User Manual
Contents
1. 1 0 0 8 0 6 0 5 0 4 0 3 0 05 1 10 Figure 5 IDMT Very Inverse Curve 20 I gt t s 200 100 0 1 1 t s 100 0 1 0 01 t s 10 0 1 0 01 1 Figure 6 IDMT Extremely Inverse Curve 1 10 20 MI gt Figure 4 IDMT Long time Inverse Curve 10 20 MI gt 9 9999 gt a ONwooo 0 3 0 2 0 1 0 05 10 20 MI gt Figure 5 IDMT Normal Inverse Curve 1 3 10 6 TECHNICAL DATA Ratings FRRAtEd CUITENE p scuinnsacrnassanions 5A Frequency ccseceeeeeeeees 50 Hz or 60 Hz BUrdEN iassa lt 0 3 VA at Auxiliary Supply MK232A 240A 6 oaaae 198 265 VAC MK232A 1104A 6 94 127 VAC Supply frequency 0 08 50 Hz or 60 Hz VA TAING sssusa 3 VA typical Setting Ranges Low set setting I gt eee 0 10 5 00 A 2 100 Time multiplier kt gt n se 0 05 1 00 Low set definite time t gt 0 05 99 sec High set setting I gt gt 0 10 50 0 A 2 1000 High set definite time t gt gt 0 05 2 5sec Outputs Trip Contact Rated voltage ee 250 VAC Continuous carry sess 5A cos 1 0 Make and carry for 0 2 s 30A Contact specification Expected electrica2. selected setting press the RESET key once 4 OUTPUT CONTACTS The MK232A has two set of output contact i CONTACT R1 linked to trip signal i CONTACT R2 linked to trip or start signal The output contact can be programmed to be either auto reset type or manual reset type For auto reset type the contact remain activated until the fault current is removed For manual reset type the contact remain activated 5 SOFT SWITCHES The MK232A incorporates 4 soft switches for system configuration When the function digit shows 8 the relay is in soft switch setting mode Coc cl BENENE N L Q switch value SVL switch number SW 1 00 Contact R1 linked to trip signal auto reset type 01 Contact R1 linked to trip signal manual reset type 2 00 Contact R2 linked to trip signal auto reset type 01 Contact R2 linked to trip signal manual reset type 10 Contact R2 linked to signal auto reset type 02 Low set long time inverse curve 03 Low set very inverse curve 04 Low set extremely inverse curve 05 Low set definite time 4 00 High set disabled 01 High set enabled Table 3 Soft switch setting t s 10 t s 10 0 1 0 01 1 10 0 05 20 MI gt Figure 2 IDMT Normal Inverse Curve 3 10 LHA a
3. MK232A Earth fault Relay User s Guide A BRIEF OVERVIEW Oa Mikre IDMT Earth Fault Relay a J b C h d e MK 232A g a Auxiliary power supply indicator Symbols b Low set start trip status indicator lo Earth fault current c High set start trip status indicator l gt Low set d Down key kt gt Low set time multiplier e Up key l gt gt High set f Reset key t gt gt High set delay time g Test key SW Soft switches h DP indicator FUNCTION indicator j DATA indicator 1 DESCRIPTION The MK232A is microprocessor based numerical earth fault relay It uses fundamental frequency current measurement for excellent harmonic current rejection The relay consists of independent low set and high set elements The high set element can be disabled by the user The time current characteristics of the low set element are definite time or five selectable IDMT curves The high set element is a definite time or instantaneous relay The 4 digit panel display on the MK232A allows the display of the present load current recorded fault current for last tripping and all settings of the relay 2 LIGHT INDICATORS The indicators display the status of the system as follow FUNC Status ofofo o fo No Auxiliary power supply 170 0 x X Normal condition no tripping kaaku Low set overcurrent triggered time delay countdown started EPET P a a time delay countdown started 1 Low set tripped DT LEDs sho
4. l life Expected mechanical life T 10 operations ae 5 x108 operations 8 CASE DIMENSION 96 mm Front 96 mm Indicators Auxiliary Supply eee Green LED indicator PICK UP assswebalesnecmdeeeren dated Red LED indicator TID E E 7 segment LED and red LED indicators Mechanical MOUNINO iiinis Panel mounting Front panel a se Standard DIN 96x96 mm Approximate weight 0 6 kg 7 CONNECTION DIAGRAMS a Earth Fault Relay MK 232A NO NO NC COM COM NC MK 232A NO NC COM COM NC NO a OOM e Panel Cutout Figure 7 Case Dimension 90mm
5. w tripped value 1 High set tripped DT LEDs show tripped value ajx x e fi Programming mode Table 1 System Status 1 0N 0 0FF X don tcare not blinking B blinking DT DATA FUNC FUNCTION Indicator Table 2 FUNCTION Code Note Under normal operating condition The 4 digit display is off When the RESET key is pressed the 4 digit display will light up The display will switch off automatically after 6 minutes if no further key is pressed 3 PUSH BUTTONS OPERATION a Trip test Press the TEST button to simulate a trip b Trip reset Press the RESET button to reset the relay when tripped c View setting When the relay is not under tripped condition pressing the RESET button will scroll through the various functions Cc p mr L i a aT ye ye Cl A I I Zl I l q ots a a aa A O ft Figure 1 Scroll sequence d Program setting Only function codes from 4 to 8 can be programmed Step 1 Press RESET key until the function digit shows required function Step 2 Press the UP and DOWN key simultaneously to enter programming mode The function digit will blinks to indicates the relay is in programming Step 3 Use the UP or DOWN key to select the desired value Step 4 To save the selected value press the UP and DOWN key simultaneously again It will exit the programming mode with the data digits displaying new setting To exit programming mode without saving the
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