Spencer Vacuum Cleaning Systems - Manual (Page 19)

19
Trouble Probable Cause Corrective Action
Motor malfunctions:
– Electric hum or whine – some usually normal. Check motor manufacturer’s instructions. Check voltage
supply and connections.
– Wrong voltage – low voltage motor not up to speed. High Check for proper voltage at motor and correct.
voltage will burn out motor and also cause noticeably
more noise.
– Bearing (see above)
– Motor rebuilt improperly – thrust taken on wrong end in
Rebuild motor properly and correct end play.
standard overhung machine.
– Loose part in motor. Tighten, repair or replace (check with motor
manufacturer).
– Low frequency. Separate power supply; correct frequency.
Machine vibrating Imbalance:
– Material build-up on Impeller(s). Clean Impeller(s); check separator filters.
– Shaft bent – possibly in shipment – (.001 maximum shaft Replace shaft.
run per 10" of length for standard and 4-bearing overhung
machines.
– Bearing(s) failure. Replace bearing(s).
– Faulty replacement motor installed and /or machine Disassemble machine, balance motor, reassemble
reassembled incorrectly. according to instruction in this book and assembly print.
– Impeller(s) failure. Replace Impeller(s).
Mechanical:
– Motor not aligned in casing (standard overhung & Align motor, realign shaft.
4-bearing overhung), Impeller rubbing.
– Coupling misaligned (4-bearing machines). Align coupling.
– Inlet and/or outlet piping connected to machine without Install flexible connection at inlet and outlet.
flexible connector causing torque or strain on casing.
– Machine bolted down causing change in alignment. Remove bolts; use dowel pins or set in guide channels.
– Bearing(s) cramped due to improper fit. Check bearings, shaft and housing, correct bearing fit.
– Tubing not properly supported. Properly anchor tubing beyond flexible connector.
– Improper voltage on motor causing assembly to operate Check voltage and wiring connections; correct voltage.
at different speed.
– Packing box(es) too tight, too loose, wrong packing, Adjust, relubricate or replace packing; align box(es).
packing dried out and/or worn out, out of alignment. Realign or replace seals or parts.
Mechanical seals misaligned, broken or worn out.
– Solids or liquids in, or passing through machine. Disassemble, inspect and clean machine, install filter to
prevent further contamination.
– Machine operating in surge or unbalanced flow range. Increase air flow to stop surge condition.
– Stacked Impeller hub nuts too tight. Loosen hub nuts 1/2 turn.
– Belts on belt drive machine loose – slapping. Tighten belts to proper tension.
– Harmonic pulsation from gas engine driver. Do not operate at this speed! Change motor speed
enough to remove harmonic pulsation.
– Machine not mounted on solid foundation, i.e., on Re-inforce foundation.
unstable catwalk, etc.
Motor Hot (Can be Incorrect motor selection:
checked with surface – Ambient temperature too high for insulation class. Cool motor or replace with motor having proper insulation.
thermometer. Refer – Incorrect voltage. Change to correct voltage.
to factory for decision – Incorrect cycle. Change to correct cycle.
as to whether or not – Electrical short-circuit insulation failure. Repair or replace motor.
it is too hot.) – Motor overloaded – blower too small for system. Install larger motor and/or blower.
Unbalanced voltage supply:
Applies to gas boosters only. Check with power company for correction.
Refer to page 5 for Replacement Parts information.