Ampcontrol ELM V2 User manual

Revision: 6, JULY 2023
Designed and manufactured in Australia by Ampcontrol Pty Ltd
ELM V2
EARTHLEAKAGEPROTECTIONRELAY
UserManual

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ELM V2 USER MANUAL
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WARNING!
The warning symbol highlights a potential risk of injury or death.
Please share these warnings with other operators.
CAUTION!
The caution symbol highlights a potential risk of damage to
equipment.
Please share these cautions with other operators.
NOTE
The note symbol highlights key information.
Please share these notes with other operators.
ENVIRO
The enviro (environmental) symbol highlights areas which may have an
impact on the surrounding fauna and/or flora.

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Copyright Notice
The Ampcontrol ELM V2 Earth Leakage Relay described in this document is the property of
AMPCONTROL PTY LTD. It is furnished under a license agreement and is to be used only in
accordance with the terms of the agreement.
No part of the hardware or documentation may be reproduced, transmitted, transcribed, stored in a
retrieval system, or translated into any language or computer language, in any form or by any means,
without prior written permission of AMPCONTROL PTY LTD.
Disclaimer
While every effort has been made to assure the accuracy and clarity of this document, AMPCONTROL
PTY LTD assumes no liability resulting from any omissions in this document, or from misuse of the
information obtained herein. The information in this document has been carefully checked and is
believed to be entirely reliable with all of the necessary information included. AMPCONTROL PTY LTD
reserves the right to make changes to any products described herein to improve reliability, function, or
design, and reserves the right to revise this document and make changes from time to time in content
hereof with no obligation to notify any persons of revisions or changes. AMPCONTROL PTY LTD does
not assume any liability arising out of the application or any use of any product or circuit described
herein; neither does it convey license under its patent rights or the rights of others.
Before You Begin
Thank you for purchasing the Ampcontrol ELM V2 Relay.
WARNING!
In the interests of safety and correct equipment operation, please
take the time to read and understand the content in this manual.
Ampcontrol Contact Details
7 Billbrooke Close, Cameron Park, NSW, 2285
P [phone] | F [phone]
EMAIL: [email protected]
WEB: ampcontrolgroup.com

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ELM V2 USER MANUAL
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TABLE OF CONTENTS
1 SAFETY AND OTHER WARNINGS........................................................................................................6
1.1 Safe Use of Equipment....................................................................................................................6
2 RECEIVING AND STORAGE..................................................................................................................7
2.1 Receiving.........................................................................................................................................7
2.2 Inspection.........................................................................................................................................7
2.3 Storage after Delivery......................................................................................................................7
2.4 Unpacking of Equipment..................................................................................................................7
3 PRODUCT OVERVIEW ..........................................................................................................................8
3.1 ELM V2 Earth Leakage Relay..........................................................................................................8
3.2 Accessories....................................................................................................................................10
4 INSTALLATION.....................................................................................................................................12
4.1 General Warnings..........................................................................................................................12
4.2 Mandatory Installation Practices....................................................................................................12
4.3 ELM V2 Relay Mechanical Installation Information........................................................................13
4.4 Toroid Mechanical Installation Information ....................................................................................14
4.5 Electrical Installation Information ...................................................................................................16
5 COMMISSIONING AND CALIBRATION...............................................................................................18
5.1 Earth Leakage Test........................................................................................................................18
6 PRODUCT OPERATION.......................................................................................................................19
6.1 Configuration of Trip Level and Trip Time......................................................................................19
6.2 Resetting the ELM V2 Relay..........................................................................................................20
6.3 ELM V2 Indicators..........................................................................................................................20
6.4 CT Fault Protection........................................................................................................................20
6.5 Fail Safe Operation........................................................................................................................21
7 SERVICE, MAINTENANCE & DISPOSAL ............................................................................................22
7.1 Equipment Service.........................................................................................................................22
7.2 Equipment Maintenance ................................................................................................................23
7.3 Disposal.........................................................................................................................................23
8 SPECIFICATIONS.................................................................................................................................24
9 SETTINGS QUICK REFERENCE GUIDE.............................................................................................24
10 EQUIPMENT LIST...............................................................................................................................25
10.1 Relay............................................................................................................................................25
10.2 Toroids.........................................................................................................................................25
10.3 Accessories..................................................................................................................................25
APPENDIX A: EARTH LEAKAGE PROTECTION REQUIREMENTS......................................................26
A1 Australian Standards for Earth Leakage (Mining Industry).............................................................26

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A2 Overview of Protection Problems ...................................................................................................27
A3 Earth Leakage Systems .................................................................................................................28
A4 Methods of Earth Leakage Protection ............................................................................................29
A5 Earth Leakage Toroids ...................................................................................................................29
TABLE OF FIGURES
Figure 3.1: Ampcontrol ELM V2 Earth Leakage Relay...............................................................................8
Figure 3.2: Core Balance and Series Neutral Installation Types................................................................9
Figure 3.3: DIN Rail Mounting Kit (Suit ELM / ELD / ELV) .......................................................................10
Figure 3.4: Lockable Cover (Suit ELM / ELD / ELV Relay).......................................................................10
Figure 3.5: ELCF Adaptor (Suit ELM / ELD / ELV)...................................................................................11
Figure 3.6: ELF Adaptor (Suit ELM / ELD / ELV Relay) ...........................................................................11
Figure 4.1: ELM V2 Enclosure Dimensions –Panel Mounted (Top) and DIN Rail Mounted (Bottom).....13
Figure 4.2: EL500S/25 Toroid (115438) Dimensions ...............................................................................14
Figure 4.3: EL500/60 Toroid (115439) Dimensions..................................................................................14
Figure 4.4: EL500//85 & EL500/112 Toroid Dimensions ..........................................................................15
Figure 4.5: ELM V2 Relay Typical Connection Diagram ..........................................................................16
Figure 5.1: Earth Leakage Test Circuit.....................................................................................................18
Figure 6.1: ELM V2 Fascia Operators......................................................................................................19
Figure 6.2: ELM V2 Relay Fascia Operators............................................................................................20
Figure 6.3: Functionality of ELM V2 Relay Indicator LEDs.......................................................................20

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1 SAFETY AND OTHER WARNINGS
For safety reasons, the ELM V2 Earth Leakage Relay must be installed, operated and serviced only by
competent personnel. Please read and understand this instruction manual completely before installing,
operating or servicing this equipment. Failure to install or operate this instrument in accordance with the
instructions contained in this manual may create hazardous operating conditions.
1.1 Safe Use of Equipment
The equipment supplied has been designed and manufactured to ensure safe operation. The equipment
must only be used within the design parameters.
The instructions within this manual must be observed as an aid towards achieving the safest possible
installation.
Persons responsible for installation, maintenance, or operation, must observe the following
instructions:
1.1.1 Changes to Equipment
Changes in the design and modifications to the equipment are not permitted. Unauthorised changes
made to the hardware or operating firmware will void the manufacturer's warranty, and may
compromise the integrity of the system into which it is installed and other connected equipment.
1.1.2 Equipment Knowledge
Experience with, or understanding of, this equipment is essential for the safe installation and removal of
the equipment. Therefore, please read and understand this manual prior to use. Competency based
training courses are recommended and are available on request.
1.1.3 Manual Handling
Precautions have been taken to ensure all equipment is safe to handle and free from sharp edges.
However care should always be taken when handling enclosures and gloves should be worn.
1.1.4 Installation
Correct operation and safety depend on the ELM V2 Relay and associated equipment being installed
correctly. Mechanical and or electrical installation and maintenance of plant and equipment must only
be carried out by appropriately qualified personnel and must be tested thoroughly prior to operation.
1.1.5 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.

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2 RECEIVING AND STORAGE
2.1 Receiving
All possible precautions are taken to protect the equipment against damage or losses during shipment,
however before accepting delivery, check all items against the packing list or bill of loading. If there is
evidence of physical damage, notify Ampcontrol immediately.
Notify Ampcontrol immediately in case of any discrepancies to the packing list. Keep a record of any
claims and correspondence. Photographs are recommended.
Where practicable do not remove protective covers prior to installation unless there are indications of
damage. Boxes opened for inspection and inventory should be carefully repacked to ensure protection of
the contents or else the parts should be packaged and stored in a safe place. Examine all packing
boxes, wrappings and covers for items attached to them, retain and store any approval documentation
for your safety file as applicable prior to wrapping being discarded.
2.2 Inspection
Equipment that is found to be damaged or has been modified away from its published specification must
not be used. Please contact Ampcontrol if the equipment is suspected to be different than that ordered or
if it does not match the published specifications.
2.3 Storage after Delivery
When the equipment is not to be installed immediately, proper storage is important to ensure protection
of equipment and validity of warranty.
All equipment should be stored indoors between 0-40 ˚C, preferably on shelves and protected from
moisture and sunlight.
2.4 Unpacking of Equipment
The method of packing used will depend on the size and quantity of the equipment. The following
cautions should be interpreted as appropriate.
CAUTION!
Take care when unpacking crates as the
contents may have shifted during transport.
ENVIRO
The disposal of packaging materials, replaced parts, or components
must comply with environmental restrictions without polluting the soil,
air or water.
Ensure that any timber and cardboard used as packaging is disposed
of in a safe and environmentally responsible manner.
Where possible, dispose of all waste products i.e. oils, metals, plastic
and rubber products by using an approved recycling service centre.

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3 PRODUCT OVERVIEW
3.1 ELM V2 Earth Leakage Relay
The Ampcontrol ELM V2 Earth Leakage Relay is electronic in design and is based on microprocessor
technology. The earth fault current is measured using a toroid, with the trip time and trip threshold being
able to be independently adjusted using selectors on the relay fascia.
When a fault occurs and the trip level and time delay is exceeded the relay’s trip function is activated. A
trip will de-energise the trip contacts connected in the system control circuit. The trip condition is latched
in non-volatile memory and requires operation of the reset input to clear the trip condition. An internal
reset is also provided on the fascia of the relay.
A ten-segment LED bar graph indicates the percentage of leakage level being detected. This reading
can be remotely monitored/displayed using the 4-20 mA output of the relay. When the relay measures
currents with frequencies much greater than 50 Hz, the bar graph LED fast flashes (5 Hz) instead of
being steady. Should the high frequency current persist until the time delay is exceeded the relay will trip
and the ‘Har.Trip’ LED (Harmonic Trip) will be illuminated.
The ELM V2 Earth Leakage Relay is housed in a stainless-steel case and can be either ‘DIN Rail’ or
‘Panel’ mounted through a 69 x 39 mm cut out. When panel mounted the front of the ELM V2 Earth
Leakage Relay is designed to provide IP56 ingress protection. There is provision to prevent
unauthorised adjustment of the trip settings by sealing the post (in front of the knurled nut) with a lead
seal or the use of a padlocked cover (see the equipment list for part number), thus inhibiting the
unauthorised removal of the front fascia cover.
An internal switch mode power supply allows the ELM V2 to operate from 24 VAC to 110 VAC or
24 VDC to 150 VDC.
Figure 3.1: Ampcontrol ELM V2 Earth Leakage Relay

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The ELM V2 Relay is suitable for both core balance and series neutral methods of protection.
Figure 3.2: Core Balance and Series Neutral Installation Types
The ELM V2 Relay has been designed and tested for use on fault-limited systems. To ensure maximum
protection the earth leakage system should be used in conjunction with the other protection systems
covered by AS/NZS 2081. The collective systems are designed to limit touch and step potentials.
The relay is also suitable for industry where equipment or system earth leakage protection is required.
The relay is not suitable for personal protection, which requires trip levels of 20-30 mA, with
instantaneous operation (refer to AS/NZS 3190).
The ELM V2 Relay continually monitors the toroid and if the connection is lost the relay will trip and flash
the ‘CT Fault’ LED.
A B C
A B C
To Supply
To Load
N
NER
To Supply Neutral
To NER
Core Balance Installation Series Neutral Installation
EL500S
Toroid EL500S
Toroid

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3.2 Accessories
3.2.1 DIN Rail Mounting Kit (Part Number 101399)
The ELM V2 Relay is designed to be panel mounted, however a DIN rail mounting kit can be
separately purchased.
Figure 3.3: DIN Rail Mounting Kit (Suit ELM / ELD / ELV)
3.2.2 Lockable Cover (Part Number 164672)
A separately purchasable Lockable Cover is available to install over the fascia of the ELM V2 Relay.
This can be used to prevent earth leakage resets being performed by unauthorised personnel.
Figure 3.4: Lockable Cover (Suit ELM / ELD / ELV Relay)

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3.2.3 ELCF Adaptor (Part Number 120255)
This accessory allows users of the obsolete ELCF Earth Leakage Relay to upgrade to Ampcontrol’s
next generation of earth leakage relays. The ELCF Adaptor seals the larger hole left by the ELCF
Relay and provides a mounting point for the ELM V2 Relay.
Figure 3.5: ELCF Adaptor (Suit ELM / ELD / ELV Relay)
3.2.4 ELD / ELV / ELM Service Kit (Part Number 179513)
This kit includes all loose components used in the ELD / ELV / ELM Relays.
•1x Clear Front Window Cover
•2x Window Thumb Nuts
•2x Mounting Clips with Screws
•1x Facia Gasket
3.2.5 BRAMCO ELF Adaptor (Part Number 175279)
This adaptor kit allows users of the BRAMCO ELF and ELF2 Relays to transfer to Ampcontrol’s next
generation of earth leakage relays. The ELF Adaptor seals the larger hole (90 x 90 mm) left by the ELF
Relay and provides a mounting point for the ELM V2 Relay.
Figure 3.6: ELF Adaptor (Suit ELM / ELD / ELV Relay)

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4 INSTALLATION
4.1 General Warnings
These instructions have been designed to assist users of the ELM V2 Relay with installation.
Before the ELM V2 Relay can be installed, there are a number of things that need to be considered and
understood to prevent incorrect or unsafe operation of the relay or the system into which it is installed.
Along with relevant competence, and an understanding of the target application, the following points
should be considered:
4.1.1 Ensure that the information provided in this user manual is fully understood.
It is extremely important that the limitations and functionality of the ELM V2 Relay are understood to
prevent incorrect installation and use from creating a potentially dangerous risk. If in doubt as to the
nature of the limitations or their implication, consult a competent authority such as a supervisor or
Ampcontrol technical representative.
4.1.2 Ensure that the application into which the ELM V2 Relay is being installed has
been properly defined, designed and approved.
Any system intended to mitigate the risk of injury needs to be properly designed and implemented. Such
a system must be the result of structured risk analysis with the outcomes used to define the system
requirements. These requirements, in turn, will guide the choice of instrumentation, logic solvers and
actuators needed to implement the system. Understanding the needs of the system will ensure proper
selection of equipment.
4.1.3 Ensure that the ELM V2 Relay will properly perform the required functions within
the system design.
It is important to understand how the ELM V2 Relay is intended to interact with other equipment within a
system. For safe and reliable use, it is crucial that neither the ELM V2 logical operation nor its signalling
be compromised by incompatibilities with connected equipment.
4.1.4 Modifications of any form to the ELM V2 Relay are prohibited.
The ELM V2 Relay as supplied has been designed and manufactured to comply with the requirements of
protection standards. If modifications of any form are made to the ELM V2 Relay, the equipment may no
longer be fit for use. If any modifications or damage to the ELM V2 Relay is evident, do not use the
equipment and contact Ampcontrol for advice.
4.2 Mandatory Installation Practices
The following information must be adhered to when installing the ELM V2 Relay. Failure to adhere to this
information may give rise to unsafe operation.
Using the ELM V2 Relay in a manner that exceeds its electrical, functional or physical specifications, or
in a way that is contrary to its operating restrictions, may create risks to personnel and/or equipment
resulting in injury or death.
•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

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•Modifications must not be made to any part of the relay. As supplied, the unit is built to, and
complies with the relevant standards. Modifications to its construction will render the unit non-
compliant
•Complete and accurate records of the installation must be kept as part of the site installation
4.3 ELM V2 Relay Mechanical Installation Information
The ELM V2 Relay is housed in a plastic and stainless steel enclosure and is rated as IP20. The ELM V2
Relay enclosure is designed to be either DIN rail or Panel mounted. The dimensions are shown in Figure
4.1 below.
Figure 4.1: ELM V2 Enclosure Dimensions –Panel Mounted (Top) and DIN Rail Mounted (Bottom)
4.3.1 Panel Mounting
The required cut out for panel mounting is 69 w x 39 h (mm).
When panel mounted correctly using the supplied gasket, the ELM V2 Relay will have a fascia IP rating
of IP56.
4.3.2 DIN Rail Mounting
A separately purchasable mounting kit is available for mounting the ELM V2 Relay onto a DIN rail. See
the equipment list in Section 10.

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4.4 Toroid Mechanical Installation Information
The ELM V2 Relay uses the EL500 100:1 toroid range for earth leakage current detection. These toroids
are available in alternative sizes. These allow trip settings from 30 mA to 2.5 A.
The toroids specified for the more advanced ELD V3 and ELV Relay products meet the performance
required by the ELM V2 Relay and can be used as alternative toroid options. For further information on
these toroids see appropriate relay documentation.
4.4.1 EL500S/25 (Part Number 115438)
The EL500S/25 toroid has a 25 mm window and is DIN rail mounted.
Figure 4.2: EL500S/25 Toroid (115438) Dimensions
4.4.2 EL500/60 (Part Number 115439)
The EL500/60 toroid has a 60 mm window and is panel mounted.
Figure 4.3: EL500/60 Toroid (115439) Dimensions

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4.4.1 EL500/85 (Part Number 115440) & EL500/112 (Part Number 115441)
The EL500/85 and EL500/112 toroids have a 85 mm and 112 mm window respectively and is panel
mounted.
Figure 4.4: EL500//85 & EL500/112 Toroid Dimensions

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4.5 Electrical Installation Information
Non Fail Safe Link
ELM V2
10 NC-2
9COM-2
8NO-2
COM-1
NO-1
PWR2
PWR1
EARTH
CT-COM
CT-SIG
4-20mA +
18
4-20mA -
RESET +
RESET -
NON-FS1
NON-FS2
LINK-3
LINK-2
LINK-1
13
12
11
External Reset
Pushbutton
17
16
+
_10-30Vdc
19
Analogue Input
Device
To Main Contactor
Tripping Circuit
To Indication
Circuit
7
6
5
4
24-110Vac
To Load
Main
Contactor
3
EL Test
Circuit 2
1
Alternative
Toroid Position
PWR2
PWR1
Alternative
Power Supply
5
4
24-168Vdc
-
+
Loop Resistance < 1Ω
Toroidal Current
Transformer
Incoming
Supply
NOT USED
NOT USED
NOT USED
15
14
Figure 4.5: ELM V2 Relay Typical Connection Diagram
4.5.1 CT-SIG & CT-COM Connections (Terminals 1 & 2)
These terminals are for the earth leakage toroid connection.
CAUTION!
The wires connecting the ELM V2 Relay and the earth leakage toroid
should be run in a twisted pair and must have a loop resistance of
less than 1Ω.
4.5.2 Earth Connection (Terminal 3)
This terminal is for the connection of the power supply earth.
4.5.3 PWR1 & PWR2 Connections (Terminals 4 & 5)
These terminals are for the connection of the control power supply.
The relay is able to operate across both AC and DC voltages ranges. The supply voltage can be 24-
110 VAC +/- 20 % at 50 Hz, or 24-168 VDC +/- 10 %.
4.5.4 NO-1 & COM-1 Connections (Terminals 6 & 7)
These terminals provide a normally open contact that can be wired into control or indication circuits.
The output relay will be energised (closed) whilst the ELM V2 Relay is healthy and will de-energise
when the ELM V2 Relay is in the tripped state.

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4.5.5 NO-2, COM-2 & NC-2 Connections (Terminals 8, 9 & 10)
These terminals provide a changeover contact that can be wired into control or indication circuits.
The output relay will be energised whilst the ELM V2 Relay is healthy and will de-energise when in the
ELM V2 Relay is tripped state.
4.5.6 LINK-1, LINK-2 & LINK-3 Connections (Terminals 11, 12 & 13)
These terminals are not used and are not to be connected.
4.5.7 NON-FS1 & NON-FS2 Connections (Terminals 14 & 15)
These terminals are used to change the ELM V2 Relay between Fail-safe and Non-Fail-Safe modes of
operation by shorting these two terminals.
4.5.8 RESET- & RESET+ Connections (Terminals 16 & 17)
These terminals are for the connection of the external reset pushbutton.
If an external reset is used, it is recommended that a twisted pair be used between the N/O contact and
the reset input.
4.5.9 4-20 mA- & 4-20 mA+ Connections (Terminals 18 & 19)
These terminals provide a 4-20 mA analogue output that indicates the earth leakage current as a
percentage of the trip level.
The current output of 4mA represents an earth leakage current of 0 % of the trip level (no earth
leakage) and the current output of 20 mA represents an earth leakage current of 120 % of the trip level.
At 100 % the current will be 17.33 mA.
Maximum Loop Resistance = [Vs*-10] x 50,
*where Vs must be greater than 10 VDC and less than 30 VDC
The 4-20 mA output should be wired as per Figure 4.5.
NOTE
Ampcontrol does not recommend using the 4-20 mA output as the main
tripping signal. All tripping should be carried out by the provided output
relays.

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5 COMMISSIONING AND CALIBRATION
Prior to being put into service, the electrical protection system must be correctly commissioned. This
manual does not cover system commissioning; the full scope of commissioning tests should be
determined during the risk assessment or FMEA covering the design of the electrical protection system.
The following test can provide guidance on checking the correct operation of the ELM V2 Relay during
commissioning. This is not intended to provide an exhaustive commissioning checklist, but should be
considered to be a minimum set of tests.
5.1 Earth Leakage Test
Inject a test current at 120 % of the trip level setting through the toroid, as shown in Figure 5.1. Verify
that the ELM V2 Relay trips as expected.
Non Fail Safe Link
(NOT USED)
ELM V2
10 NC-2
9COM-2
8NO-2
COM-1
NO-1
PWR2
PWR1
EARTH
CT-COM
CT-SIG
4-20mA +
18
4-20mA -
RESET +
RESET -
15
NON-FS1
14
NON-FS2
LINK-3
LINK-2
LINK-1
13
12
11
External Reset
Pushbutton
17
16
+
_10-30Vdc
19
Analogue Input
Device
To Main Contactor
Tripping Circuit
To Indication
Circuit
7
6
5
4
24-110Vac
To Load
Main
Contactor
3
EL Test
Circuit 2
1
Alternative
Toroid Position
PWR2
PWR1
Alternative
Power Supply
5
4
24-168Vdc
-
+
Loop Resistance < 1Ω
Toroidal Current
Transformer
Incoming
Supply
NOT USED
NOT USED
NOT USED
Figure 5.1: Earth Leakage Test Circuit

Ampcontrol Pty Ltd –ABN 28 000 915 542
ELM V2 USER MANUAL
MAG-231 Revision 6 –JULY 2023
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 19 of 30
APPROVED FOR EXTERNAL DISTRIBUTION –PROPERTY OF AMPCONTROL PTY LTD –NOT TO BE REPRODUCED IN PART
6 PRODUCT OPERATION
The following subsections will detail the operation of the ELM V2 Relay. This includes the operation of
the earth leakage protection, rotary switches, output relays and indication LEDs.
6.1 Configuration of Trip Level and Trip Time
Figure 6.1: ELM V2 Fascia Operators
The trip settings are configured using the rotary selectors on the fascia of the ELM V2 Relay. The trip
level is configured using the left rotary selector (typically green) and the trip time is selected using the
right rotary selector (typically red).
NOTE: Dial colour may vary or match due to supply issues, as such the dial name should always be
verified.
The trip level represents the threshold of current measured by the earth leakage toroid, above which a
trip occurs. The trip level is selectable from 100 mA to 2.5 A.
The trip time represents the delay after which a fault condition has occurred when the ELM V2 Relay will
de-energise. Time Delay settings are selectable from 50 ms to 3000 ms.
Trip Level Rotary Selector
Trip Time Rotary Selector
Switch Position
Trip Level (mA)
±10 %
Switch Position
Time Delay (ms)
0
100
0
50
1
150
1
100
2
200
2
150
3
250
3
200
4
300
4
250
5
350
5
300
6
400
6
350
7
450
7
400
8
500
8
450
9
750
9
500
A
1000
A
750
B
1250
B
1000
C
1500
C
1500
D
1750
D
2000
E
2000
E
2500
F
2500
F
3000
Table 6.1: Trip Level and Trip Time Settings

Ampcontrol Pty Ltd –ABN 28 000 915 542
ELM V2 USER MANUAL
MAG-231 Revision 6 –JULY 2023
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 20 of 30
APPROVED FOR EXTERNAL DISTRIBUTION –PROPERTY OF AMPCONTROL PTY LTD –NOT TO BE REPRODUCED IN PART
6.2 Resetting the ELM V2 Relay
Figure 6.2: ELM V2 Relay Fascia Operators
The ELM V2 Relay can be reset using the pushbutton on the fascia of the relay, or by bridging the two
RESET terminals on the relay using a normally open (NO) pushbutton or relay contact connected to the
terminals labelled “Ext Reset” (see Figure 4.5 for connection information).
Initiating a reset will clear a latched earth leakage or CT fault trip, provided that these faults are not still
present or have been cleared.
The reset button is also used to access the memory of the processor to view the maximum level of
leakage since the previous trip. A section of the bar graph will slow flash (2 Hz) indicating the peak level
while the reset button is held closed, and will continue to flash for 2 second after the reset button is
released.
6.3 ELM V2 Indicators
Figure 6.3: Functionality of ELM V2 Relay Indicator LEDs
6.4 CT Fault Protection
The ELM V2 Relay 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.
A CT Fault trip can be reset using either the fascia reset pushbutton or the external reset contact.
CAUTION!
The loop impedance of the connection to the earth leakage toroid is
continually monitored by the ELM V2 Relay. To prevent a CT Fault trip,
the loop resistance of the wiring between the relay and the toroid
must be kept below 1Ω.