EBARA Submersible Semi-vortex Sewage Pumps
DVSU/DVSHU
Operating, Installation, and Maintenance
Troubleshooting
CAUTION
All service should be done by factory trained or qualified personnel only.
Trouble
Cause
Remedy
Does not start.
(1) Power failure
(1)-(3) Contact electric power company; devise counter-measures
Starts, but
(2) Large discrepancy between power source and voltage
immediately stops.
(3) Significant drop in voltage
(4) Motor phase malfunction
(4) Inspect connections and magnetic switch
(5) Electric circuit connection faulty
(5) Inspect electric circuit
(6) Faulty connection of control circuit
(6) Correct wiring
(7) Blown fuse
(7) Replace with correct type of fuse
(8) Faulty magnetic switch
(8) Replace with correct type of magnetic switch
(9) Water is not at level indicated by float
(9) Raise water level
(10) Float is not in appropriate level
(10) Move float to an appropriate starting level
(11) Float defective
(11) Repair or replace
(12) Short circuit breaker is functioning
(12) Repair location of short circuit
(13) Foreign matter clogging pump
(13) Remove foreign matter
(14) Motor burned out
(14) Repair or replace
(15) Motor bearing broken
(15) Repair or replace
Operates, but stops
(1) Prolonged dry operation has activated motor protector (1) Raise stop water level
after a while.
and caused pump to stop
(2) High liquid temperature has activated motor protector
(2) Lower liquid temperature
and caused pump to stop
Does not pump.
(1) Reverse rotation
(1) Correct rotation (see Operation 2, (3))
Inadequate volume.
(2) Significant drop in voltage
(2) Contact electric power company and devise
counter-measures
(3) Operating a 60Hz pump on 50Hz
(3) Check nameplate
(4) Discharge head is high
(4) Recalculate and adjust
(5) Large piping loss
(5) Recalculate and adjust
(6) Low operating water level causes air suction
(6) Raise water level or lower pump
(7) Leaking from discharge piping
(7) Inspect, repair
(8) Clogging of discharge piping
(8) Remove foreign matter
(9) Foreign Matter in suction inlet
(9) Remove foreign matter
(10) Foreign matter clogging pump
(10) Disassemble and remove foreign matter
(11) Worn impeller
(11) Replace impeller
Over current
(1) Unbalanced current and voltage
(1) Contact electric power company and devise counter-measure
(2) Significant voltage drop
(2) Contact electric power company and devise counter-measure
(3) Motor phase malfunction
(3) Inspect connections and magnetic switch
(4) Operating 50HZ pump on 60Hz
(4) Check nameplate
(5) Reverse rotation
(5) Correct rotation (see Operation 2)
(6) Low head; excessive volume of water
(6) Replace pump with low head pump
(7) Foreign matter clogging pump
(7) Disassemble and remove foreign matter
(8) Motor bearing is worn or damaged
(8) Replace bearing
Pump vibrates;
(1) Reverse rotation
(1) Correct rotation
excessive operating
(2) Pump clogged with foreign matter
(2) Disassemble and remove foreign matter
noise.
(3) Piping resonates
(3) Improve piping
(4) Gate valve is closed too far
(4) Open gate valve
Single phase motor:
(1) Defective start capacitor
(1) Replace start capacitor.
Motor hums, but will not
(2) Defective relay:
run, over load trips.
a) Check relay coil with continuity meter
(2a) Replace relay if open coil is found
In approximately 15-20
b) Check for loose or broken connection in relay and
(2b) If circuit is intact, replace start capacitor and restart motor
seconds. After an off
start capacitor circuit
time of 30-60 seconds,
c) If after step (2b) motor fails to start, check with
(2c) If no continuity is indicated, replace relay
overload protector will
continuity indicator across terminal 162
reclose. If motor again
(3) Defective motor; if motor fails to start after replacing
(3) Check motor for electrical and mechanical defects
hums and overload trips,
relay (start or run capacitor if used), motor may be
the fault is probably due to defective
either a defective start
capacitor or relay, or
perhaps the motor itself.
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