Siemens 880 Installation Operation & Maintenance page 13

Operation
Trouble Shooting
TROUBLE
Motor overheating
(continued...)
Fine dust under coupling
having rubber buffers or
pins.
Bearing overheating.
Oil leakage or excessive
oil usage.
Excessive oil level
fluctuation.
POSSIBLE CAUSES
Open stator windings.
Air Recirculation.
Over voltage/under voltage.
Ground.
Improper electrical connections.
Heat exchanger tubes blocked.
Loose heat exchanger tubes.
Misalignment.
Oil level too high or low (sleeve bearing).
Misalignment.
Excessive tension in belt drive.
Excessive end thrust.
Too much grease (ball or roller bearing).
Sticking oil ring (sleeve bearing).
Parts not sealed properly.
Clogged oil return holes in oil seals.
High pressure or vacuum in bearing cavity.
Hazardous voltage.
Will cause death, serious injury,
electrocution or property damage.
Disconnect all power before working on
this equipment.
Disconnect motor from load. Check idle amps
for balance in all three phases. Check stator
resistance in all three phases for balance.
Check air intake and exhaust for obstructions.
Check air inlet temperature.
Check voltage and compare to rating plate.
Locate with test lamp or insulation tester and
repair.
Recheck electrical connections.
Clean tubes, if so equipped.
If so equipped, Roll tubes to expand tube
inside diameter using proper expansion tool.
Realign motor and driven equipment.
Inspect coupling.
Correct oil level. See Maintenance section of
this instruction book to determine proper oil
level.
Realign motor and driven equipment.
Reduce tension to point of adequacy.
Reduce thrust. Recheck mounting and
alignment.
Relieve supply to point set by manufacturer.
Clean, repair, or replace. Recheck mounting.
Seal pipe plugs and connections.
Seal bearing housing split line.
Seal oil seal joint.
Dismantle and clean oil seals.
Measure pressure or vacuum using
manometer (See "Cavity Pressures" under
Bearings).
Check atmospheric vents for obstructions.
Check oil seal gap for uniformity.
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DANGER
CORRECTION