Lenze MDxMA-MHxMA-MFxMA-MDERA-MHERA Three-phase AC motors - Manual (Page 46)

Maintenance/repair
Maintenance operations
Motor
8
l
46 BA 33.0005−EN 2.0
8.3 Maintenance operations
8.3.1 Motor
(
Stop!
ƒ Make sure that no foreign bodies can enter the inside of the motor!
ƒ Only work on the drive system when it is in a deenergised state!
ƒ Do not remove plugs when voltage is being applied!
ƒ Hot motor surfaces up to 140 °C. Observe cooling times!
ƒ Remove loads acting on motors or secure loads acting on the drive!
8.3.2 Spring−operated brakes
The brake is mounted to the N−end shield of the motor. Remove the fan cover or blower
unit to check, maintain, or set the brake.
)
Note!
Brakes with defective armature plates, cheese head screws, springs or counter
friction faces must always be replaced completely.
Generally observe the following for inspections and maintenance works:
ƒ Remove oil and grease linked impurities using brake cleaning agents, if
necessary, replace brake after identifying the cause of the contamination.
Dirt deposits in the air gap between stator and armature plate impair the
function of the brake and must be removed.
ƒ After replacing the rotor, the original braking torque will not be reached
until the run−in operation of the friction surfaces has been completed. After
replacing the rotor, run−in armature plates and counter friction faces have
an increased initial rate of wear.