Industrial Relays, General Information

Transcription

1 products Panel Relays General information Industrial Relays, General Information General Information Application Guide Breaking Capacity Approvals General Information Contacts Contact material There are different types of contacts. The biggest difference is noticed between single contacts and twin contacts. While single contacts are best for higher loads, twin contacts are significantly more reliable for small loads, such as <24 V, <100 ma. Minimum loads The minimum load value is a recommended value under normal conditions, such as regular activation and drop out, no unusual environmental conditions, etc. Under these conditions, reliable relay function can be anticipated. No contact is right for all situations. AgNi is used as standard material for most applications. AgNi contacts with a hard gold-plating (up to 10 µm) are available for applications in aggressive environments. Relays with gold-plated contacts are approved for relatively high currents (e.g., 6 A, 250 V), but in practice, loads above 200 ma, 30 V should not be switched with intact gold-plated contacts. Relays with tungsten contacts can be used with high inrush currents (up to 500 A for 2.5 ms). There are also AgNi contacts with small amounts of gold (0.2 µm). This is only used as protection against corrosion during storage. Contact resistance Contact gap In practice, contact resistance can vary depending on the load and other conditions. For higher currents, contact resistance is about 10 mω. For very low loads, the resistance can be over 1 Ω. Coils Powering of a relay is dependent on the coil and connections. The coil has a special character depending on the operating voltage and the type of current. All contacts normally have an air gap of between 0.5 and 1.5 mm when they are open. This type of contact is called a µ contact. According to the low-voltage directive and the associated standards, contacts of this type are not suitable as safety switches. When DC loads are connected and disconnected, a large contact gap is advantageous in extinguishing the arc that occurs with this type of load. Series connection of relays can be utilised for this purpose.

2 Breaking capacity Coil resistance Contacts' breaking capacity is the sum of the breaking voltage and current. For AC, the permitted breaking capacity is generally sufficiently high to withstand the maximum constant AC1 load throughout the voltage range. For DC, the current limit's curve may never be exceeded. This can lead to a residual arc that causes immediate failure of the relay. The breaking capacity level for DC is about 100 W (DC1). Each coil has a coil resistance that can be measured with an ohmmeter. The specified coil resistance is measured at 20 C. The tolerance is ±10 %. For AC operation, the coil current will not match the resistance value due to self-inductance having a dominant effect. At 230 V AC, this can be more than 90 H. When a relay breaks current, the self-inductance results in an internal voltage that can affect the breaking position, destroy transistors or create EMC problems. Coil construction Holding and drop-out voltage The coil consists of a plastic housing, heat resistance up to 130 C and dual-isolated, pure copper wire, temperature class F. The winding must withstand an isolation voltage per EN of over 2000 V. This is assured with a forced separation at the beginning and end of the winding. Operating voltage The holding voltage is the voltage at which the relay is guaranteed to remain in the activated position. The limit at which the relay becomes unstable for DC is about 25 % of Unom, and for AC about 60 %. The drop-out voltage for DC is 65 % and AC 75 %. For DC, these voltages are very temperature dependent, according to the temperature coefficient Cu. This is not the case with AC, where the inductive resistance is the controlling factor. This is largely constant over a wide temperature range. There is a difference between the voltage that is standardised per ENFor AC, and within a certain range of under-voltages, humming can and what is guaranteed for the relay, and the typical values be emitted from the relay or vibrations can occur in the relay housing. that can most likely be expected during operation. This voltage range should be avoided. Operating voltage range The operating voltage is the range in which the relay functions satisfactorily. If not otherwise indicated, the relay's normal operating voltage is between +10 % and -20 % of Unom. This range is very temperature sensitive and narrows when the ambient temperature and relay temperature increase. The upper operating voltage limit has a steeper curve than the lower limit. At about 70 C, the operating voltage tolerance is equal to zero.

3 Application Guide Standard - used in the most general applications, such as automation, pneumatics, heat regulation, signalling and input/output relays. Min.breaking AC1 AC15 DC1 DC13 capacity C2-A20 Industrial relay, 8-pin 2 change-over 10 A/250 V 6 A/250 V 0.5 A/110 V 2 A/24 V 10 ma C3-A30 Industrial relay, 11-pin 3 change-over 10 A/250 V 6 A/250 V 0.5 A/110 V 2 A/24 V 10 ma C4-A40 Industrial relay, 14-pin 4 change-over 10 A/250 V 6 A/250 V 0.5 A/110 V 2 A/24 V 20 ma (2.8 mm) C5-A30 Industrial relay, 11-pin 3 change-over 16 A/500 V 8 A/500 V 0.5 A/110 V 10 A/24 V 20 ma C7-A10 Miniature relay, 8-pin 1 change-over 16 A/250 V 8 A/250 V 0.5 A/110 V 5 A/24 V 10 ma C7-A20 Miniature relay, 8-pin 2 change-over 10 A/250 V 6 A/250 V 0.5 A/110 V 2 A/24 V 10 ma C9-A41 Miniature relay, 14-pin (2.6 mm) 4 change-over 5 A/250 V 1 A/250 V 0.2 A/110 V - 10 ma C10-A10 Interface relay, 5-pin 1 change-over 10 A/400 V 6 A/400 V 0.5 A/110 V 3 A/24 V 10 ma C12-A21... Interface relay, 8-pin (2.6 mm) 2 change-over 5 A/250 V A/110 V - 10 ma Twin Contact - used for low currents, such as PLC. The relay has twin contacts and is highly reliable. Withstands a min. current of 1 ma/5 V. The contacts have a 0.2 µ gold plating as standard. (1-pole: 3 µ gold). Min. breaking AC1 AC15 DC1 DC13 capacity C2-T21 Relay, 8-pin 2 change-over 6 A/250 V - 6 A/30 V - 5 ma C3-T31 Relay, 11-pin 3 change-over 6 A/250 V - 6 A/30 V - 5 ma C7-T21 Miniature relay, 8-2 change-over 6 A/250 V - 6 A/30 V - 5 ma pin C10-T13 Interface relay, 5-1 change-over 6 A/400 V - 6 A/30 V - 5 ma pin Gold Contact - normally used in conjunction with low currents. However, testing alone confirms a minimum current of 10 ma. We know from experience that currents lower than 10 ma also work fine. C2-A28 Relay, 8-pin 2 change-over C3-A38 Relay, 11-pin 3 change-over C4-A48 Relay, 14-pin (2.8 mm) 4 change-over C5-A38 Relay, 11-pin 3 change-over C7-A28 Miniature relay, 8-pin 2 change-over C9-A42 Miniature relay, 14-pin (2.6 mm) 4 change-over C10-A18... Interface relay, 5-pin 1 change-over Contact OEM Automatic's Panel Components product area for advice.

4 Open Contact - designed for DC loads. An open contact has a 1.5 mm gap, which provides improved breaking capacity. The relay has no mechanical indication but is available with an LED quenching diode or polarity protection as options. AC1 DC1 DC1 DC13 C2-G20 Relay, 8-pin 2 closing 10 A/250 V 1.2 A/110 V 0.4 A/220 V 0.3 A/110 V C3-G30 Relay, 11-pin 3 closing 10 A/250 V 1.2 A/110 V 0.4 A/220 V 0.3 A/110 V C5-G30 Relay, 11-pin (4.8 mm) 3 closing 16 A/500 V 1.2 A/110 V 0.4 A/220 V 0.3 A/110 V C7-G20 Miniature relay, 8-pin 2 closing 10 A/250 V 0.8 A/110 V 0.4 A/220 V 0.3 A/110 V Relay with double make has two contacts and is mass-produced for breaking high DC loads. The contact gap is 3 mm ( ), which provides increased breaking capacity. It is suitable for applications in power stations. The relay has no mechanical indication but is available with an LED, quenching diode and polarity protection as options. Double Make AC1 DC1 DC1 DC13 C3-X10. Relay, 11-pin 1 closing (double make) 10 A/250 V 7 A/110 V 1.2 A/220 V 0.3 A/220 V C4-X20. Relay, 14-pin (2.8 mm) 2 closing (2 double make) 10 A/250 V 7 A/110 V 1.2 A/220 V 0.3 A/220 V C5-X10. Relay, 11-pin 1 closing (double make) 16 A/500 V 7 A/110 V 1.2 A/220 V 0.3 A/220 V C7-X10. Miniature relay, 8-pin 1 closing (double make) 10 A/250 V 6 A/110 V 1 A/220 V 0.3 A/220 V The relay, featuring double make with a blow-out magnet, is especially manufactured for very high DC loads. The relay has two contacts in series with a gap of 3 mm ( ). Between the contacts there is a magnet that directly blows out any arcing during the opening stage, which a entails long lifetime expectancy. It is suitable for applications in power stations. The relay has no mechanical indication but is available with an LED, quenching diode or polarity protection as options. Double Make w/ Blow-Out Magnet AC1 DC1 DC13 DC13 C3-M10 Relay, 11-pin 1 closing (double make) 10 A/250 V 10 A/220 V 3.6 A/110 V 2 A/220 V C5-M10 Relay, 11-pin 1 closing (double make) 16 A/500 V 10 A/220 V 3.6 A/110 V 2 A/220 V

5 In practice, a remanence relay works like an impulse relay. The difference is that a remanence relay has two inputs, one for connection and one for disconnection (on/off). Minimum pulse length for on/off control is 50 ms. Description Remanence Relay On/Off Input Max. breaking capacity AC1 AC15 DC1 DC1 C3-R20 Relay, 11-pin 2 change-over 10 A/250 V 6 A/250 V 10 A/30 V 0.5 A/110 V C4-R30 Relay, 14-pin (2.8 mm) 3 change-over 10 A/250 V 6 A/250 V 10 A/30 V 0.5 A/110 V C5-R20 Relay, 11-pin 2 change-over 10 A/500 V 6 A/500 V 10 A/30 V 0.5 A/110 V C9-R21 Miniature relay, 14-pin (2.6 2 change-over 5 A/250 V 1 A/250 V 5 A/30 V 0.2 A/110 V mm) Fluorescent Lamp Relay - designed for handling high inrush currents (500 A for 2.5 ms). The relay has two parallel contacts of which one is in wolfram (tungsten) and the other in nickel-silver. Fluorescent lamp loads are suitable applications. AC15 ACa/b C7-W10 Miniature relay, 8-pin 1 closing 10 A/250 V 6 A/250 V Low power relays are adapted for applications that require either low power consumption or wide voltage ranges for the coil voltage. (For example, of the coil voltage.) The contacts feature 0.2 µ gold as standard but are also available with 10 µ gold upon request. Low power Relay (high resistance with little power consumption) AC1 DC1 C3-S14 Relay, 11-pin 1 change-over 6 A/250 V 6 A/30 V C3-E24 Relay, 11-pin 2 change-over 6 A/250 V 6 A/30 V C3-N34 Relay, 11-pin 3 change-over 6 A/250 V 6 A/30 V C9-E21 Miniature relay, 14-pin (2.6 mm) 2 change-over 5 A/250 V 5 A/30 V

6 Load/Signal Relay - designed with a load contact and a signal contact. The load contact is a standard contact (AgNi) for maximum current of 10 A (resistive) and the signal contact is a twin contact (AgNi & 3 µ Au) for a minimum current of 1 ma and maximum of 6 A. The relay is perfect for use with, for example, applications with PLCs (see the example below). Article Execution C7-H23. Miniature relay, 8-pin Description of different load categories AC-1 Resistive load, AC load AC-15 Inductive AC load AC-5a/b Fluorescent lamp load DC-1 Resistive DC load DC-13 Inductive DC load Breaking Capacity

7 Diagram 1. C2A, C3 -(A,R), C4-(A,R), C5R, C7A Diagram 2. C5-A, A5-A Diagram 3. C9-A, C9-E, C9-R Diagram 4. C10-A Diagram 5. C3-X, C4-X Diagram 8. C2-G, C3-G Diagram 7. C12-A

8 Contact protection information Contact protection For the relay to comply with the lifetime as specified by the manufacturer, the stipulated data for voltage, current and VA may not be exceeded. Contact data is normally specified only for resistive loads. The load that a relay can withstand with inductive loads is significantly lower and is normally specified on special data sheets, prepared by the manufacturer. Inductive loads For drop out of an inductive load, such as a solenoid valve or a motor, a drop-out transient occurs that can exceed the supply voltage by several hundred volts. To prevent the occurrence of this transient, various types of protection can be used. Examples are provided below. R/C protection across the contact R/C protection across the load AC/DC >48 V AC/DC <48 V Diode across the load DC Varistor across the load AC/DC Approvals

9 Relay type C2-A2, C3-A3 X X X X X X X IEC 61810; EN C2-T2, C2-G2 X X X X IEC 61810; EN C3-T3, C3-G3, C3-X1 X X X X IEC 61810; EN C3-M1 X X IEC 61810; EN C3-R2, C3-E2, C3-N3 X X X X X IEC 61810; EN R3-N3 X X IEC60077/EN /99; EN61373/99 C4-A4 X X X X X IEC 61810; EN C4-X2, C4-R3 X X X X IEC 61810; EN C5-A2, C5-A3 X X X X X X IEC 61810; EN C5-G3, C5-M2, C5-R2 X X X X IEC 61810; EN C5-X1, C5-M1 X X X X X IEC 61810; EN C7-A10, C7-T2 X X X X IEC 61810; EN C7-A20 X X X X X X X IEC 61810; EN C7-G2, C7-X1, C7-W1 X X X X X IEC 61810; EN C7-H2 X X X IEC 61810; EN R7-A2, R7-T2 X X IEC60077/EN ; EN61373/99 C9-A4, C9-E2, C9-R2 X X X X X X X IEC 61810; EN C10-A1, C10-T1 X X X X X X IEC 61810; EN C10-GT1 X X X X X IEC 61810; EN C12-A2, C12-G2 X X X X X IEC 61810; EN CSSAC, CSSDC X X X X CT2, CT3 X X X S2B, S3B X X X X X X EN , EN S2S, S3S, S3MP X X X X X EN , EN S3MS X X X S2L, S2P, S2PO, S3L, X X X S3P, S3PO S4B, S4L, S4P, S4PO X X X X S5S X X X X X EN , EN S5L, S5P, S5PO X X X S7M, S7IO, S9M X X X X X X EN , EN S7L, S7P, S7PO, S9L, X X X X EN , EN S9P, S9PO S-10 X X X X X EN , EN S-10K X X X X EN , EN S-10M X X X IEC 61810; EN S10P, S12P X X X X IEC 61810; EN S-12 X X X X IEC 61810; EN 60947