TEST A MULTIPLE CONTACT RELAY 5-60KW TQG GENERATOR SETS

MULTIPLE 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 E = Energized D = De-energized DE 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) 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 CONTACTS PINS 7,8,9 A moveable contact is connected to the armature in such a way that the contact is held in its normal position. When the electromagnet is energized, it exerts a magnetic force that overcomes the pull of the tension spring and moves the contacts to either ENERGIZE or DE-ENERGIZE a circuit with the stationary contacts.

STATIONARY CONTACTS It will make (energize) or brake It will make (energize) or brake (de-energize) a circuit with the moving contacts. Pins 4,5,6 and 1,2,3 are stationary contacts Pins 4,5,6 and 1,2,3 are stationary contacts

INSPECTION Refer to applicable TM Remove applicable relay Remove applicable relay Inspect relays for cracks, loose mounting, and other damage Inspect relays for cracks, loose mounting, and other damage

TESTING Using a multimeter, check between terminals A and B, and check for ohms, serviceable relays should render a reading between and ohms. Using a multimeter, check between terminals A and B, and check for ohms, serviceable relays should render a reading between and ohms. Using a multimeter, check for CLOSED circuits between terminals 7 and 1, 8 and 2, Using a multimeter, check for CLOSED circuits between terminals 7 and 1, 8 and 2, and 9 and 3. (DE-energized – NC-Continuity) Also check for OPEN circuits between 7 and 4, Also check for OPEN circuits between 7 and 4, 8 and 5, and 9 and 6. (Energize to use – NO – OL)

A B E = Energized D = De-energized DE 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 ohms

Connect relay to a 24 VDC power source. Connect relay to a 24 VDC power source. Listen for an audible click while watching to make sure the contacts reverse direction. Listen for an audible click while watching to make sure the contacts reverse direction. Using a multimeter, check for open (de-energized) circuits between 7 and 1, 8 and 2, and 9 and 3. Using a multimeter, check for open (de-energized) circuits between 7 and 1, 8 and 2, and 9 and 3. Check for closed (energized) circuits between 7 and 4, Check for closed (energized) circuits between 7 and 4, 8 and 5, and 9 and 6. TESTING