EBARA EVMSN Serie Instrucciones Originales página 17

Check the hydraulic part. Remove the
Hydraulics blocked
foreign bodies, blocking the impeller.
Check whether the calibration of the
Overload protection tripped or amperometric protection has been properly
not properly calibrated. calibrated (maximum line current value of
the motor).
Undersized or damaged Verify proper functioning of the capacitor. If
capacitor (motor 1 ~). necessary, provide for a larger capacitor.
Motor burned down due to Measure the insulation resistance of the
insulation fault, overheating or winding towards the grounding and make
overload (unsuitable liquid). sure it is greater than 10MΏ
Check how many stages have been
connected in the terminal box of the motor
Powered by 2 phases
and check the actual presence of voltage
(motor 3~).
on the 3 stages using a voltmeter, during
pump operation.
the motor turns
Decrease in the line voltage Wait for voltage to return to normal
Suction filter / hole blocked Clean the filter / hole
Release or clean the valve and check that it
Foot valve blocked (**)
works properly
Pump has not been filled (**) Fill (sect. 10)
Water level low (if no
Restore water level
protection system is fitted) (**)
Prime the pump
Pump not primed Check any delivery non-return valves
Check the liquid level
Pressure too low Restrict the delivery gate
(*) If you encounter the same trouble again, call our Servicing Department
(**) Caution: mechanical seal could be damaged
14.2 THE PUMP WORKS
with a reduced flow rate
System undersized Reviewing the system
System dirty Clean the piping, valves, filters
Switch off the pump or immerse the foot
Water level too low
valve
Incorrect motor rotation
Reverse phases
direction (only three-phase).
Supply the pump with the voltage indicated
Incorrect supply voltage
on the ate
Leaks from piping Check the joints
Pressure too high Recheck the system
Correctly prime the suction pipe section
Incorrect priming / No priming
(check instructions on the manual)
Verify proper non-return valve functioning. If
Non-return valve blocked
necessary, replace.
Check the status of the impeller (check
Wear of the hydraulic part. the compatibility of the material with the
pumped liquid)
Check the density and viscosity of the
Improper liquid
pumped liquid (contact sales department).
14.3 PUMP STOPS AFTER RUNNING FOR SHORT TIME
as a result of thermal overload protection tripping
Supply voltage outside motor's Check whether there are excessive drops in
accepted range voltage due to undersized line or cables
Check whether the calibration of the
amperometric protection has been properly
Inadequate thermal calibration
calibrated (maximum line current value of
the motor)
- Reduce flow rate,
throttling the delivery line or replace motor
Motor overload due to dense with more powerful one
and/or viscous liquid - Check actual power
absorbed by the pump based on liquid
pumped
Pump delivers liquid at higher
rate than max. flow rate on Reduce flow rate by throttling delivery line
rating plate
Panel exposed to sun or other Protect panel from sun or
sources of heat sources of heat.
- Disassemble and
Foreign matter brakes impeller clean pump
rotation - Call our nearest
Servicing Department to do the job
Worn motor bearings Replace bearings.
The temperature exceeds the technical
Liquid temperature too high
limits of the pump
Internal fault Contact the nearest retailer
for pressure applications
The difference between
Increase the difference between the two
maximum and minimum
pressures
pressure is minimal
14.4 THE PUMP DOES NOT STOP
Electrical / electronic
components faulty/not working. Contact our sales network.
Level sensors not working. Verify proper operation of level sensors.
Non-compliant / unsuitable
Contact our sales network.
use.
for pressure applications
Set maximum pressure at a
Maximum pressure too high
lower value
14.5 THE PUMP VIBRATES
is too noisy during operation
Flow rate too high Reduce the flow rate
Cavitation Contact the nearest retailer
Irregular piping Fix in a better way
Noisy bearing Contact the nearest retailer
Foreign bodies sliding along
Remove the foreign bodies
the motor fan
Incorrect priming Bleed the pump and/or fill it again
EN
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