EBARA EVMSU - Page 12

EBARA Pumps Americas Corporation
www.pumpsebara.com
12
rev. 01/19
DISPLAYED FAULT
CAUSE SOLUTION
THE PUMP WORKS
with a reduced
rate
System
undersized
Ensure that pump is
sized for the application
System dirty
Clean the piping, val-
Water level
too low
Switch off the pump
or immerse the foot
valve
Incorrect rotational
direction
(three-phase only)
Swap two of the line
phases
Incorrect supply
voltage
Supply the pump with
the voltage indicated
on the nameplate
Leaks from
pipingCheck the joints
Pressure too high Recheck the system
PUMP STOPS
AFTER
RUNNING FOR
SHORT TIME
as a result of
thermal
overload
protection tripping
Supply voltage out-
side motor’s accepted
range
Check whether there
are excessive drops in
voltage due to under-
sized line or cables
Inadequate thermal
cutout setting
Adjust setting to
motor’s rated current
(see rating
plate)
Motor overload due to
dense and/or viscous
liquid
throttling the discharge
line or replace motor
with more powerful
one
- Check actual power
absorbed by the
pump based on liquid
pumped
Pump delivers liquid
at higher rate than
rating plate
throttling discharge line
Panel exposed to
sun or other sources
of heat
Protect panel from
sun or
sources of heat.
Foreign matter
blocking impeller
rotation
- Disassemble and
clean pump
- Call our nearest
Servicing Department
to do the job
Motor bearing
s worn
- Replace bearings
- In this case, motor
is noisy, too
THE PUMP STOPS
AFTER WORKING
FOR BRIEF
PERIODS
Thermal protection
intervention
Liquid temperature
too high
The temperature
exceeds the
technical limits of the
pump
Internal fault
Contact the nearest
authorized distributor or
service center
DISPLAYED FAULT
CAUSE SOLUTION
THE PUMP STOPS
AFTER WORKING
FOR BRIEF PERIODS
Pressure
applications
The difference
between
maximum and mi-
nimum pressure is
minimal
Increase the differen-
ce between the two
pressures
THE PUMP DOES
NOT STOP
Pressure applica-
tions
Maximum
pressure too high
Set maximum
pressure at a
lower value
THE PUMP
VIBRATES
Or is too noisy du-
ring operation
Flow rate too high
Cavitation
Contact the nearest
retailer
Piping not secured Secure piping
Noisy bearing
Contact the nearest
authorized distributor or
service center
Debris contacting
the motor fan
Remove debris
Incorrect priming
Prime the pump and/
Circuit breaker
trips or fuses
blow when
starting pump
Motor
short-circuited
Check and replace
Short-circuit due to
incorrect connection
Check and reconnect
correctly
GFCI current
circuit breaker trips
as soon as switch
closes
Leakage current caused
by damaged insulation
of motor, cables or
other electric com-
ponents
Check and replace
electric component
with ground fault
Pump performs a
few turns in oppo-
site direction when
stopping
Foot valve leakingCheck, clean or replace
Suction pipe leakingCheck and repair
Pump vibrates and is
unusually noisy
Motor bearings worn Replace bearings
Foreign matter betwe-
parts
- Disassemble and
clean pump
- Call nearest authorized-
service center
Pump operation
affected by cavitation
throttling discharge line.
If cavitation persists,
check:
- Suction height
- Pressure loss along
suction line (diame-
ter of pipe, elbows
etc.)
- Liquid temperature
- Discharge line
backpressure