Motor Protective Relay SE CSM_SE_DS_E_8_1 Solid-state Relay Provides Three Operating Functions in a Compact Package • Prevents burnouts in 3-phase induction motors due to overcurrent, open-phase, or reverse-phase. • LEDs indicate operation of the selected operating function. • Wide setting ranges: current: 1 to 160 A; operating time: 1 to 40 s. • Protects the motor from reversing without starting it. The SE cannot be used with circuits with distorted waveforms, inverter circuits, or capacitor loads. Model Number Structure ■ Model Number Legend SE-K@@@@@N 1 2 3 4 5 6 7 8 5. Control voltage 1: 100/110/120 VAC 2: 200/220/240 VAC 4: 380/400/440 VAC 6. Reset method None: Manual reset A: Automatic reset 7. Operating value None: 115% of the current SV E: 100% of the current SV 8. Product history N: New version 1. Basic model name SE: Motor Protective Relay 2. Protective functions K: Three possible operating functions: overcurrent, openphase, or reverse-phase protection 3. Operating time characteristics for overload element Q: Instantaneous type: Fixed time at starting and instantaneous during operation None: Inverse type: Inverse operation both at starting and during operation 4. Case P: Plug-in type None: Flush mount type Note: A 3-phase transformer (sold separately) must be used to operate Plug-in Relays at 380, 400, 415, or 440 VAC. Drop the primary voltage (380 to 440 VAC) to a 200-VAC secondary voltage before applying it to the SE-KP2EN or SE-KQP2EN. Ordering Information SE-@EN Overcurrent operating value: 100% of the current SV. Terminal/mounting Control voltage Reset Model Inverse type Plug-in terminal/DIN 100/110/120 VAC rail via socket 200/220/240 VAC Manual Instantaneous type (See note.) SE-KP1EN SE-KQP1EN SE-KP2EN SE-KQP2EN Screw terminal/flush 100/110/120 VAC mount 200/220/240 VAC SE-K1EN SE-KQ1EN SE-K2EN SE-KQ2EN 380/400/440 VAC SE-K4EN SE-KQ4EN Note: With start-up lock: fixed time-limit on start-up, instantaneous thereafter. Plug-in type requires a socket (8PFA1) which is sold separately. Refer to page 9 for the mounting conditions. 1 SE SE-@@N Overcurrent operating value: 115% of current SV. Control voltage Reset Model Inverse type 100/110 120 VAC 200/220/240 VAC 100/110/120 VAC 200/220/240 VAC 380/400/440 VAC Instantaneous type (See note 1.) Manual SE-KP1N SE-KQP1N Automatic SE-KP1AN SE-KQP1AN Manual SE-KP2N SE-KQP2N Automatic SE-KP2AN SE-KQP2AN Manual SE-K1N SE-KQ1N Automatic SE-K1AN SE-KQ1AN Manual SE-K2N SE-KQ2N Automatic SE-K2AN SE-KQ2AN Manual SE-K4N SE-KQ4N Automatic --- --- Note: 1. With start-up lock: fixed time-limit on start-up, instantaneous thereafter. 2. The operating value for the overload detection function of the SE-@@N is 115% of the current SV. ■ Accessories (Order Separately) Current Converters Model 3-phase Transformer Specify the primary voltage when ordering. Only one SE relay can be connected. Current range SET-3A 1 to 80 A SET-3B 64 to 160 A Model DIN rail socket SE-PT400 Voltage specification Primary side 8PFA1 380 to 480 V (wide power supply range) Secondary power consumption 7 VA Secondary side 190 to 240 V (wide power supply range) Adapter Model SE-F7AD This Adapter is used to replace existing flush mount models with new models. Specifications ■ Ratings Motor circuit Voltage: 500 VAC max. 3-phase (primary voltage at SET current converter) Current: 1 to 80 A or 64 to 160 A 3-phase (primary current at SET current converter) Power supply circuit Voltage: 100/110/120 VAC, 200/220/240 VAC, or 380/400/440 VAC 3-phase (treat as a single phase voltage when the reverse-phase function is not needed) Voltage fluctuation: +10/−15% max. of the rated voltage (+10/−50% max. for open-phase function) Frequency: 50/60 Hz ±5% Current SV range See table of Current Converter. Output relay contact Configuration: SPDT Capacity: Refer to the table below. Power consumption 100/110/120 VAC: approx. 3.5 VA; 200/220/240 VAC: approx. 7 VA; 380/400/440 VAC: approx. 11 VA Case color Plug-in model: Munsell 5Y7/1 Panel-mount model: Munsell N1.5 Output Contact Capacity Control power supply Contact Manual reset Automatic reset 100/110/120 VAC or 200/220/240 VAC NO 3 A (cosφ = 1.0)/1.5 A (cosφ = 0.3 to 0.4) at 240 VAC 3 A (cosφ = 1.0)/2 A (cosφ = 0.4) at 240 VAC NC 3 A (cosφ = 1.0)/2 A (cosφ = 0.3 to 0.4) at 240 VAC 380/400/440 VAC NO 3 A (cosφ = 1.0)/1.5 A (cosφ = 0.3 to 0.4) at 440 VAC --- NC 3 A (cosφ = 1.0)/2 A (cosφ = 0.3 to 0.4) at 440 VAC 2 SE ■ Characteristics Item Overcurrent Inverse type Instantaneous type Operating value 100% of the current SV (SE-@@EN) 115% of the current SV (SE-@@@N) Operating time characteristics Inverse time both at starting and during operation Fixed time at start-up and instantaneous during operation Operating time For an overcurrent of 600%: Time scale × 1: 1 to 10 s Time scale × 4: 4 to 40 s For an overcurrent of 200%: 2.8 × t, where t is the time at 600% overcurrent. (time SV at max.: 10 s or 40 s) In fixed time mode (start-up mode) with an overcurrent of 600%: Time scale × 1: 1 to 10 s Time scale × 4: 4 to 40 s In instantaneous mode: 0.5 s max. at 140% overcurrent Initial current in start-up mode --- Operates when the current is about 30% of the set current Inertial characteristics At the min. current SV and max. time SV, will not operate for 80% of the operating time for a 600% overcurrent. --- Open-phase Operating value: Less than 50% of the current SV (at open-phase) Operating unbalance: At high sensitivity (H): 35 ±10%; At low sensitivity (L): 65 ±10% (The unbalance for a max. 3-phase current equal to the current SV) Operating time: At high sensitivity (H): 2 s max.; At low sensitivity (L): 3 ±1 s (Open-phase current equal to the current SV) Reverse-phase Operating value: 80% max. of the rated voltage Operating time: 0.5 s max. at the rated voltage Overcurrent SV accuracy Operating value: ±10% of max. current SV Operating time: +10/−5% of max. time SV (at a time SV: 1), +10% of max. time SV (at a time SV: 2 to 10) (start-up lock) Influence of temperature (overcurrent) Operating value: ±5% for 0 to 40°C; ±10% for -10 to 50°C Operating time: ±10% for 0 to 40°C; ±20% for -10 to 50°C (start-up lock) Influence of frequency (overcurrent) Operating value: ±3% for a frequency fluctuation of ±5% Operating time: ±5% for a frequency fluctuation of ±5% (start-up lock) Influence of voltage (overcurrent) Operating value: ±3% for a voltage fluctuation of +10/-15% Operating time: ±5% for a voltage fluctuation of +10/-15% (start-up lock) Insulation resistance 10 MΩ min. between the entire electric circuits and the mounting panel 5 MΩ min. between contact circuits, or between contacts of same pole Withstand voltage Refer to the table below. Lighting impulse withstand voltage 6000 V max. between the entire circuits and the mounting panel 4500 V max. between contact circuits, or across contacts Waveform: 1.2/50 μs Overload capacity Motor circuit: 20 times the current SV for 2 s, applied twice with a 1 min interval Control voltage: 1.15 times the rated control voltage for 3 hrs Life Expectancy 10,000 operations min. (non-conducting contacts) Vibration resistance Malfunction: 10 to 55 Hz, 0.3-mm double amplitude each in 3 directions for 10 minutes Destruction: 10 to 25 Hz, 2-mm double amplitude each in 3 directions for 2 hours Shock resistance Malfunction: 98 m/s2 (approx. 10G) each in 3 directions Destruction: 294 m/s2 (approx. 30G) each in 3 directions Test button operation Operated quickly (without lighting the LED) Ambient temperature Operating: –10 to 60°C (with no icing) Storage: –25 to 65°C (with no icing) Ambient humidity Operating: 35% to 85% Altitude 2,000 m max. Weight Approx. 170 to 230 g Dielectric Strength Test Area Control voltage 100/110/120 VAC Between electric circuits and the mounting panel 2,000 VAC for 1 min 200/220/240 VAC 380/400/440 VAC 2,500 VAC for 1 min Between contact circuits and other circuits 2,000 VAC for 1 min 2,500 VAC for 1 min Between each pair of contacts 1,000 VAC for 1 min 1,000 VAC for 1 min 3 SE Engineering Data ■ Operating Characteristics 320 70 Operating time (s) Time Changeover Switch: ×4 80 Time scale value 10 8 6 4 2 1 60 50 40 280 Operating time (s) Overcurrent Operating Time Characteristics (Instantaneous Type - Start-up Lock) Time Changeover Switch: ×1 Time scale value 10 8 6 4 2 1 240 200 160 0.8 0.7 0.6 0.5 0.4 30 120 0.3 20 80 0.2 10 40 0.1 100 200 300 400 500 0 600 100 200 300 Open-phase Operating Characteristics 100 90 80 Low sensitivity (L) 70 60 50 High sensitivity (H) 40 400 500 0 600 100 200 300 400 500 600 Current (% of current SV) Current (% of current SV) Current (% of current SV) Open-phase Operating Time Characteristics Operating time (s) 0 Unbalanced factor (%) Operating time (s) Overcurrent Operating Time Characteristics (Inverse Type) 5 4 Low sensitivity (L) 3 2 High sensitivity (H) 30 1 20 10 0 100 200 300 400 500 600 Current (% of current SV) 0 100 200 300 400 500 600 Current (% of current SV) 4 SE Operation ■ Settings Motor Relay Switch Settings Current Scale Multiplying Factor Decal Determine the current scale multiplying factor corresponding to the current SV range obtained from Table 1 and paste the current scale multiplying decal to the motor protective relay. For example, when the current setting range is 8 to 20 A, the decal no. is 2. LED Indicators The LEDs indicate which function is in operation. OPEN refers to open-phase, OC refers to overcurrent, and RVS refers to reverse-phase. Manual Reset The reset button will pop out about 4 mm when the relay has been tripped. After the relay has operated, reset by pressing this button. Disconnect the power supply before resetting for reverse-phase operation. Function Setting DIP SW The three ON/OFF switches enable or disable the three functions. The functions can be enabled in any combination. With the open-phase function, the H/L switch sets the current unbalance factor. When set to H", the motor circuit operates at 35% of the current unbalance factor for operation. When set to L", the motor circuit operates at 65% min. of the current unbalance factor for operation.With the over-current function, the x4/x1 switch sets the time changeover value for the start-up mode. When set to x4", the operating time range is 4 to 40 s. When set to x1", the operating time range is 1 to 10 s. OPEN OC RVS TRIP/RESET CURRENT 7 8 6 5 9 4 10 FUNCTION RVS ON OPEN ON H ON ×1 sec OFF × OFF L OFF ×1 sec 4 2 TIME 5 6 Decal No. 0.25 0.5 1 2 4 8 16 A 7 8 9 10 TEST 3 2 1 SE-KP2N Setting Operating Current Set the current-setting knob to the required current value. The setting value is indicated by the product of the scale value and the multiplying factor as shown in the following table. The required trip current can be obtained directly by means of the current knob. sec MOTOR RELAY 4 1 2 4 8 16 32 64 Current scale value (A) 5 6 7 8 9 1.25 1.5 1.75 2 2.25 2.5 3 3.5 4 4.5 5 6 7 8 9 10 12 14 16 18 20 24 28 32 36 40 48 56 64 72 80 96 112 128 144 10 2.5 5 10 20 40 80 160 Setting Operating Time Set the time setting knob to the required time. The operating time is equal to the time scale value times the setting on the time changeover switch. For example, if the time scale value is 6 and the time changeover switch is set to 4, the operating time is 24 s. Test Button Pushing the test button momentarily operates the trip display and the output relay. The operation indicators will not light for the test button. It doesn't matter whether the function setting switch is ON or OFF. Current Converter Settings Determining the Number of Primary Conductor Runs Determine the number of passes and the tap setting from the table above. For example, if the current setting range is 8 to 20 A, there is one pass and the tap setting is 20. Pass the wires through the holes from the same direction. It doesn’t matter which wires go through which holes. SET-3A SURRENT CONVERTER No. 25053 DATE 1983 OMRON Corporation 20 40 80 MADE IN JAPAN Tap Setting In tap setting, insert the setting screw into the required tap hole with a screwdriver. After setting, be sure to replace the cover. One conductor pass (The conductors pass through the holes once.) Four conductor passes (The conductors pass through the holes four times.) 5 SE Selecting the Current Converter The current requirements of the motor determine the current range of the Motor Protective Relay, and whether the SET-3A or SET-3B Current Converter should be used, as shown in the following table. Motor specifications kW HP Motor Protective Relay A 0.2 0.25 1.4 0.4 0.5 2.3 0.75 1 Current range 3.8 Note 1 Current Converter Decal No. Passes Tap settings 1 to 2.5 0.25 8 20 2 to 5 0.5 4 20 2 20 Model 5 1.5 2 6.8 4 to 10 1 2.2 3 9.5 8 to 20 2 20 3.7 5 15 5.5 7.5 22 16 to 40 4 40 7.5 10 30 32 to 80 8 64 to 160 16 11 15 43 15 20 57 72 19 25 22 30 82 30 40 111 37 50 135 1 SET-3A 80 Fixed SET-3B Note: 1. Connect to the secondary of a commercial current transformer for motors exceeding 37 kW. 2. Connect a commercial current transformer when using high-voltage motors or low-voltage high-capacity motors. Installation ■ Internal Circuit Inverse Type To all circuits Motor X Output relay Test OPEN OC: overcurrent LED OPEN: open-phase LED RVS: reverse-phase LED RVS Power supply circuit RY drive circuit OR circuit AND circuit OC 5 6 (C+) Reverse-phase detecting circuit M Open-phase detecting circuit 8 (C−) Current SV circuit Tap setting circuit Rectifying circuit − 7 Overcurrent detecting circuit (Ta) (C+) + (Tc) 7 Control voltage (U) (V) (W) 1 2 3 8 (C−) Start-up mode time SV circuit X/C SET-3 Current Converter 4 AND circuit (Tb) Start-up detecting circuit T Open-phase Overcurrent detecting circuit detecting circuit S Current SV circuit R Instantaneous Type (Start-up Lock) SE Motor Protective Relay 3-phase 50/60 Hz OC OPEN Note: 1. The numbers in circles are the terminal numbers for Plug-in Models. The letters in parentheses are the terminal markings on Panelmounting Models. 2. You cannot use reverse-phase protection if you use control power with single-phase operation. Connect to terminals 1 and 2 for singlephase operation. Also, make sure to turn OFF the reverse-phase setting on the function setting switches. An error will occur if the SE is used with the reverse-phase setting turned ON during single-phase operation. Reverse-phase is detected in order of phase1, phase2 and phase3 of control power. 3. The AND circuit in the internal circuits contains a time setting circuit. 6 SE ■ Connections External Connections Manual Operation Low-voltage Circuit R S Automatic Operation Low-voltage Circuit R T S T Stop Start BZ BZ Alarm buzzer Electromagnetic contactor Automatic contact Electromagnetic contactor 6 5 4 6 3 7 8 1 2 + SET-3 Current Converter Motor S 1 8 2 + − M High-tension Motor No-voltage Tripping Circuit -Y) R 7 Motor M Manual Operation Low-voltage Circuit Δ Start) 3 (C+) (C−) (U) (V) Phase advancing capacitor SET-3 Current Converter − 4 SE series Motor Protective Relay SE series Motor Protective Relay (C+) (C−) (U) (V) 5 (Ta) (Tc) (Tb) (W) (Ta) (Tc) (Tb) (W) Phase advancing capacitor Alarm buzzer R T S T Potential transformer 110 V 110 V BZ Alarm buzzer Stop BZ Start Alarm buzzer No-voltage tripping coil Oil circuit breaker Magnet contactor 6 6 SE series Motor Protective Relay Phase advancing capacitor 5 4 3 (Ta) (Tc) (Tb) (W) (C+) (C−) (U) (V) + SET-3 Current Converter 7 8 1 SE-K@1@N Motor Protective Relay 2 Phase advancing capacitor 5 4 3 (Ta) (Tc) (Tb) (W) (C+) (C−) (U) (V) 7 Current transformer 8 1 2 − + changeover M High-tension motor Motor − M SET-3 Current Converter Note: 1. When using the SE as a 2E (overload and open-phase) relay, it is not necessary to connect terminal 3 (W). Also, always turn OFF the reverse-phase elements. 2. When using a model with an automatic reset, the Motor Protective Relay may not operate if there is an open phase on the power supply side of the motor circuit. 3. Supply control power to the Motor Protective Relay from the power supply side of the contactor. The Motor Protective Relay may not operate at the set time if the power supply of the Motor Protective Relay is turned ON at the same time that the motor starts. 7 SE Manual Operation Low-voltage Circuit (When using a SE-K@P2@N in a 400/440 VAC Circuit) R S T Automatic Operation Low-voltage Circuit (High-capacity Motor) 100 or 200 VAC SE-PT400 U u V v W w R S T Magnet contactor Stop Alarm buzzer BZ Start Alarm buzzer BZ Automatic contact 6 5 4 3 (Ta) (Tc) (Tb) (W) SE series Motor Protective Relay Magnet contactor 6 5 4 Phase advancing capacitor 3 (C+) (C−) (U) (V) 7 8 1 2 Current transformer SE-K@P2@N Motor Protective Relay + Phase advancing capacitor 7 SET-3 Current Converter 8 1 2 − Motor + M SET-3A Current Converter − Motor M Automatic Operation Manual Operation Low-voltage Circuit (Using the Overcurrent and Open-phase Functions) R R S S T T Control power supply Stop Stop Start BZ BZ Start Alarm buzzer Alarm buzzer Magnet contactor Magnet contactor 6 6 5 4 3 (Ta) (Tc) (Tb) (W) (C+) (C−) (U) (V) 7 + SET-3 Current Converter Motor − M 8 1 2 4 3 SE series Motor Protective Relay SE series Motor Protective Relay Phase advancing capacitor 5 (Ta) (Tc) (Tb) (W) (C+) (C−) (U) (V) Phase advancing capacitor 7 8 1 2 SET-3 Current Converter Motor M Note: 1. When using the SE as a 2E (overload and open-phase) relay, it is not necessary to connect terminal 3 (W). Also, always turn OFF the reverse-phase elements. 2. When using a model with an automatic reset, the Motor Protective Relay may not operate if there is open phase on the power supply side of the motor circuit 3. Supply control power to the Motor Protective Relay from the power supply side of the contactor. The Motor Protective Relay may not operate at the set time if the power supply of the Motor Protective Relay is turned ON at the same time that the motor starts. 8 SE Dimensions Note: All units are in millimeters unless otherwise indicated. Plug-in Socket Terminal SE-KP@N, SE-KQP@N The Height of DIN Rail Mounting 96 SE 91 48 Flush Mount Type SE-K@N, SE-KQ@N 12 78.5 111 8PFA1 (order separately) 44 9.5 100 Panel Cutout 96 73 92 +0.8 0 50 91 45 +0.8 0 12 48 78.5 Current Converter SET-3A, SET-3B 26 9 9 9 44 14 104.5 Two, M3.5 terminal screws M3.5 screw terminals Three, 20-dia. through holes Mounting Holes Four, 6-dia. mounting holes or four, M5 mounting screw holes 33.5 112 80 80±0.5 33.5 6 20.5 40 52 28 60 73 Transformer SE-PT400 (for Use with the SE-K(Q)P2EN) Optional Adapter SE-F7AD 116.5 45 Two, 6.5-dia. Four, R7 holes 4-4.5×7 101.0 60 52±0.5 4 25 132 114 92 M3.5 screw 72.0 max. 45 90 52 Note: The SE-PT400 can be used for all 200/220/240-VAC SE Relays. Primary voltage: 380 to 480 VAC Secondary voltage: 190 to 240 VAC Note: This Adapter is used to replace existing flush mount models with new models. Plate material: Steel plate (thickness: 2.0 mm) Color: Black (Munsell N1.5) 9 SE ■ Testing Method With the circuit shown below, the characteristics listed in the following table can be tested. Determine the number of conductor runs through the holes of the current transformer in accordance with the operating current range of the Motor Protective Relay and by referring to the table in the section Selecting the Current Converter. 3-phase, 200 V, 50/60 Hz R S T SW1 100 VAC 50/60 Hz Y 1 2 CC 3 5 7 6 100 V C SW2 ± 8 R1 R1 SET Current Converter SE-KP2EN Motor Protective Relay R2 3φSD: A: V: CC: Y: 3-phase voltage regulator (5 to 15 A) AC ammeter AC voltmeter (300 V) cycle counter auxiliary relay (15 A) Test item variable resistor (50 Ω, 400 W + 400 W) fixed resistor (50 Ω, 400 W + 400 W) knife switch (three-phase) toggle switch Test procedure Operating value Overcurrent R1: R2: SW1: SW2: 1. Turn on SW1. 2. Turn on SW2 to operate auxiliary relay Y. Operating time 1. Turn on SW1 and SW2 and increase the current to the Current Converter to 600% of the current SV by adjusting the voltage regulator. Then turn off SW1 and SW2. 3. Gradually increase the current by adjusting the voltage regulator. Read the positions at which the relay oper- 2. Turn on SW1. ates. 3. Turn on SW2 and record the value of the cycle counter CC 4. Turn off SW1. when it is stopped by the relay operation. 4. Turn off SW2. Open-phase 1. Open (burn-out) any one of the Current Converter input 1. Open (burn-out) any one of the Current Converter input phases. Adjust the voltage regulator so that the currents of phases. the other two phases equal the current SV. 2. Turn on SW1 and SW2. Gradually increase the current by 2. Turn on SW1 and SW2, and record the value of the cycle adjusting the voltage regulator. counter CC when it stops. 3. Confirm that the relay operates when the current is 50% 3. Turn off SW2. or less of the current SV. 4. Turn off SW1. Reverse-phase 1. Reverse the leads at terminals 2 and 3 of the relay (indi- 1. Create a reverse-phase condition at the voltage inputs. cated by the dashed lines) to create a reverse-phase 2. Turn on SW and SW , and record the value of the cycle 1 2 condition. counter CC when it stops. 2. Turn on SW1 and SW2 and confirm that the relay oper- 3. Turn off SW . 2 ates. 3. Connect the voltage regulator to terminals 1, 2, and 3. 4. Increase the voltage by adjusting the voltage regulator, and confirm that the relay operates when the voltage is below 80% or less of the rated voltage. 10 SE ■ Checking Operation Checklist After Connection and Before Starting Motor Check the Current Converter for the proper number of conductor runs through holes and the proper direction. Relay operates instantaneously Test Operation Corrective action Apply control power supply to the relay Change the phasesequence of 3-phase voltage properly. Check the Current Converter and Motor Protective Relay for connection with proper polarity. Press the test button (for longer than the set time). Check the phase-sequence of 3-phase voltage (for 3E relays). Does the relay operate? NO Check for: 1. Loose terminal screw 2. Faulty reset of trip indicator 3. Low voltage at power supply YES NORMAL Troubleshooting Trouble Check Points Relay operates before the motor starting time has 1. Is there any open-phase trouble in the motor or its circuit (fuses, electromagnetic contacelapsed. (OPEN indicator) tors, wiring)? 2. Does the Current Converter have the correct number of conductor runs through holes? Does the conductor run in the proper direction? 3. Is the supply voltage or motor current unbalanced (unbalanced factor of more than 35%)? Relay operates after the motor starting time has elapsed. (OC indicator) 1. Does the set current match the motor current? 2. Does the set operating time match the motor starting time? 3. Does the Current Converter have the correct number of conductor runs through the holes? Motor circuit is not tripped when the relay operates following the depression of the test button. 1. Disconnect terminals 4, 5, and 6, (Ta, Tb and Tc with the flush mount type) and check the relay contacts for electrical continuity. Relay doesn’t operate properly under light loads. 1. Check each phase for an unbalance of more than 35%, and also check for waveform distortion. 2. If the open-phase unbalance sensitivity switch is set to “H”, then switch it to “L”. 3. If the switch is already set to “L”, then the open-phase ON/OFF switch can be set to OFF, but the open-phase function will be disabled. ■ Calculating the Unbalanced Factor The unbalanced factor can be obtained easily from the following graph. In the graph, the horizontal axis indicates the phase of the maximum current, whereas the two vertical axes indicate the remaining two phases. Taking the phase of the maximum current with a reference value of 1.0, the unbalanced factor is obtained in percentage from the curves centered in the graph. When the motor current IR = 100 A, Is = 60 A, and IT = 70 A, calculate the ratios of the currents, setting the value of the maximum current to 1. In this case the ratios are 1 : 0.6 : 0.7 (IR : IS : IT). To find the unbalanced factor, follow the arcs from the ratio values on the vertical axes, in this case 0.6 and 0.7, to their intersection point. The unbalanced factor can be estimated from the values on the graph. Here the unbalanced factor is approx. 36%. 11 SE Questions and Answers Q When using the SE as a 2E (overload and open-phase) relay, can the control power supply voltage be supplied separately from the motor circuit? Normal three-phase condition Complete open-phase loss Yes. Operation will be correct. DC average Value Q What is the input volt-amp consumption of the SET-3@? Unbalance Input Volt-Amp Consumption of SET-3@ at Rated Current SET-3A SET-3B Q At 20 A for 20-A model Approx. 0.1 VA/phase At 40 A for 40-A model Approx. 0.2 VA/phase At 80 A for 80-A model Approx. 0.4 VA/phase At 160 A Approx. 0.4 VA/phase Why is the control power supply 100/110 V? The main reason the SE uses a 100/110-V control power supply is because 100/110 V is applicable to high-voltage motor protection. With a high-voltage motor, the voltage is first reduced with a potential transformer, and the secondary side is connected to the SE. When using the SE as a 2E (overload and open-phase) relay, a normal 100-V power supply can be used without connecting to the secondary side of a potential transformer. For the overload factor, the DC average level is detected relative to the set value. For the phase-failure factor, the proportion of the DC average level and AC component is used to distinguish phase failure or unbalance. When the motor is operated using thyristor phase control, the motor current waveform is not a sine wave. The SE detects this as an adverse condition and initiates unnecessary operations. The example below shows a primary current and SET-3@ output waveform. When there is a large AC component in the output voltage, the SE series sometimes judges it to be a phase-failure and initiates unnecessary operations. 3.54 A Current 76° Q Output voltage How long of a power interruption is required to restart the startup lock timer with an Instantaneous-type SE Relay (with startup lock)? Approx. 0.5 s min. Q 5V Why is it not possible to use the SE in a circuit containing thyristor control or a rectifier? A schematic diagram showing the operating principle for the SE is shown below. • Load current: 2.50 A (actual value) • SET-3A output voltage: 21.00 VDC 10 ms • Phase control accuracy: 76° 0 3.54 A Current 11° SET-3@ (+) (7) 20 40 Output voltage 80 SE CT 5V (−) (8) 0 • Load current: 2.50 A (actual value) • SET-3A output voltage: 21.77 VDC • Phase control accuracy: 11° 10 ms M As shown in the above diagram, the waves for all three phases of the motor current from the CT of the SET-3@ are rectified, then converted to DC voltage, which is necessary for the SE, by the resistor at each tap, and output from the positive and negative terminals. The DC and AC component ratios in this voltage differ between the normal three-phase condition and conditions of phase-failure or unbalance. 12 SE Q What is the range of the operating time for inverse operation? What is the approximate DC output voltage of an SET-3@ Current Converter? Q Use the voltages in the following chart as a guide. Use the values in the following table as guidelines. Time scale: × 1 (s) Percentage of current setting 1 1.0 to 7.3 Time scale: × 4 (s) Three-phase current Percentage of SET-3@ current setting tap value Output voltage 40 100 200 400 Operating time setting Percentage of current setting 200% 600% 0.5 to 2.0 1 3.9 to 29.1 2.0 to 8.0 2 1.9 to 10.9 1.0 to 3.0 2 7.8 to 43.7 4.0 to 12.0 3 3.9 to 14.6 2.0 to 4.0 3 15.7 to 58.3 8.0 to 16.0 4 5.9 to 18.2 3.0 to 5.0 4 23.5 to 72.8 12.0 to 20.0 5 7.8 to 21.9 4.0 to 6.0 5 31.3 to 87.4 16.0 to 24.0 6 9.8 to 25.5 5.0 to 7.0 6 39.2 to 102 20.0 to 28.0 7 11.7 to 29.1 6.0 to 8.0 7 47.0 to 117 24.0 to 32.0 8 13.7 to 32.8 7.0 to 9.0 8 54.9 to 131 28.0 to 36.0 SET-3A/3B Current Converter Three-phase Input Current and Output Voltage Characteristics 9 15.7 to 36.4 8.0 to 10.0 9 62.7 to 146 32.0 to 40.0 Reference 10 17.6 to 40.0 9.0 to 11.0 10 70.5 to 160 36.0 to 44.0 200% 600% DC output voltage (VDC) 8.4 21 42 84 600 123 Note: 1. This is the output voltage when connected to an SE Motor Protective Relay or SAO Current Sensor. When connected to any other model, the output voltages will be about the same as those shown in the above table when the input impedance is 13.3 kΩ. 2. When testing an SE or SAO with the output voltages shown in the above table, consider the voltage values to be a guideline only. Output voltage (VDC) Operating time setting 34 Threephases 32 30 SE 7 8 SET-3@ 28 26 Digital voltmeter DV 24 22 20 18 16 14 12 10 8 Current setting range 6 4 2 20 SET-3A 40 80 SET-3B Q 0 0 0 0 0 2 4 8 16 4 8 16 32 6 12 24 48 8 16 32 64 10 20 40 80 12 24 48 96 14 16 18 20 22 24 26 28 28 32 36 40 44 48 52 56 56 64 72 80 88 96 104 112 112 128 144 160 176 192 208 224 Three-phase current (A) Can the SE be used for single-phase applications? Yes it can, but the open-phase element cannot be used. Turn OFF the open-phase setting on the function setting DIP switch. Refer to the Q&A section on the SAO Current Sensor for the overcurrent setting method. Consider using an SAO@S Current Sensor (for single-phase). Q What will happen if a control power supply with an automatic reset is taken from the same circuit as the motor circuit? The allowable fluctuation range for a control power supply with an automatic reset is 85% to 110%. An open phase in the motor circuit power supply will reduce the voltage to up to 50%. Thus, a power supply with an automatic reset will not be able to operate. 13 SE Q Can the SE be used for three signal-phase lines? The SE is designed for three-phase power. It cannot be used for three single-phase lines. Consider using an SAO-@S Current Sensor (for single-phase). Q Q Can two SE Relays be connected to the SET-3@? No, they cannot. Refer to the Q&A section on the SAO Current Sensor. Can the SE be used in an inverter circuit? The SE may not work properly in an inverter circuit. • The error in the overload element will increase and the open-phase element will operate unnecessarily. • The SE does not contain circuits to remove inverter noise. Safety Precautions On Operation Connections Connect the phase advancing capacitor to the power supply before the Current Converter. Make sure that the polarity is correct when connecting the Current Converter and relay. There are cases in which a 100/110 V power supply can be used. The main reason for using a 100/110 V power supply is to protect a high-tension motor. With a high-voltage power supply, the voltage must be reduced with a potential transformer. It is also possible to use a 100/110 V power supply with the 2E-type (two function) relays. When using a commercial current transformer with a high-tension or low -voltage, high-capacity motor, pass the external wiring of the secondary through the holes in the Current Converter. Use a commercial frequency power supply only for the control power supply. When using as a 3E (3 function) relay, connect the three-phase voltage correctly, as with external connections. When using as a 2E (2 function) relay, it is not necessary to connect terminal 3 (W). The Motor Protective Relay cannot be connected to circuits containing thyristors, rectifiers, or VVVF inverters. See explanation under the heading Use with Thyristors, Rectifiers, or VVVF Inverters, below. The Motor Protective Relay also cannot be used to detect an overcurrent in an inching run, because the overcurrent detection circuit is reset at every inching step. When using an SE relay with a current requirement below 1 A, increase the number of conductor runs through the holes in the Current Converter. Use a model SAO sensor for single-phase applications. Refer to the SAO datasheet. Mounting When installing with an 8PFA1 connecting socket, first fasten the socket firmly to the panel with screws, then plug in the relay and secure it with a hook. Leave at least 30 mm of space between the relays for the hooks. Although there is no particular restriction on the mounting direction, it is best to mount horizontally. The recommended panel thickness for panel mounting is 1 to 3.2 mm. ALL DIMENSIONS SHOWN ARE IN MILLIMETERS. To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527. In the interest of product improvement, specifications are subject to change without notice. 14 Terms and Conditions Agreement Read and understand this catalog. Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you have any questions or comments. Warranties. (a) Exclusive Warranty. Omron’s exclusive warranty is that the Products will be free from defects in materials and workmanship for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron). Omron disclaims all other warranties, express or implied. (b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS. BUYER ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE. Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the Products or otherwise of any intellectual property right. (c) Buyer Remedy. Omron’s sole obligation hereunder shall be, at Omron’s election, to (i) replace (in the form originally shipped with Buyer responsible for labor charges for removal or replacement thereof) the non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount equal to the purchase price of the non-complying Product; provided that in no event shall Omron be responsible for warranty, repair, indemnity or any other claims or expenses regarding the Products unless Omron’s analysis confirms that the Products were properly handled, stored, installed and maintained and not subject to contamination, abuse, misuse or inappropriate modification. Return of any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies shall not be liable for the suitability or unsuitability or the results from the use of Products in combination with any electrical or electronic components, circuits, system assemblies or any other materials or substances or environments. Any advice, recommendations or information given orally or in writing, are not to be construed as an amendment or addition to the above warranty. See http://www.omron.com/global/ or contact your Omron representative for published information. Limitation on Liability; Etc. OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE OR STRICT LIABILITY. Further, in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted. Suitability of Use. Omron Companies shall not be responsible for conformity with any standards, codes or regulations which apply to the combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron will provide applicable third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself is not sufficient for a complete determination of the suitability of the Product in combination with the end product, machine, system, or other application or use. Buyer shall be solely responsible for determining appropriateness of the particular Product with respect to Buyer’s application, product or system. Buyer shall take application responsibility in all cases. NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM. Programmable Products. Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence thereof. Performance Data. Data presented in Omron Company websites, catalogs and other materials is provided as a guide for the user in determining suitability and does not constitute a warranty. It may represent the result of Omron’s test conditions, and the user must correlate it to actual application requirements. Actual performance is subject to the Omron’s Warranty and Limitations of Liability. Change in Specifications. Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our practice to change part numbers when published ratings or features are changed, or when significant construction changes are made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers may be assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at any time to confirm actual specifications of purchased Product. Errors and Omissions. Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is assumed for clerical, typographical or proofreading errors or omissions. 2015.2 In the interest of product improvement, specifications are subject to change without notice. OMRON Corporation Industrial Automation Company http://www.ia.omron.com/ (c)Copyright OMRON Corporation 2015 All Right Reserved.