User Manual
Contents
1. 03 Low set very inverse curve 04 Low set extremely inverse curve 3 00 Low set normal inverse curve 3 10 01 Low set normal inverse curve 1 3 10 02 Low set long time 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 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 Make and carry for 0 2 s 30A Ratings Indicators Rated current p 0 eee 5A Auxiliary Supply 0 0 00 Green LED indicator Frequency ccceeseeeeteeeeeeeees 50 Hz or 60 Hz PI2. CK UD iio cheaters Red LED indicator B rde iiaee onanan lt 0 3 VA at h A EEEE ET 7 segment LED and red LED indicators Auxiliary Supply MK233A 2404A 6 198 265 VAC Mechanical MK233A 110A 6 00000 ee 94 127 VAC MOUNINO rsen ioina Panel mounting Supply frequency n s 50 Hz or 60 Hz Front panel cccicisisciisiviassenniss Standard DIN 96x96 mm VA TANG assosioi ansis 3 VA typical Approximate weight 0 7 kg Setting Ranges Low set setting I gt 8 0 5 6 00 A 10 120 Time multiplier kt gt 00 0 05 1 00 7 CONNECTION DIAGRAMS Low set definite time t gt 0 05 99 sec High set setting gt gt oo 0 50 99 9 A 10 1998 2 Overcurrent Relay High set definite time t gt gt 0 05 2 5sec Aux MK 233A Outputs l i Trip Contact I Rated voltage ee 250 VAC l Continuous carry sess 5A cos 1 0 i i i 1 l Contact specification ee ay el Expected electrical life 10 operations L1 Expected mechanical life 5 x10 operations L2 L3 N b Overcurrent Relay and Earth fault relay 3 phase 4 wire system Aux MK 232A ux MK 233A L N NO NC COM COM_ NC NO 8 CASE DIMENSION 90mm 96 mm lt __ lt Pa e _ S D A S Vv Figure 7 Case Dimension
3. MK233A Overcurrent Relay User s Guide A BRIEF OVERVIEW j IDMT Overcurrent Rela a Auxiliary power supply indicator b Low set start trip status indicator c High set start 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 kt gt Low set time multiplier delay time I gt gt High set t gt gt High set delay time SW Soft switches The MK233A is microprocessor based numerical overcurrent 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 MK233A 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 Indicator Aux FUNC Status ofofo o o NoAudiary powersuppy lofo f x X Normal condition no tripping PL e a time delay countdown started 1 1 X X High set overcurrent triggered ET T V iey aonn sera 1 Low set
4. s 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 selected setting press the RESET key once 4 OUTPUT CONTACTS The MK233A 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 MK233A incorporates 4 soft switches for system configuration When the function digit shows 8 the relay is in soft switch setting mode it LS Lt Lt tt A Teu 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
5. tripped HT FUNC LED indicates tripping source DT LEDs show tripped value 1 High set tripped FUNC LED indicates tripping source DT LEDs show tripped value a eS T Table 1 System Status 1 ON 0 OFF X don t care not blinking B blinking DT DATA FUNC FUNCTION Indicator Function DP DATA O L1 load current L2 load current 3 L3 load current 14 blink L1 previous tripped current L2 previous tripped current E Bink 4 off Low set current setting 5 of Time multiplier delay time setting 6 of _ High set current setting 8 of Softswitch 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 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 Hr JSE fin p U gt u gt 71 gt I I gt il Cli gI OII m a aaa e aaa as I 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 Pres
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