TEST ATEST A MULTIPLE MULTIPLE

CONTACT RELAY CONTACT RELAY 5-60KW TQG 5-60KW TQG

GENERATOR SETSGENERATOR SETS

MULTIPLE CONTACT RELAYMULTIPLE CONTACT RELAY

Is operated by the flow of electricity (24V DC) in one circuit, and controlling the flow of electricity in another circuit. A multiple contact relay consists of an electromagnet with both moving and stationary contacts. When the electromagnet is de-energized, the contacts return to its original position.

A

B

7

9

8

6

5

4 1

2

3

E = EnergizedD = De-energizedDE

There are six different sets of contacts.ALWAYS use 7,8,9.When energized 4,5,6 are used.When De-energized 1,2,3 are used.

MULTIPLE CONTACT RELAY

COIL CONTACTS

ELECTROMAGNET (COIL)ELECTROMAGNET (COIL)

When the electromagnet (coil) is energized by applying 24V DC to pin, (B) = (-) and pin (A) = (+), to energized, it exerts a force that overcomes the pull of the tension spring. This moves the contacts to either complete or break a circuit.

MOVING CONTACTSMOVING CONTACTS

PINS 7,8,9PINS 7,8,9

A moveable contact is connected to the A moveable contact is connected to the armature in such a way that the contact is held armature in such a way that the contact is held in its normal position. When the electromagnet in its normal position. When the electromagnet is energized, it exerts a magnetic force that is energized, it exerts a magnetic force that overcomes the pull of the tension spring and overcomes the pull of the tension spring and moves the contacts to either moves the contacts to either ENERGIZEENERGIZE or or DE-DE-ENERGIZEENERGIZE a circuit with the stationary a circuit with the stationary contacts.contacts.

STATIONARY CONTACTSSTATIONARY CONTACTS

• It will make It will make (energize)(energize) or brake or brake (de-energize)(de-energize) a circuit with the moving contacts. a circuit with the moving contacts.

• Pins 4,5,6 and 1,2,3 are stationary contactsPins 4,5,6 and 1,2,3 are stationary contacts

INSPECTIONINSPECTIONRefer to applicable TMRefer to applicable TM

• Remove applicable relayRemove applicable relay

• Inspect relays for cracks, loose Inspect relays for cracks, loose mounting, and other damagemounting, and other damage

TESTINGTESTING• Using a multimeter, check between terminals A and Using a multimeter, check between terminals A and

B, and check for ohms, serviceable relays should B, and check for ohms, serviceable relays should render a reading between 427.5 and 522.5 ohms.render a reading between 427.5 and 522.5 ohms.

• Using a multimeter, check for Using a multimeter, check for CLOSEDCLOSED circuits circuits

between terminals 7 and 1, 8 and 2, between terminals 7 and 1, 8 and 2, and 9 and 3.and 9 and 3.

((DE-energizedDE-energized – NC- – NC-ContinuityContinuity))

• Also check for Also check for OPENOPEN circuits between 7 and 4, circuits between 7 and 4, 8 and 5, and 9 and 6. 8 and 5, and 9 and 6.

((EnergizeEnergize to use – NO – to use – NO – OL)OL)

A

B

7

9

8

6

5

4 1

2

3

E = EnergizedD = De-energizedDE

There are six different sets of contacts.ALWAYS use 7,8,9.When energized 4,5,6 are used.When De-energized 1,2,3 are used.

MULTIPLE CONTACT RELAY

COIL CONTACTS

427.5 - 522.5 ohms427.5 - 522.5 ohms

• Connect relay to a 24 VDC power source.Connect relay to a 24 VDC power source.

• Listen for an audible Listen for an audible clickclick while watching to make sure while watching to make sure the contacts reverse direction.the contacts reverse direction.

• Using a multimeter, check for open Using a multimeter, check for open (de-energized)(de-energized) circuits between 7 and 1, 8 and 2, and 9 and 3. circuits between 7 and 1, 8 and 2, and 9 and 3.

• Check for closed Check for closed (energized)(energized) circuits between 7 and 4, circuits between 7 and 4, 8 and 5, and 9 and 6.8 and 5, and 9 and 6.

TESTINGTESTING