Ampcontrol 115161, User Manual

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Ampcontrol Electronics
ELDB006R9 ELD V2 USER MANUAL
Rev 9
– 03/14, ECN: 10573
6
ELD V2 OPERATION AND TESTING
The Ampcontrol ELD V2 Earth Leakage Relay is electronic in design and is based on microprocessor
technology. The ‘Healthy’ LED flashes to indicate correct operation of the microprocessor. The relay
uses a toroid to measure earth fault current. A definite time operating characteristic is provided with
adjustable trip sensitivity and time delay. When a fault occurs and the trip level and time delay is
exceeded the relay’s trip function is activated, which operates the trip contacts connected in the system
control circuit.
The ‘Trip’ LED is on when a trip occurs. 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. The ‘Relay’ LED is on to indicate the relay is energised.
A ten-segment LED bar graph indicates the percentage of leakage level being detected. This reading
can be remotely monitored/displayed using the 4-20mA output of the relay. When the relay measures
currents with frequencies much greater than 50Hz, the bar graph LED fast flashes (5Hz) 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 ELD V2 Earth
Leakage Relay is housed in a stainless steel case and can be either ‘DIN Rail’ or
‘Panel’ mounted through a 69 x 39mm cut out. When panel mounted the front of the ELD 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, thus inhibiting the
unauthorised removal of the front fascia cover.
An internal switch mode power supply allows the ELD to operate from 32VAC to 110VAC or 20VDC to
185VDC.
The ELD 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 20-30mA, with
instantaneous operation. (Refer AS/NZS 3190).
The ELD relay continually monitors the toroid and if the connection is lost the relay will trip and flash the
‘CT Fault’ LED.
CAUTION!
The ELD 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.
6.1 Methods of Earth Leakage Protection
The ELD V2 Relay is suitable for the two methods of protection used. They are the Core Balance and
Series Neutral earth leakage protection systems. (See Section 4.3, Methods of Earth Leakage
Protection, for details).