User Guide for Mikro MSC models including: MU350-V3.2-NX, MU350 3 Phase Voltage Relay, 3 Phase Voltage Relay, Voltage Relay, Relay
MU350-Voltage Relay – Mikro MSC Bhd
5. Typical Application Diagram L-L 100-415V AC, L-N 58-240V AC L1 L2 L3 N L1 L2 L3 (OPTIONAL) N R1 R2 AUX NC NO COM NC NO COM 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. Case Dimensions 9 6 mm Front 9 6 mm 90mm 70mm Si d e Side 90mm 90mm Panel Cutout Figure 6: Case Dimensions 7. Technical Data Setting Ranges Undervoltage : Off, 1% 25% Time delay for undervoltage : 0.1s 30s Overvoltage : Off, 1% 20% Time delay for overvoltage : 0.1s 30s Unbalance : Off, 3% 20% Time delay for unbalance : 0.5s 30s Phase loss : off, on, Fixed time <0.5s Phase sequence : off, on, Fixed time <0.5s Start time delay : 0s 999s Auto reset level : 1% 10% (undervoltage and overvoltage) Auxiliary Supply (AUX) MU350-415V MU350-220V MU350-110V MU350-240AD Supply frequency Maximum power consumption : 380V(-25%) 415V(+20%) AC : 220V(-25%) 240V(+20%) AC : 100V(-25%) 120V(+20%) AC : 85V(-25%) 265V(+20%) AC or : 110V(-25%) 340V(+20%) DC : 45Hz to 65Hz : 3VA Measuring Input Line to line Line to Neutral Frequency : 100 415(+20%) VAC : 58 240(+20%) VAC : 40Hz to 70Hz Contacts Contact arrangement Contact rating Contact material Operating time Expected electrical life Expected mechanical life : Change-over : 5A, 250V AC(cos =1) : Silver alloy : 15 ms max : 100,000 operations at rated current : 5 x 106 operations Indicators Auxiliary supply Pickup indicator Trip Mechanical Mounting Approximate weight : Green LED indicator : Red LED indicator : 7-segment display and red LED indicators : Din rail mounted : 0.31kg Accuracy Protection thresholds Time delay Measurements : ±3% : 00.5s, ± 15% with a minimum of 40ms : 0.6s and above, ±3% : ± 3% 4 MU350 3-Phase Voltage Relay User's Guide V3.2 Brief Overview h 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). a b g WVWDUW SKDVH 8QRP 5IQ 5IQ 5W\S 5VW 5VW c U 12 d f e U 23 Figure 1: Front panel overview a Auxiliary power supply LED b Trip/Pickup LED c Up key d Down key e Reset/Mode key f Test key g Function LED h Data LED Symbols U<< - Undervoltage t<< - Undervoltage time delay U>> - Overvoltage t>> - Overvoltage time delay - Unbalance/phase t - Unbalance time delay PL - Phase loss PS - Phase sequence WVWDUW - Starting delay 8QRP - Nominal Voltage IQ - Function 5W\S - R2 energized type 5VW - Reset 1. General Description MU350 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. MU350 incorporates a 4-digit LED display which allows direct numerical readout of set values, actual measured value and system indication. U 31 Frequency Figure 2: Display for L-L setting. 415V and 50.0Hz shown as example U 1N U 2N U 3N MU350 has 2 relay outputs (R1 and R2). R1 is energized under normal operating condition. R2 can be configured as normally energized or de-energized. Both R1 and R2 can be assigned to operate separately by various tripping elements. 2. Voltage and Frequency Display During power up, when the relay is not under tripping 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. 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. 1 3. Settings a) Setting Display When the relay is not under tripping condition, pressing "RESET/MODE" can scroll through various settings. Function LED shows 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. Voltage/Frequency Display Trip History 1 U<< Undervoltage % 2 t << Undervoltage time delay 3 U>> Overvoltage % 4 t >> Overvoltage time delay 5 Unbalance % 6 t Unbalance time delay b) Programming Setting 7 Phase Loss 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 indicate that the relay is in programming mode. Step 3: Press "UP" or "DOWN" to select the desired value. 8 Phase Sequence A tstart Start time delay b Phase c Nominal voltage d Relay R1 function E Relay R2 function 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. F Relay R2 type g Auto/Manual reset h Auto reset level Figure 4: Display mode when pressing Reset/Mode Setting Function 1 U<< Undervoltage Setting Range off, 1-25 % 2 t<< Undervoltage delay 0.1-30 s 3 U>> Overvoltage off, 1-20 % 4 t>> Overvoltage delay 0.1-30 s 5 Unbalance off, 3-20% 6 t Unbalance delay 0.5-30 s 7 Phase loss off, on 8 Phase sequence off, on A tstart Starting delay 0-999 s b Phase L-L, L-N c Nominal Voltage d Relay R1 function E Relay R2 function F Relay R2 type g Auto/Manual reset h Auto reset level 100 - 415 V or 58 - 240 V 0 - 7 0 - 7 0 - 1 0=auto, 1=manual 1-10 % Des cription Undervoltage % from nominal voltage Time delay for undervoltage Overvoltage % from nominal voltage Time delay for overvoltage Unbalance % Unbalance time delay Phase loss disable/enable Phase sequence disable/enable On time delay of R1 during power up L-L: Display and uses Line to Line voltage L-N: Display and uses Line to Neutral voltage Nominal voltage. Value depends on L-L or L-N setting *Refer to Table 2 *Refer to Table 2 0: Normally de-energized 1: Normally energized auto: auto reset when trip condition clear manual: press "RESET/MODE" to reset Auto reset level for U<< and U>> Table 1: Description of functions 2 c) Undervoltage Undervoltage pickup occurs when any line to line or line to neutral voltage is less than [nominal voltage U<< %], relay trips when delay time is elapsed. d) Overvoltage Overvoltage pickup occurs when any line to line or line to neutral voltage is more than [nominal voltage + U>> %], 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 setting %, 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. Phase Loss trip occurs when any voltage is less than 70% of nominal. f) Starting Delay Starting delay is the delay time for R1 to energized during power up under normal condition. g) Relay Function Selection During tripping, output contact relay R1 or R2 will be de-energized/energized if the related tripping element is activated. The setting is shown below: Code Phase OV UV Code : Displays on Data LED 0 0 0 0 Phase: Unbalance, Phase Loss 1 0 01 and Phase Sequence 2 0 1 0 OV : Overvoltage UV : Undervoltage 3 0 11 4 1 00 5 1 01 6 1 1 0 0= De-activated 7 1 1 1 1= Activated Table 2: Relay function selection 4. Trip a) Trip Display During pickup, Trip/Pickup LED blinks. During tripping condition, Trip/Pickup LED on. Function LED and Data LED blinks with trip source as shown: 3 Function LED Data LED 1 trip voltage 3 trip voltage 5 Ub 5 PL 5 PS t EST Table 3: Trip display Description Undervoltage trip Overvoltage trip Unbalance trip Phase loss trip Phase sequence trip Test b) Trip Reset During tripping condition, press "RESET/MODE" to reset the relay, the relay will reset if lower than threshold. Manual reset threshold for U>> / U<< and Unbalance is: Setting % - 1%. Auto/Manual reset setting applies to U<<, U>>, Unbalance tripping. Phase Sequence and Phase loss is always auto reset. c) Auto reset level This sets the U<< and U>> auto reset level. Unbalance auto reset is fix to 2%. Eg1. if U>> is set to 10% and Auto reset level is set to 2%, U>> trips when voltage >110%, U>> reset when voltage <108% Eg2. if U<< is set to 20% and Auto reset level is set to 5%, U<< trips when voltage <80%, U<< reset when voltage >85% If Auto reset % is equal or larger than U<< / U>> %, it will be automatically set to U<< / U>> % - 1%. d) Trip Test Trip test is used to simulate a tripping condition. Press "TEST" button and hold for 1.5s, trip LED blinks. After 3.5 seconds, "tESt" will blink, R1 deenergized and R2 will operate dependent on relay R2 type. Press "RESET/MODE" to reset. e) 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. f) 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. The relay will return to normal if no button is pressed for longer than 2 minutes. MU350 V3.2Adobe Illustrator CC 2015 (Windows) Acrobat Distiller 19.0 (Windows)