SAO-SU2N

Current Sensor SAO CSM_SAO_DS_E_5_3 Solid-state, Plug-in Current Sensor • Applicable to motor overcurrent protection and 3-phase AC current detection. • Inverse-type, start-up lock type, and instantaneous type overcurrent sensors available. • Instantaneous type under current sensor available. • Plug-in design simplifies installation, removal, and wiring. • DIN sized (48 mm x 96 mm) The SAO cannot be used in circuits with waveform distortion, inverter circuits, or with capacitor loads. Model Number Structure ■ Model Number Legend SAO-@@@@ 1 2 3 4 5 1. Basic model name SAO: Current Sensor 2. Operating time characteristics R: Inverse type: inverse time both at starting and during operation Q: Instantaneous type with start-up lock S: Regular instantaneous type 3. Detection function U: Undercurrent detection None: Overcurrent detection 4. Control voltage 1: 100/110/120 VAC 2: 200/220/240 VAC 5: 24 VDC 6: 48 VDC 7: 100/110 VDC 5. Product history N: New version Ordering Information Terminal/ mounting Control voltage Overcurrent detection Inverse type Under current detection Instantaneous type W/start-up lock* Plug-in/DIN rail via socket Instantaneous type W/o start-up lock 100/110/120 VAC SAO-R1N SAO-Q1N SAO-S1N 200/220/240 VAC SAO-R2N SAO-Q2N SAO-S2N SAO-SU1N SAO-SU2N 24 VDC SAO-R5N SAO-Q5N SAO-S5N SAO-SU5N 48 VDC SAO-R6N SAO-Q6N SAO-S6N SAO-SU6N 100/110 VDC SAO-R7N SAO-Q7N SAO-S7N SAO-SU7N * Fixed time-limit at start-up, instantaneous thereafter. ■ Accessories (Order Separately) Current Converters Model Current range SET-3A 1 to 80 A SET-3B 64 to 160 A DIN rail socket 8PFA1 Socket Type Front connecting socket Model 8PFA1 1 SAO 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, 24, 48 VDC, or 100/110 VDC (leveled DC) Voltage fluctuation: +10/–15% max. of the rated voltage Frequency: 50/60 Hz ±5% Current SV range See table of Current Converter. Output contact Configuration: SPDT Capacity: 3 A (cosφ = 1.0)/2 A (cosφ = 0.4) at 240 VAC; 3 A (resistive load)/2 A (L/R = 7 ms) at 24 VDC; 0.2 A (resistive load)/0.1 A (L/R = 7 ms) at 110 VDC Power consumption 100/110/120 VAC: approx. 3.5 VA; 200/220/240 VAC: approx. 7 VA; 24 VDC: approx. 0.3 W; 48 VDC: approx. 0.5 W; 100/110 VDC: approx. 1.2 W Case color Munsell 5Y7/1 ■ Characteristics Item Operating current SAO-R@N SAO-Q@N SAO-S@N SAO-SU@N 100% of the current SV (current when the relay is OFF for the SAO-SU@N) Operating time charac- Inverse type teristics Fixed time at start-up and in- Instantaneous type stantaneous thereafter Operating time For a 600% overcurrent: Time scale x 1: 1 to 10 s Time scale x 4: 4 to 40 s For a 200% overcurrent: 2.8 x t ±30%, where t is the operating time at 600% overcurrent. (time SV at max.) In start-up lock mode with a 600% overcurrent: Time scale x 1: 1 to 10 s Time scale x 4: 4 to 40 s In instantaneous mode: 0.3 s max. at 120% overcurrent 0.3 s max. with an overcur- 0.3 s max. when 120% the rent of 120% the current SV current SV drops below 80% Initial current in startup mode --- Approx. 30% of the current SV --- --- Inertial characteristics Will not operate for 80% of op- --erating time for a 600% overcurrent. (at min. current and max. time SV) Reset value More than 95% of the operating current Operating current accuracy ±10% of the current SV Operating time accuracy +10 /–5% of maximum time SV (at a time SV: 1) ±10% of maximum time SV (at a time SV: 2 to 10) Influence of temperature on operating current ±5% for 0 to 40°C; ±10% for –10 to 50°C Influence of tempera- ±10% for 0 to 40°C; ±20% for –10 to 50°C ture on operating time (start-up mode) Less than 105% of the operating current 0.3 s max. 0.3 s max. for –10 to 50°C Influence of frequency ±3% for a frequency fluctuation of ±5% on operating current Influence of frequency ±5% for a frequency fluctuation of ±5% on operating time (start-up mode) 0.3 s max. for a frequency fluctuation of ±5% Influence of voltage on ±3% for a voltage fluctuation of +10/–15% operating current Influence of voltage on ±5% for a voltage fluctuation of +10/–15% (start-up mode) operating time 0.3 s max. for a voltage fluctuation of +10/–15% (start-up mode) 2 SAO ■ Characteristics (continued) Insulation resistance 10 MΩ min. between electric circuits and the mounting panel 5 MΩ min. between contact circuits, or between contacts of same pole Withstand voltage 2,000 VAC for 1 min between electric circuits and the mounting panel 2,000 VAC for 1 min between contact circuits and other circuits 1,000 VAC for 1 min between contacts of same pole Lighting impulse withstand voltage 6,000 V max. between electric circuits and the mounting panel 4,500 V max. between contact circuits and other circuits 4,500 V max. between each control power circuits Waveform: 1.2 x 50 μs 3 times for each poles Overload capacity Motor circuit: Continuous current: Power supply: AC: DC: Vibration resistance Malfunction: 10 to 55 Hz, 0.3-mm double amplitude each in 3 directions for 10 min Destruction: 10 to 25 Hz, 2-mm double amplitude each in 3 directions for 2 hrs 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: Storage: Ambient humidity Operating: 35% to 85% Altitude 2,000 m max. Weight Approx. 170 g 20 times the current SV for 2 s, applied twice with a 1 min interval 125% of the maximum current SV for each current range. 1.15 times the rated power supply voltage for 3 hrs, once 1.3 times the rated power supply voltage for 3 hrs, once –10 to 60°C (with no icing) –25 to 65°C (with no icing) Engineering Data ■ Operating Time Characteristics SAO-R SAO-Q 80 70 Time scale value 10 8 6 4 2 1 60 50 40 Operating time (s) Time Changeover Setting: 4 Operating time (s) Operating time (s) Time Changeover Setting: 1 320 280 Time scale value 10 8 6 4 2 1 240 200 160 0.7 0.6 0.5 0.4 30 120 0.3 20 80 0.2 10 40 0.1 0 100 200 300 400 500 0 600 100 SAO-S 200 300 400 500 0 600 100 200 300 400 500 600 Current (% of current SV) Current (% of current SV) Current (% of current SV) SAO-SU Operating Time Characteristics 0.7 0.6 0.5 0.4 Reset Time Characteristics 0.4 Operating time (s) 0.8 Operating time (s) Operating time (s) 0.8 0.3 0.2 0.4 0.3 0.2 0.3 0.2 0.1 0.1 0.1 0 100 200 300 400 500 600 Current (% of current SV) 0 20 40 60 80 100 Current (% of operating current) 0 100 120 140 160 180 200 Current (% of operating current) 3 SAO Installation ■ Connection Internal Circuit SAO-R SAO-R Current Sensor 3-phase 50/60 Hz R S T 4 X/C X Output relay OC 1 2 Control voltage 8 5 6 Power supply circuit − RY drive circuit 7 Overcurrent detecting circuit + Time SV circuit To all circuits Current SV circuit Tap setting circuit Rectifying circuit SET-3 Current Converter Test M OC: overcurrent LED Motor Note: There is no polarity specification when using a DC power supply. SAO-Q Current Sensor Current SV circuit AND circuit 8 OC OC: Ovecurrent LED OC OC: Ovecurrent LED SAO-SU Current Sensor SAO-SU 3-phase 50/60 Hz R S T 4 X/C − 8 NORMAL 6 X Output relay Power supply circuit 7 RY drive circuit + Overcurrent detecting circuit To all circuits Current SV circuit Tap setting circuit Rectifying circuit SET-3 Current Converter 5 1 2 Control voltage 8 7 Overcurrent detecting circuit Start-up mode time SV circuit Start-up detecting circuit Overcurrent detecting circuit Current SV circuit 7 SAO-S Current Sensor Test NORMAL: LED indicates operation. (ON for a steady current, OFF for an under current.) M Motor (A) Reset current Operating value Motor startup Output relay operation Explanation of SAO-SU Contacts 1. The contact is NC (between terminals 4 and 5) when the motor is not started. 2. The contact is NO (between terminals 5 and 6) when the startup pushbutton is pressed and a current larger than the reset current flows. 3. The contact is NC (between terminals 4 and 5) when the motor current is less than the operating value (i.e., undercurrent). ON 4 SAO ■ Connection Examples Overcurrent Detection Circuit SAO-R/SAO-Q/SAO-S R S Undercurrent Detection Circuit SAO-SU R T S Stop Stop Start T BZ Alarm buzzer BZ Alarm buzzer 6 5 4 3 7 8 1 2 Start Electromagnetic contactor Electromagnetic contactor 6 5 4 3 SAO current sensor Phase advancing capacitor SAO current sensor 7 8 1 2 SET-3 Current Converter Motor Phase advancing capacitor SET-3 Current Converter M Note: Provide the control power supply for the SAO Current Sensor from the contactor’s power supply side. If the control power supply is turned ON and the motor is started at the same time, operation inconsistent with the time SV may occur. Motor M Note: To prevent the buzzer sounding when power is turned ON, install a timer so that the buzzer sounds only when the timer’s contacts are closed. 5 SAO Operation ■ Settings Current Sensor 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 current sensor. For example, when the current setting range is 2 to 5 A, the decal no. is 0.5. Setting Operating Current SAO-R/Q LED Indicator The LED indicates that an overcurrent has occurred and the relay is operating. 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. For the SAO-R, this is the operating time in the event of a 600% overcurrent. For the SAO-Q, this is the operating time in start-up mode. There is no operating time SV for the SAO-S. 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-setting knob. oc CURRENT 7 6 8 9 5 10 4 × ×4 sec ×1 sec 0.5 A TIME 4 5 6 7 TEST 3 2 8 9 1 10 4 1 2 4 8 16 32 64 5 1.25 2.5 5 10 20 40 80 Current scale value (A) 6 7 8 9 1.5 1.75 2 2.25 3 3.5 4 4.5 6 7 8 9 12 14 16 18 24 28 32 36 48 56 64 72 96 112 128 144 10 2.5 5 10 20 40 80 160 sec SAO-R2N Time Setting Knob CURRENT SENSOR Test Button Pressing the test button momentarily operates the output relay. The LED indicator, however, does not light during this operation. Decal no. 0.25 0.5 1 2 4 8 16 SAO-S SAO-SU oc LED Indicator The NORMAL indicator is lit for normal current; not lit for undercurrent. NORMAL CURRENT CURRENT 7 6 5 SAO-S2N CURRENT SENSOR 10 × 0.5 A TEST 9 4 10 × 8 5 9 4 7 6 8 0.5 A TEST SAO-SU2N CURRENT SENSOR 6 SAO ■ Operating and Setting Procedures SAO-R, -Q, -S Make the settings for the SAO Current Sensor and the SET-3@ Current Converter according to the current of the load to be used. Steady Current Rated current (current setting range) (A) Current scale multiplying factor label number 1 to 2.5 2 to 5 4 to 10 8 to 20 16 to 40 32 to 80 Current converter Number of conductor passings Setting tap 8 4 2 1 1 1 20 20 20 20 40 80 SET-3A 1 Fixed SET-3B 0.25 0.5 1 2 4 8 64 to 160 16 Model Note: The current setting range is determined by the number of times the conductors to the SET-3@ are passed through and by the setting tap of the SET-3@. The current scale values are always 4 to 10 A. Therefore, attach the included current scale multiplying factor label to the SAO that matches the current range. Determining Current Sensor Settings 1. Determining the Current Scale Multiplying Factor The start-up lock time is a function to lock the output operation to prevent faulty operation due to unstable inputs during startup. Even when reaching the alarm output level for input status during startup*, output operation will not be performed until the set time elapses. (* Startup means when the power supply to the Sensor is turned on.) Determine a current scale multiplying factor that matches the steady current obtained from the table, and attach that decal to the Current Sensor. For example, when the current setting range is 2 to 5 A, the label number is 0.5. 5. Test Button 2. Setting the Operating Current Pressing the button momentarily operates the output relay. The LED indicator, however, does not light during this operation. Determine the operating current setting from the required steady current and the label number (i.e., multiplying factor) and make the setting using the current setting knob. The following table shows the relation between scale values and actual operating current values. Determining Current Converter Settings Setting Factor 4 5 6 7 8 9 10 × 0.25 × 0.5 ×1 ×2 ×4 ×8 × 16 1 2 4 8 16 32 64 1.25 2.5 5 10 20 40 80 1.5 3 6 12 24 48 96 1.75 3.5 7 14 28 56 112 2 4 8 16 32 64 128 2.25 4.5 9 18 36 72 144 2.5 5 10 20 40 80 160.5 1. Determining the Number of Passes for Primary Conductors • Determine the number of primary conductor passes and the setting tap according to the table. For example, for a current setting range of 2 to 5 A, the number of passes is four and the setting tap is 20. • Pass the three wires through the holes from the same direction. It doesn’t matter which wires go through which holes. The figures are steady current values. (Unit: A) 3. LED Operation Indicator The indicator is continuously lit when the Sensor operates due to overload. Note Four conductor passes One conductor pass (The conductors pass (The conductors pass through the holes four times.) through the holes once.) After detection, the operation indicator automatically turns OFF when there is no longer an overload. 4. Setting the Operating Time • Set the time setting knob to the required time. The operating time is equal to the scale value times scale multiplying factor. • The time scale multiplying factor is selected with the time scale multiplying factor switch. For the SAO-R, this is the operating time in the event of a 600% overcurrent. For the SAO-Q, this is the start-up lock time. There is no operating time setting for the SAO-S. SET-3A Scale multiplying × 1 factor Time scale value ×4 1s 2s 3s 4s 5s 6s 7s 8s 9s 10 s 4s 8s 12 s 16 s 20 s 24 s 28 s 32 s 36 s 40 s 1 2 3 4 5 6 7 8 9 10 (1) CURRENT CONVERTER No. 25053 DATE 1983 OMRON Corporation 20 (2) 40 80 MADE IN JAPAN 2. Setting the Tap Use a screwdriver to screw the included setting screw into the required tap hole. After the setting has been made, be sure to mount the cover as it was before. The SET-3B does not have tap settings. 7 SAO SAO-SU Make the settings for the SAO-SU Current Sensor and the SET-3@ Current Converter according to the current of the load to be used. Steady Current Rated current (current setting range) (A) Current scale multiplying factor label number Current converter Number of conductor passes Setting tap 8 4 2 1 1 1 20 20 20 20 40 80 SET-3A 1 Fixed SET-3B 0.25 0.5 1 2 4 8 1 to 2.5 2 to 5 4 to 10 8 to 20 16 to 40 32 to 80 64 to 160 16 Model Note: The current setting range is determined by the number of times the conductors to the SET-3@ are passed through and by the setting tap of the SET-3@. The current scale values are always 4 to 10 A. Therefore, attach the included current scale multiplying factor decal to the SAO that matches the current range. Determining Current Sensor Settings 1. Determining the Current Scale Multiplying Factor Determine a current scale multiplying factor that matches the steady current obtained from the table, and attach that decal to the Current Sensor. For example, when the current setting range is 2 to 5 A, the label number is 0.5. 2. Setting the Operating Current Determining Current Converter Settings 1. Determining the Number of Passes for Primary Conductors • Determine the number of primary conductor passes and the setting tap according to the table. For example, for a current setting range of 2 to 5 A, the number of passes is four and the setting tap is 20. • Pass the wires through the holes from the same direction. It doesn’t matter which wires go through which holes. Determine the operating current setting from the required steady current and the label number (i.e., multiplying factor), and make the setting using the current setting knob. The following table shows the relation between scale values and actual operating current values. Setting Factor × 0.25 × 0.5 ×1 ×2 ×4 ×8 × 16 4 1 2 4 8 16 32 64 5 1.25 2.5 5 10 20 40 80 6 1.5 3 6 12 24 48 96 7 8 2 1.75 4 3.5 8 7 16 14 32 28 64 56 128 112 9 10 2.5 2.25 5 4.5 10 9 20 18 40 36 80 72 160 144 These figures indicate steady current values. (Unit: A) Four conductor passes One conductor pass (The conductors pass (The conductors pass through the holes once.) though the holes four times.) (1) SET-3A CURRENT CONVERTER No. 25053 DATE 1983 OMRON Corporation 20 (2) 40 80 MADE IN JAPAN 3. LED Operation Indicator The indicator is continuously lit for normal current and not lit when undercurrent is detected. 4. Test Button Pressing the test button momentarily operates the output relay. 2. Setting the Tap Use a screwdriver to screw the included setting screw into the required tap hole. After the setting has been made, be sure to mount the cover as it was before. The SET-3B does not have tap settings. 8 SAO ■ Checking Operation The following circuit can be used to check SAO-@ and SET-3@ characteristics. 200 VAC, 3-phase, 50/60 Hz R S T CC 100 V C ± Pushbutton switch 100 VAC X X/a A A A 4 5 3 6 2 7 1 SET-3 Current Converter R R R Control voltage 8 SAO Current Sensor 3φSD: A: CC: X: R: Three-phase voltage regulator AC ammeter Cycle counter Auxiliary relay (15 A) Resistor 9 SAO Dimensions Note: All units are in millimeters unless otherwise indicated. SAO-R/SAO-Q 96 3 2 1 4 5 6 91 7 8 The Height of DIN Rail Mounting 9 10 48 12 78.5 44 9.5 100 SAO 111 SAO-S/SAO-SU 8PFA1 (order separately) 96 91 12 48 78.5 44 9.5 100 Current Converter SET-3A, SET-3B 26 Two, M3.5 terminal screws 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 52±0.5 40 4 52 60 28 73 10 SAO Precautions On Operation Connections Use a commercial frequency power supply only for the control power supply. Make sure that the polarity is correct when connecting the Current Converter and Current Sensor. It is not necessary to consider polarity when using a DC control power supply. The SET-3@ Current Converter is designed for use with a single SAO Current Sensor; do not connect two units to a single SET-3@ as in figure 1 below (even if a diode is included in the circuit). If the current transformer has sufficient capacity, the circuit in figure 2 is acceptable. Determine the necessary number of conductor runs from the table Selecting the Current Converter in the Operation section. Pass the wires through the holes from the same direction. It doesn’t matter which wires go through which holes. Figure 1: Never Use this Setup One conductor pass Four conductor passes SAO (The conductors pass through the holes once.) (The conductors pass through the holes four times.) SET Testing Method SAO Figure 2: OK with Sufficient Capacity SET CT SET Verify operation by turning on the control voltage and pressing the test button. It is possible to check whether SAO-@ and SET-3@ characteristics are correct or not with the test circuit shown on page 9. CT SAO SAO 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. Back-connecting sockets can not be used. 11 SAO Q&A Q What is the procedure for using the SAO with a single phase? The following describes the single-phase operating procedure for the SAO. Models for single-phase circuits, however, are also available. Refer to SAO-@S. Connection Procedure Run the primary wires through any two of the three holes on the SET3 the number of times specified for the SET-3@. Q Can two SAO Current Sensors be used connected to one SET-3@? If not, can a diode or other device be inserted? It is not possible to connect two SAO Current Sensors to one SET-3@. The SET-3 output is designed so that the output voltage will match when one SAO (SE) is used. Operation is not possible even with a diode inserted. Operation as shown in figure 2, however, is possible if the capacity of the CT is sufficient. Figure 1 SAO SAO SET-3@ SET-3@ Motor SAO M Setting Procedure The operating value will change when single phase is used as in the figure above. Therefore, the setting must be changed. Make the setting to approximately 0.77 times the current at which operation is desired. For example, for operation at 10 A, set the value to the following: 10 x 0.77 = 7.7 A In any case, the SAO is adjusted for three-phase use. As a precautionary measure, therefore, perform confirmation testing using the actual load. SAO SET-3@ SAO Figure 2 CT SET-3@ SET-3@ SAO SAO CT 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. 12 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. 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