AMPCONTROL ELD V3 (01) PDF Document

The safety symbols in the user manual highlight important information:

WARNING! (STOP sign): This symbol highlights a potential risk of injury or death. These warnings should be shared with other operators.

CAUTION! (Exclamation mark in triangle): This symbol highlights a potential risk of damage to equipment. These cautions should be shared with other operators.

NOTE (Pen and paper icon): This symbol highlights key information. These notes should be shared with other operators.

ENVIRO (Tree icon): The enviro (environmental) symbol highlights areas which may have an impact on the surrounding fauna and/or flora.

For safety reasons, the AMPCONTROL ELD V3 must be installed, operated, and serviced only by competent personnel. Persons responsible for installation, maintenance, or operation must observe the following instructions:

Changes to Equipment: Unauthorized changes to the hardware or operating firmware are not permitted and will void the manufacturer’s warranty and may compromise system integrity.

Equipment Knowledge: Experience with or understanding of this equipment is essential. Read and understand the manual prior to use. Competency-based training courses are recommended.

Manual Handling: Although precautions have been taken to ensure the equipment is safe to handle, care should always be taken. Gloves should be worn when handling enclosures.

Installation: Correct operation and safety depend on proper installation of the relay and associated equipment. Installation and maintenance must be carried out by appropriately qualified personnel and tested thoroughly before operation.

Operation: As safety depends on the relay functioning correctly, it is highly recommended that all safety functions of the relay be periodically tested to ensure correct operation.

Receiving:

Before accepting delivery, check all items against the packing list or bill of lading. If there is evidence of physical damage, notify Ampcontrol immediately. Also, notify Ampcontrol immediately of any discrepancies with the packing list. Keep a record of any claims and correspondence; photographs are recommended.

Inspection:

Equipment that is found to be damaged or has been modified away from its published specification must not be used. Contact Ampcontrol if the equipment is suspected to be different than ordered or if it does not match the published specifications.

Storage after Delivery:

If the equipment is not to be installed immediately, proper storage is important. All equipment should be stored indoors between 0-40°C, preferably on shelves and protected from moisture and sunlight.

The following information must be adhered to when installing the AMPCONTROL ELD V3 relay. Failure to do so may give rise to unsafe operation:

• The relay must be powered within the specified voltage range.

• The voltage and current ratings of the relay’s output contacts must be observed.

• The 4-20mA Output Signal circuit must adhere to the parameters stated in the specifications.

• The installation of the relay must be carried out by suitably trained and qualified personnel.

• Identification labels fixed to the relay must not be damaged, removed or covered before, during or after installation.

• The installation is to be in accordance with the relevant installation Standards/Codes of Practice.

• Modifications must not be made to any part of the relay. Modifications will render the unit non-compliant.

• Complete and accurate records of the installation must be kept as part of the site installation.

The AMPCONTROL ELD V3 relay is housed in a plastic and stainless steel enclosure rated as IP20. The enclosure can be either DIN rail or Panel mounted.

Panel Mounting:

The required cut out for panel mounting is 69mm (width) x 39mm (height). When panel mounted correctly using the supplied gasket, the relay will have a fascia IP rating of IP56.

DIN Rail Mounting:

A separately purchasable mounting kit (Part Number 101399) is available for mounting the relay onto a DIN rail.

To check the correct operation of the AMPCONTROL ELD V3 during commissioning, perform the following earth leakage test:

Inject a test current at 120% of the trip level setting through the toroid. Verify that the ELD V3 relay trips as expected. This test provides guidance and should be considered a minimum set of tests.

The trip settings on the AMPCONTROL ELD V3 are configured using the rotary selectors on the fascia of the relay.

• Trip Level Rotary Selector (Green): This selector configures the trip level. The trip level is the threshold of current measured by the earth leakage toroid, above which a trip occurs. It is selectable from 100mA to 2.5A.

• Trip Time Rotary Selector (Red): This selector sets the trip time. The trip time is the delay after which a fault condition has occurred when the relay will de-energise. Time delay settings are selectable from 50ms to 500ms.

*These values on the Extended Trip Level version (Part Number 179722) should not be selected when there is a requirement to comply with AS/NZS 2081.

The AMPCONTROL ELD V3 can be reset in two ways:

1. Fascia Pushbutton: Use the ‘Reset’ pushbutton on the fascia of the relay.

2. External Reset: Bridge the two RESET terminals on the relay using a normally open (NO) pushbutton or relay contact connected to the terminals labelled “Ext Reset”.

A reset will clear a latched earth leakage or CT fault trip, provided that the fault is no longer present.

To view the maximum level of leakage since the previous trip, press and hold the reset button. A section of the bar graph will slow flash (2Hz) indicating the peak level. This will continue to flash for 2 seconds after the reset button is released.

Trip LED:

• ON: Relay has tripped due to a fault condition.

• OFF: Relay is healthy.

Healthy LED:

• FLASH: Microprocessor correctly operating, ELV starting or microprocessor fault.

• OFF: Power off or microprocessor fault.

Relay LED:

• ON: Output relays are energised.

• OFF: Output relays are de-energised.

CT Fault LED:

• FLASH: Connection lost to the Earth Leakage toroid.

• OFF: EL Toroid connection is healthy.

Harmonic Trip (Har. Trip) LED:

• ON: High frequency current was measured for a period exceeding the time delay.

• OFF: High frequency currents are not being measured.

Scale LED (Bar Graph):

A series of 10 LEDs on the fascia display the earth leakage current being measured as a percentage of the trip threshold setting.

The AMPCONTROL ELD V3 continually monitors the connection to the earth leakage toroid to ensure that it has not been disconnected. If the relay fails to detect the earth leakage toroid, it will initiate and latch a CT Fault trip, which will de-energise the output relays.

To prevent a CT Fault trip, the loop resistance of the wiring between the relay and the toroid must be kept below 1Ω. A CT Fault trip can be reset using either the fascia reset pushbutton or the external reset contact.

An alternative “No CT Trip” version (Part Number 179721) is available where this detection is disabled.

Routine inspections should be carried out by suitably trained people with knowledge of the relay and its systems. These inspections can be visual-only or hands-on.

Visual Only Inspections:

This basic inspection focuses on signs of physical damage, water or dust ingress, and the condition of cables and labels. Observations would typically be:

• Check that equipment enclosures, cable trays, conduits, etc. are in good order with no physical damage.

• Check that sealed wall boxes are free from water and dust ingress internally. Door seals are in good condition.

• Check that connected cables are free from cuts, abrasions and obvious signs of damage. Cable restraints are in good order and correctly fitted.

• Check that labels on equipment, wall boxes and cables are present and in good condition (especially certification labels).

• Check that no modifications have been carried out to installed equipment.

Hands-On (Detailed) Inspections:

A more detailed inspection includes all elements of a visual inspection, plus checks on the integrity of connections, fixtures, and fittings:

• Verify that equipment housings, wall boxes and other mechanical fixtures are secured in place. This includes terminal box lids, tightness of cable glands, integrity of wall-box mountings, security of equipment fixing to walls/DIN rails etc.

• Verify all electrical connections are secure with no loose screw terminals or DIN rail terminals not fitted to rails etc.

The AMPCONTROL ELD V3 has no user-serviceable parts. All repairs must be carried out by Ampcontrol only. Do not attempt to dismantle or repair the relay as this can seriously compromise the safety of the unit and voids the product warranty.

It is recommended that the electrical protection system incorporating the ELD V3 be subject to regular functional tests at intervals determined by risk assessment or FMEA. This typically involves:

• Inject a test current at 120% of the trip level setting through the toroid. Verify that the relay trips as expected.

The following table, taken from IEC Standards, indicates the current values affecting human beings:

Toroid Selection:

i. Select the smallest internal diameter toroid which will allow the cables to fit through. Avoid very large toroids (200mm) or toroids with square apertures.

ii. The ELD has been designed for use with the Ampcontrol EL500S series of toroids.

iii. Only use approved toroids specified by Ampcontrol as these have been designed for optimum performance.

Toroid Installation Guidelines:

i. Keep cables as close to the centre of the toroid as possible. Do not tie them to one side of the toroid as this will reduce symmetry.

ii. Do not bring the cables back within a diameter distance of the toroid. This will reduce cable symmetry.

iii. Avoid placing the toroid near to any device which produces magnetic fields, for example busbars, transformers or other cables. Where possible maintain clearances in excess of several diameters distance from the toroid.

iv. Multiple small cables may present more issues than larger cables. This should be considered in circuit design.

v. Busbars cannot be passed through toroids used for core balance earth leakage protection.

vi. To prevent possible nuisance tripping it is suggested that the conductor screen of the earth leakage toroid be earthed at the relay end only. If both ends are earthed there is a possibility that the shield may become an earth loop, injecting noise into the toroid leads.

vii. To reduce noise pickup, install twisted pair cable between the protection device and the toroid.

viii. The resistance between the protection device and the toroid must be kept as low as practicable to ensure that a trip on the protection device does not occur.

CAUTION: The ELD V3 relay includes a circuit for continually testing the toroid connection. The resistance of the wiring between the relay and toroid must be kept below 1Ω. If this is not done then a “CT” fault will be detected and the relay will trip.