Major tech MT560 Manuale di istruzioni - Pagina 10

Sfoglia online o scarica il pdf Manuale di istruzioni per Apparecchiature di prova Major tech MT560. Major tech MT560 12. Digital insulation tester

connected to the housing would be connected to some metal part lf the

tool (e.g. chuck, blade).

Note: The switch of the device must be in the "ON" position and the

main power should be disconnected.

MOTORS

AC-Disconnect the motor from the line by disconnecting the wires at the

motor terminals or by opening the main switch. If the main switch is used

and the motor also has a starter then the starter must be held, by some

means, in the "ON" position. In the latter case, the measured resistance

will include the resistance of the motor, wire and all other components

between the motor and the main switch. If a problem is indicated, the

motor and other components should be checked individually. If the motor

is disconnected at the motor terminals, connect one megohmmeter lead

to the grounded motor housing and the other lead to one of the motor

leads. DC-Disconnect the motor from the line. To test the brush rigging,

field coils and armature connect one megohmmeter lead to the grounded

motor housing and the other lead to the brush on the commutator. If the

resistance measurement indicates a problem, raise the brushes off the

commutator and separately test the armature, field coils and brush

rigging by connecting one megohmmeter lead to each of them

individually, leaving the other connected to the grounded motor housing.

The above also applies to DC Generators.

10 10