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Dalroad Norslo - Industrial Equipment - Relay training level 1 -  Tyco Electronics
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Dalroad Norslo - Industrial Equipment - Relay training level 1 - Tyco Electronics

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Dalroad Norslo is an offical distributor for Tyco Electronics products.

Dalroad Norslo is an offical distributor for Tyco Electronics products.

Published in: Automotive, Business, Technology

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Transcript

  • 1. Relay Training Level The very Basics for Retards!
  • 2. What is a Relay?
    • A relay is an electrically operated switch. Relays use an electromagnet to operate a switching mechanism mechanically. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits, repeating the signal coming in from one circuit and re-transmitting it to another. Relays were used extensively in telephone exchanges and early computers to perform logical operations .
  • 3. How does it work?
    • A relay uses an electro magnet (coil) inside its casing to pull in a plunger that is attached to a switch contact or set of switch contacts.
  • 4. Electro Magnet
    • An electromagnet is a magnet made with electricity. Normal magnets are called permanent magnets. An electromagnet has the same properties as an ordinary magnet. It has a north and south pole and it attracts steel and iron. It is different from a permanent magnet because it can be turned on and off. When electricity flows in a circle of wire, it makes a magnet. One side of the wire is a north pole, the other side is a south pole. If there are many loops of wire, the magnet is stronger.
  • 5. Contacts
    • Within the relay there will be switch contacts, each separate switch is referred to as a “Pole”. The poles within the relay will have a “Current rating” which is shown in “Amps”. The higher the current rating the more current it is able to switch.
    • Each Pole could be made up of the following:
    • Change Over contact C/O = 3 relay pins
    • Normally Open Contact N/O = 2 relay pins
    • Normally Closed Contact N/C = 2 relay pins
  • 6. Contacts
    • Change Over contact (C/O) – Also described as Double throw. This has 3 contact points. The Common (C) contact is the point where the incoming voltage/current is connected.
    • The Normally Open contact (NO) makes circuit with the Common contact when the relay is operated.
    • The Normally Closed contact (NC) breaks circuit with the Common contact when the relay is operated.
  • 7. Relay Poles explained
    • Single Pole C/O = 5 Pins SPDT (Single Pole Double Pole)
    • Coil A1
    • Coil A2
    • Common
    • Normal Open
    • Normally Closed
    • Double Pole C/O = 8 Pins DPDT (Double Pole Double Throw)
    • Coil A1
    • Coil A2
    • Common 1
    • Normal Open 1
    • Normally Closed 1
    • Common 2
    • Normal Open 2
    • Normally Closed 2
  • 8. Continued
    • 3 Pole C/O = 11 Pins 3PDT (3 Pole Double Throw)
    • Coil A1
    • Coil A2
    • Common 1
    • Normal Open 1
    • Normally Closed 1
    • Common 2
    • Normal Open 2
    • Normally Closed 2
    • Common 3
    • Normal Open 3
    • Normally Closed 3
  • 9. Continued
    • 4 Pole C/O = 14 Pins 4PDT (4 Pole Double Throw)
    • Coil A1
    • Coil A2
    • Common 1
    • Normal Open 1
    • Normally Closed 1
    • Common 2
    • Normal Open 2
    • Normally Closed 2
    • Common 3
    • Normal Open 3
    • Normally Closed 3
    • Common 4
    • Normal Open 4
    • Normally Closed 4
  • 10. What Questions should I ask the customer when trying to specify a relay?
    • How many poles do you need (how many pins does it have)?
    • 5pin single pole, 8pin double pole, 11pin 3pole, 14pin 4 pole.
    • What is the coil voltage?
    • This is the voltage the customer is using to operate the coil (electro Magnet) this could be 12, 24, 48, 110, 230
    • Check if this is AC (Alternating current) or DC (Direct current)
    • What current are you switching across the contacts?
    • Depending on the application this could be any thing from milliamps to 30amps, this is very important so please ask the customer before giving any part numbers.
    • Do you need a base with this relay?
    • Most customers will require a base to mount the relay, always ask.
  • 11. PT Relay The PT Relay range is one of the most popular General purpose Relays sold, you will get more Enquiries for this than any other relay. This is available in 2, 3 and 4 pole versions.
  • 12. PT Relay Bases
  • 13. MT Relay The MT Relay is another widely used general purpose Relay, these are also know as octal relays as their pins are In a circular configuration. The MT is available in 2 and 3 pole types 10amps.
  • 14. MT Relay Bases
  • 15. Quiz!
    • How many pins does a 3 pole C/O relay have?
    • How many poles does a 14 pin relay have?
    • What does the term C/0 mean?
    • What does the term Octal relay mean?
    • What part number would I need if I needed a 14 pin relay with a 24vdc coil?
    • What is the part number for the base to go with the relay in question 5?
    • Name the points that make up a C/O contact?
    • What is the part number for a 3 pole octal relay with a 24vac coil?

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