8.11.4 Circuit diagram P = Motor overload cut-out R = Rotor S = Stator T = Tachymetric generator 8.11.5 Checking for efficiency 1. Check the connector blocks (wiring) and check for any bent or detached terminals. 2. Check for traces / residue / deposits of water or detergent and identify their source. 3. Check for any windings / components connected to mass or inadequately earthed using a tester with a minimum scale of 40mW across each terminal and the casing (correct reading is ). 4. Check the individual windings against the values shown in the table below: ( ④ ) excluding the resistance of the brushes Notes :
- When checking the rotor winding, measurement should be effected around the entire surface, turning the spindle very slowly and checking for any short-circuits between visible plates. Also check the carbon brushes for wear. - If noise is generated (bearings-magnet-belt), detach the drive belt from the pulleys and locate the source. SOI/DT 2002-05 eb 81 599 35 23-17 Terminals on motor connector block Components to be checked SOLE motor [ Ω] F.H.P. motor [ Ω] CE.SE.T.
motor [ Ω] 3 - 4 Tachymetric generator winding 171 ÷ 196 126 ÷ 147 64 ÷ 73 469 ÷ 540 5 - 10 Stator winding (full range) 1.0 ÷ 2.2 1.0 ÷ 3.0 1.0 ÷ 2.0 6 - 7 Overload cut-out 0 0 0 8 - 9 Rotor winding (④) 1.5 ÷ 3.0 1.5 ÷ 3.0 1.5 ÷ 3.0 1 - 10 Stator winding (half range if terminal 1 is present) 0.5 ÷ 1.0 0.5 ÷ 1.5 0.5 ÷ 1.0