MerCs ME-ELR-DD Manuel utilisateur

02 4047 0777 www.mercs.com.au02 4047 0788

MerCs Pty Ltd, 55 Pendlebury Rd, Cardi, NSW, 2285, Australia | 2018 V1.1

Earth Leakage Relay

User Manual

ME-ELR-DD

• Adjustable sensitivity

• Adjustable time delay

• LED Status indicators

• Leakage current indication

• Remote test and reset switching

• DIN rail mounting

• Current measurement based on fundamental frequency, prevents nuisance tripping

• Dial adjustment for ease of use

• Robust casing protects the unit from external interference

• Serial Number Tracked

Features

The ME-ELR-DD are microprocessors based earth leakage relays designed for measure the

low-level leakage or unbalanced currents due to insulation loss in conductors or equipment to be

protected. A zero phase current transformer is used to sense the leakage current. All conductors

of the circuit to be protected shall go through the ME-T.

For better fault preventive control of the system or equipment, ME-ELR-DD comes with a pre-

fault alarm contact and a positive safety contact. The pre-fault alarm contact is energized when-

ever the leakage current exceed 50% of the sensitivity setting, I n. The positive safety contact is

energized if the relay is power up and function correctly.

DescriptionApplications

Technical Data

• Industrial equipment protection

• Personnel protection from Earth Leakage

faults

• Suitable for low voltage distribution

protection

Auxiliary Supply

ME-ELR-DD-110A 94 ~ 127 VAC

ME-ELR-DD-24A 21 ~ 28 VDC

Rated frequency 50Hz

VA rating 3 VA typical

Setting Ranges

Sensitivity adjustment

30mA, 50mA,

0.10A – 1.00A (Step = 50mA),

1.00A – 5.0A (Step = 1.00A)

Delay time adjustment 0.05s - 0.5s (Step = 0.05s)

Record

Fault record 3 latest tripped fault currents

Storage Non-volatile memory

Input

Remote reset N.O. dry contact

Outputs

Trip contact 5A / 250V AC1

Positive safety contact 5A / 250V AC1

Pre-fault alarm contact 5A / 250V AC1

Contact Specication

Contact arrangement 3 latest tripped fault currents

Contact material Non-volatile memory

Expected electrical life 100,000 at rated current

Expected mechanical life 5x106operations

02 4047 0777 www.mercs.com.au02 4047 0788

MerCs Pty Ltd, 55 Pendlebury Rd, Cardi, NSW, 2285, Australia | 2020 V1.1

Earth Leakage Relay ME-ELR-DD

Indicator Status

Trip Alarm FUNC DP DATA

0 0 0 0 0 No auxiliary power supply

0 0 0 0 1 Normal condition, no tripping

0 B X X X Leakage current exceeded 50% of the sensitivity

setting, I△n

0 FB X X X Leakage current exceeded 85% of the sensitivity

setting, I△n. Time delay countdown started

1 1 0 0 B Delay time lapsed and relay tripped

0 X 1 0 1 Scroll through setting

0 X 1 1 1 Scroll through records

0 X B 0 1 Programming mode

Light Indicators

The indicators display the status of the system as follow:

Indicators

Pre-fault alarm Red indicator

Time delay Red indicator

Leakage trip 7-segment display &

red indicator

ME-T fault 7-segment display & red indicator

Real-time leakage current 7-segment display

Zero-Phase Current Transformer

To operate with Mikro's ME-T series of current transformer

Delay time adjustment 0.05s - 0.5s (Step = 0.05s)

Mechanical

Mounting method Standard 35mm DIN rail mounting

Approximate weight 0.38kg (excluding ME-T)

a - Trip status indicator

b - Model

c - Alarm status indicator

d - Up button

e - Down button

f - Reset/mode button

g - Integral test button

h - DP indicator

i - FUNCTION indicator

j - DATA indicator

Symbols

I△n - Sensitivity setting

△t - Time delay setting

Flt 1 - Fault record 1 (Newest)

Flt 2 - Fault record 2

Flt 3 - Fault record 3 (Oldest)

02 4047 0777 www.mercs.com.au02 4047 0788

MerCs Pty Ltd, 55 Pendlebury Rd, Cardi, NSW, 2285, Australia | 2020 V1.1

Earth Leakage Relay ME-ELR-DD

e. Program Setting

Step 1: Press “RESET” button until the function digit shows the required function.

Step 2: Press the “UP” and “DOWN” button simultaneously and hold for 1 sec to enter programming mode. The function digit will blinks

to indicates the relay is in programming mode.

Step 3: Use the “UP” or “DOWN” button to select the desired value.

Step 4: To save the selected value, press the “UP” and “DOWN” button simultaneously and hold for 1 sec again. It will exit the program-

ing mode with data digits displaying new setting.

To exit programming mode without saving the selected setting, press the “RESET” button once.

Push Button Operations

a. Integral Trip Test:

Press the “TEST” button to perform an integral test on the relay ranging from analog sensing circuitry to output contact(s) of the relay

as well as the relay indicators and display.

b. Trip Reset:

Press the “RESET” button to reset the relay when tripped

c. CT Fault:

Press the “RESET” button to reset the relay after xing the ME-T connection error. No reset function is carry out if the fault is not

cleared.

d. View Setting:

When the relay is not under tripped condition or ME-T fault condition pressing the “RESET” button will scroll through the various

functions.

FUNC DP DATA

o o Real time leakage current

1 o Sensitivity setting

2 o Delay time setting

A on Fault record 1 (Newest)

b on Fault record 2

c on Fault record 3 (Oldest)

Message Description

‘ Ct’ Error in ME-T connection

‘tSt’ Relay tripped under test mode

Table 2: Function codes

Table 3: Display messages

Table 1: System status

1 = ON

0 = OFF

X = Don’t care

B = Normal blinking

FB = Fast blinking

FUNC = FUNCTION

02 4047 0777 www.mercs.com.au02 4047 0788

MerCs Pty Ltd, 55 Pendlebury Rd, Cardi, NSW, 2285, Australia | 2020 V1.1

Earth Leakage Relay ME-ELR-DD

Connection Diagrams

Case Dimension

Record

The ME-ELR-DD incorporates a fault record function. It records the 3 latest tripped faults current and stored in non-volatile memory. No data

is recorded if the tripping is triggered by integral test button.

Remote Input

The ME-ELR-DD built in one remote reset input. Tis digital input is to remotely reset the relay when tripped or afer xing the ME-T connec-

tion error. To reset the relay, make a connection between terminals 4 and 5 of the relay.

Output Contact

a. Trip Contact

This is the latching type contact. It is energized either relay tripped due to leakage fault or broken connection between the relay and

the ME-T.

b. Positive Safety Contact

Contact energized when the relay is power up and function correctly with no tripping.

c. Pre -Fault Contact

Contact energized when the leakage current exceeded 50% of the sensitivity setting and deenergized when the leakage current drop

below 45% of the sensitivity setting.

Contact is energized and latched if the relay is either tripped due to leakage fault or broken connection between the relay and the ME-T.

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