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Doepke

DE EN

Installation and Operating Manual

Residual current monitoring relay DMD 2

General information

Residual current monitoring relay DMD 2 features a manual threshold and hysteresis

setting, an automatic undervoltage shutdown and four selectable residual current

measuring ranges. The threshold (switching threshold) can be freely configured

within the measuring ranges. A green control diode signals when the relay is ready

once the operating voltage is applied. If there is no fault message or link across termi

nals 5 and 6, the output relay of the DMD 2 is closed when correct operating voltage

is applied. If the residual current exceeds the set threshold, the relay de-energises

once the configurable hysteresis has expired. The red control diode indicates that a

fault has occurred. If the measured residual current drops to 75 % of the set switching

threshold, an automatic fault reset is performed, i. e. the output relay energises again

and the red control diode goes out. If the operating voltage is interrupted or drops to

an unacceptable level, the output relay de-energises. It is automatically reset when

the correct operating voltage returns to within the specified voltage thresholds.

When terminals 5 and 6 are connected, the output relay functions as a standard nor

mally open contact. This means that the contact is closed when a fault occurs. For

undervoltage tripping via the normally closed contact, the link across terminals 5 and

6 has to be removed.

A ten-light LED status bar display indicates both the present residual current and

the set switching threshold. The measured residual current is shown with flashing

LEDs and the set switching threshold is indicated with constant LEDs, as seen in the

following examples.

LED status bar display function

I Δ = 10 %

I Δ = 15 %

100 %

90 %

80 %

70 %

60 %

50 %

40 %

30 %

20 %

10 %

set power-on threshold, e.g. 50 % (constant)

measured residual current (flashing)

The DMD-P panel, which can be ordered as an accessory, can be used to provide an

additional external operating status and threshold warning.

Mounting

Residual current monitoring relay DMD 2 operates wherever it is mounted. Installation

may only be carried out by an authorised specialist, who is familiar with the relevant

national installation regulations.

Installation notes

The smallest possible measuring range should be selected in order to achieve the

largest possible resolution for the LED status bar display.

Ensure protection against moisture and dust is in place during installation.

The residual current monitoring relay should not be installed in close proximity to

large contactors or main power lines, as strong magnetic fields may impair its function.

Direct all conductors required for operating the system (except for PE conductors)

through the transformer

Strip metalcoated cables.

Testing

The testing of all safety measures on commissioning must be carried out according to

the information in the valid national installation regulations. The function of the LEDs

themselves can be checked by pressing the test key when the operating voltage is ap

plied. When the test key is pressed, the LED status bar display must flash 100 % and the

red fault control diode must light up.

3930040 | 09/2013 | Doepke Schaltgeräte GmbH, Stellmacherstraße 11, D-26506 Norden

I Δ = 30 %

I Δ = 35 %

100 %

90 %

80 %

70 %

60 %

50 %

40 %

30 %

20 %

10 %

Guarantee

All professionally installed, unaltered devices are covered by warranty during the

statutory guarantee period from the day of purchase by the end user. The guarantee

is not applicable to damage incurred during transport or caused by short-circuit,

overloading or improper use. In the event of defects in workmanship or material,

which are discovered within the guarantee period, the company will provide a repair

or replacement free of charge. The guarantee will be rendered null and void if the

device is opened without authorization.

Technical Data

DMD

Operating voltage

Rated residual cur

rent I Δn

Residual current

sensitivity

Threshold (switching

threshold)

Threshold deviation

Response time

Switching delay t v

at I Δn

Residual current

transformer

Relay output

Semiconductor

outputs 5, 6, 7, 8

Operating voltage

display

Fault indicator

I Δ = 40 %

Switching threshold

100 %

Residual current

90 %

I Δ in %

80 %

Surge current

70 %

strength (8/20)

60 %

Terminals

50 %

Protection class

40 %

Ambient tempera

ture

30 %

20 %

Wiring diagrams

10 %

V DMD 2

230 V (+10 % / -15 %), 50 Hz

adjustable: 30 mA, 100 mA, 300 mA, 1000 mA

AC and pulsating DC residual currents

freely adjustable: 10–100 % I Δn

1 × I Δn ≤ 100 ms (with hysteresis t v = 0.1 s)

5 × I Δn ≤ 40 ms (with hysteresis t v = 0.1 s)

freely adjustable: 0.1 s to 1 s

Ø 25 mm

1 changeover contact, 230 V AC / 2 A

connection for external panel DMD-P

(load max. 10 mA, short-circuit-proof)

LED, green

ten-LED status bar display,

10–100 % constant, resolution 10%

ten-LED status bar display,

10–100 % flashing, resolution 5 %

max. 2.5 mm²

-25 °C to +65 °C

Lastkreis

(load circuit)

I n[%]

100

I n[%]

BETRIEB

Ub~230 V

tv[s]

ALARM

0,1

1,0

IP 40

TEST

DMD 2

1000

300

13 14 15 16

0–10 %

LED, red

> 250 A

IP 40

X4 X3

100

Betrieb

Alarm

DMD P

Reset

I n[mA]

100

13 14 15 16