Contactor And Motor Starters

Question 1

What would be the next step if 240v is measured at L1&L2 of the contractor, but 0volts is measured at the T1&T2 terminal?

Answer 1

Measure for voltage at the contractor coil

Question 2

What is the maximum allowable voltage drop across the contacts of a contractor,before it needs to be replaced or repaired?

Answer 2

3%

Question 3

Discolored contacts(burnt) on a contractor indicates the contacts are faulty

Answer 3

False, test across contacts for voltage drop.

Question 4

Chattering contacts in a contractor can be caused by which of the following?

Answer 4

Faulty contacts, low coil voltage, loose electrical connection (All of the above)

Question 5

Infinite resistance (OL) measured across the coil connections on the contractor indicates

Answer 5

The coil is open and the contractor or coil needs to be repaired