Spencer Power Mizer Multistage Centrifugal Cast Blowers - Manual (Page 14)

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Indication: motor malfunction
• Abnormal hum or whine.
• Low voltage, motor not up to speed.
• High voltage (causes noise and burn-
out).
• Bearing noise (see previous
instructions for blower bearings).
• Loose part in motor.
• Low frequency.
Check motor manufacturer’s instructions; check voltage
supply and connections.
Correct improper voltage.
Correct improper voltage.
Tighten, repair or replace (check with motor manufacturer).
Correct improper frequency.
MOTOR HOT (Check with surface thermometer; consult Spencer Service Department for assistance)
• Ambient temperature too high for insu-
lation class.
• Incorrect voltage.
• Incorrect cycle.
• Electrical short-circuit insulation
failure.
• Motor overloaded, too much air
passing through blower.
Cool motor or replace with motor having proper insulation.
Change to correct voltage.
Change to correct cycle.
Repair or replace motor.
Check for system leaks, throttle back butterfly valve, install
larger motor.
MACHInE
nOISY Indication: machine malfunction – bearing whining or growling
• Bearing hot.
• Bearing failure.
• Bearing retainers worn.
• Bearing turning on shaft, retaining nut
loose.
• Bearing turning in housing, housing worn.
• Bearing replaced incorrectly (e.g.,
angled, cramped or reversed).
Check lubricant, add or drain as necessary. Be sure oiler is
functioning properly and screw cap is tightened properly.
Replace bearing(s).
Replace bearing(s).
Tighten nut, check for damage.
Replace housing and bearing.
Follow installation directions carefully, check bearing, shaft
and housing dimensions.
Indication: machine malfunction – internal noise
• Impellers worn due to age or abrasion
from dirty air or gas.
• Machine in surge (see page 8).
• Machine running rough, out of balance.
• Coupling misaligned and/or out of
grease.
• Foreign matter in machine.
• Impellers or shaft sleeve hitting.
Correct abrasive conditions if present; consult Spencer
Service Department regarding impeller replacement.
Increase airflow.
Consult Spencer Service Department.
Check alignment, realign if necessary; check coupling for
wear, replace if worn; relubricate as instructed.
Consult Spencer Service Department regarding machine
cleaning; install inlet filter to prevent clogging.
Consult Spencer Service Department.
IX. Troubleshooting Guide
(cont.)
PROBLEM Possible Cause Corrective Action