DOLD MK 9053N Current Monitoring Relay Instruction Manual

DOLD MK 9053N Current Monitoring Relay

Product Description

The current relay MK 9053N of the VARIMETER series monitors single phase DC or AC voltage systems. The adjustment is made via potentiometers on the front of the device. Early recognition and preventive maintenance avoid interruptions of electrical plants and provides a higher operational and plant safety.

Circuit Diagrams

Connection Terminals

Safety Notes

Please observe when connecting a remote potentiometer to MK 9053N/1 :
Measuring circuit and remote potentiometer not galvanically separated. The voltage on on measuring circuit i, k / PE has connection to the remote potentiometer. The remote potentiometer has to be connected volt- and ground- free.

Your Advantages

• Preventive maintenance
• For better productivity
• Quicker fault locating
• Precise and reliable

Features

• According to IEC/EN 60255-1, IEC/EN 60947-1

• To: Monitor DC and AC

• Measuring ranges from 2 mA up to 10 A

• High overload possible

• Input frequency up to 5 kHz

• Galvanic separation between auxiliary circuit – measuring ciruit

• With start-up delay

• With time delay, up to max. 100 sec

• As option with remote potentiometer

• As option with manual reset

• Option with fixed settings possible

• LED indicators for operation and contact position

• As option with pluggable terminal blocks for easy exchange of devices
  – With screw terminals
  – Or with cage clamp terminals

• Width: 22.5 mm

Applications

• Monitoring current in AC or DC systems
• For industrial and railway applications

Function

The relays measure the arithmetic mean value of the rectified measuring current. The AC units are adjusted to the r.m.s value. They have settings for response value and hysteresis. The units work as overcurrent relays but can also be used for undercurrent detection. The hysteresis is dependent on the response value.

2 time delays are possible in different variants:
The start up delay ta operates only when connecting the auxiliary supply. It disables tripping e.g. caused by an increased starting current of a motor. The response delay tv is active after exceeding a response value. On overcurrent relays the delay is active when the current goes over the tripping value, on undercurrent relays when the current drops below the hysteresis value.

Indicators

• Green LED: On, when auxiliary supply connected
• Yellow LED: On, when output relay acitvated

Function Diagram with Start-up Delay

On model MK 9053N/6 with manual reset the contacts remain in the fault state after detecting a fault or after to has elapsed. The contacts are reset by disconnecting the supply voltage.

Technical Data

Input (i, k)

MK 9053N with 1 Measuring range for| AC a n d| | DC| |
---|---|---|---|---|---
Measuring range1)| RM| max. perm. cont.| |
(internal measu- ring resistor (shunt)| current| max. permiss. current 3 s On, 100 s Off|

AC

| ****

DC

|
Device mount. without distance| with 5 mm dis- tance|
2 – 20 mA| 1.8 – 18 mA| 1.5  W| 0.5 A| 0.7 A| 1 A|
20 – 200 mA| 18  – 180 mA| 0.15 W| 1.5 A| 2 A| 4 A|
30 – 300 mA| 27  – 270 mA| 0.1  W| 2 A| 2.5 A| 8 A|
50 – 500 mA| 45  – 450 mA| 0.1  W| 2 A| 2.5 A| 8 A|
0.1-     1  A| 0.09 – 0.9     A| 30 mW| 3 A| 4 A| 8 A|
0.5-     5  A| 0.45 – 4.5     A| 6 mW| 8 A| 11 A| 20 A|
1 – 10  A| 0.9 –      9     A| 3 mW| 12 A| 15 A| 20 A|

1. DC or AC current 50 … 5000 Hz

(Other frequency ranges of 10 … 5000 Hz, e.g. 16 2/3 Hz on request)

|

Nominal consumption:
4 VA; 1.5 W at AC 230 V Rel. energized
1 W at DC 80 V Rel. energized

Output
Contacts: 2 changeover contacts
Thermal current Ith: 2 x 4 A

Switching capacity
to AC 15: 1.5 A / AC 230 V IEC/EN 60947-5-1
to DC 13: 1 A / DC 24 V IEC/EN 60947-5-1

Electrical life
at 2 A, AC 230 V cos ϕ = 1: 105 switching cycles

Short-circuit strength
max. fuse rating: 6 A gG / gL IEC/EN 60947-5-1
Mechanical life: 20 x 106 switching cycles

General Data

CCC-Data

Thermal current Ith: 4 A
Switching capacity
to AC 15: 1,5 A / AC 230 V IEC/EN 60 947-5-1
to DC 13: 1 A / DC 24 V IEC/EN 60 947-5-1

Standard Type
MK 9053N.12/010 AC 0.5 … 5 A AC/DC 80 … 230 V tv 0 … 20 s ta 0.1 … 20 s
Article number: 0063176

• For Overcurrent monitoring
• Measuring range:: AC 0.5 … 5 A
• Auxiliary voltage UH: AC/DC 80 … 230 V
• Time delay by tv: 0 … 20 s
• Start up delay ta: 0.1 … 20 s
• Width: 22.5 mm

Ordering Example for Variants

Options with Pluggable Terminal Blocks

Notes
Removing the terminal blocks with cage clamp terminals

1. The unit has to be disconnected.
2. Insert a screwdriver in the side recess of the front plate.
3. Turn the screwdriver to the right and left.
4. Please note that the terminal blocks have to be mounted on the belonging plug in terminations.

Accessories

AD 3: Remote potentiometer 470 KΩ
Article number: 0050174

Setting

Example:
Current relay AC 0.5 … 5 A

AC according to type plate:
i.e. the unit is calibrated for AC
0.5 … 5 A = measuring range
Response value AC 3 A
Hysteresis AC 1.5 A

Settings
Upper potentiometer: 0.6 (0.6 x 5 A = 3 A)
Lower potentiometer: 0.5 (0.5 x 3 A = 1.5 A)

The AC – devices can also monitor DC current. The scale offset in this case is: I = 0.90 x Ieff
AC 0.5 … 5 A is equivalent to DC 0.45 … 4.5 A
Response value DC 3 A
Hysteresis DC 1.5 A

Settings
Upper potentiometer: 0.66 (0.66 x 4.5 A = 3 A)
Lower potentiometer: 0.5 (0.5 x 3 A = 1.5 A)

Characteristic

Time delay of measuring circuit

The diagram shows the typical delay of a standard devices depending on the measured values “X on and X off” at sudden rise or drop of the signal. At slow change of the measured value the delay is shorter.
The total reaction time of the device results from the adjustable delay tv and the delay created by the measuring circuit.
The diagram shows an average delay. The delay times could differ on the different variants.

Example for “X on” (overcurrent detection with MK 9053N/010):
Adjusted setting value X on = 2 A.
Due to a stalled motor the current rises suddenly to 10 A.

Reading from the diagram:
The output relay switches on after 31 ms at a setting tv=0.

Example for “X off” (undercurrent detection with MK 9053N/012):
Adjusted hysteresis setting value is 10 A.
The current drops suddenly from 23 A to 0 A.

Reading from the diagram:
The output relay switches off after 70 ms at a setting tv=0.

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