Sedgwick TA315 - Page 32

TA Operation/Maintenance Instructions Page 32 of 36
Voltage between line and neutral at starter and motor.
Motor runs but trips.
Overload setting in starter.
Current drawn without load applied.
Current drawn under load.
Supply voltage without load and on moment of switch on.
Allowed variation plus/minus 6%.
Supply voltage under load.
Supply voltage with motor off.
(Check at isolator, starter and at motor).
Motor attempts to start then
trips.
For a single-phase permanent capacitor motor to reach its
required starting torque a healthy line voltage is essential.
Ensure that the correct cable size has been used to install
the machine (long runs of cable can cause voltage drop).
The machine is not jammed, and the spindle is free to
rotate.
Audible operation of centrifugal switch.
Integrity of capacitors.
Winding resistances of start and run windings.
Insulation resistance between motor windings and earth.
If at any time it becomes necessary to fit a new motor to your machine the procedure for
doing so is as follows:
1. Isolate machine and remove side cover.
2. Drop the blade to its lowest position and tilt it over to 45
0
.
3. Scribe or draw a line on the motor mounting plate round the motor footprint (this will
ensure that the new motor can be seated in the same position).
4. Remove the terminal box lid on the motor and make a sketch of the mains supply
connections and earth connection.
5. Unwire the motor and remove the conduit entry gland.
6. Tilt the blade back to its 90
0
position and slacken the two 19mm hex heads fastening
the motor mounting casting to the cradle plate.
7. Remove the drive belts.
8. Unfasten the motor from its mounting plate (4 x 13mm hex heads) and draw the motor
out through the access panel.
9. Measure the position of the motor pulley along the motor shaft and remove using a
4mm Allen Key. Fit the pulley to the new motor shaft in the same position.
10. Fasten the new motor to the mounting plate, aligning it with the scribed marks.
11. The motor is now fastened back onto its mounting plate, the pulleys checked for
alignment, and the vee ropes re-fit and correctly tensioned.
12. Tilt the blade over to 45
0
to re-wire the motor.
13. Ensure that all fastenings are secure before replacing the back cover and testing.