLD) ..................................................................................... 11
2.4 Product description ........................................................................ 12
2.5 Function .............................................................................................. 12
2.5.1 Current output for external measuringinstrument ............ 13
2.5.2 Real-time clock .................................................................................. 13
2.5.3 Insulationfault location ................................................................. 14
2.5.4 Interconnected systems ................................................................ 14
2.5.5 Function input F1/F2 for connectionordisconnection
of IT systems being monitored ................................................... 14
2.5.6 ISOMnet function for central control of the insulation
monitoring process when several ALD590 are
interconnected in IT systems. ...................................................... 16
2.5.7 Self test ................................................................................................ 17
2.5.8 Relay K3: device fault alarm and DLD common message . 19
2.5.9 Factory setting .................................................................................. 19

Table of Contents
4NT 874 682 B
3. Commissioning flow chart ............................................................ 21
3.1 Commissioning of the ISOM function range (1) .................... 21
3.2 Commissioning of the insulationfault location
function (DLD) (1) ............................................................................. 23
4. Connection ....................................................................................... 27
5. Operation and setting .................................................................... 31
5.1 Operating features and displays ALD590 ................................ 31
5.1.1 Display in case of active DLD and detected fault ................. 32
5.1.2 Display in the menu mode ............................................................ 33
5.1.3 Function keys ..................................................................................... 33
5.2 Menu structure and menu mode ............................................... 36
5.2.1 Diagram menu structure ............................................................... 37
5.3 HISTORY INFO menu ....................................................................... 39
5.3.1 Diagram HISTORY INFO .................................................................. 40
5.4 ISOM SETUP menu: Setting of thebasicISOMfunctions ... 41
5.4.1 Response values Alarm 1 and Alarm 2 ...................................... 41
5.4.2 Starting the DLD system via the response values ALARM 1
and ALARM 2 ...................................................................................... 41
5.4.3 Operating principle of the alarm relays ................................... 41
5.4.4 Memory setting (on/off) ................................................................ 43
5.4.5 Current output for external measuring instruments ........... 44
5.5 ISOM ADVANCED menu: Setting of the extended
functions................................................................................................45
5.5.1 External coupling device (P: no = factory setting) .............. 45
5.5.2 Selecting the system leakage capacitance range ................. 45
5.5.3 Changing the measuring principle from AMP to DC
(Measure: AMP) ................................................................................. 45
5.5.4 Setting the repetition time for automatic self tests
(Autotest: 24h) ................................................................................... 45

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NT 874 682 B
5.5.5 Setting the real-time clock (Clock) ............................................. 45
5.5.6 Setting the date (Date) .................................................................. 45
5.5.7 Specifying the starting time of the automatic self test
(Test) ..................................................................................................... 45
5.5.8 Diagram ISOM ADVANCED ........................................................... 46
5.6 DLD-SETUP menu: Settings for fault location ........................ 47
5.6.1 DLD auto / on / off / pos / 1cycle ............................................... 47
5.6.2 Diagram DLD-SETUP ....................................................................... 48
5.6.3 System DC / 1 AC / 3 AC ................................................................. 49
5.6.4 maxPuls 1 / 2.5 / 10 / 25 / 50 mA: ............................................... 49
5.6.5 K3 alarm: ON ...................................................................................... 50
5.7 DLD460/490 menu .......................................................................... 51
5.7.1 General ................................................................................................ 51
5.7.2 Channel ............................................................................................... 51
5.7.3 Relay ..................................................................................................... 53
5.7.4 DLD Test .............................................................................................. 54
5.7.5 DLD Reset ........................................................................................... 55
5.8 DLD 470 menu .................................................................................. 56
5.8.1 DLD Monitor ...................................................................................... 56
5.8.2 DLD Test .............................................................................................. 56
5.8.3 DLD Reset ........................................................................................... 56
5.8.4 Details about the menu points Relay,Memory and n-peak56
5.8.5 Diagram DLD 470 ............................................................................. 57
5.8.6 Relay ..................................................................................................... 58
5.8.7 Memory .............................................................................................. 58
5.8.8 CT Setup: ............................................................................................. 58
5.8.9 n-peak: ................................................................................................. 60
5.9 COM SETUP menu: Setting the ISOM bus interface ............ 61
5.9.1 Bus address (Addr: ) ..................................................................... 61
5.9.2 ISOM Monitor .................................................................................... 61
5.9.3 ISOMnet ............................................................................................... 62

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6NT 874 682 B
5.9.4 Diagram COM SETUP ...................................................................... 62
5.10 PASSWORD menu ............................................................................ 63
5.10.1 Activating and setting the password ...................................... 63
5.10.2 Diagram PASSWORT ...................................................................... 63
5.11 Menu LANGUAGE ............................................................................ 64
5.11.1 Setting the national language ................................................... 64
5.11.2 Diagram Language ........................................................................ 64
5.12 Menu SERVICE .................................................................................... 65
5.13 Parameterization via Internet ...................................................... 65
6. Serial interfaces ............................................................................... 67
6.1 RS485 interface with ISOM protocol ......................................... 67
6.2 Topology RS485 network .............................................................. 68
6.2.1 Correct arrangement ...................................................................... 68
6.2.2 Wrong arrangement ........................................................................ 68
6.2.3 Wiring ................................................................................................... 68
6.3 ISOM bus protocol (ISOM) ............................................................. 69
6.3.1 ISOM Master ....................................................................................... 69
6.3.2 ISOM-Slave .......................................................................................... 70
6.3.3 ISOM operation in the Standbymode ...................................... 71
6.3.4 Combination with DLD46... devices .......................................... 72
6.3.5 Commissioning of an RS485 network with ISOM protocol 73
7. Technical data ALD590 .................................................................. 77
7.1 Data in tabular form ........................................................................ 77
7.2 Standards and approvals ............................................................... 80
7.3 Characteristic curves ....................................................................... 81
7.3.1 Characteristic curves of the ISOM ............................................... 81
7.3.2 Characteristic curves of the insulation fault evaluators
DLD46... /DLD49... ............................................................................. 84

Table of Contents
7NT 874 682 B
7.3.3 Characteristic curves for the insulation fault location
system DLD470 ................................................................................. 86
7.4 Ordering details ................................................................................ 94
7.4.1 Standard version ............................................................................... 94
7.4.2 Protection against dust andmoisture ...................................... 94
7.4.3 Measuring instruments .................................................................. 94
7.4.4 Label for modified versions .......................................................... 95

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NT 874 682 B
1. How to use this documentation effectively
This operating manual is intended to address qualified experts in electrical en-
gineering!
Note:
This manual describes an ISOM with software version 1.5
1.1 Use for the intended purpose
The ISOM is exclusively intended for:
 monitoring the insulation resistance of IT systems and
 localization of insulation faults in combination with insulation fault evalua-
tors DLD4....
Any other use, or any use which goes beyond the foregoing, is deemed to
be use other than for the intended purpose.
1.2 Safety information
General safety information
In addition to this operating manual, the documentation includes the supple-
mentary sheet „Important safety instructions for SOCOMEC Products“.
Device-specific safety information
Only one insulation monitoring device may be used in each intercon-
nectedITsystem.
Wheninsulationorvoltagetestaretobecarriedout,thedeviceshallbe
isolatedfromthesystemforthetestperiod.
Iftheterminals L1,L2,L3 ofthedeviceareconnectedto asystemunder
operation,theterminals andKEmustnotbedisconnectedfromthe
protectiveconductor(PE).

How to use this documentation effectively
10 NT 874 682 B
1.3 Warranty and liability
As a basic principle, the general conditions for the supply of products and
services of the electrical and electronics shall apply. As the latest, these shall
be available to the operator when the contract is concluded.
1.4 Explanations of symbols and warnings
The following symbols are used in SOCOMEC documentation to draw atten-
tion to important information and to make it easier to find certain text pas-
sages.
The following examples explain the meaning of the symbols:
The "Attention" symbol is used to draw attention to information war-
ningemployeesofhazardoussituations.
Informationyoushouldknowforcorrecthandlingoftheproductismar-
kedwiththe"Info"symbol.

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NT 874 682 B
2. Function
2.1 General characteristics
 Four-line LC display
 Automatic device self-test
 Memory with real-timeclocktostoreall alarm messages with date and time
stamp
 RS485 interface (ISOM protocol) for data exchange with other Socomec devi-
ces (RS485 electrically isolated)
 Remote setting of certain parameters via the Internet (option; ISOM PASS IP
additionally required)
 Option "W":
Improved shock and vibration resistancefor use in ships, on rolling stock and
inseismic environment.
2.2 Essential functions of the ISOM
 ISOM for IT AC systems with galvanically connected rectifiers and for IT DC
systems (isolated power)
 Automatic adaptation to the existing system leakage capacitances
 measuringprinciple
 Two adjustable response valuesin the range 1 kΩ... 10 MΩ(Alarm 1/Alarm 2)
 Connection monitoring
 InternaldisconnectionoftheISOMfromtheITsystemtobemonitored(using
a control signal; terminals F1/F2) , e.g. if several ISOM are interconnected.
 Current output 0(4)...20mA (galvanically separated) in relation to the measu-
red insulation value.
2.3 Essential functions of the Insulation fault location system (DLD)
 Generation of the test current necessary for selective insulation fault location
 Indication of the insulation faults selectively localized by the DLD4... systems
 ParameterizationofDLD4...systems

Function
12 NT 874 682 B
 Test function for DLD4... systems, incl. the connectedmeasuringcurrent
transfor.
2.4 Product description
The ALD590 ISOM monitors the insulation resistance of IT systems. It is sui-
table for universal use in 3(N)AC, AC/DC and DC systems. AC systems may
include extensive DC supplied loads, such as converters or thyristor-control-
led DC drives. The device automatically adapts itself to the existing system
leakage capacitance.
The ALD590 ISOM is fitted into an enclosure for panel mounting, 144 x 96
mm (WxH). For protection against dust and moisture, a panel seal (IP42) or
a front-face transparent cover (IP65) are available as accessories, see
page 90.
2.5 Function
The ALD590 ISOM is connected between the unearthed system and the pro-
tective 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 non-
volatile memory (EEPROM) after the setting is completed.
A microprocessor-controlled pulsating AC measuring voltage is superim-
posed on the system ( measuring principle*). 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 re-
sistance 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 kΩmeasuring instrument.
The measuring time is determined by the system leakage capacitances, the
insulation resistance, and the system-related interference disturbances. Sys-
tem leakage capacitances do not influence the measuring accuracy.
If the reading is below the selected response values ALARM1/ALARM2, the
WhenanACsystemincludesgalvanicallyconnectedDCcircuits,thefol-
lowingshallbeconsidered:
InsulationfaultsinDCcircuitscanonlybemonitoredcorrectlywhenthe
rectifierscarryacontinuousloadofatleast5...10mA.

Function
13
NT 874 682 B
associated alarm relays respond and the alarm LEDs "ALARM1/2" 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). The fault indication can
be stored by bridging the terminals R1/R2 (external RESET button [NC con-
tact]) or by setting the fault memory to "Memory:on" in the "ISOM SETUP"
menu.
Pressing the external or internal RESET button, resets the fault message, pro-
vided that the insulation resistance is at least 25 % above the preset value.
R1/R2 bridged + Memory:on fault memory activated
R1/R2 bridged + Memory:off fault memory activated
R1/R2 not connected + Memory:on fault memory activated
R1/R2 not connected + Memory:off fault memory deactivated
*) measuring principle "adaptive measuring pulse".
2.5.1 Current output for external measuring instrument
The current output of ALD590 provides 0(4)...20 mA. The current output is
electrically isolated from the device electronics and the RS485 interface. The
ISOM SETUP menu, on page 44, allows to switch over between 0...20 mA
and 4...20 mA.
2.5.2 Real-time clock
The real-time clock serves as a time base for the historical memory and self
test function. At first the correct time and date must be set in the menu "ISOM
ADVANCED". If time and date are not set, a "C" (clock) is flashing in the stan-
dard display. In the event of a supply voltage failure, time and date will be
stored for thirty days. If the 24 h self test is activated in the ISOM ADVANCED
menu, a special time of day can be selected for the execution of the self test
in the menu "TEST: 12:00". Then a self test will be started automatically once
a day exactly at the preset time. If the 1 h test has been selected, the self test
is automatically carried out every full hour.

Function
14 NT 874 682 B
2.5.3 Insulation fault location
Another function of the ALD590 is selective insulation fault location. If the
value of the insulation resistance falls below the set response values ALARM
1 and ALARM 2, a certain test current is generated by the ALD590. The maxi-
mum value of the test current is determined by the maxPuls parameter, see
page 49. In combination with an insulation fault evaluator DLD47...-12 and
the associated measuring current transformers connected to it, the insulation
fault is selectively detected. The detected insulation fault is signalled to the
ALD590 via the RS485 interface (ISOM bus protocol) and is then indicated
by an alarm LED and indicated on the display. In the Master mode (Addr. 1),
this alarm message is indicated by the alarm relay K3 as common alarm.
2.5.4 Interconnected systems
When using ISOM in IT systems care shall be taken that only one active ISOM
is connected in each interconnected system. If IT systems are interconnected
via coupling switches, make sure that ISOM not currently used are discon-
nected and deactivated via a control system. IT systems coupled via diodes
or capacitances may also influence the insulation monitoring process. Hence,
also in this case a central control of the different ISOM is required.
2.5.5 FunctioninputF1/F2forconnectionordisconnectionofITsystemsbeing
monitored
The ISOM can be disconnected from the IT system and set to STANDBY
mode with the function input F1/F2. When the input F1/F2 is bridged, the
terminals L1/L2 are isolated from the measuring circuit via internal coupling
relays and terminal L3 remains connected to the measuring circuit via a re-
sistor of 10 MΩ. The measuring function is stopped and the message „STAN-
DBY“ appears on the display. When using software version 1.4 or higher, the
latest measured insulation resistance is blanked and the value > 10 MΩap-
pears on the display. Furthermore, the alarm relays and alarm LEDs no lon-
ger provide alarm messages. Insulation faults already detected will be
indicated by all DLD4... devices.
After opening the function input F1/F2, first of all the connection to the IT
system will be restored and a completely new measuring cycle for insulation
In sensitive parts of the electrical installation malfunction can occur due to
thetest current flowing betweensystemandearth.Pleasenotethattheva-
lueofthetestcurrentiscompatiblewiththeelectricalinstallationbeingmo-
nitored.

Function
15
NT 874 682 B
monitoring will be started. Using this function, selective disconnection of an
ALD590 in interconnected IT systems can be carried out via auxiliary con-
tacts of the respective coupling switch. One coupling switch each in a line-
type or ring-type arrangement can deactivate a subsequent ALD590. This ar-
rangement guarantees that only one ISOM is active in each galvanically con-
nected IT system.
Theoretically speaking, in a ring-type arrangement with all coupling switches
closed, all ISOMs would be deactivated. In order to prevent this, a ISOM bus
Master (ALD590 Adr1) monitors the condition of the function input F1/F2 of
all Slave ISOMs. When all Slave ISOM are in the STANDBY mode, the insu-
lation monitoring function of the Master ISOM remains active, that means,
the input F1/F2 of the Master is without function in this mode.
Example:
Let as assume, in the before-mentioned ring-type arrangement, the associa-
ted coupling switch of the Slave ISOM 2 were open. The coupling switches
of the ISOM bus Master (Addr. 1) and of the Slaves 3 and 4 were closed. In
this case the ISOM and DLD functions of the Master and the Slaves 3 and 4
would be deactivated. In spite of changing to the STANDBY mode, the Mas-
ter status of the device with address 1 would remain. That means, if a para-
meterization is necessary, it has to be carried out via the ALD590 with ISOM
bus address 1.
Bus ISOM A/B, RS485)
F1/F2F1/F2
F1/F2F1/F2
PE PE
PE PE
IT-System 1 IT-System 2
IT-System 3IT-System 4
G
G
G
G
Adr. 1 Adr. 2
Adr. 4 Adr. 3
AL590 AL590
AL590 AL590

Function
16 NT 874 682 B
2.5.6 ISOMnetfunctionforcentralcontroloftheinsulationmonitoringprocess
when several ALD590 are interconnected in IT systems.
Up to 32 ISOM can communicate with each other in an ISOMnet network.
The ISOMnet network can only be activated when a ISOM bus is used for
interconnection. A typical method with four devices is shown as an example.
The ISOMnet function of all ISOM in the ISOMnet network must be activated
in the COM SETUP „ISOMnet=ON“ menu, refer to page 61.
The ISOM bus master (ISOM bus address 1) with activated ISOMnet function
controls the ISOMnet slave devices via the ISOM bus. When the master ISOM
has finished one measuring cycle, the authorization for insulation monitoring
is passed on to the next higher ISOM bus address. This authorization is re-
turned by the slave with the highest ISOM bus address to the ISOM bus mas-
ter after a cycle has been completed.
During the insulation monitoring process, all other ISOM, are in the STAN-
DBY mode. In this way it is prevented that ISOMs influence each other in
interconnected IT systems.
At f = 50Hz and Ce= 1µF, an ISOMnet device stays in the measuring mode
for 12s and then changes to the STANDBY mode. The maximum response
time of the ISOMnet device that made the last measurement, will be exten-
ded by the number of devices x 12s, in our example 48s.
When an insulation fault is detected by an ISOM, the insulation fault location
process is started. The device stays in the measuring mode during this time.
Only after completion of insulation fault location, the ISOMnet device stops
the monitoring mode and passes the authorization for insulation monitoring
on to the next device.
In the STANDBY mode, the ISOMnet device displays the last measured insu-
lation resistance.
Each ISOMnet slave checks the network for an ISOMnet master. If there is
no master available, the display will show the fault message
„ISOMnet Master?“ With the ISOMnet function activated, the function input
F1/F2 is automatically deactivated.
All DLD devices in the IT systems being monitored must be operated with
activated fault memory.
In comparison to a solution with coupling switches and function input F1/
F2, the response time will be extended because the measurement is not per-

Function
17
NT 874 682 B
manently carried out.
This has the advantage that no auxiliary contacts of a coupling switch are
required. Furthermore, this solution is recommended for IT systems coupled
via capacitances or diodes.
2.5.7 Self test
In order to guarantee high functional reliability, the ISOM provides compre-
hensive self test functions. After switching the supply voltage on, all internal
measuring functions, the components of the process control suchas 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 conditions, the duration of
the self test is 15... 20 seconds, then the device indicates "Test ok" for ap-
proximately 2 seconds. Then the device returns to normal measuring mode
and the current measuring value is displayed after the expiry of the reading
time.
When a fault is found the message "!Error!" appears on the display, the device
fault relay K3 (31-32-34) drops, the device fault LED lights up and the res-
pective error message (see table) is indicated. If such a device fault occurs,
Bus ISOM A/B, RS485)
PE PE
PE PE
IT-System 1 IT-System 2
IT-System 3IT-System 4
G
G
G
G
Addr. 1 Addr. 2
Addr. 4 Addr. 3
AL590 AL590
AL590 AL590

Function
18 NT 874 682 B
a self test will be started every 60 seconds. If no more malfunction is detec-
ted, the fault message will automatically be deleted, the device fault LED ex-
tinguishes and the device fault relay K3 energizes again.
During operation, the self test function can be started by pressing the TEST
button (internal or external) or automatically every hour or every 24 hours
by selecting "ISOM ADVANCED": Autotest:" in the menu. The alarm relays
ALARM 1/2 can only switch after starting the self test function by pressing
the TEST button, that means if an automatic self test has been selected, the
alarm relays do not switch.
Error message Meaning Steps to taken
Systemconnec-
tion? No low-resistance
connection of termi-
nals L1, L2, L3 to the
system
1. Check the wiring of terminal L1, L2,
L3 to the system
2. Press the TEST button
3. Switchthe supply voltageon andoff
4. Check the fuses
Connection PE? No low-resistance
connection of the ter-
minals andKEto
earth (PE)
1. Check wiring of terminal and
KE to earth (PE)
2. Press the TEST button
3. Switchthe supply voltageon andoff
Device error x Internal device error 1. Press the TEST button
2. Switchthe supply voltageon andoff
3. Please contact Socomec
Iftheon/offswitchingofthesupplyvoltageisnotpossiblefortechnical
reasons,aRESETofthedevicecanbecarriedoutbypressingthe"ESC",
"RESET"and"MENU"keysimultaneously

Function
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NT 874 682 B
2.5.8 Relay K3: device fault alarm and DLD common message
Relay K3 is intended to signal device and connection errors of the
ISOM. In the Master mode with bus address 1, DLD alarm messages can be
collectively indicated by the K3 relay as well as system fault messages. Col-
lective indication of the DLD alarms by K3 can be disabled by selecting „K3
Alarm: off“ from the "DLD Setup" menu. Refer to page 50.
K3 is permanently set to N/C operation, with the contacts 31-34 normally
closed, that means when a fault occurs, the relay deenergizes (K3: 31-32 con-
nected).
Further details are described in "chapter 2.5.7 Self test". Even when a proto-
col converter of the PASS... series is installed in a ISOM bus system which is
temporarily taking over the Master function is, the function collective DLD
message will remain. This function is directly dependent on ISOM bus ad-
dress 1, the Master status is a secondary factor.
2.5.9 Factory setting
The devices are delivered with the following factory setting:
Please check if the basic setting of the ISOM complies with the requirements
of the system to be monitored.
ISOM SETUP: Alarm 1 / Alarm 2
(response values)= 40 kΩ/ 10 kΩ
ISOM SETUP: OperatingprincipleK1/K2 = N/O operation
-------------- K3 = N/C operation (fixed setting)
ISOM SETUP: Memory = off
ISOM ADVAN-
CED: System leakage capacitance = 150 μF
DLD SETUP: DLD = auto
DLD SETUP: System = 3 AC
DLD SETUP: max. pulse = 25 mA (for DLD460/490,
DLD470)
COM SETUP: Bus address = 1 ( Master)

Function
20 NT 874 682 B