mu250_user_manual mikro
Contents
1. 7 Technical Data Setting Ranges Undervoltage Time delay for undervoltage Overvoltage Time delay for overvoltage Unbalance Time delay for unbalance Phase loss Phase sequence Start time delay Power Supply Input Phase to phase voltage Supply frequency Maximum power consumption Contacts Contact arrangement Contact rating Contact material Operating time Expected electrical life Expected mechanical life Indicators Auxiliary supply Pickup indicator Trip Mechanical Mounting Approximate weight Accuracy Protection thresholds Time delay Measurements 8 Case Dimensions 71mm lt 2omm _ o Front wu sy o a l Figure 6 Case Dimensions 1 25 0 1s 30s 1 20 0 1s 30s 5 20 0 1s 30s Fixed time lt 0 1s Fixed time lt 0 1s 0s 999s 380V 25 415V 20 AC 45Hz to 65Hz 3VA Change over 5A 250V AC cos 1 Silver alloy 15 ms max 100 000 operations at rated current 5 x 10 operations Green LED indicator Red LED indicator 7 segment display and red LED indicators Din rail mounted 0 31kg 143 0 0 5s 15 with a minimum of 40ms 0 6s and above 3 1 3 70mm i ww gg 30mm 20 mm 20 mm MU250 3 Phase Voltage Relay User s Guide Brief Overview h a g e E Z E whl Lt Lt Lt b a 3 Phase U lt lt J U gt gt 5 14 Voltage Bte Ht Bota eat2. A f d e Figure 1 Front panel overview a Auxiliary power Symbols supply LED U lt lt Undervoltage b Trip Pickup LED t lt lt Undervoltage time c Up key delay d Down key U gt gt Overvoltage e Reset Mode key t gt gt Overvoltage time delay f Test key A Unbalance phase g Data LED th Unbalance time h Function LED delay 1 General Description MU250 is a voltage relay that combines overvoltage undervoltage unbalance phase loss phase sequence and delay start functions It can be connected with or without neutral wire MU250 incorporates a 4 digit LED display which allows direct numerical readout of set values actual measured value and system indication MU250 has 2 relay outputs R1 and R2 R1 is On under normal operating condition R2 can be programmed to on during trip state or during pickup and trip state 2 Voltage and Frequency Display During power up when the relay is not under tripped condition the display will show voltage and frequency reading The Function LED indicates which line phase of voltage is being displayed or shows F when frequency is being displayed The Data LED showing value Press UP or DOWN to scroll through the parameters as shown in Figure 2 and 3 depends on L L or L N setting Err l LL Frequency Figure 2 Display for L L setting 415V and 50 0Hz shown as example v u2 U3 AIL I Lt Von ILI
3. L Il u1 u2 U3 U3N Err l LL Frequency Figure 3 Display for L N setting 240V and 50 0Hz shown as example a Auto Scroll Auto scroll let the display to scroll to the next available parameter every 10 seconds To toggle auto scroll mode press UP and DOWN simultaneously 3 Settings a Setting Display When the relay is not under tripped condition pressing RESET MODE will scroll through various settings Function LED showing number or alphabet to indicate which setting is being view as shown in Figure 4 Table 1 gives description of each setting Tip To quickly jump back to voltage display during setting display press and hold RESET MODE for more than 1 5 seconds b Programming Setting Step 1 Press RESET MODE until the Function LED shows the required setting Step 2 Press UP and DOWN simultaneously to enter programming mode The Function LED blinks to indicates the relay is in programming mode Step 3 Press UP or DOWN to select the desired value Step 4 To save the selected value press UP and DOWN simultaneously again It will exit the programming mode with the Data LED displaying the newly set value To exit programming mode without saving the selected setting press RESET MODE once Voltage Frequency Display v Trip History Vv 1 U lt lt Undervoltage y 2 t lt Undervoltage time
4. delay Vv 3 U gt gt Overvoltage k d 4 t gt gt Overvoltage time delay y 5A Unbalance ES 6 t Unbalance time delay Vv At Start time delay start y b Phase k d c Nominal voltage u d Relay R2 y E Auto Manual reset Figure 4 Display mode when pressing Reset Mode Setting Function Setting Range Description U lt lt Undervoltage 1 25 Undervoltage from nominal voltage t lt lt Undervoltage delay 0 1 30 s Time delay for undervoltage U gt gt Overvoltage 1 20 Overvoltage from nominal voltage t gt gt Overvoltage delay 0 1 30 s Time delay for overvoltage A Unbalance 3 20 ta Unbalance delay 2 3 4 5 6 A t start Starting delay 0 999 s Unbalance Unbalance time delay On time delay of R1 during power up Phase L L L N L L Display and uses Line to line voltage L N Display and uses Line to Neutral voltage c Nominal voltage 380 400 415 V or Nominal voltage Value depends on L L 220 230 240 V or L N setting d Relay R2 O Trip 1 Pickup Trip R2 on during trip Pickup R2 on during pickup and trip E Auto Manual resetting O auto 1 manual auto auto reset when trip condition clear manual press RESET MODE to reset Table 1 Description of functions c Undervoltage Undervoltage pickup
5. ip condition press RESET MODE to reset the relay the relay will reset if condition permits If relay is set to Auto reset the relay will reset automatically if the condition is 5 below trip condition c Trip Test Press TEST button to simulate a trip condition tESt will blink R1 off and R2 on Press RESET MODE to reset d Trip History Display During Voltage and frequency display Press RESET MODE button to jump to Trip History Display Display shows the previous trip status with a dot blinking at Function LED To clear trip history press UP and DOWN simultaneously e Trip Bypass Mode To disable tripping due to incorrect setting press RESET MODE and TEST simultaneously during power up The Trip LED slow blink to indicate Trip Bypass Mode Go into programming mode to correct the setting Power off and on to reset the relay 5 Output Contacts MU250 has 2 relay outputs R1 and R2 R1 is On under normal condition R2 can be programmed to on during trip state or during both pickup and trip state 6 Typical Application Diagram 1 1 I I I 1R1 9 R2 Q Ee el i s ofo u efe a I l com NO NC COM NO NC Figure 5 Neutral connection is optional when Phase option is set to L L Neutral connection is required when Phase option is set to L N refer to Setting b Phase
6. occurs when any line to line or line to neutral voltage is less than nominal voltage U lt lt relay trips when delay time is elapsed d Overvoltage Undervoltage pickup occurs when any line to line or line to neutral voltage is more than nominal voltage U gt gt relay trips when delay time is elapsed e Unbalance Unbalance is calculated as Vmax Vmin Vmin X 100 Where Vmax is the maximum voltage among the 3 voltages Vmin is the minimum voltage among the 3 voltages Unbalance pickup occurs when unbalance is more than set relay trips when delay time is elapsed Phase Sequence trip occurs when the phase sequence in any 2 or all of the lines are reversed No additional delay for phase sequence detection Phase Loss trip occurs when any voltage is less than 70 of nominal No additional delay for phase loss detection f Starting Delay Starting delay is the delay time for R1 to turn on during power up under normal condition 4 Trip a Trip Display During pickup Trip Pickup LED blinks Relay R2 on if it is set to 1 Pickup During trip condition Trip Pickup LED on Function LED and Data LED blinks with trip source as shown below Function LED Data LED Description 1 trip voltage Undervoltage trip 3 trip voltage Overvoltage trip 5 Ub Unbalance trip 5 PL Phase loss trip 5 PS Phase sequence trip t EST Test Table 2 Trip display b Trip Reset During tr
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