Troubleshooting - EBARA DML Instruction Manual

8 Troubleshooting

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The pump does not start.
The pump starts, but
immediately stops.
The pump can be operated,
but it stops after a while.
Thermal protector is actuated.
Does not pump.
Insufficient pumping rate.
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○ Obstacle inhibits the float movement.
○ Power is failed.
it
○ Large fluctuation of power voltage.
○ Large drop in voltage.
○ Phase is lost.
○ Insufficient connection of power source
circuit.
○ Wrong wiring of control circuit.
○ Fuse is blown.
○ Defective magnet switch.
○ Mal-functioning or defects of float switch,
etc.
○ Actuation of ground fault breaker.
○ Pump catches foreign matter.
○ Motor is burnt out.
○ Break of motor bearing.
○ Mechanical seal stuck.
○ Prolonged dry operation induced the
functioning of Auto-cut.
○ High
liquid temperature
functioning of Auto-cut.
○ High liquid temperature.
○ Long dry operation.
○ Eddy current.
○ Reverse rotation.
○ Broken gate valve.
○ Large voltage drop.
○ Operating the 60Hz pump at 50Hz.
○ High discharge head.
○ Large piping loss.
○ Low operating water level causes air
suction.
○ Liquid leaking from discharge pipe.
○ Clogging of discharge pipe.
○ Adhesion of foreign matter in suction
opening.
○ Foreign matter clogs the pump.
○ Worn impeller.
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○ Remove the obstacle.
○ Request the electric power company for
action.
○ Request the electric power company for
action.
○ Request the electric power company for
action.
○ Inspect the connection section and the
magnet switch.
○ Inspect the power source circuit.
○ Wire in correct state.
○ Replace with adequate fuse.
○ Replace with adequate magnet.
○ Repair or replace the level switch, etc..
○ Repair the electric-leak section.
○ Remove the foreign matter.
○ Repair or replace the motor.
○ Repair or replace the bearing.
○ Repair or replace the mechanical seal.
○ Raise the water level.
○ Lower the water level.
induced the
○ Lower the liquid temperature.
○ Raise the stopping water level.
○ Refer to the section of eddy current.
○ Establish correct rotational direction, (refer
to ６ -2-2).
○ Repair or replace the gate valve.
○ Request the electric power company for
action.
○ Check the nameplate.
○ Review the plan.
○ Review the plan.
○ Raise the water level or lower the pump
position.
○ Inspect and repair the discharge pipe.
○ Remove the foreign matter.
○ Remove the foreign matter.
○ Disassemble the pump to remove the
foreign matter.
○ Replace the impeller.
EBARA
- 14 -
Corporation