Lenze 13.7xx Motors-Geared motors - Manual (Page 39)

Maintenance/repair
Inspection intervals
Inspection intervals of the AC motors
7
l
39 BA 13.0009 − EN 2.1
7 Maintenance/repair
{
Danger!
ƒ Ensure that the drive system is deenergised before working on it!
ƒ High temperatures of the motor surfaces. Observe cooling times!
ƒ Remove the load from the motors or secure loads acting upon the drive!
ƒ When carrying out repairs, ensure that no contaminants enter inside the
motor!
7.1 Inspection intervals
7.1.1 Inspection intervals of the AC motors
The asynchronous motors generally are considered as maintenance−free.
)
Note!
To avoid overheating, simply remove the deposits on the drives regularly.
Apart from ball bearings, the motors do not feature any wearing parts. If the maximum
permissible radial and axial forces are observed (Tab. 1), the bearing is designed for a
service life of 10,000 h.
Defective ball bearings (running noises, possibly increased current consumption) can be
replaced together with possibly available gaskets by the operator himself. For this purpose,
remove A− and B−sided bearing shields and disassemble the motor. Always replace both
ball bearings in pairs using appropriate means. Please be absolutely sure to avoid blows to
shafts and exceeding the permissible radial and axial forces! Afterwards assemble the
motor again.
During each disassembly of a motor, replace shaft sealing rings that are possibly available.
In order to avoid damage to the sealing lips, basically mount shaft sealing rings with
mounting sleeves. The deep−groove ball bearings to be used are listed in Tab. 5 for the
individual motor types. The shaft sealing rings vary according to the application case and
have to be requested from the manufacturer or be identified on the motor at hand.
Motor type Frame size DIN625 deep−groove ball bearing
A − side B − side
13.71 L 35 608−2Z / 608−2RS 608−2Z
47 608−2Z / 608−2RS / 6000−2Z / 6000−2RS
55 6000−2Z / 6000−2RS 6000−2Z
13.75 L 45 608−2Z / 608−2RS 608−2RS
55 6201−2Z / 6201−2RS 6201−2RS
65 6202−2Z / 6202−2RS 6202−2RS
Tab. 5 Ball bearings of motor types 13.7 LL