10 years Interface relays warranty Interface Relays Introduction Delcon was founded in 1975 as a specialist manufacturer of solid state interface relays. Our relay design utilizes pulse transformer technology which gives unique advantages over traditional opto coupler based solid state relays and electro mechanical relays. This helps ensure a long lifetime and trouble free performance in harsh industrial applications where difficult loads, noise and interference can cause big problems. Delcon has distributors in more than 20 countries. The largest customer segments are the energy industry, cargo handling at ports, as well as the pulp and paper industry. Delcon’s customers include a number of companies that are the market leaders in their own fields. Problems with interference Problems with signaling • Power cables installed adjacent to signal cables, especially over long cable runs, create a capacitive effect that can cause opto coupler/electro mechanical relays to switch on or remain on after the control signal switches off • Electrical disturbances can cause the LED indicator of the opto coupler / electromechanical relays to glow when the relay is switched off and no input signal present. This makes it difficult to quickly diagnose faults and rectify problems • Transients in the power supply causes damage to relay coils/ opto coupler relays • Interference from frequency inverters can provide false on/off switching Solution Delcon relays have built in capacitive suppression to allow safe, reliable operation even with very long cable runs. An RC circuit protects the relays from transients and high frequency interference. Hysteresis Puls transformer Output Protection circuitSwitch on Switch off I U y Current mA Interference Suppression Solution The Delcon LED is synchronized with the output so it is impossible for it to glow without being on. The relays have good hysteresis with clearly defined on / off points for reliable operation in high noise environments. ela lr a nic ha ec M n o elc y la re D Opto r relay couple Voltage V Interface Relays Problems with inductive loads Problems with high dc voltage • Contactors and solenoid valves are commonly used throughout the industry, they are also problematic inductive loads for electromechanical relays to handle • Reduced switching capacity • Contacts weld • Electromechanical relays are significantly derated at higher dc voltages • Usually require special version electromechanical relays that are physically bigger and take up more space • Short lifetime Solution Delcon AC output relays are rated at 3A and can switch inductive loads without any derating. Delcon DC output relays have no derating up to 24Vdc and thereafter still offer significantly less derating compared to electromechanical relays. Solution Delcon dc output relay types CRA & CRA4 can switch up to 300Vdc with no derating compared to electromechanical relay and in a smaller package. Example SLO24CRA4 switching 40ms inductive load at 3A / 110Vdc will give service life of 15 years or more. 10 E-mech relay resistive loads, DC1 E-mech relay inductive loads, L/R 40 ms Delcon relay inductive loads, L/R 50 ms Amps. 1 0,1 Volts 0 25 75 125 www.weidmuller.com 175 225 275 325 Weidmuller, USA | 800.849.9343 | [email protected] Weidmuller, Canada | 800.268.4080 | [email protected] Weidmuller, Mexico | 01.222.2686267 | [email protected] 375 Interface Relays Changing relays is a costly business Compared to the total system cost, a relay is a relatively inexpensive component. However, a relay that fails in a system runs the risk of becoming the most expensive component. Choosing a relay with a shorter life span than the entire system will probably result in costly unwanted system downtime! The life span of an industrial system is typically considered to be 15 years. If your application has any of the following requirements then select Delcon relays for a hassle free and safe operation that spans the entire system life. • Frequent switching - relays operate at least once per minute • Inductive loads – fitting clamp diodes can help but increases switch off time • Inductive loads combined with high switching frequency • High dc voltages Cost of Delcon Cost of third replacement Cost of E-Mech relay Cost of first replacement Cost of second replacement Cost Cost of downtime ce Cost pri n o Delc ce Cost pri lay re h c e E-M 9 year Lifetime 6 year 3 year Choosing Delcon relays for your system will improve your long term profitability. The cost of system downtime differs depending on the type of industry but is usually very expensive. If we consider only the cost of trouble shooting and replacing a faulty relay for the first time then the initial cost of choosing Delcon is already exceeded. Delcon is the default choice in many Scandinavian paper mills which is a well known, tough industrial environment. These customers choose Delcon for reliable, safe operation and long term cost savings through minimal maintenance and avoiding costly downtime. Interface Relays Quick guide CR CRP • • • • AC input relays Long signal cables (> 100 m) Parallel signal & load cables Radio frequency noise Transient noise CR • 2 wire sensor version for leakage current immunity up to 3.5mA CRP • Parallel signal & load cables • Radio frequency noise • Transient noise DC input relays TR AC output relays • High switching frequency TRA • high switching frequency • resistive loads • inductive loads CR DC output relays • Motor control CRA & CRA4 • high switching frequency • resistive loads • inductive loads • high DC-loads IRA AC/DC output relays • all AC- and DC-loads • high switching • 0,5 ms off-delay •Sockets • 16 channel base • PLC adapter •Cables Accessories For more information please call or visit our website www.delcon.fi www.weidmuller.com Weidmuller, USA | 800.849.9343 | [email protected] Weidmuller, Canada | 800.268.4080 | [email protected] Weidmuller, Mexico | 01.222.2686267 | [email protected] Interface Relays Input relays for AC • • • • Galvanic isolation 4 kV, 8 mm creep distance Effective interference elimination Compatible with NPN/PNP logic LED indication General description The relays are used as an interface between AC sensors and control systems. The integrated interference protection provides reliable operation even in very demanding electrical environments. Thanks to interference protection, signal cables can be run alongside power cables on, for example, cable racks for more than 1.5 km without capacitive cross-talk affecting relays. The relays have no mechanical parts, which provides very reliable application. The CRP models are especially designed for connecting to 2-wire sensors that generate leakage current. The CRP relays are blind to leakage currents up to 3.5 mA. Technical data (Values at +25 °C) PRIMARY CIRCUIT Input voltage nom. Input voltage max. Power consumption max. Input impedance typical Activation voltage typical Drop-out voltage typical Drop-out current typical SECONDARY CIRCUIT Load voltage max. Voltage drop at max. load typical Load current max. Activation time typical Drop-out time typical Operating temperature *The socket is securely fitted to the relay. SLI25CR 24 V AC 32 V AC 15 mA 2 kΩ 16 V AC 14 V AC SLI120CR 120 V AC 140 V AC 7 mA 20 kΩ 80 V AC 60 V AC SLI120CRP 120 V AC 140 V AC 8 mA 17 kΩ 80 V AC 60 V AC 3.5 mA SLI230CR 230 V AC 265 V AC 6 mA 45 kΩ 170 V AC 110 V AC 0-60 V DC 0.2 V DC 50 mA 20 ms 60 ms 0-60 V DC 0.2 V DC 50 mA 50 ms 50 ms 0-60 V DC 0-60 V DC 0.2 V DC 0.2 V DC 50 mA 50 mA 20 ms 50 ms 40 ms 50 ms See table below SLI230CRP 230 V AC 265 V AC 7.5 mA 35 kΩ 170 V AC 140 V AC 3.5 mA SLI380CRS* 400 V AC 440 V AC 5 mA 80 kΩ 320 V AC 220 V AC 0-60 V DC 0.2 V DC 50 mA 40 ms 40 ms 0-60 V DC 0.2 V DC 50 mA 50 ms 50 ms DimensionsConnections MIS 1N 06339999 12,8 13( +) 38 (74 mm with relay) 13 14 A1( +/~) 14(-) 5 4 2 1 Control side A2(-/~) Field side 80,6 AC input module Ambient temperature is defined as the temperature in direct proximity to the relays. The surface temperature of the relay (measured at the Ambient temperature -25 °C to +40 °C +40 °C to +55 °C +55 °C to +70 °C Applies to All input relays 120 V AC and 230 V AC relays Relays with voltages from 48-230 V AC middle of the relay’s top surface) must be kept under 70-75 °C for a long lifetime. Each 10 °C increase halves the lifetime of the relay. Limitations None Only every other module should be constantly activated when the relays are mounted beside one another. If the modules are in the activated state the majority of the time, the modules must be 12.5 mm apart. On a mounting base, every other position must be empty. Ordering guide Part number Description Input Output SLI25CR SLI120CR SLI230CR SLI120CRP SLI230CRP SLI380CRS MIS1GN JUMPER 16-13 Input relay Input relay Input relay Input relay Input relay Input relay Socket for input relays. Standard Jumper bar for Delcon’s sockets, max. 24 V AC 120 V AC 230 V AC 120 V AC 230 V AC 400 V AC 0-60 0-60 0-60 0-60 0-60 0-60 16/bar. V V V V V V Mounting DC/50 DC/50 DC/50 DC/50 DC/50 DC/50 mA mA mA mA mA mA Plug-in Plug-in Plug-in Plug-in Plug-in Plug-in DIN rail Interface Relays Input relays for DC • • • • Galvanic isolation 4 kV, 8 mm creep distance Effective interference elimination Compatible with NPN/PNP logic LED indication General description than 1.5 km without capacitive cross-talk affecting relays. The relays have no mechanical parts, which provides very reliable application. If high frequencies occur from sensors for counting inputs, for example, we recommend SLI24CRF. The relays are used as an interface between DC sensors and control systems. The integrated interference protection provides reliable operation even in very demanding electrical environments. Thanks to interference protection, signal cables can be run alongside power cables on, for example, cable racks for more Technical data (Values at +25 °C) PRIMARY CIRCUIT Input voltage Input voltage Power consumption Input impedance Activation voltage Drop-out voltage SECONDARY CIRCUIT Load voltage Voltage drop at max. load Load current Activation time Drop-out time Operating temperature nom. max. max. typical typical typical SLI12CR 12 V DC 18 V DC 7.5 mA 1.8 kΩ 7.5 V DC 6 V DC SLI24CR 24 V DC 32 V DC 7 mA 4 kΩ 16 V DC 14 V DC SLI24CRF 24 V DC 32 V DC 8 mA 4 kΩ 16 V DC 14 V DC SLI48CR 48 V DC 70 V DC 7 mA 8 kΩ 36 V DC 26 V DC max. typical max. typical typical 0-60 V DC 0.2 V DC 50 mA 0.3 ms 0.3 ms 0-60 V DC 0.2 V DC 50 mA 0.3 ms 0.5 ms 0-60 V DC 0-60 V DC 0.2 V DC 0.2 V DC 50 mA 50 mA 5 µs 0.3 ms 20 µs 0.5 ms -25 °C to +70 °C SLI125CR 125 V DC 140 V DC 4.2 mA 31 kΩ 80 V DC 60 V DC SLI250CR 250 V DC 265 V DC 4 mA 68 kΩ 170 V DC 110 V DC 0-60 V DC 0.2 V DC 50 mA 0.5 ms 0.5 ms 0-60 V DC 0.2 V DC 50 mA 0.5 ms 0.5 ms DimensionsConnections MIS 1N 06339999 12,8 13( +) 38 (74 mm with relay) 13 14 14(-) A1( +/~) 5 4 2 A2(-/~) 1 Control side Field side 80,6 Ordering guide Part number Description SLI12CR Input relay SLI24CR Input relay SLI24CRF Input relay, high frequency 10 kHz. SLI48CR Input relay SLI125CR Input relay SLI250CR Input relay MIS1GN Socket for input relays. Standard JUMPER 16-13 Jumper bar for Delcon’s sockets, max. N/C relays also available upon request. Input 12 V DC 24 V DC 24 V DC 48 V DC 125 V DC 250 V DC Output 0-60 V DC/50 0-60 V DC/50 0-60 V DC/50 0-60 V DC/50 0-60 V DC/50 0-60 V DC/50 mA mA mA mA mA mA Mounting Plug-in Plug-in Plug-in Plug-in Plug-in Plug-in DIN rail 16/bar. www.weidmuller.com Weidmuller, USA | 800.849.9343 | [email protected] Weidmuller, Canada | 800.268.4080 | [email protected] Weidmuller, Mexico | 01.222.2686267 | [email protected] Interface Relays Input relays for AC • • • • Galvanic isolation 4 kV, 8 mm creep distance 3 A inductive or resistive load Effective interference elimination LED indication General description The relays are used as an interface between control systems and AC loads. The relays can handle inductive loads without load current reduction, which makes them very suitable for connection to, for example, solenoid valves and contactors. The relays have no mechanical parts, which means very reliable application. The integrated interference protection provides reliable operation even in very demanding electrical environments. Thanks to interference protection, signal cables can be run alongside power cables on, for example, cable racks for more than 1.5 km without capacitive cross-talk affecting relays. The SLOP models are especially designed for connection to 2-wire sensors that produce leakage current. The relays are blind to leakage currents up to 3.0 mA. For forward/reverse control of AC motors, the SLO24TRA is used. The relay has a higher operating voltage and withstands regenerated voltages from motors. Technical data (Values at +25 °C) PRIMARY CIRCUIT Input voltage Input voltage Power consumption Input impedance Activation voltage Drop-out voltage Drop-out current SECONDARY CIRCUIT Load voltage Voltage drop at max. load Load current Peak current, max. 20 ms Leakage current Activation time Drop-out time Operating temperature nom. max. max. typical typical typical SLO5TR 5 V DC 7 V DC 17 mA 0.3 kΩ 2.7 V DC 2.5 V DC SLO24TR 24 V DC 32 V DC 17 mA 1.6 kΩ 16 V DC 14 V DC SLO24IRA 24 V DC 32 V DC 15 mA 2 kΩ 16 V DC 14 V DC SLOP120TR 120 V AC 140 V AC 6 mA 24 kΩ 80 V AC 65 V AC 3 mA SLOP230TR 230 V AC 265 V AC 6 mA 46 kΩ 170 V AC 110 V AC 3 mA SLO24TRA 24 V DC 32 V DC 17 mA 1.4 kΩ 16 V DC 14 V DC max. 0-265 V AC 0-265 V AC 0-265 V AC 0-300 V DC 0-265 V AC 0-265 V AC typical max. 1V 3A 90 A 2 mA 0.5 ms 11 ms 1V 3A 90 A 50 µA 0.5 ms 11 ms 1.5 V 1V 1.2 A 3A 8A 90 A 50 µA 2 mA 0.3 ms 10 ms 0.3 ms 20 ms See the technical information. 0-265 V AC motor loads 0-460 V AC static loads 1V 2.5 A 65 A 50 µA 0.5 ms 11 ms typical typical typical 1V 1.5 A 90 A 2 mA 10 ms 20 ms DimensionsConnections MOS 1N 06339999 12,8 A1(+) 38 (74 mm with relay) 13 14 13(+/~) A2(-) 14(-/~) 4 3 2 1 Control side Field side 80,6 Ordering guide Part number SLO5TR SLO24TR SLO24IRA Description Output relay Output relay Output relay Input 5 V DC 24 V DC 24 V DC SLOP120TR SLOP230TR SLO24TRA Output relay Output relay Output relay 120 V AC 230 V AC 24 V DC MOS1GN JUMPER 16-13 Socket for output relays. Standard Jumper bar for Delcon’s sockets, 16 way strip. Output 0-265 V AC/3 A 0-265 V AC/3 A 0-300 DC or 0-265 V AC/1.2 A 0-265 V AC/3 A 0-265 V AC/1.5 A 0-265 V AC Motor load 0-460 V AC Static load Mounting Plug-in Plug-in Plug-in Plug-in Plug-in Plug-in Din rail Interface Relays Input relays for DC • • • • Galvanic isolation 4 kV, 8 mm creep distance Effective interference elimination Compatible with NPN/PNP logic LED indication General description The relays are used as interfaces between control systems and DC loads. The relays handle inductive loads and high DC voltages with low load reduction compared to mechanical relays, which provide a long lifetime. If a diode is mounted across a load, such as 1N4007, the nominal current applies, even with high inductive loads. (Keep in mind that the drop-out time increases when mounting a diode.) The relays have no mechanical parts, which means very reliable application. The integrated interference protection provides reliable operation even in very demanding electrical environments. Thanks to interference protection, signal cables can be run alongside power cables on, for example, cable racks for more than 1.5 km without capacitive cross-talk affecting relays. Technical data (Values at +25 °C) PRIMARY CIRCUIT Input voltage nom. Input voltage max. Power consumption max. Input impedance typical Activation voltage typical Drop-out voltage typical SECONDARY CIRCUIT Load voltage max. Voltage drop at typical max. load Load current max. Peak current max. 10 ms Activation time typical Drop-out time typical Operating temperature SLO5CR 5 V DC 15 V DC 15 mA 420 kΩ 2.7 V DC 2.5 V DC SLO24CR 24 V DC 32 V DC 15 mA 2 kΩ 16 V DC 14 V DC SLO24CRA 24 V DC 32 V DC 15 mA 2 kΩ 16 V DC 14 V DC SLO24CRA4 24 V DC 32 V DC 15 mA 2 kΩ 16 V DC 14 V DC SLO24CRX 24 V DC 32 V DC 15 mA 2 kΩ 16 V DC 14 V DC SLO120CRA 120 V DC 140 V DC 4 mA 34 kΩ 80 V DC 60 V DC SLO120CRA4 120 V DC 140 V DC 4 mA 34 kΩ 80 V DC 60 V DC SLO220CRA 220 V DC 250 V DC 4 mA 63 kΩ 170 V DC 120 V DC SLO220CRA4 220 V DC 250 V DC 4 mA 63 kΩ 170 V DC 120 V DC 0-60 V DC 0-60 V DC 0-300 V DC 0-300 V DC 0.5 V DC 0.5 V DC 1.5 V DC 0.8 V DC 0-32 V DC 0.4 V DC 0-300 V DC 1.5 V DC 0-300 V DC 0.8 V DC 0-300 V DC 1.5 V DC 0-300 V DC 0.8 V DC 3A 3A 1.8 A 4A 10 A 1.8 A 4A 1.8 A 4A 15 A 15 A 12 A 20 A 80 A 12 A 20 A 12 A 20 A 0.3 ms 0.3 ms 0.3 ms 0.3 ms 0.3 ms 0.3 ms 0.3 ms 0.3 ms 0.5 ms 0.5 ms 0.3 ms 0.3 ms 0.5 ms 0.5 ms See the general technical information. 0.5 ms 0.5 ms 0.5 ms 0.5 ms 13 14 MOS 1N 06339999 38 (74 mm with relay) DimensionsConnections A1(+) 13(+/~) A2(-) 14(-/~) 4 3 2 1 Control side 12,8 Field side 80,6 Ordering guide Order number Description Input Output SLO5CR Output relay 5 V DC 0-60 V DC/3 A SLO24CR Output relay 24 V DC 0-60 V DC/3 A SLO24CRA4 Output relay 24 V DC 0-300 V DC/4 A SLO24CRA Output relay 24 V DC 0-300 V DC/1.8 A SLO24CRX* Output relay 24 V DC 0-32 V DC/10 A SLO120CRA Output relay 120 V DC 0-300 V DC/1.8 A SLO120CRA4 Output relay 120 V DC 0-300 V DC/4 A SLO220CRA Output relay 120 V DC 0-300 V DC/1.8 A SLO220CRA4 Output relay 220 V DC 0-300 V DC/4 A MOS1GN Socket for output relays. Standard JUMPER 16-13 Jumper bar for Delcon’s sockets, max. 16/bar. * For mounting in socket MOS1GN or MBS16, 6.3 A applies. For solder connection in socket 10A order no. SLO24CRXS. www.weidmuller.com Mounting Plug-in Plug-in Plug-in Plug-in Plug-in Plug-in Plug-in Plug-in Plug-in Weidmuller, USA | 800.849.9343 | [email protected] Weidmuller, Canada | 800.268.4080 | [email protected] Weidmuller, Mexico | 01.222.2686267 | [email protected] Interface Relays Delcon’s unique interface relays Field of application Delcon’s interface relays are designed to withstand tough industrial environments. Reliable activation and drop out, very high interference immunity, 4 kV isolation and high load currents provide a maintenance-free process with low service costs and reliable operation. Lifetime is estimated at up to 20 years, depending on the type. Interference Suppression Interference Suppression Puls transformer Hysteresis I Hysteresis Puls transformer Puls transformer Hysteresis Output Interference circuit Protection Hysteresis Output circuit Protection Transient & High Frequency Suppression The relays have integrated protection against transients and EMI can occur on the primary side. I that U nce sion Interference Suppression Hysteresis I InterferenceOutput Suppressioncircuit Puls transformer Hysteresis Protection Puls transformer Switching Points & Hysteresis The relays have defined activation and drop-out points. I Uvoltage and drop Puls at 2/3 of the U Output Activation occurs nominal Hysteresis Protection transformer circuit out occurs at 1/2 of the nominal voltage. Current hysteresis entails that the relay’s impedance is changed at the activation point; less current is required to hold the relay I U in the activated position. The two functions above ensure a hysteresis between the activation and drop-out point. Activation and drop out are always reliably conducted, even in environments with high interference. The diagram shows the change-over levels/hysteresis for Delcon’s interface relays compared with mechanical relays and optocouplers. C u r re n t mA On Of f De Re Protection Puls transformer Output circuit Protection Pulse transformer Delcon uses a pulse transformer for transmission of the signal from the primary to secondary side, resulting in high energy transfer. This permits the use of heavy duty output components of high quality. In comparison with an optocoupler, which utilises the load side for supply to the internal electronics, the pulse transformer and Delcon’s circuit solution offer many benefits: • Creep distance of 8 mm • 4 kV isolation • Very low leakage current • No demand for min. load • High immunity to load transients • High load currents • High dV/dt values Output circuit Protection Solid State Switch & Protection Components AC output TRIAC output semi-conductor. Thanks to the pulse transformer’s strong signal transmission, TRIACs can be used that are less sensitive to rapid load voltage (dV/dt) rise/fall times. Sensitive TRIACs can be activated by rapid voltage changes. This problem is eliminated with Delcon’s interface relays. The SLO24TR standard relay has very low leakage current (0.05 mA) and has varistor protection against load transients. Other AC relays have varistors and RC protection on the secondary side. No minimum load is required and all modules have a wide voltage range. The relays can handle resistive and inductive loads without load currents needing to be reduced. DC output Power MOSFET output semi-conductor. Available for load currents up to 10A in the same compact casing. Transient protection is provided by a zener diode or varistor, which entails that there is no leakage current. Low reduction of load current for inductive loads compared with mechanical relays. Voltage /current - signal diagram n lco Output circuit U Suppression Capacitive Suppression When power cables with AC voltage are installed alongside I a signal cable, aUcapacitance occurs between the cables. I U This capacitance creates an undesired current in the signal cable that can affect optocouplers/mechanical relays so that they are activated or do not disconnect when the control signal ceases. Delcon’s relays have integrated protection that prevents capacitive cross-talk from incorrectly activating relays. Installation of power cables beside unshielded signal cables for long distances (>1.5 km) is therefore feasible. Interference Suppression Interference protection Delcon’s interface relays have interference protection in several layers that effectively prevent false signals from affecting the relays. Only actual control signals pass through the filter. lay elay cal R ha ni c e er t ro m coupl El e c Opto Voltage DC Interface Relays Operating temperature output modules The permitted load is linearly reduced to 1/3 from +30 °C to +70 °C ambient temperature (the ambient temperature must be measured immediately adjoining the relays). When the output modules are mounted close together, the maximum load should not be more than 50 percent for an extended period. In other words, all modules constant to and including 50 % load,or half of the modules with 100 % load or all with 100 % load half the time. This provides maximum lifetime. If there is a 12.5 mm gap between the modules, these restrictions do not apply. AC output relays with AC control circuits (SLOA120TR, SLOP120TR, SLOA230TR, SLOP230TR) are to be installed with the same method as for the AC input relays, in addition to what is described above. This is done to achieve optimal heat dissipation. Also note the reduction diagram below. 24 V DC applications with high inductive loads If the load is strongly inductive, we recommend the use of transient protection along with SLO24CR. If transient protection cannot be fitted, we recommend SLO24CRA/SLO24CRA4, which have an operating voltage of up to 300 V DC. The relay has higher immunity to high-energy load transients. For inductive DC loads, the maximum nominal current is reduced. For more information about maximum current for inductive DC loads, contact OEM Automatic’s Panel Components business area or go to Delcon’s website: www.delcon.fi Colour coding Input l Input relays for AC voltage ❍ Input relays for DC voltage l Input relays for AC voltage, 2-wire sensors (leakage currents) Output l Output relays for AC voltage l Output relays for DC voltage Marking of Delcon interface modules There are two types of relay markings. Alt. 1. The marking holder is mounted on the relay’s clip bracket. Up to four marking digits can be applied to the holder. Alt. 2. Label for mounting on the marking holder or directly on the relay’s clip bracket. TheAlt. label 1 can be printed or marked with, for example, DYMO embossing tape. Approval CE, cULus listed (file no.: E162 828) Application tips NPN/PNP All input relays can be connected both for NPN and PNP logic. Input relays connected with long unscreened signal cables When power cables are installed beside signal cables for long distances, the CR type must be used. Connection of 2-wire sensors with leakage current If 2-wire sensors or other equipment that generates leakage current is to be connected to the interface relays, we recommend use of the following relays: Alt. 2 Input relay SLI120CRP or SLI230CRP. Output relay SLOP120TR or SLOP230TR. Forward/reverse operation with motors Delcon’s standard relays (e.g., SLO24TR) should not be used for forward/reverse operation of single-phase or three-phase motors. Doing so entails risk for the returned voltage damaging the relays. For forward/reverse or static control of AC motors, SLO24TRA is to be used. This relay is especially designed for controlling motor operation and has a higher maximum voltage compared to the standard relays. For forward/reverse control of DC motors, we recommend LPS24. www.weidmuller.com Weidmuller, USA | 800.849.9343 | [email protected] Weidmuller, Canada | 800.268.4080 | [email protected] Weidmuller, Mexico | 01.222.2686267 | [email protected] Interface Relays www.weidmuller.com Weidmuller, USA | 800.849.9343 | [email protected] Weidmuller, Canada | 800.268.4080 | [email protected] Weidmuller, Mexico | 01.222.2686267 | [email protected]