SEW-Eurodrive DR63 Series - Extended Storage of Motors

Operating Instructions – Explosion-Proof AC Motors DR63/eDR63, DVE250/280
17
4
Extended storage of motors
Mechanical Installation
4.2 Extended storage of motors
• Note that the service life of the lubricant in the ball bearings is reduced by 10% per
year after the first year of storage.
• Before startup, you should re-lubricate the lubrication devices on motors that have
been in storage for longer than 5 years. Observe the information on the motor lubri-
cant plate.
• Check whether the motor has absorbed moisture as a result of being stored for a long
time. Measure the insulation resistance for this purpose (measuring voltage 500 V).
The insulation resistance (see following figure) varies greatly depending on the
temperature. The motor must be dried if the insulation resistance is not adequate.
4.2.1 Drying the motor
Heat the motor
• with warm air, or
• using an isolation transformer
– Connect the windings in series (see following figures)
– Auxiliary AC voltage supply max. 10% of the rated voltage with max. 20% of the
rated current
Connection with wiring diagram R13:
173323019
100
10
1
0,1
0
20
40
60
80
[˚C]
[M ]
2336250251
[1] Transformer
[1]