User Manual
Contents
1. ee 5A Auxiliary Supply Green LED indicator Frequency cccceeeeeeeteeees 50 Hz or 60 Hz PICK UD iiss cheater Red LED indicator BULA EM iiaee onionenn lt 0 3 VA at h TRIP EEEE 7 segment LED and red LED indicators Auxiliary Supply MK234A 240A 6 198 265 VAC Mechanical MK234A 110A 6 94 127 VAC Mounting isoeo ienesis Panel mounting Supply frequency n e e 50 Hz or 60 Hz Front panel Standard DIN 96x96 mm VA TAUING sssini tartes 3 VA typical Approximate weight 0 7 kg Setting Ranges Low set setting 1 gt 0 5 6 00 A 10 120 Low set definite time t gt 0 05 99 sec High set setting I gt gt 0 50 99 9 A 10 1998 High set definite time t gt gt 0 05 2 5sec Outputs Trip Contact Rated voltage ee 250 VAC Continuous carry sess 5A cos 6 1 0 Make and carry for 0 2 s 30A Contact specification Expected electrical life 10 5 operations Expected mechanical life 5 x10 operations 7 CONNECTION DIAGRAMS Overcurrent Relay ous MK 234A 8 CASE DIMENSION 96 mm lt A Front 96 mm 90mm E lt Panel Cutout 90mm gt Figure 2 Case Dimension2. 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 selected setting press the RESET key once 4 OUTPUT CONTACTS The MK234A 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 even with the removal of fault current 5 SOFT SWITCHES The MK234A incorporates 3 soft switches for system configuration When the function digit shows 8 the relay is in soft switch setting mode Choc cl LJ LI Lt Ld A switch value SVL switch number SW System configuration 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 11 Contact R2 linked to signal manual reset type 3 00 High set disabled 01 High set enabled Table 3 Soft switch setting 6 TECHNICAL DATA Ratings Indicators Rated current ee
3. MK234A Overcurrent Relay User s Guide A BRIEF OVERVIEW MK 234A a Auxiliary power supply indicator b Low setstart trip status indicator c High setstart trip status indicator d Down key e Up key f Reset key g Test key h DP indicator i FUNCTION indicator DATA indicator 1 1 DESCRIPTION Symbols l L1 current l2 L2 current l3 L3 current l gt Low set t gt Low set delay time gt gt High set t gt gt High set delay time SW Soft switches The MK234A is a microprocessor based numerical overcurrent relay It uses fundamental frequency current measurement for excellent harmonic current rejection The relay provides two element low set and high set overcurrent fault protection with definite time characteristic The 4 digit panel display on the MK234A allows the display of 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 Indicator Aux FUNC Status ofofo fo ol No Auxiliary power supply 170 0 Xx X Normal condition no tripping kouka Low set overcurrent triggered time delay countdown started 1 1 X X High set overcurrent triggered PT P V ie soomes 1 Low set tripped CT FUNC LED indicates tripping source DT LEDs show tripped value 1 High set tripped CT FUNC LED indicates tripping source DT LEDs show tripped value Ta
4. ble 1 System Status 1 ON 0 OFF X don t care not blinking B blinking DT DATA FUNC FUNCTION Indicator FUNCTION DP DATA 1 L1 load current ET off L2 load current of L3 load current off off off L1 previous tripped current L2 previous tripped current L3 previous tripped current Low set current setting Low set delay time setting High set current setting off High set delay time setting off Soft switch setting 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 condition 7 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 l II al l I 1 LI Peo aot ee Fr HAH lt P JTE 1 1 l m 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
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