F&F DMA-1 CT TrueRMS Bedienungsanleitung

- 1 -

The DMA-1 CT is a 1-phase current intensity indicator, adapted

for measurement in an indirect circuit using current transfor-

mers with an output current of 5 A.

The sensor correctly measures the true rms value of the

current (TrueRMS), even in the case of a distorted (de-

formed) current waveform.

The indicator continuously measures the TrueRMS current value,

the result of which is shown on a 3-digit segment display on the

facade of the unit.

The indicator allows the value of connected current transfor-

mers to be set, so that the value shown on the display corre-

sponds to the actual current value.

The DMA-1 CT is suitable for mounting in a switchgear directly

on a 35 mm DIN rail.

Purpose

Functioning

DMA-1 CT TrueRMS

Current intensity indicator,

1-phase

F&F Filipowski L.P.

Konstantynowska 79/81, 95-200 Pabianice, POLAND

phone/fax (+48 42) 215 23 83 / (+48 42) 227 09 71

www.fif.com.pl; e-mail: biuro@fif.com.pl

Do not dispose of this device in the trash along with other waste! According to the

Law on Waste, electro coming from households free of charge and can give any amo-

unt to up to that end point of collec� on, as well as to store the occasion of the purchase

of new equipment (in accordance with the principle of old-for-new, regardless of brand).

Electro thrown in the trash or abandoned in nature, pose a threat to the environment

and human health.

- 2 -

1 LCD display

2 SET button

Front description

- 3 -

1. Switch off power supply.

2. Install indicator on DIN rail.

3. Connect the indicator according to the connection diagram:

»Connect the power supply of the indicator (230 V AC) to

terminals 5 and 6;

»The current transformer output is connected to terminals 2

and 8.

4. Switch on the power supply.

If the secondary windings of the measuring transformers

are open (e.g. during assembly) and a current flows thro-

ugh the measured circuit, a dangerous voltage may be

induced at the terminals of the measuring transformer.

It is absolutely necessary to protect oneself from such a

situation by switching off the power supply of measured

circuits or installing additional bridges short-circuiting

the secondary side of a measuring transformer.

The indicator is designed for current measurement using

current transformers with a rated output current of 5 A.

Current flow through the measuring circuit of the indi-

cator of a value higher than 6 A may lead to damage of

the indicator.

For increased safety, it is recommended that one side

of the current transformer be earthed as shown in the

connection diagram.

Mounting

- 4 -

Wiring diagram

- 5 -

2 L phase – current input (S1 terminal of the

transformer)

5 power supply 230 V AC (phase wire)

6 power supply 230 V AC (neutral wire)

8 L phase – current output (S2 terminal of the

transformer)

In order for the indicator to show current values, the cur-

rent transformers connected to the indicator must first be

programmed.

The DMA-1 CT indicator is adapted for use with the following cu-

rrent transformers with 5A secondary and primary current: 20,

25, 30, 40, 50, 70, 75, 80, 100, 120, 125, 150, 160, 200, 250, 300,

400, 500, 600, 700, 750, 800, 900, 1000 A.

1.Press and hold down the SET button located on the facade of

the indicator.

2.Release the button after a minimum of 5 seconds.

3.Use successive short presses of the SET button to set the de-

sired current ratio value.

4.Confirmation of the change takes place by pressing the SET

button for a minimum of 5 seconds.

The set value of the current ratio is indicated each time

on the display of the indicator when the power is swit-

ched on.

Configuration

Current transformer setting

Current ratio programming

- 6 -

power supply 165÷265 V AC/DC

measurement indirect (transformer 5 A)

number of measurement channels 1

measured value TrueRMS value AC current

frequency 45÷55 Hz

maximum current 6 A

measurement range 0÷5 A

maximum momentary overload 20 A/1 s

indication accuracy 1%

reading accuracy

measurement range <100 A 0.1 A

measurement range ≥100 A 1 A

display (for 1 phase) 3×LED segment 6×10 mm

power consumption 4 W

terminal 2,5 mm² screw terminals (cord)

4.0 mm² screw terminals (wire)

tightening torque 0.5 Nm

working temperature -25÷50°C

dimensions 3 modules (52.5 mm)

mounting on TH-35 rail

ingress protection IP20

Technical data

- 7 -

F&F products are covered by a 24-month warranty from the date

of purchase. The warranty is only valid with proof of purchase.

Contact your dealer or contact us directly.

F&F Filipowski sp. L.P. declares that the device is in conformity

with the essential requirements of The Low Voltage Directive

(LVD) 2014/35/EU and the Electromagnetic Compatibility (EMC)

Directive 2014/30/UE.

The CE Declaration of Conformity, along with the references to

the standards in relation to which conformity is declared, can be

found www.fif.com.pl on the product subpage.

Warranty

CE declaration

E231030

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