Troubleshooting - EBARA DML Originalanleitung

12. TROUBLESHOOTING

If you encounter a fault that is not contemplated in the following table, contact the nearest authorized dealer.
EN
PROBLEM
The pump fails to start
The pump starts but immediately stops
The pump starts but stops
after a short period of time
The overload protection tripped
Insufficient flow
Over current
The pump vibrates
emitting loud noise
12
CAUSE
An obstacle is preventing float movement
Power failure
Large voltage fluctuation
Large voltage drop
Loss of phase
Incorrect power circuit connection
Incorrect control circuit connection
Burnt fuse
Defective magnetic contact
Float switch malfunction or defect, etc.
Protection switch triggered by earth fault
The pump has sucked in a foreign object
The motor has burnt out
A motor bearing is broken
Mechanical seal is stuck
Dry operations for a prolonged period caused
the motor protection to trip
High liquid temperature caused the motor
protection to trip
High liquid temperature
Prolonged dry operations
Over current
Opposite rotation
Gate valve broken
Large voltage drop
Pump operations from 60 Hz to 50 Hz
High head
Significant leaks in the pipes
Low water level that causes air to be sucked in
Liquid leaks from the delivery pipe
Delivery pipe clogged
Foreign object obstructing the suction port
A foreign object is clogging the pump
Rotor damaged
Large power voltage fluctuations
Large voltage drop
Loss of phase
Pump operations from 50 Hz to 60 Hz
Pump operations with opposite rotation direction
Excessive flow
The pump sucked in a foreign object
The motor bearing is broken
Pump operations with opposite rotation direction
The pump sucked in a foreign object
Resonance on delivery pipes
ACTION
Remove the obstacle
Request electrical company intervention
Request electrical company intervention
Request electrical company intervention
Inspect connections and the circuit breaker
Inspect the power circuit
Correct electrical connections
Replace with suitable fuse
Replace with one in good working order
Repair or replace the level switch, etc.
Repair the section where current is dispersed
Remove the foreign object
Repair or replace the motor
Repair or replace the bearing
Repair or replace the mechanical seal
Increase the water level
Lower water temperature
Lower water temperature
Increase the minimum water level
Refer to the section of over current
Reverse the two phases
Repair or replace the gate valve
Request electrical company intervention
Check nameplate
Review system layout
Review system layout
Increase the water level or lower the pump position
Inspect and repair the delivery pipe
Remove the foreign object
Remove the foreign object
Remove the foreign object
Replace the rotor
Request electrical company intervention
Request electrical company intervention
Inspect the power connections and circuit breaker
Check nameplate
Check rotation direction (see chapter 9)
Reduce gate valve opening. If no gate valve is used,
replace the pump with an adequate one
Remove the foreign object
Repair or replace the bearing
Check rotation direction (see chapter 9)
Remove the foreign object
Adjust the pipe