SOLID-STATE RELAYS DATA SHEET page 1/12 Form 859-990514 Overview In 1974, Opto 22 introduced the first liquid epoxy-filled line of power solid-state relays (SSR). This innovation in SSR design greatly improved the reliability and reduced the cost of manufacturing. At that time, we also incorporated into our manufacturing process 100% testing of every relay produced under full load conditions. By 1978, Opto 22 had gained such a reputation for reliability that we were recognized as the world’s leading manufacturer of solid-state relays. Through continuous manufacturing improvements and the same 100% testing policy established 22 years ago, Opto 22 is still recognized today for the very high quality and reliability of its complete line of solid-state relays. Index Power Series Page Description Z Series 1 Introduction 2 All Models: General Specifications 3 120/240 Volt AC Power Series: General Specifications 4 120/240 Volt AC Power Series: Surge Current Data, Thermal Data, and Dimensions 5 480/575 Volt AC Power Series: General Specifications 6 120/240 Volt AC Power Series Plastic Package (Z Series): General Specifications 7 AC Power Printed Circuit Series: General Specifications 8 DC Switching Series: General Specifications APPLICATION TIPS 9 Heat Sink Calculation, Duty Cycle Calculation 10 Transformer Loads, Solenoid Loads, and Lamp Loads 11 Solid-State Relays in Series, Lamp Loads, Heater Loads 12 Motor Loads P Series MP Series Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: [email protected] • FaxBack: (800)474-OPTO DATA SHEET SOLID-STATE RELAYS page 2/12 Form 859-990514 Specifications All Models • 4,000 V optical isolation input to output • Zero voltage turn-on • Turn-on time: ½ cycle maximum • Turn-off time: ½ cycle maximum • Operating frequency: 25 to 65 Hz (operates at 400 Hz with six times off-state leakage) • Coupling capacitance input to output: 8 pF maximum • DV/DT Off-state: 200 volts per microsecond • DV/DT commutating: snubbed for rated current at 0.5 power factor • UL recognized • CSA certified • CE component Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: [email protected] • FaxBack: (800)474-OPTO SOLID-STATE RELAYS DATA SHEET page 3/12 Form 859-990514 Specifications AC Power Series - 120/240 Volt Opto 22 provides a full range of power series relays with a wide variety of voltage (110–575) and current options (3–45 amps). All Power Series relays feature 4,000 volts of optical isolation and have a high PRV rating. Model Number Nominal 1 cycle Nominal Nominal Signal Surge AC Line Current Input Rating (Amps) Resistance Voltage (Amps) Peak (Ohms) Signal Pick-up Voltage Peak Maximum Off-State Operating I2t Rating Signal Output Leakage Voltage Drop-out Repetitive t=8.3 Voltage Voltage (mA) Range Voltage Maximum (ms) Drop Maximum (Volts AC) Isolation Voltage θ jc* Dissipation (°C/Watt) (Watts/Amp) 120D3 120 3 85 1000 3VDC (32V allowed) 1 VDC 600 1.6 volts 2.5mA 12-140 30 4,000VRMS 11 1.7 120D10 120 10 110 1000 3VDC (32V allowed) 1 VDC 600 1.6 volts 7 mA 12-140 50 4,000VRMS 1.3 1.6 1 VDC 600 1.6 volts 7 mA 12-140 250 4,000VRMS 1.2 1.3 120D25 120 25 250 1000 3VDC (32V allowed) 120D45 120 45 650 1000 3VDC (32V allowed) 1 VDC 600 1.6 volts 7 mA 12-140 1750 4,000VRMS 0.67 0.9 1 VDC 600 1.6 volts 5 mA 24-280 30 4,000VRMS 11 1.7 240D3 240 3 85 1000 3VDC (32V allowed) 240D10 240 10 110 1000 3VDC (32V allowed) 1 VDC 600 1.6 volts 14 mA 24-280 50 4,000VRMS 1.3 1.6 1 VDC 600 1.6 volts 14 mA 24-280 250 4,000VRMS 1.2 1.3 240D25 240 25 250 1000 3VDC (32V allowed) 240D45 240 45 650 1000 3VDC (32V allowed) 1 VDC 600 1.6 volts 14 mA 24-280 1750 4,000VRMS 0.67 0.9 1 VDC 800 1.6 volts 12 mA 24-420 250 4,000VRMS 1.2 1.3 380D25 380 25 250 1000 3VDC (32V allowed) 380D45 380 45 650 1000 3VDC (32V allowed) 1 VDC 800 1.6 volts 12 mA 24-420 1750 4,000VRMS 0.67 0.9 10 VAC 600 1.6 volts 7 mA 12-140 50 4,000VRMS 1.3 1.6 120A10 120 10 110 33K 85 VAC (280 allowed) 120A25 120 25 250 33K 85 VAC (280 allowed) 10 VAC 600 1.6 volts 7 mA 12-140 250 4,000VRMS 1.2 1.3 240A10 240 10 110 33K 85 VAC (280 allowed) 10 VAC 600 1.6 volts 14 mA 24-280 50 4,000VRMS 1.3 1.6 240A25 240 25 250 33K 85 VAC (280 allowed) 10 VAC 600 1.6 volts 14 mA 24-280 250 4,000VRMS 1.2 1.3 240A45 240 45 650 33K 85 VAC (280 allowed) 10 VAC 600 1.6 volts 14 mA 24-280 1750 4,000VRMS 0.67 0.9 Notes: θjc* = Thermal resistance junction to base. Maximum junction temperature is 110°C. Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: [email protected] • FaxBack: (800)474-OPTO SOLID-STATE RELAYS DATA SHEET page 4/12 Form 859-990514 Specifications: AC Power Series - 120/240 Volt (Continued) Thermal Ratings Surge Current Data Time Time* 3-Amp 10-Amp 25-Amp 45-Amp Peak Peak Peak Peak (Seconds) (Cycles) Amps Amps Amps Amps 0.017 1 85 110 250 650 0.050 3 66 85 175 420 0.100 6 53 70 140 320 0.200 12 45 60 112 245 0.500 30 37 50 80 175 1 60 31 40 67 134 2 120 28 33 53 119 3 180 27 32 49 98 4 240 26 31 47 95 5 300 25 30 45 91 10 600 24 28 42 84 Note: *60 HZ. Dimensional Drawings Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: [email protected] • FaxBack: (800)474-OPTO SOLID-STATE RELAYS DATA SHEET page 5/12 Form 859-990514 Specifications AC Power Series - 480/575 Volt DC SERIES: The DC Series delivers isolated DC control to large OEM customers worldwide. AC SERIES: The AC Series offers the ultimate in solid-state reliability. All AC power series relays feature a built-in snubber and zero voltage turn-on. Transient proof models offer self-protection for noisy electrical environments. Nominal 1 cycle Nominal Peak Maximum Off-State Operating Signal Signal Current Surge Signal Input Pick-up Drop-out Repetitive Output Leakage Voltage Rating (Amps) Resistance Voltage Voltage Voltage Voltage (mA) Range (Amps) Peak (Ohms) Maximum Drop Maximum (Volts AC) I2t Rating t=8.3 (ms) Model Number Nominal AC Line Voltage 480D10-12 480 10 110 1000 3VDC (32V Allowed) 1 VDC 1200 3.2 volts 11 mA 100-530 50 4,000VRMS 1.2 2.5 480D15-12 480 15 150 1000 3VDC (32V Allowed) 1 VDC 1200 3.2 volts 11 mA 100-530 50 4,000VRMS 1.2 2.5 480D25-12 480 25 250 1000 3VDC (32V Allowed) 1 VDC 1000 1.6 volts 11 mA 100-530 250 4,000VRMS 1.3 1.3 480D45-12 480 45 650 1000 3VDC (32V Allowed) 1 VDC 1000 1.6 volts 11 mA 100-530 1750 4,000VRMS 0.67 0.9 575D15-12 575 15 150 1000 3VDC (32V Allowed) 1 VDC 1200 3.2 volts 15 mA 100-600 90 4,000VRMS 1.2 2.5 575D45-12 575 45 650 1000 3VDC (32V Allowed) 1 VDC 1000 1.6 volts 15 mA 100-600 1750 4,000VRMS 0.67 0.9 Isolation θjc* Dissipation Voltage (°C/Watt) (Watts/Amp) Note: θjc* = Thermal resistance junction to base. Maximum junction temperature is 110°C. Dimensional Drawings Thermal Ratings Surge Current Data Time Time*** 10-Amp 15-Amp 25-Amp 45-Amp Peak Peak Peak Peak Second (Cycles) Amps Amps Amps Amps 0.017 1 110 150 250 650 0.050 3 85 140 175 420 0.100 6 70 110 140 320 0.200 12 60 90 112 245 0.500 30 50 70 80 175 1 60 40 55 67 134 2 120 33 49 53 119 3 180 32 47 49 98 4 240 31 43 47 95 5 300 30 40 45 91 10 600 28 35 42 84 Note: ***60 HZ Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: [email protected] • FaxBack: (800)474-OPTO SOLID-STATE RELAYS DATA SHEET page 6/12 Form 859-990514 Specifications AC Power Series - 120/240 Volt Plastic Package (z series) The Z Series employs a unique heat transfer system that makes it possible for Opto 22 to deliver a low-cost, 10-amp, solid-state relay in an all-plastic case. The push-on tool-free quick-connect terminals make the Z Series ideal for highvolume OEM applications. Model Number Nominal 1 cycle Nominal Nominal Signal Surge AC Line Current Input Voltage Rating (Amps) Resistance (Amps) Peak (Ohms) Signal Pick-up Voltage Signal Drop-out Voltage Peak Maximum Off-State Operating Repetitive Output Leakage Voltage Voltage Voltage (mA) Range Maximum Drop Maximum (Volts AC) I2t Rating t=8.3 (ms) Isolation Voltage θjc* Dissipation (°C/Watt) (Watts/Amp) Z120D10 120 10 110 1000 3VDC (32V allowed) 1 VDC 600 1.6 volts 6 mA 12-140 50 4,000 VRMS 4 1 Z240D10 240 10 110 1000 3VDC (32V allowed) 1 VDC 600 1.6 volts 12 mA 24-280 50 4,000 VRMS 4 1 Notes: θ jc* = Thermal resistance junction to base. Maximum junction temperature is 110°C. Dimensional Drawings Current vs. Ambient Ratings Surge Current Data Time Second Time*** (Cycles) Peak Amps 0.017 1 110 0.050 3 85 0.100 6 70 0.200 12 60 0.500 30 50 1 60 40 2 120 33 3 180 32 4 240 31 5 300 30 10 600 28 Note: ***60 HZ Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: [email protected] • FaxBack: (800)474-OPTO SOLID-STATE RELAYS DATA SHEET page 7/12 Form 859-990514 Specifications AC Power - Printed Circuit Package (P & MP Series) Model Number 1 cycle Nominal Nominal Nominal Current Surge Signal Input AC Line Rating (Amps) Resistance Voltage Amps Peak (Ohms) Signal Pick-up Voltage Peak Maximum Off-State Operating Signal Repetitive Output Leakage Voltage Drop-out Voltage Voltage mA Range Voltage Maximum Drop Maximum (Volts AC) I2 t Rating t=8.3 (ms) Isolation Voltage Dissipation θjc* °C/Watt Watts/Amp MP120D2 or P120D2 120 2 20 1000 3VDC** (32V allowed) 1 VDC 600 1.6 volts 5 mA 12-140 2 4,000 VR M S 20 1.2 MP120D4 or P120D4 120 4 85 1000 3VDC** (32V allowed) 1 VDC 600 1.6 volts 5 mA 12-140 30 4,000 VR M S 6.5 1.2 MP240D2 or P240D2 240 2 20 1000 3VDC** (32V allowed) 1 VDC 600 1.6 volts 5 mA 24-280 2 4,000 VR M S 20 1.2 MP240D4 or P240D4 240 4 85 1000 3VDC** (32V allowed) 1 VDC 600 1.6 volts 5 mA 24-280 30 4,000 VR M S 6.5 1.2 1000 3VDC∗∗ (32V allowed) 1 VDC 800 1.6 volts 5 mA 24-420 30 4,000 VR M S 6.5 1.2 MP380D4 380 4 85 Notes: θjc* = Thermal resistance junction to base. Maximum junction temperature is 110°C. ** = MP Series 24 volts maximum. Surge Current Data 2-Amp 4-Amp Time Time* P or MP P or MP Second (Cycles) Peak Peak Amps Amps 0.017 1 20 85 0.050 3 18 66 0.100 6 15 53 0.200 12 11 45 0.500 30 9 37 1 60 8.5 31 2 120 8 28 3 180 7.5 27 4 240 7 26 5 300 6.5 25 10 600 6 24 Model P240D4 Model MP240D4 Note: *60 HZ Dimensional Drawings Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: [email protected] • FaxBack: (800)474-OPTO SOLID-STATE RELAYS DATA SHEET page 8/12 Form 859-990514 Description DC Switching Series MP Series Power Series P Series Specifications DC60P or DC60MP DC200P or DC200MP DC60S-3 DC60S-5 Operating Voltage Range 5-60 VDC 5-200 VDC 5-60 VDC 5-60 VDC Forward Voltage Drop 1.5 volts at 3 amps 1.5 volts at 1 amp 1.5 volts at 3 amps 1.5 volts at 5 amps Nominal Current Rating 3 amps 1 amp 3 amps 5 amps Off-State Blocking 60 VDC 250 VDC 60 VDC 60 VDC Signal Pickup Voltage 3 VDC 32 Volts* allowed 3 VDC 32 Volts* allowed 3 VDC 32 Volts allowed 3 VDC 32 Volts allowed Signal Dropout Voltage 1 VDC 1 VDC 1 VDC 1 VDC Signal Input Impedance Dimensional Drawings 1,000 ohms 1,000 ohms 1,000 ohms 1,000 ohms 1 Second Surge 5 amps 2 amps 5 amps 10 amps Operating Temp. Range -40° C to 100° C -40° C to 100° C -40° C to 100° C -40° C to 100° C Isolation Voltage Thermal Ratings 4,000 VRMS 4,000 VRMS 4,000 VRMS 4,000 VRMS Off-state Leakage 1 mA maximum 1 mA maximum 1 mA maximum 1 mA maximum Package Type P/MP series P/MP series Power series Power series Note: *MP series maximum allowed control signal 24 VDC. Dimensional Drawings Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: [email protected] • FaxBack: (800)474-OPTO DATA SHEET SOLID-STATE RELAYS page 9/12 Form 859-990514 Applications Tips Heat Sink Calculation Like all semiconductor devices, SSR current ratings must be based on maximum junction temperature. All Opto 22 SSRs operate conservatively at maximum junction temperatures of 110° C. Determining an adequate heat sink for a given SSR conducting a given current is very simple. Note: Thermally conductive grease must be used between the relay base and the heat sink. Sample Calculation Given: 120-Volt, 20-Amp Load 50° C Ambient Air Choose Model 120D25 SSR. Calculate dissipation as: 20 amps x 1.3 Watts per amp = 26 Watts Calculate temperature rise junction to SSR base as: 26 Watts x 1.2° C per Watt = 31.2° C Calculate allowable temperature of heat sink by subtracting 31.2° C from 110° C allowable junction temperature: 110° C-31.2 = 78.8° C The heat sink is in a 50°C ambient, therefore, allowable temperature rise on heat sink is: 78.8° C-50° C = 28.8° C If heat sink is allowed to rise 28.8° C above ambient, then the thermal resistance of the heat sink is simply the 28.8° C rise divided by the 26 Watt. Any heat sink having a thermal resistance less than 1.1° C per Watt will be adequate. Duty Cycle Calculation When solid-state relays are operated in an on/off mode, it may be advantageous to calculate the RMS value of the current through the SSR for heat sinking or determining the proper current rating of the SSR for the given application. IRMS = RMS value of load or SSR T1 = Time current is on T2 = Time current is off ION = RMS value of load current during on period 2 IRMS = (ION) x T1 T1 + T2 Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: [email protected] • FaxBack: (800)474-OPTO SOLID-STATE RELAYS DATA SHEET page 10/12 Form 859-990514 Applications Tips (Continued) Transformer Loads Solenoid Valve and Contactor Loads Careful consideration should be given to the selection of the proper SSR for driving a given transformer. Transformers are driven from positive saturation of the iron core to negative saturation of the core each ½ cycle of the alternating voltage. Large inrush currents can occur during the first ½ cycle of line voltage when a zero voltage SSR happens to turn on during the positive ½ cycle of voltage when the core is already in positive saturation. Inrush currents greater than 10 times rated transformer current can easily occur. The following table provides a guide for selecting the proper SSR for a given transformer rating. All Opto 22 SSRs are designed to drive inductive loads such as solenoid valves and electromechanical contactors. The built-in snubber in each SSR assures proper operation into inductive loads. The following table is a guide in selecting an SSR to drive a solenoid or contactor. 120-Volt Transformers SSR MODEL TRANSFORMER 120-Volt Coils SSR CURRENT RATING SOLENOID CONTACTOR 2-Amp 1-Amp NEMA Size 4 4-Amp 3-Amp NEMA Size 7 240-Volt Coils SSR CURRENT RATING SOLENOID CONTACTOR 2-Amp 1-Amp NEMA Size 7 4-Amp 3-Amp NEMA Size 7 P or MP 120D2 100 VA Z120D10 500 VA 120D3 100 VA Control Current Calculation P or MP 120D4 250 VA 120D10 or 120A10 500 VA 120D25 or 120a25 1 KVA 120D45 2 KVA All Opto 22 DC controlled SSRs have a control circuit consisting of 1000 ohms in series with an LED. Since 3 volts is required to turn on any SSR, the maximum current required is (3 volt - 1 volt) divided by 1000 ohms which equals 2.0 mA. The 1 volt is subtracted from the 3 volt signal because 1 volt is dropped across the LED. For higher control voltages, an external resistor can be added in series with the control voltage to limit the control current. To limit the control current to 2 mA, calculate the external resistor RC = 500 (EC- 3) where EC = the control voltage. 240-Volt Transformers P or MP240D2 200 VA 7240D10 1 KVA 120D3 200 VA P or MP240D4 500 VA 240D10 or 240A10 1 KVA 240D25 or 240A25 2 KVA 240D45 4 KVA The DC control voltage range is 3–32 VDC. To calculate the control current for any voltage within the 3–32 VDC range, use the formula: IC = EC - 1 1000 where RC = zero. 480-Volt Transformers SSR MODEL TRANSFORMER 480D10-12 5-Amp Primary 480D15-12 5-Amp Primary With a 5V control signal, IC = 5-1 1000 = 4 mA. Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: [email protected] • FaxBack: (800)474-OPTO SOLID-STATE RELAYS DATA SHEET page 11/12 Form 859-990514 Applications Tips (Continued) Solid-State Relays In Series In applications requiring greater current rating at higher voltage, two Opto 22 SSRs may be operated in series for double the voltage rating. The built-in snubber in each SSR assures proper voltage sharing of the two SSRs in series. In the diagram below, two 240-volt, 45-amp SSRs are connected in series for operation on a 480-volt line. The control is shown with a parallel hook-up but it should be noted that a serial connection can also be implemented. Lamp Loads Heater Loads Since all Opto 22 SSRs are zero voltage switching, they are ideal for driving incandescent lamps because the initial inrush current into a cold filament is reduced. The life of the lamp is increased when switched by a zero voltage turn on SSR. The following table is a guide to selecting an Opto 22 SSR for switching a given incandescent lamp. Care should be taken in selecting a SSR for driving a heater load if the load is cycled on and off in a continuous manner as might occur in a temperature control application. Constant cycling can cause thermal fatigue in the thyristor chip at the point where the chip bonds to the lead frame. Opto 22 employs a thick copper lead frame for mounting the SCR chips in the power series SSRs to eliminate thermal fatigue failures. In addition, Opto 22 recommends operating any SSR at 75% rated current for cycling heater loads to ensure complete reliability. 120 Volt Lamps SSR CURRENT RATING LAMP RATING 2-Amp 100 Watt 4-Amp 400 Watt 10-Amp 1 Kilowatt 25-Amp 45-Amp The following table is a guide to selecting the proper SSR for a given heater load. 2 Kilowatt Nominal SSR Current Rating Maximum Recommended Heater Current 3 Kilowatt 2-Amp 1½-Amp 4-Amp 2½-Amp 10-Amp 7½-Amp 240 Volt Rating SSR CURRENT RATING LAMP RATING 2-Amp 200 Watt 25-Amp 18-Amp 4-Amp 800 Watt 45-Amp 35-Amp 10-Amp 2 Kilowatt 10 480V 8-Amp 25-Amp 4 Kilowatt 10 480V 8-Amp 45-Amp 6 Kilowatt Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: [email protected] • FaxBack: (800)474-OPTO SOLID-STATE RELAYS DATA SHEET page 12/12 Form 859-990514 Applications Tips (Continued) Single-Phase Reversing Motor Control The circuit diagram illustrates a typical 1 Ø motor winding inductance and the phase shift capacitor can cause twice line voltage to appear across the open SSR. A 240-volt SSR should be used for a 120-Volt line. During the transition period when one SSR is turned on and the other SSR is going off, both SSRs may be on. In this case, the capacitor may discharge through the two SSRs, causing large currents to flow, which may destroy the SSRs. The addition of RL as shown will protect the SSRs from the short circuit capacitor discharge current. CALCULATE RL as: RL = 1.4 EAC 10 x SSR full load rating The resistors are unnecessary if the control circuit is designed to ensure one SSR is off before the other SSR is on. EXAMPLE: 10 amp SSR 120 V AC Line RL = 1.4 x 120 10 x 10 Three-Phase Reversing Motor Control Three-Phase Motor Control Three-phase motors may be controlled by solid-state relays as shown. A third SSR as shown is optional, but not necessary. The control windings may be connected in series or parallel. Care should be taken to ensure that surge current drawn by the motor does not exceed surge current rating of the SSR. 240-Volt 3θ θ Motors SSR MODEL = 1.7 ohm MOTOR Z240D25 1/3 HP Z240D10 3/4 HP 240D10 3/4 HP 240A10 3/4 HP 240D25 2 HP 240A25 2 HP 240D45 3 HP 480-Volt 3θ θ Motors Three-phase reversing motor control can be implemented with four SSRs as shown in the connection diagram. The SSRs work in pairs with SSR1 and SSR3 operated for rotation in one direction and SSR2 and SSR4 operated for rotation in the reverse direction. The resistor R1 as shown in the connection diagram protects against line-to-line shorts if SSR1 and SSR4 or SSR3 and SSR2 are on at the same time during the reversing transition period. Use the following table as a guide to the proper selection of an SSR for this application. Opto 22 Relay Motor Full Load Rating 3-Amp 1.25-Amp 4 ohm 50 W 8 ohm 50 W 10-Amp 5-Amp 1 ohm 100 W 2 ohm 100 W Resistor for 120V line Resistor for 240V line SSR MODEL MOTOR 25-Amp 8-Amp .5 ohm 100 W 1 ohm 100 W 480D10-12 1-½ HP 45-Amp 16-Amp .25 ohm 150 W .5 ohm 150 W 480D15-12 1-½ HP 15-Amp 5-Amp 1 ohm 100 W 2 ohm 100 W Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com Inside Sales: (800)452-OPTO • Product Support: (800)TEK-OPTO • (909)695-3080 • Fax: (909)695-3017 • E-mail: [email protected] • FaxBack: (800)474-OPTO All products and/or company names throughout this datasheet are generally trademarks or registered trademarks of their respective companies.