Mikro RX232 Earth Fault Relay User Guide
- June 13, 2024
- MIKRO
Table of Contents
RX232 Earth-fault Relay
User Guide
( a ) Function indication
( b ) Data indication
( c ) Auxiliary power supply indicator
( d ) Low-set start/trip status indicator
( e ) High-set start/trip status indicator
( f ) Up button
( g ) Down button
( h ) NFC detection area
( i ) Test button
( j ) Reset/Mode button
Features
– Two stages setting for earth fault
– IDMT and denite time
– Circuit breaker failure protection
– Selectable fundamental or true RMS
– Selectable 50 or 60 Hz frequency
– Programmable output contacts
– 30 fault, 30 pickup and 120 event records date & time stamp
– Build in NFC for read and set parameters through mobile app
– Complies with IEC 60255 standard
– ANSI code: 50G, 50N, 51N, 50BF
Case Dimensions
IDMT Curve
Typical Application Diagram
NFC Communication
Relay provides NFC communication convenient for user to read parameter values
or to change setting through Android phone with NFC feature and
Android OS version 10 and above. The Mikro RX app can be downloaded in the
mobile with one of following Methods:
{Make sure phone NFC function is turned on}
– Scan the QR code or align the mobile phone NFC antenna on the NFC logo at
relay front panel. This will take you directly to the app on Google play
https://play.google.com/store/apps/details?id=com.learn2crack.rx
Technical Data
Ratings
Rate Current In……………………………… 5A
Frequency……………………………………… 50 or 60Hz
Burden……………………………………………. <0.3VA at In
Thermal Withstand………………………. 4 x In Continuous
Auxiliary Supply
Supply Voltage……………………………… 198 ~ 265VAC
Supply Frequency………………………… 50 or 60Hz
VA Rating……………………………………….. 3VA max
Accuracy
Protection Thresholds…………………. ±3% or ±20mA
Time Delay…………………………………….. ±3% or ±40ms
Setting Ranges
(i)Earth-fault Setting
Low-set Setting Io>……………………….. 0.1A – 10.0A(2% – 200%)
Low-set time Multiplier ktIo>………. 0.01 – 1.00
Low-set Definite Time tIo>…………… 0.03 – 100s
Delay Type…………………………………….. DT, NI3/10, NI1.3/10, VI, LI, EI
High-set Setting Io>>……………………. OFF/0.1 – 50A (2% – 1000%)
High-set Definite Time tIo>>……….. 0.03 – 100s
Output Contacts
Rated Voltage………………………………….. 250VAC
Continuous Carry……………………………. 5A(Cosφ = 1.0)
Expected Electrical Life………………….. 105 operations
Expected Mechanical Life………………. 5 x 106 operations
Enviromental Conditions
Temperature…………………………………….. -10°C to 55°C
Humidity…………………………………………… 5% to 95% non-condensing
Mechanical
Mounting………………………………………….. Panel mounting
Dimension (mm) …………………………….. 96(w) x 96(h) x 90(d)
Enclosure Protection……………………….. IP54 at the panel IP20 at the body
Approximate Weight……………………….. 0.65kg
NFC Communication
Operation System……………………………. Android OS
Software Version …………………………….. Version 10 and above
System Operation
Push Button Operation
| Trip Test | Press and hold “TEST” button for 3.5 seconds |
|---|---|
| Trip Reset | Press “RESET” button |
| Scroll Display | Press “MODE” button |
| Enter Menu Mode | Press and hold “MODE” button for 1 second |
| Set/Save Setting | Press “UP” and “DOWN” button simultaneously |
| Adjust Setting | Press “UP” or “DOWN” button |
| Clear Thermal 0/0 | Press and hold “UP” and “DOWN” button simultaneously for |
1.5 seconds on Thermal page
Display Off Mode| Press “RESET” button for 10 seconds to toggle display off
mode. The display will switch off after 6 minutes if no key is pressed.
LED Indicator
| LED | Status |
|---|---|
| AUX | I> |
| 0 | 0 |
| 1 | 0 |
| 1 | 1 |
| 1 | 0 |
| 1 | B |
| 1 | X |
1 = ON
0 = OFF
B = Blinking
X = don’t care
Parameter Settings
| E | Earth-Fault Setting |
|---|---|
| I | lo> Protection (A) [DEF=0.5] |
| 2 | lo> Delay type [DEF=NI] |
| 3 | tlo> (Seconds)/ktlo> [DEF=0.1] |
| 4 | lo>>Protection (A) [DEF=10.0] |
| 5 | tlo>> (Seconds) [DEF=0.05] |
| d | Date and Time Setting |
| --- | --- |
| 1 | Year |
| 2 | Month |
| 3 | Day |
| 4 | Hour |
| 5 | Minute |
| 6 | Second |
[DEF=Default setting]
| F | FFunctions Setting |
|---|---|
| I | Frequency [50Hz/60Hz] [DEF=50Hz] |
| 2 | Measurement display [Fn= Fundametal, RnS= RMS] [DEF=Fn] |
| 3 | Output R1 reset type [n-A= Manual, AUt= Auto] [DEF=n-A] |
| 4 | Output R2 reset type [n-A= Manual, AUt= Auto] [DEF=AUt] |
| 5 | Output R2 function [DEF=lrF] [Str= Start, trp= Trip, cbF=Circuit breaker |
failure, lif= Internal relay failure] *IRF contact function
Relay healthy : R2 energized Relay fault : R2 de-energized
6| Output R1 link element [Refer figure 1] [DEF=3h]
7| Output R2 link element [Refer figure 1] [DEF=3h]
8| CBFP Delay [0.05s – 10.0s] [DEF=0.1]
9| NFC remote set [Yes/No] [DEF=No]
*
Not applicable when output R2 function set as cbF or IrF 