DOLD MK 9053N Current Monitoring Relay Instruction Manual
- June 15, 2024
- DOLD
Table of Contents
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
Terminal designation | Signal description |
---|---|
A1, A2 | Auxiliary voltage |
i, k | Current measuring input |
11, 12, 14 | 1st changeover contact |
21, 22, 24 | 2nd changeover contact |
at MK 9053/1 : Z1, Z2, Z3 | Remote potentiometer for response value |
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|
- DC or AC current 50 … 5000 Hz
(Other frequency ranges of 10 … 5000 Hz, e.g. 16 2/3 Hz on request)
|
Nominal voltage | Voltage range | Frequency range |
---|---|---|
AC/DC 24 … 80 V | AC 18 … 100 V | 45 … 400 Hz; DC 48 % W |
DC 18 … 130 V | W £ 5 % | |
AC/DC 80 … 230 V | AC 40 … 265 V | 45 … 400 Hz; DC 48 % W |
DC 40 … 300 V | W £ 5 % |
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
- The unit has to be disconnected.
- Insert a screwdriver in the side recess of the front plate.
- Turn the screwdriver to the right and left.
- 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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