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Operating Instructions – Explosion-Proof AC Motors – DRS/DRE/DRP 315
7
Inspection and maintenance work on the motor DR315
Inspection/Maintenance
7.4.2
Inspection steps DR.315
1. With gearmotors: Remove the motor from the gear unit.
2. Remove fan guard [35] and fan [36].
3. Unfasten machine screws [25] [19] and remove B-side endshield [42].
4. Unfasten machine screws [15] from the flange [7] and remove the complete rotor [1]
together with the flange. With gearmotors, pull off the oil flinger [107].
5. Loosen screws [609] and separate the rotor from the flange [7]. Before disassembly,
protect the oil seal seat from damage using adhesive tape or a protective sleeve.
6. Visual inspection: Is there any moisture or gear unit oil inside the stator?
– If not, proceed to step 8
– If there is condensation, proceed to step 7
– If there is gear oil, have the motor repaired by a specialist workshop
7. If there is condensation inside the stator:
Clean the winding, dry it and check it electrically (see section "Preliminary work"
(see page 14).
8. Replace the roller bearings [11] [44] with permitted roller bearing types.
See section "Permitted anti-friction bearing types" (see page 34).
Fill the bearing with grease until it is two-thirds full.
See section "Bearing lubrication DR.315" (see page 29).
Caution: place the oil seal flange, [608] and [21], onto the rotor shaft before installing
the bearings.
9. Starting on the A-side, mount the motor vertically.
10.Place the cup springs [105] and lubrication ring [604] into the bearing bore of the
flange [7].
Hang the rotor onto the B-side thread, and guide into the flange [7].
Fasten the oil seal flange [608] to the flange [7] using the hex head bolts [609].
HAZARD!
Risk of crushing if the drive starts up unintentionally.
Severe or fatal injuries.
• Disconnect the motor from the power supply before starting work and safeguard
against accidental startup.
• Carefully observe the following operation steps.
