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Related Manuals for Rockwell Automation Allen-Bradley 700-SA
Summary of Contents for Rockwell Automation Allen-Bradley 700-SA
- Page 1 Solid-State Relays 700-SA -SC, -SE, -SF, -SH, -SK Application Guide...
- Page 2 Reproduction of the contents of this copyrighted publication, in whole or part, without written permission of Rockwell Automation, is prohibited. Throughout this manual we use notes to make you aware of safety...
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Page 3: Emc Directive
If this product has the CE mark it is approved for installation within European Communities (EC) the European Union and EEA regions. It has been designed and Directive Compliance tested to meet the following directives. EMC Directive This product is tested to meet the Council Directive 89/336/EC Electromagnetic Compatibility (EMC) by applying the following standards, in whole or in part, documented in a technical construction file:... -
Page 4: Table Of Contents
Important User Information........ii European Communities (EC) Directive Compliance ... . . iii EMC Directive . - Page 5 ON/OFF Control of a Three-phase Inductive Motor ..2-16 Forward and Reverse Operation of a Three-phase Motor ........2-16 Fail-safe Concept Power .
- Page 6 Is It Possible to Connect SSRs In a Series? ....4-6 Is It Possible to Connect Two 200V AC SSRs in Series to a 400V AC Load? .
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Page 7: Preface
Preface The purpose of this manual is to provide you with the additional information Manual Objectives necessary to apply Bulletin 700-S Solid-state Relays . Described in this manual are methods for applying and troubleshooting this product. This manual is intended for qualified personnel responsible for setting up and Who Should Use This servicing these devices. -
Page 8: Chapter 1 - Basic Concepts Of Ssrs
Chapter Basic Concepts of SSRs Overview What are SSRs? Difference between SSRs and Mechanical Relays SSRs (solid-state relays) have no movable contacts. SSRs are not very different in general operation from mechanical relays that have movable contacts. SSRs, however, employ semiconductor switching elements, such as thyristors, triacs, diodes, and transistors. -
Page 9: Configuration Of Ssrs
Basic Concepts of SSRs Configuration of SSRs Isolated input circuit Input Output terminals terminals Semiconductor output element SSR circuit configuration Output Input terminals terminals Component Configuration Power transistor (for DC loads) Thyristor (for AC loads) Triac (for AC loads) Representative Example of Switching AC Loads Input Output Light... -
Page 10: Electromagnetic Relay (Emr)
Basic Concepts of SSRs Electromagnetic Relay (EMR) An EMR generates electromagnetic force when input voltage is applied to the coil. The electromagnetic force moves the armature that switches the contacts in synchronization. EMRs are used for a wide range of applications. The principle of the operation of EMRs is simple and it is possible to manufacture EMRs at low costs. -
Page 11: On/Off Control
Basic Concepts of SSRs ON/OFF Control 9ROWDJH RXWSXW 7HPSHUDWXUH &RQWUROOHU (QDEOHV ORZFRVW QRLVHOHVV RSHUDWLRQ ZLWK UHGXFHG PDLQWHQDQFH UHTXLUHPHQWV SSR Application Examples SSRs are used for a variety of electric machines and devices SSR Classifications SSRs can be classified by appearance, such as panel-mounting models, socket models, or by applications, as shown below. - Page 12 Basic Concepts of SSRs Factory machines (e.g., molding machines) Food-related machines (e.g., packaging machines) Industrial machinery Industrial robots Industrial machines and control equipment (e.g., programmable controllers) Medical equipment (e.g., CT scanners) Physics and chemistry Physical and chemical equipment (e.g., temperature controlled baths) Automatic vending machines Automatic vending Applications...
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Page 13: Classification By Application
Basic Concepts of SSRs Classification by Application $SSOLFDWLRQ 5HFRPPHQGHG 665V Heater Control These SSRs are applicable to machines which require highly sensitive temperature control for turning heaters ON and OFF, such as molding equipment, packaging machines, and solderers. They meet the high-capacity, 700-SH 700-SE high ON/OFF frequency requirements of... -
Page 14: Ssr Glossary
Basic Concepts of SSRs SSR Glossary Terms Meaning Insulation Basic insulation Insulation for basic protection from electric shock (IEC950 1.2.9.2) Supplemental Independent insulation provided outside of basic insulation insulation to protect from electric shock when the basic insulation breaks down (IEC950 1.2.9.3) Reinforced A single-layer of insulation (IEC950 1.2.9.5) that insulation... - Page 15 Basic Concepts of SSRs Terms Meaning Output Load voltage This is the effective value for the power supply voltage that can be used for load switching or in the continuous-OFF state. Maximum load The effective value of the maximum current that can current continuously flow into the output terminals under (continuous)
- Page 16 Basic Concepts of SSRs Terms Meaning Others Inrush current A current which can be applied for short periods of time to the electrical element. Counter-electro Extremely steep voltage rise which occurs when the motive force load switched or turned OFF. Recommended The recommended load capacity which takes into applicable load...
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Page 17: Chapter 2 - Considerations When Designing Ssr Control Systems
Chapter Considerations When Designing SSR Control Systems Input Circuit Input Noise SSRs need only a small amount of input/control power to operate. This is why the input terminals must shut out electrical noise as much as possible. Noise applied to the input terminals may result in malfunction. The following describe measures to be taken against electrical pulse noise and inductive noise. - Page 18 Considerations When Designing SSR Control Systems Pulse voltage (V) Note: )RU ORZYROWDJH PRGHOV VXIILFLHQW YROWDJH PD\ QRW EH DSSOLHG WR WKH 665 EHFDXVH RI WKH UHODWLRQVKLS EHWZHHQ & 5 DQG WKH LQWHUQDO LPSHGDQFH :KHQ GHFLGLQJ RQ D YDOXH IRU 5 FKHFN WKH LQSXW LPSHGDQFH IRU WKH 665 ,QGXFWLYH 1RLVH Do not wire high voltage power lines alongside the low voltage SSR...
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Page 19: Input Conditions
Considerations When Designing SSR Control Systems Input Conditions ,QSXW 9ROWDJH 5LSSOHV When there is a ripple in the input control voltage, ensure that the peak voltage of the ripple is lower than the maximum operating SSR voltage and the root voltage is above the SSR minimum operating voltage. - Page 20 Considerations When Designing SSR Control Systems For SSRs with constant-current input circuits (e.g., 700-SH) calculation is performed at 0.1 mA. 212)) )UHTXHQF\ The ON/OFF frequency should be set to 10 Hz maximum for an AC load and 100 Hz maximum for DC load ON/OFF. If ON/OFF occurs at frequencies exceeding these values, the SSR output will not be able to follow up.
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Page 21: Output Circuit
Considerations When Designing SSR Control Systems Applicable Input Impedance for a Photocoupler-type SSR with Indicators (Example) 700-SA, -SC, -SF (With Indicators) Input current Input impedance Input voltage (V) Output Circuit AC ON/OFF SSR Output Noise Surges If there is a large voltage surge in the AC line being used by the SSR, the C/R snubber circuit built into the SSR between the SSR load terminals may not be sufficient to suppress the surge, and the SSR transient peak element voltage may be exceeded, causing overvoltage... -
Page 22: Dc On/Off Output Noise Surges
Considerations When Designing SSR Control Systems Select an element which meets the conditions in the table below as the surge absorbing element. /LQH 9ROWDJH 9DULVWRU 029 YROWDJH 6XUJH UHVLVWDQFH «9 $& « 9 $ PLQ «9 $& « 9 «9 $&... -
Page 23: Self-Holding Latching Circuits
Considerations When Designing SSR Control Systems 6HOHFWLQJ D =HQHU 'LRGH 9] < 665¶V FRQQHFWRUHPLWWHU YROWDJH 3RZHU VXSSO\ =HQHU YROWDJH YROWDJH 9 > 9] =HQHU VXUJH UHYHUVH SRZHU /RDG FXUUHQW 6DIHW\ IDFWRU WR Note: When the Zener voltage is increased (Vz), the Zener diode capacity (P ) is also increased. - Page 24 Considerations When Designing SSR Control Systems and ceramic heaters are low, an overcurrent will occur in the SSR, causing damage. For switching of all-metal and ceramic heaters, select a constant-current type SSR. Heater load Temperature Controller Input Output (voltage-output type) /DPS /RDG Large inrush current flows through incandescent lamps, halogen lamps, and so on (approx.
- Page 25 Considerations When Designing SSR Control Systems 7UDQVIRUPHU /RDG When the SSR is switched ON, an energizing current of 10…20 times the rated current flows through the SSR for 10…500 milliseconds. If there is no load in the secondary circuit of the transformer, the energizing current will reach the maximum value.
- Page 26 2-10 Considerations When Designing SSR Control Systems switching ON and OFF a load whose waves are all rectified, use a 700-SF and 700-SCT without zero cross function. 6PDOOFDSDFLW\ /RDGV Even when there is no “ON” control input signal to the SSR there is a small leakage current (I ) from the SSR output (LOAD).
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Page 27: Inrush Currents From Transformer Loads
Considerations When Designing SSR Control Systems 2-11 The supply voltage plus the charge voltage of the capacitor is applied to both ends of the SSR when it is OFF. Therefore, use an SSR model with an input voltage rating twice the size of the supply voltage. Limit the charge current of the capacitor to less than half the peak inrush current value allowed for the SSR. - Page 28 2-12 Considerations When Designing SSR Control Systems steady-state currents of the transformers satisfy the rated current requirement of each SSR. SSR Rated Current The rated current of Bulletin 700-S_ Relays is indicated in the Relays and Timers Selection Guide, pub. 700-SG003B-EN-P. Load Power Supply Voltage: 100…120 V /RDG SRZHU VXSSO\ YROWDJH ,QUXVK...
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Page 29: Transformer Tap Selection
Considerations When Designing SSR Control Systems 2-13 Transformer Tap Selection SSRs can be used to switch between transformer taps. In this case, however, be aware of voltage induced in the OFF-side SSR. The induced voltage increases in proportion to the number of turns of the winding that is almost equivalent to the tap voltage. -
Page 30: Low Ac Voltage Loads
2-14 Considerations When Designing SSR Control Systems Low AC Voltage Loads If the load power supply is used below the minimum operating load voltage of the SSR, the loss time of the voltage applied to the load will become longer than that of the SSR operating voltage range. See the following load example. -
Page 31: Application Circuit Examples
Considerations When Designing SSR Control Systems 2-15 Application Circuit Connection to a Sensor Examples The SSR connects directly to the Proximity Sensor and Photoelectric sensor Fuse or breaker Sensor Switching Control of an Incandescent Lamp Fuse or Varistor breaker Incandes- cent lamp Input signal... -
Page 32: Temperature Control Of An Electric Furnace
2-16 Considerations When Designing SSR Control Systems Temperature Control of an Electric Furnace Fuse or breaker Load heater Input signal source and INPUT Temperature Controller Forward and Reverse Operation of a Single-phase Motor Motor Fuse or breaker Note: The voltage between the load terminals of either SSR 1 or SSR 2 turned OFF is approximately twice as high as the supply voltage due to LC coupling. -
Page 33: Forward And Reverse Operation Of A Three-Phase Motor
Considerations When Designing SSR Control Systems 2-17 Forward and Reverse Operation of a Three-phase Motor Single SSRs in Combination Make sure that signals input into the SSR Units are proper if the SSR Units are applied to the forward and reverse operation of a three-phase motor. -
Page 34: Fail-Safe Concept Power
2-18 Considerations When Designing SSR Control Systems Fuse or breaker Fail-safe Concept Error Mode The SSR is an optimum switching device for high-frequency switching and high-speed switching, but misuse or mishandling of the SSR may damage the internal elements and cause operational problems. The SSR consists of semiconductor elements, and will break down if these elements are damaged by excessive surge voltage or overcurrent. -
Page 35: Short-Circuit Protection (Fuse Selection) And Overcurrent Protection
Considerations When Designing SSR Control Systems 2-19 SSR Failures /RFDWLRQ &DXVH (IIHFW WR 665 ,QSXW DUHD 2YHUYROWDJH ,QSXW HOHPHQW GDPDJH 2XWSXW DUHD 2YHUYROWDJH 2XWSXW HOHPHQW GDPDJH 2YHUFXUUHQW :KROH 8QLW $PELHQW WHPSHUDWXUH H[FHHGLQJ 2XWSXW HOHPHQW GDPDJH PD[LPXP 3RRU KHDW UDGLDWLRQ Short-circuit Protection (Fuse Selection) and Overcurrent Protection A short-circuit current or an overcurrent flowing through the load side of the SSR will damage the output switching element of the SSR. -
Page 36: Ssr Operation Indicator (Led)
2-20 Considerations When Designing SSR Control Systems SSR Operation Indicator (LED) The operation indicator turns ON when current flows through the SSR’s input/control circuit. The LED on the SSR does not indicate that the output element/device is ON. Isolation Heat Radiation Design SSR Heat Radiation Basics Triacs, thyristors, and power transistors are semiconductors that can... -
Page 37: Calculating Heat Sink Area
Considerations When Designing SSR Control Systems 2-21 external heat sinks when load current exceeds 3…6 A. When using either of these SSRs, select an ideal combination of the SSR and heat sink according to the load current. The following combinations of SSR and heat sinks are ideal: SSR Cat. -
Page 38: Designing For Control Panel Heat Radiation
2-22 Considerations When Designing SSR Control Systems Apply heat-radiation silicon or non-silicon grease between the SSR and heat sink. There will be a small space between the SSR and heat sink attached to the SSR. Therefore, the generated heat of the SSR cannot be radiated properly without the grease. -
Page 39: Operation
Chapter SSR Mounting and Installation Operation Leakage Current A leakage current flows through a snubber circuit in the SSR output circuit even when there is no input control turn-on signal present. Therefore, always turn OFF the power to the input and load and check that no current or voltage exists and it is safe before replacing or wiring the SSR. -
Page 40: Panel/Surface-Mounting Socket
SSR Mounting and Installation any other flammable material. Otherwise the heat generated by the SSR will cause the wood to carbonize, and may cause a fire. Panel/Surface-mounting Socket 0DNH VXUH WKDW WKH VXUIDFHPRXQWLQJ VRFNHW VFUHZV DUH WLJKWHQHG VHFXUHO\ ZKHQ SDQHO PRXQWHG ,I WKH 8QLW LV VXEMHFWHG WR VKRFN RU YLEUDWLRQ DQG WKH VRFNHW PRXQWLQJ VFUHZV DUH ORRVH WKH 6RFNHW DQG WKH 665 RU WKH OHDG ZLUHV PD\ GHWDFK 7KH VXUIDFHPRXQWLQJ 6RFNHWV FDQ EH VQDSSHG RQ WR WKH PP ',1 7UDFN &DW 1R '5 ... -
Page 41: Relationship Between Ssrs And Wire Ducts
SSR Mounting and Installation confirm operating conditions using the procedure detailed on page 3-4. SSR Mounting (700-SH & 700-SE) 60 (2.36) min. Vertical Mounting 30 (1.18) min. 80 (3.15) min. 10 (0.39) min. Dimensions are in mm (inches) Relationship Between SSRs and Wire Ducts Duct Depth Example 50 mm max. -
Page 42: Ventilation
SSR Mounting and Installation Ventilation Ventilation / Wire Duct Height Air Flow 50% x h Max Duct Clean air inlet filter regularly, if one is used. If the air inlet or air outlet has a filter, clean the filter regularly to prevent it from clogging and ensure an efficient flow of air. -
Page 43: Operation And Storage Environment Precautions
SSR Mounting and Installation Ambient Temperature Measurement Conditions a. Measure the ambient temperature under the power application conditions that will produce the highest temperature in the control panel and after the ambient temperature has stabalized. b. Refer to Figure 1 for the measurement position. If there is a duct or other equipment within the measurement distance of 100 mm, refer to Figure 2. -
Page 44: Operation And Storage Locations
SSR Mounting and Installation Operation and Storage Locations Do not operate or store the SSR in the following locations. Doing so may result in malfunction or deterioration of performance specifications. ‡ /RFDWLRQV VXEMHFW WR GLUHFW VXQOLJKW ‡ /RFDWLRQV VXEMHFW WR FRUURVLYH RU IODPPDEOH JDVHV ‡... - Page 45 SSR Mounting and Installation The SSR is a high-precision component. Do not drop the SSR or subject it to excessive vibration or shock regardless of whether the SSR is mounted or not. The maximum vibration and shock that an SSR can withstand varies with the model.
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Page 46: What Is Zero Cross Function
Chapter Q & A The zero cross function turns ON the SSR when the AC load voltage is What Is The Zero close to 0 V, thus suppressing the noise generation of the load when Cross Function? the load current rises quickly. The generated electrical noise will be partly imposed on the power line and the rest will be released in the air. -
Page 47: Why Does The Input Current Vary With The Ssr
Q & A Due to design characteristics, a SSR with photocoupler isolation has Why Does the Input Current different input current requirements from an SSR with phototriac Vary With the SSR? isolation. An SSR with photocoupler isolation does not require as high an input current as a phototriac ensures efficient signal transmission. -
Page 48: What Are The Characteristics Of Thyristors And Triacs
Q & A (rate of change) of thyristors is larger than that of triacs. Triacs can switch inductive motor loads that are as high as 3.7 kW. Furthermore, a single triac can be the functional equivalent of a pair of thyristors connected back-to-back and can thus be used to contribute to downsizing SSRs. -
Page 49: Are There Any Ssrs With Normally Closed Contacts
Q & A semiconductor elements is called the critical rate-of-rise of the OFF-state voltage (or static dv/dt). The limit value that cannot turn OFF the output semiconductor elements is called commutation dv/dt. A snubber circuit suppresses surge. If the surge voltage is high, however, the output semiconductor elements will be damaged. -
Page 50: What Is The Difference Between Recommended
Q & A The maximum load current of an SSR is determined on the What Is the Difference assumption that the SSR is used independently connected to a Between Recommended resistive load. Values and Rated Values? A 20 to 30% safety margin will be required if an inductive load, such as a transformer or motor, is used due to the inrush current that will flow. -
Page 51: Why Does The Operating Time Vary Between Ac Inputs
Q & A 6+B $ Note: Refer to pub. 700-SG003B-EN-P for a complete list of values. An SSR with an AC input has a rectification circuit. A capacitor is Why Does the Operating included in the rectification circuit. The operating time of the SSR will Time Vary Between AC be slower than an SSR with a DC input due to the charge time of the Inputs and DC Inputs? -
Page 52: Is It Possible To Connect A Dc Output Load To A Negative Electrode? Can Either A Positive Or Negative Load Be Connected
Q & A is not possible to increase the load current by connecting the SSRs in parallel. If an ON-state SSR in operation is open, the other SSR will turn ON when the voltage is applied, thus maintaining the switching operation of the load. -
Page 53: Why Is The Minimum Load Current For Most Ssrs
Q & A Triac or transistor output elements have a minimum holding current. Why Is the Minimum Load Considering the ambient operating temperature, the minimum load Current for Most SSRs current based on the minimum holding current is 0.1 A. Limited to 0.1 A? If the load current is less than 0.1 A, the output element cannot maintain the ON-status of the load. -
Page 54: Switched With A Ssr
Q & A A SSR has a leakage current whether or not the input of the SSR is ON Why Does a Relay or OFF. If a small relay is driven by the SSR, the relay coil will be Sometimes Make A Buzzing slightly energized. -
Page 55: Can A Panel Frame Be Used In Place Of Heat Sink
4-10 Q & A Bleeder Resistor Values 9 $& « NΩ 9 $& « NΩ : How Much Thermal Thermal Resistance of Heat Sinks Resistance Is Required in &DW 1R 7KHUPDO 5HVLVWDQFH the Heat Sink? What Is the 6 ƒ... -
Page 56: Why Is It Necessary To Apply Grease To The Ssr/Heat Sink
Q & A 4-11 See the following table for heat radiation for aluminum plates. &DW 1R &DUU\ FXUUHQW 5HTXLUHG DOXPLQXP SODWH VL]H PP 6( 1RW UHTXLUHG × × 6+ 6( $ × × ×... -
Page 57: What Output Configuration Is Suitable When The Ssr Is Used In Combination With A Temperature Controller
4-12 Q & A Use a SSR in combination with a temperature controller with a voltage What Output Configuration output. Is Suitable When the SSR Is Used in Combination With a Temperature Controller? Refer to the diagrams below for the number of SSRs that can be What Precautions Are connected to an Allen-Bradley temperature controller. -
Page 58: Examples Of Connections Between Temperature Controllers
Q & A 4-13 Examples of Connections Between Temperature Controllers and SSRs /RDG )XVH RU EUHDNHU +HDWHU 9ROWDJH RXWSXW WHUPLQDOV ZLWK /RDG SRZHU VXSSO\ INPUT LOAD 665 GULYH RXWSXW 'LUHFW FRQQHFWLRQ SRVVLEOH 7HPSHUDWXUH FRQWUROOHU ZLWK 9 '& RXWSXW DW P$ 7& 7HPSHUDWXUH &RQWUROOHU ZLWK 9 '&... -
Page 59: What Precautions Are Necessary For Forward/Reverse Operation Of A Single-Phase Motor
4-14 Q & A Refer the following table for the protection of capacitor motors driven What Precautions Are by SSRs: Necessary For 6LQJOHSKDVH /RDG FXUUHQW RI UHFRPPHQGHG 3URWHFWLRQ RI PRWRU LQ Forward/Reverse Operation 9 IRUZDUGUHYHUVH RSHUDWLRQ of a Single-phase Motor? Ω : : $&... -
Page 60: Does An Ssr Have A Mounting Direction
Q & A 4-15 An SSR consists of semiconductor elements. Therefore, unlike Does an SSR Have a mechanical relays that incorporate movable parts, gravity changes Mounting Direction? have no influence on the characteristics of the SSR. Changes in the heat radiation of an SSR may, however, limit the carry current of the SSR. -
Page 61: What Is The Non-Repetitive Inrush Current
4-16 Q & A Publication 700-SG003B-EN-P gives the non-repetitive inrush current What Is the Non-Repetitive values for the SSR. The concept of the non-repetitive inrush current of Inrush Current? an SSR is the same as an absolute maximum rating of an element. Once the inrush current exceeds the level of the non-repetitive inrush current, the SSR will be destroyed. -
Page 62: Is It Possible To Replace A Defective Part In A Ssr
Q & A 4-17 The 700-SCZY, -SCTY, -SCTN, and SCZN SSR does not incorporate a varistor. These SSRs with 200V AC output withstand a maximum of 264V AC. The output triac of the SSR in actual operation will be destroyed due to an overvoltage of approximately 600V AC, provided that the AC is a sine wave current with no distortion or noise. - Page 63 Chapter SSR Troubleshooting Flowcharts 7KH 665 PD\ EH 7KH 665 FDQ DGYHUVHO\ DIIHFWHG E\ QRW EH XVHG WKH UHVLGXDO YROWDJH ,V WKH LQSXW DW WKH SUHYLRXV VWDJH XQOHVV D VLQH D OHDNDJH FXUUHQW RU LQGLFDWRU 2))" ZDYH FXUUHQW LV LQGXFWLYH QRLVH WKURXJK WKH LQSXW VXSSOLHG OLQH...
- Page 64 SSR Troubleshooting Flowcharts 7KH 665 KDV D IDLOXUH VXFK DV D ORDG VKRUW FLU FXLW RU H[WHUQDO <HV VXUJH IDLOXUH 'RHV WKH LQUXVK ,V WKH ORDG RQH ,V WKH ORDG D FXUUHQW H[FHHG ZLWK D KLJK LQUXVK )RU $& <HV PLQXWH RQH WKH PD[LPXP FXUUHQW VXFK DV D...
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Page 65: Appendix
Appendix Technical Information Use the following table for reference when selecting the load of your List of SSR. The data in this table are all measured at an SSR ambient Recommended temperature of 25°C or 40°C. Load current applied to SSR should be Loads considered at ambient temperature. -
Page 66: Circuit Configuration
Technical Information Circuit Configuration /RDG =HUR &URVV ,QVXODWLRQ &LUFXLW &RQILJXUDWLRQ &DW 1R 6SHFLILFDWLRQV )XQFWLRQ 6+B B*$ Photocoupler 6&=< Triac Snub- Zero Input Output Input <HV 3KRWRFRXSOHU Trigger 6&=1 cross terminals terminals circuit circuit circuit circuit 6)= 6$= 6.21 6(B B B1 Phototriac coupler $&... - Page 67 $EVRUSWLRQ HOHPHQW $XWRPDWLRQ EOHHGHU UHVLVWDQFH & &5 VQXEEHU FLUFXLW &DOFXODWLQJ +HDW 6LQN $UHD &DSDFLWLYH /RDG &LUFXLW &RQILJXUDWLRQ DSSHQGL[ &ODVVLILFDWLRQ E\ $SSOLFDWLRQ &ODVVLILFDWLRQV FRPPXWDWLRQ GYGW &RQVLGHUDWLRQV :KHQ 'HVLJQLQJ 665 &RQWURO 6\VWHPV FRXQWHUHOHFWURPRWLYH IRUFH &RXQWHUPHDVXUHV IRU /HDNDJH &XUUHQW GLRGH ...
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