ABB ISL-A 24 User manual

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INSTRUCTION MANUAL

ISL-A 24/ ISL-A 48

DEVICE FOR INSULATION PERMANENT CONTROL FOR ISOLATED NETWORKS (IT)

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GENERAL

In IT electrical distribution networks with isolated neutral, the high insulation impedance prevents earth faults

from generating currents that would dangerously elevate the potential of exposed conductive parts.

Therefore, in case of earth leakage in an IT network, it is not necessary to interrupt the supply, but it is still

essential to continually monitor the insulation level in order to detect faults and restore optimal functioning

of the system.

The ISL-C 230 is an Insulation Monitoring Device for IT networks with voltages of 24 to 48 V ac/dc. These de-

vices measure the potential variation of two polarities in reference to earth, to signal when the insulation is

decreasing below a fixed value.

Auxiliary supply is taken from the under-control network. On the front panel, there is signaling for the device

being ON, TEST and RESET push-buttons, and three LEDs for signaling a tripping (TRIP) and to indicate the

polarity of the line under control that has low insulation.

The threshold for trip is regulated by a series of micro-switches. There is a changeover contact relay available

to transfer the information of the low insulation signaling to a remote panel.

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INSTALLATION

The installation must be carried out by qualified and authorized personnel and in the absence of voltage.

Make sure that the instrument is O.K. and has not been damaged during transport.

Make sure that the voltage supply is compatible with the operating voltage of the instrument.

For each independent line, it's possible to use only one control device.

The device is a 3 modules (17.5mm) DIN version with snap on 35mm DIN rail.

It has a sealable transparent front protection cover.

The green LED ON will light up after the connections are set and the instrument is powered on.

DESCRIPTION

1. Green LED ON, signaling the instrument is working.

2. Red LED TRIP, signaling a trip for low insulation; in manual reset

mode, it is necessary to press the RESET to cancel the signaling.

3. Red LED TRIP (+ / -), in low insulation status, signals the polarity

under the trip threshold in a direct line, while both LEDs will be on in

an alternating line, functioning in automatic reset.

4. TEST button to test the instrument's functionality.

5. RESET button to cancel the trip signaling (manual reset).

6. Micro-switches to select the threshold for trip.

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MICRO-SWITCHES SETTING

The front micro-switches allow to set the threshold of trip between 10 and 60 kΩas it’s showed in the follow-

ing figure:

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WIRING CONNECTION

INSULATED NETWORK 24-48Vac/dc

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LEGEND

Auxiliary power supply

Terminals 1-3

The auxiliary power supply can be the same as the network to control.

Earth reference connection

Terminal 11

Connection to the earth or the protection conductor for measurement reference.

Relay output connections

Terminals 7-8-9

Changeover contact to indicate there is a fault, max 5A 250V on resistive load.

Remote TEST connection

Terminal 5

For the TEST function, it's possible to connect between this terminal and the ground (or protection conduc-

tor) a normally open contact to replicate the function of the TEST button externally to the device.

Automatic or remote RESET connection

Terminals 4-12

It’s possible to connect between these terminals a RESET button externally to the device, with a normally

closed contact to a remote reset function.

Make a short circuit between these terminals for a manual RESET with only the RESET button on the front of

the device. If the two terminals are not connected the device will operate with automatic RESET when the low

insulation condition stops.

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FUNCTIONALITY

In normal condition, with insulation value higher than the set threshold, the instrument has the green LED on.

Pressing the TEST button the TRIP LED of alarm signalling and the output relay will be activated.

Depending of the connection the RESET will be automatic when the TEST button is reIeased or using a remote

button or manual using the RESET button on the front panel.

If there is a low insulation in a direct line on + polarity (connection to terminal 1) will be activated the TRIP and

+ signalling, while the low insulation is present on the –polarity (connection to terminal 3) will be activated

the TRIP and –signalling.

In a alternate line all LED (TRIP, + and –) will be turned on.

The TRIP signalling will disappear, automatically or manually with RESET button, only when the insulation

come back higher than the set threshold, while the LED + and –work only in automatic RESET.

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TECHNICAL FEATURES

Auxiliary voltage supply

24-48V 50-60Hz/d.c. ± 20%

Maximum consumption

3 VA-3W

Measure current

max 0,5 mA

Internal impedance

50 kΩ

Threshold tripping

Settable 10 ÷ 60 kΩ(5 levels with micro-switches)

Tripping delay

About 0.2 seconds

Signalling and button

led ON, led TRIP, led +, led -

Output

Relay changeover contact NO-C-NC max 250V 5A

Working and storing temperature

-10 ÷ 60°C / -20 ÷ 70°C

Relative humidity

≤ 95 %

Insulation test

2,5 kV 60 sec. / 4 kV imp. 1,2/50μs

Mounting position

Any

Wiring type

Screw terminals / cross section cables 4 mm²

Protection degree

Front with cover: IP 40 –Enclosure: IP 20

Mounting according DIN 50022

Snap on DIN rail 35mm / 3 modules 17,5 mm

Weight

About 300 g

Standards

Safety EN 61010-1

Electromagnetic compatibility IEC-EN 61326-1

For application not described in this manual it’s better to see specific document or to contact the technical

service.

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NOTE

At reason of the evolution of standards and products, the company reserves to modify in every time the features of the product described

in this document, that it’s necessary to verify preventively.

The liability of the producer for damage caused by defect of the product ”can be reduced or deleted (…) when the damage is caused joint

by a defect of product or for blame of the damaged or a person of which the damaged is responsible” (Article 8, 85/374/CEE).

Snap on DIN rail 35mm

(DIN 50022)

3 modules 17,5 mm

DIMENSIONS

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