Contrel ELR-7 - User Manual

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ELR-7 manuale istruzioni / instruction manual IM205-IU v1.6 pag. 1

MANUALE ISTRUZIONI / INSTRUCTION MANUAL

IM205-IU v1.6

ELR-7 RELÈ DIFFERENZIALE DI TERRA / EARTH LEAKAGE RELAY

Relè differenziale di terra elettronico

di dimensioni compatte (esecuzione

da incasso DIN 48x48mm) con ampia

regolazione dei parametri di taratura.

Earth Leakage Relay with compact

dimensions (flush mouting DIN

48x48mm) and wide possibility of

parameters regulations.

GENERALITÀ

Il relè ELR-7 è un dispositivo differenziale che, pur

mantenendo l'ampiezza della taratura in corrente e

tempo dei relè della serie ELR e mantenendo le stesse

elevate prestazioni, è inserito in un contenitore per

montaggio da incasso DIN 48x48mm e profondità ridotta

a 72mm comprese le morsettiere.

Tutto questo permette di ridurre al minimo l’ingombro in

quelle applicazioni dove gli spazi sono limitati, come nei

quadri MCC, mantenendo prestazioni adeguate anche

alle installazioni più critiche.Risulta quindi adatto alla

protezione carichi critici, come grandi motori, ecc.

Come per tutta la gamma dei relè ELR questo modello

incorpora degli opportuni filtri sui circuiti di ingresso

rendendolo praticamente immune dai disturbi esterni ed

un'elettronica di controllo permanente dell'efficienza dei

circuiti interni e del riduttore toroidale.

Sul fronte sono programmabili la corrente di intervento

(25mA ÷ 25 A), il tempo di intervento (0,02 ÷ 5 sec.) e la

modalità di funzionamento del reset (automatico o

manuale).

Il relè ELR-7 è dotato di un microinterruttore che

permette la selezione del funzionamento del relè finale

normalmente diseccitato a riposo (condizione di non

intervento) o normalmente eccitato (sicurezza positiva o

fail safe).

Il dispositivo è inoltre dotato di due contatti in scambio

separati in uscita (ad esempio uno per la connessione

alla bobina di apertura dell’interruttore e uno per

segnalazione intervento a distanza), una apposita

calotta trasparente di protezione frontale e comode

morsettiere a vite estraibili.

GENERAL

The earth leakage relay ELR-7 is a device inserted in a

flush mounting DIN 48X48 with an extreme depth of

72mm terminals included, keeping in the same time both

the trip current and delay time adjustment amplitude of

relays series ELR keeping the same high performance.

All that allows to minimize the dimensions in all the

applications where we have place, gaps, like in MCC

electrical panel board.

As for all the ELR series this one has implemented

several filters on the input section, making it insensible

to external disturbances and also a self diagnostic check

of the internal circuits and the external toroidal current

transformer.

For all these reason it is recommended for the protection

of big motors and critical loads.

On the front label it is possible to set the tripping current

(0.025 ÷ 25A), the delay time(0,02 ÷ 5 sec.), the fail safe

and reset modality.

The device is also equipped with two change-over trip

contacts (example the first one for connection to the

shunt trip, the second for remote signalization),and also

with a plastic cover.

Another important feature is the possibility to draw-out

the terminal-board.

MODELLI DISPONIBILI

Sono disponibili due modelli che si differenziano in base

all’alimentazione ausiliaria:

- ELR-7 110-230V 50-60 Hz 110 Vcc

- ELR-7 24-48V 50-60 Hz 24-48 Vcc

- ELR-7 220Vcc

EXECUTIONS

According to the auxiliary power supply are available

two executions:

- ELR-7 110-230V 50-60 Hz 110 V dc

- ELR-7 24-48 V 50-60 Hz 24-48V dc

- ELR-7 220Vdc

Need help?

Do you have a question about the Contrel ELR-7 and is the answer not in the manual?

The ELR-7 is an electronic earth leakage relay designed for flush mounting in a DIN 48x48mm enclosure. It features compact dimensions and extensive adjustability for its operating parameters.

Function Description

The ELR-7 earth leakage relay is a protective device that maintains the broad adjustment range for current and time settings characteristic of the ELR series, while also offering high performance. Its compact design, with a depth of 72mm including terminals, allows for installation in applications with limited space, such as MCC electrical panel boards.

The relay is suitable for protecting critical loads, including large motors. It incorporates input circuit filters to minimize susceptibility to external disturbances and includes a self-diagnostic system for continuous monitoring of its internal circuits and the external toroidal current transformer.

On the front panel, users can program the tripping current (ranging from 0.025A to 25A), the delay time (from 0.02 seconds to 5 seconds), and the reset mode (automatic or manual). The device also features a microswitch that allows selection between normally de-energized (non-tripping condition) or normally energized (fail-safe) operation for the final relay.

The ELR-7 is equipped with two independent change-over output contacts. One contact can be used for connection to a shunt trip coil for circuit breaker operation, while the other can be used for remote signaling of a trip event. A transparent plastic cover provides front protection, and the device utilizes convenient plug-in screw terminals.

Important Technical Specifications

Power Supply Voltage:

110-230V 50-60Hz / 110Vdc
24-48V 50-60Hz / 24-48Vdc
220Vdc

Max Consumption: 3 VA

Tripping Current Adjustment (IΔn):

0.025 ÷ 0.25 A (for K=0.1)
0.25 ÷ 2.5 A (for K=1)
2.5 ÷ 25 A (for K=10)

Delay Time Adjustment (t):

0.02 ÷ 0.5 sec. (for K=1)
0.2 ÷ 5 sec. (for K=10)

External Toroidal Current Transformers and Accessories: CT-1 series (external multiplier setting, CT adapter)

Output Contacts: 2 change-over contacts NO-C-NC, 5A 250V resistive load

Operating Temperature: -10 ÷ 60°C

Storage Temperature: -20 ÷ 80°C

Relative Humidity: ≤ 90%

Insulation Test: 2.5 kV 60 sec.

References Standard: CEI 41-1, IEC 255, VDE 0664

Electromagnetic Compatibility: CEI-EN 50081-1, CEI-EN 50082-2

Assembly Position: Any

Type of Connection: By removable terminal strip, max 2.5 mm² cable section

Protection Class:

IP40 front with cover (optional IP55)
IP20 enclosure

Mounting: Flush mounting DIN 48x48mm, depth 72mm

Usage Features

Programming and Settings: The front panel includes several controls for setting the relay's parameters:

Tripping Current Adjustment Potentiometer: Used to set the desired tripping current (IΔn).
Delay Time Adjustment Potentiometer: Used to set the desired delay time (t).
DIP Switches for Setup:
- Switch 'a': Position 1 for automatic reset, Position 0 for manual reset.
- Switch 'b': Selects the constant for delay rating. Position 1 for K=10, Position 0 for K=1.
- Switches 'c' and 'd': Selects the constant for current rating.
  - Positions 0,0 for K=0.1
  - Position 1,0 for K=1
  - Positions 1,1 for K=10
- Switch 'e': Determines the output relay state. Position 1 for normally de-energized output relays (non-tripping condition), Position 0 for normally energized output relays (fail-safe).
Test Push-Button: For testing the relay's functionality.
Manual Reset Push-Button: For manually resetting the relay after a trip.

Indicators:

Green LED (6): Indicates auxiliary voltage supply presence.
Red LED (7): Indicates a tripped relay.

Connections:

Output Relays Terminals (8): For connecting to external devices like shunt trips or remote signaling.
Auxiliary Voltage Supply Terminals and Connection to External Toroidal Current Transformer (9): For power input and current transformer connection.

Optional Features:

3rd Harmonic Filter: An optional internal filter (approx. -22dB at 150Hz) can be added for applications on 50-60Hz lines. This version is designated with an 'h' suffix (e.g., ELR-7h).
IP55 Front Protection: A special plastic cover with a gasket can be requested to achieve IP55 front-side protection.

Accessories: The ELR-7 is compatible with accessories from the entire ELR series, such as external multipliers (CT1-M type) and adapters for connection with current transformers (e.g., .../5A).

Wiring Recommendations: For connecting the toroidal current transformer to the relay, it is recommended to use twisted pair or shielded cables to minimize interference.

Maintenance Features

The ELR-7 is designed with features that simplify maintenance and ensure reliable operation:

Self-Diagnostic Check: The device continuously monitors its internal circuits and the external toroidal current transformer, alerting users to potential issues.
Test Push-Button: Allows for quick and easy testing of the relay's tripping function, which is crucial for verifying its operational integrity without needing to simulate an actual fault.
Removable Terminal Strip: The plug-in screw terminals facilitate easy wiring and disconnection, simplifying installation and replacement procedures. This design allows for the relay to be removed or replaced without disturbing the wiring.
Transparent Front Cover: Provides protection for the settings and indicators while allowing for visual inspection of the LED status and parameter configurations.
Robust Design: Built to CEI, IEC, and VDE standards, ensuring durability and reliability in various operating environments.
Wide Operating Temperature Range: -10 to 60°C, suitable for industrial applications.
Storage Temperature Range: -20 to 80°C, allowing for storage in diverse conditions.

Contrel ELR-7 Specifications

General

Brand	Contrel
Model	ELR-7
Category	Relays
Language	English

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