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ELKO
Monitoring relays

Monitoring relays

Product catalog summary

Company Overview: ELKO EP is a prominent European company specializing in residential and industrial electrical devices. With over 24 years of experience, it employs approximately 240 people, exports to 70 countries, and operates 13 foreign branches. The company is renowned for its Smart Home & Building Solutions, iNELS, and was awarded Company of the Year in 2012.

Product Lines:

Relays: Modular electronic devices for controlling home and office environments, including time relays and installation contactors.
iNELS RF Control: A wireless system for managing home functions such as heating and lighting.
iNELS BUS System: An intelligent system for comprehensive home automation.
Audio/Video: Products for managing music, video, and home appliances.
LOGUS90: Exclusive home switches and sockets available in various designs.
ELKO Lighting: LED light sources and complex lighting solutions.
Smart Home Kits: Starter kits for intelligent home installations.
Measuring Energy: Systems for measuring and visualizing energy consumption.

Monitoring Relays:

Voltage Monitoring Relays: Devices for monitoring single-phase and three-phase voltage, including under and over voltage relays.
Current Monitoring Relays: Devices for monitoring AC and DC current, including ground fault and reverse power relays.
Frequency Monitoring Relays: Devices for monitoring frequency and speed sensing.
Thermistor Trip: Devices for monitoring motor winding temperature.

Technical Specifications: The catalogue details specifications for various monitoring relays, including nominal voltage range, overload capacity, operating frequency, auxiliary supply voltage, relay contacts, load capacity, insulation, mechanical endurance, and environmental protection standards.

Key Features of Monitoring Relays:

Auxiliary power supply with an extended range (24—240V AC/DC).
Suitable for 50/60 Hz networks with enhanced measurement accuracy.
Designed for industrial applications with a wide range of monitored current/voltage types.
New design features include speed sensing, synchro check, and reverse power monitoring.

General Overview: The document provides technical specifications and operational guidelines for voltage monitoring relays used in electrical systems. These relays monitor voltage levels and operate relays if the voltage exceeds set thresholds. They feature LEDs for status indication and have changeover, volt-free contacts for general switching operations.

Specifications:

Voltage Monitoring: Units monitor single-phase or three-phase supplies.
Load Capacity: 250 V @ 8 A, 2 kVA for AC; 30 V 8A for DC.
Insulation: 4 kV/1 min.
Mechanical Endurance: 30 million operations.
Dimensions: 90 x 52 x 64 mm; Weight: 138 g.
Conductor Size: 2 x 1.5 mm² or 1 x 2.5 mm².
Operating Temperature: -20 to +55 °C; Storage Temperature: -30 to +70 °C.
Environmental Protection: IP40 for front panel, IP20 for terminals.
Standards: EN 60255-6, EN 60255-27, EN 61000-6-2, EN 61000-6-4.

Operational Features:

Under and Over Voltage Monitoring: Relays operate if voltage levels exceed set thresholds.
Adjustable Settings: Front panel controls for setting trip levels, nominal voltage, differential voltage, and time delay.
LED Indicators: Indicate power on, trip status, and relay operation.
Relay Contacts: Two changeover, volt-free contacts for switching operations.

Functional Modes:

Under-voltage Mode: Activates if voltage drops below set level, with delay and differential settings to prevent relay chatter.
Over-voltage Mode: Activates if voltage exceeds set level, with similar delay and differential settings.
Synchro-check Monitoring: Compares voltage, frequency, and phase angle of two supplies, operating a relay based on synchronicity.
Dead Bus Function: Activates relay if bus supply fails, allowing for emergency generator activation.

Safety and Installation:

Important safety information is provided for commissioning, operation, and maintenance.
Units are powered from a separate auxiliary supply, with green LED indicating power presence.

Device Description: The document describes voltage monitoring relays designed to monitor 3-phase 3-wire and 3-phase 4-wire supplies. These relays operate by triggering under-voltage and over-voltage conditions, with adjustable settings for trip levels, differential voltage, and time delay.

Specifications: The relays support nominal voltage ranges of 100-120 V, 173-240 V, and 380-480 V for phase-to-phase connections, and 57.7-69.3 V, 100-139 V, and 220-277 V for phase-to-neutral connections. They operate at frequencies of 45-65 Hz and require an auxiliary supply voltage of 24 V - 240 V AC/DC.

Technical Parameters: The relays have a continuous overload capacity of 100-125% Un and a 10-second maximum overload capacity of 150-180% Un. They feature a differential setting adjustable from 1-15% Un and a trip time delay adjustable from 0.5 to 10 seconds. The relay contacts are volt-free and support general switching operations with a load capacity of 250 V @ 8 A for AC and 30 V 8A for DC.

Operation Modes:

Under-voltage Mode: If the monitored voltage drops below the set under-voltage level (Umin), the Under LED lights up, and the Under relay de-energizes after a set delay. The relay re-energizes if the voltage returns above Umin plus the differential value.
Over-voltage Mode: If the monitored voltage exceeds the set over-voltage level (Umax), the Over LED lights up, and the Over relay energizes after a set delay. The relay de-energizes if the voltage falls below Umax minus the differential value.

Connection and Functionality: The relays have changeover contacts, allowing for inverted relay outputs by wiring to alternative terminals. They are powered by a separate auxiliary supply, indicated by a green LED. Under normal conditions, with all phases at nominal levels, the Under relay is energized, and the Over relay is de-energized.

Environmental and Safety Standards: The relays comply with standards EN 60255-6, EN 60255-27, EN 61000-6-2, and EN 61000-6-4. They are designed for operating temperatures between -20 to +55 °C and storage temperatures between -30 to +70 °C, with an IP40 protection rating for the front panel and IP20 for terminals.

Overview: This document provides technical specifications and operational guidelines for monitoring relays used in three-phase supply systems. These relays are designed to monitor voltage levels, phase sequence, and current levels, triggering a relay response if anomalies are detected.

Specifications:

Voltage Monitoring Relays: Available for 3-wire (VRSF3) and 4-wire (VRSF3N) systems with nominal voltages of 110V, 220V, and 430V. The relays monitor phase sequence and voltage levels, with LEDs indicating power and trip status.
Current Monitoring Relays: Models CRU1-18 and CRO1-18 monitor AC current, with adjustable trip levels and time delays. They are available for currents up to 1A and 5A, with LEDs indicating power and trip status.

Operational Procedures:

Voltage Monitoring: The relay de-energizes and the red Trip LED lights if the voltage falls below a set minimum (Umin) or if the phase sequence is incorrect. A reset occurs after the voltage exceeds Umin plus a differential, with a delay before re-energizing.
Current Monitoring: In under-current mode, the relay de-energizes if the current falls below a set level (Imin), and in over-current mode, it energizes if the current exceeds a set level (Imax). Both modes have adjustable time delays and differential settings to prevent relay chatter.

Technical Parameters:

Voltage Range: 100-120V, 173-240V, 380-480V for voltage monitoring relays.
Current Range: 1A and 5A for current monitoring relays.
Operating Frequency: 45-65 Hz.
Environmental Conditions: Operating temperature range from -20 to +55°C, storage temperature from -30 to +70°C, with IP40 protection for front panels.

Standards and Compliance: The devices comply with standards EN 60255-6, EN 60255-27, EN 61000-6-2, and EN 61000-6-4, ensuring reliability and safety in operation.

Recommendations: It is crucial to thoroughly read the safety instructions before commissioning, operating, or maintaining the units to ensure proper and safe usage.

Overview: This document provides technical specifications and operational guidelines for various types of monitoring relays, including AC current monitoring relays, ground fault monitoring relays, DC low current monitoring relays, reverse power monitoring relays, and frequency monitoring relays. Each type of relay is designed to monitor specific electrical parameters and provide protection by triggering relay responses when set thresholds are exceeded.

AC Current Monitoring Relays: These relays are used to monitor AC current levels and are powered by a separate auxiliary supply or the monitored supply. Key features include output contacts, supply voltage terminals, current monitoring terminals, and LED indicators for crossing set limits. The relays have adjustable settings for current limits (Imin and Imax) and delay times.

Ground Fault Monitoring Relays: These relays monitor leakage ground current to prevent overheating and potential device failure. They offer continuous monitoring with a short response time, adjustable current and delay settings, and options for shunt selection. The relays provide visual indications for exceeding current levels and include a RESET & TEST button for device testing.

DC Low Current Monitoring Relays: Designed to monitor DC current levels, these relays operate based on under- and over-current trip levels. They feature adjustable trip levels, time delays, and LED indicators for power and trip status. The relays are available in versions powered by 12-24V DC or 24-240V AC/DC.

Reverse Power Monitoring Relays: These relays monitor reverse power in single- or three-phase supplies to prevent generator motoring. They include controls for trip level, operating current, and delay settings, with LED indicators for power and trip status. The relays are suitable for different voltage ranges and provide protection by de-energizing the relay when reverse power is detected.

Frequency Monitoring Relays: These relays monitor the frequency of a single-phase supply and trigger a relay response if the frequency deviates from set levels. They offer adjustable settings for nominal, under-, and over-frequencies, as well as time delays. LED indicators show power and trip status, and the relays are designed to operate within specific voltage ranges.

Technical Parameters: Each relay type includes detailed technical specifications such as supply voltage, current ranges, overload capacity, response times, relay contact ratings, mechanical endurance, and environmental protection standards. The document emphasizes the importance of reading safety instructions before commissioning, operating, or maintaining the units.

Technical Specifications:

Adjustable settings: 0.5 to 5 %Fn, 0.5 to 10s
Relay contacts: 2 x changeover, volt-free, suitable for general switching operations
Load capacity: 250 V @ 8 A, 2 kVA for AC; 30 V 8A for DC
Insulation: 4 kV/1 min
Mechanical endurance: 30 million operations
Dimensions: 90 x 52 x 64 mm; Weight: 124 g approx.
Conductor size: 2 x 1.5 mm² or 1 x 2.5 mm²
Operating temperature: -20 to +55 °C; Storage temperature: -30 to +70 °C
Environmental protection: IP40 for front panel, IP20 for terminals
Standards: EN 60255-6, EN 60255-27, EN 61000-6-2, EN 61000-6-4

Functional Description:

The unit monitors AC current and operates relays if the current deviates from set levels.
Front panel controls allow selection of under- or over-current operation, current trip level, and time delay.
LEDs indicate power and trip status.
Two versions available for monitoring currents up to 1A and 5A.
Can be powered by a separate auxiliary supply or the monitored supply.

Operating Modes:

Under-current Mode: Relay energizes when current is above set level; de-energizes when below.
Over-current Mode: Relay de-energizes when current is below set level; energizes when above.

Speed Sensing Monitoring Relay:

Monitors speed using a magnetic pick-up and provides relay outputs based on speed.
Controls set trip points for crank, under-speed, and over-speed.
Calibration allows setting a standard 100% speed reference.

Temperature Monitoring:

Monitors motor temperature using PTC sensor or thermostat switch.
Relay contacts disconnect supply if motor overheats.
Front panel switches select sensor type and latching mode.

Catalog excerpts

MONITORING RELAYS TECHNICAL CATALOGUE

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The company ELKO EP has been one of the leading European players in the field of residential and industrial electrical devices for more than 24 years. Since 2007, the company has been developing and producing its own system of Smart Home & Building Solutions called iNELS. EXPORT ANNUAL TURNOVER BRANCHES OVER THE WORLD EXPORTING COUNTRIES iNELS INSTALLATION At present, ELKO EP employs nearly 240 people, exports to 70 countries around the world and already has 13 foreign branches. The company is justly proud to produce it´s own components, and to have its own development and innovation of new products....

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NEW RANGE with new solution Product Lines ELKO EP RELAYS - Modular electronic devices A wide range of electronic modular devices, which bring new possibilities to home and oﬃce control, monitoring and security, as well as to industrial process control: time relays, installation contactors, staircase automatic switches, time switches clocks, dimmers, thermostats, power supplies units, control and signalling devices,GSM gates, etc. iNELS RF Control - Wireless control A unique wireless control system providing you perfect control over your home! The RF Control system enables you to control functions...

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Catalogue content Product identification - explanation

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Overview of monitoring relays Voltage monitoring relays - single-phase Under voltage monitoring relays Over voltage monitoring relays Under and over voltage monitoring relays Synchro-check monitoring relays DC Low voltage monitoring relays Voltage monitoring relays - three-phase Under voltage monitoring relays Over voltage monitoring relays Under and over voltage monitoring relays Under voltage monitoring relays Over voltage monitoring relays Under and over voltage monitoring relays Failure and phase sequence monitoring relays Failure and phase sequence monitoring relays Phase balance and undervoltage...

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VROU1-28 | Under and over voltage monitoring relays • These units monitor a single phase supply and operate relays if the phase voltage goes below or above set levels. Front panel controls allow selection of: • Under- and Over-voltage trip levels, • nominal rated voltage, • differential voltage for operating hysteresis and • time delay before a trip triggers a relay response. • LEDs indicate power on and trip status. A relay with two changeover volt-free contacts is fitted. • These instructions contain important safety information. Please read them thoroughly before commissioning, operating or...

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VRU1-18, VRO1-18 | Voltage monitoring relays • These units monitor a single phase supply and operate relays if the phase voltage goes below or above set levels. Front panel controls allow selection of: • Under (VRU1-18)- and Over- (VRO1-18) voltage trip levels, • nominal rated voltage, • differential voltage for operating hysteresis and • time delay before a trip triggers a relay response. The time delay and differential trip levels help to prevent relay chatter as the monitored voltage level varies. As the relays have changeover contacts, the relay outputs can be inverted by wiring to the alternative...

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VRSC1-28 | Synchro-check monitoring relays • This unit compares the voltage, frequency and phase angle of two supplies and operates a relay according to the synchronicity of the supplies. If the two supplies cease to match, the relay operates to provide a control output. The relay output can be used for alarm or control purposes. • These units monitor a voltage of 50, 75 or 150 mV, e.g. from a standard current shunt, and operates one of two relays if the voltage goes above or below set levels. Front panel controls allow selection of: • under- and over-voltage trip levels Umax, Umin • nominal...

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VROU3-28 | Under and over voltage monitoring relays VRU3-18, VRU3-28 | Under voltage monitoring relays • These units monitor a 3-phase 3-wire supply and operate relays if a phase-phase voltage goes below or above set levels. Front panel controls allow selection of: • Under- and Over-voltage trip levels, • nominal rated voltage, • differential voltage for operating hysteresis and • time delay before a trip triggers a relay response. • These units monitor a 3-phase 3-wire supply and operate relays if a phase-phase voltage goes below set levels. Front panel controls allow selection of: • Under voltage...

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VRO3-18, VRO3-28 | Over voltage monitoring relays VROU3N-28 | Under and over voltage monitoring relays 19 • These units monitor a 3-phase 3-wire supply and operate relays if a phase-phase voltage goes below set levels. Front panel controls allow selection of: • Over voltage trip levels, • nominal rated voltage, • differential voltage for operating hysteresis and • time delay before a trip triggers a relay response. • LEDs indicate power on and trip status. A relay with two changeover volt-free contacts is fitted. • These instructions contain important safety information. Please read them thoroughly...

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VRU3N-18, VRU3N-28 | Under voltage monitoring relays VRO3N-18, VRO3N-28 | Overvoltage monitoring relays 21 • These units monitor a 3-phase 4-wire supply and operate relays if a phase-neutral voltage goes below set levels. Front panel controls allow selection of: • Under voltage trip levels, • nominal rated voltage, • differential voltage for operating hysteresis and • time delay before a trip triggers a relay response. • LEDs indicate power on and trip status. A relay with two changeover volt-free contacts is fitted. • These instructions contain important safety information. Please read them...

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VRSF3, VRSF3N | Failure and phase sequence monitoring relays VRSF3, VRSF3N | Failure and phase sequence monitoring relays • This unit monitors the voltage levels and phase sequence of a threephase supply and operates a relay if any phase voltage goes below a set level or if the phase sequence (L1, L2, L3) is incorrect. A front panel control allows selection of minimum voltage level. LEDs indicate power on and trip status. • Versions are available to suit 3-wire, 3ph (VRSF3) and 4-wire, 3ph+N (VRSF3N) supplies of 110V, 220V and 430V nominal. The 110V and 230V versions occupy a single module width...

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Monitoring relays

Monitoring relays

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