Installation
1. Check the following before beginning installation.
Insulation resistance measurement:
With the motor and cable (excluding the power supply cable) immersed in water, use a Megger to measure
the insulation resistance between ground and each phase of the motor, and again between each phase of
the motor. The Megger should indicate an insulation resistance of
not less than 20mega ohms
. While
making the measurement, keep the power supply cable off the ground.
We recommend that an auxiliary pump be kept on hand in case of emergency.
2. Installation-
(1)
! WARNING :
Under no circumstances
should cable be pulled while the pump is
being transported or installed.
Attach a chain or rope to the grip and
install the pump.
(2) This pump must not be installed on its
side or operated a dry condition. Ensure
that it is installed upright on a secure
base.
(3) Install the pump at a location in the tank
where there is the least turbulence.
(4) If there is a flow of liquid inside the tank,
support the piping where appropriate.
Install piping so that air will not be
entrapped. If piping must be installed in
such a way that air pockets are
unavoidable, install an air release valve
wherever such air pockets are most likely
to develop.
(5) Do not permit end of discharge piping to
be submerged, as backflow will result
when the pump is shut down.
(6)
! WARNING :
Non-automatic pumps
(models
EF,EA
), have an automatic
operating system bump operating water
level near the minimum operating level
as the automatic cut-off switch
incorporated inside the motor will be
activated
.
To avoid dry operation
,
install
an automatic operating system, as
shown in
Fig-1
and maintain a safe
operating water level.
(7) For automatic pumps (models
EF-A
),
install the floats as shown in
Fig-2.
The
pump may not start if a floats switch
touches the wall of the water tank or the
piping. Install the floats so that this will
not happen.
H1
: Lowest water level (Motor flange)
H2
: Operating water level
This must be above the top of the motor
Fig-2
Operating Water Level
Stop Water Level
Fig-1
H
2
H
1
off
on
on
Troubleshooting
Trouble
Cause
Remedy
(1) Power failure
(2) Large discrepancy between power source and
voltage
(3) Significant drop in voltage
(1)~(3) Contact electric power
company and devise
counter-measures
(4) Motor phase malfunction
(4) Inspect electric circuit
(5) Electric circuit connection faulty
(5) Correct wiring
(6) Faulty connection of control circuit
(6) Inspect connections and magnetic
switch
(7) Fuse blown
(7) Replace with correct type of fuse
(8) Faulty magnetic switch
(8) Replace with correct one
(9) Water is not at level indicated by Float
(9) Raise water level
(10) Float is not in appropriate level
(10) Adjust the position of float
(11) Float effective
(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
Does not start.
Starts, but
immediately stops.
(15) Motor bearing broken
(15) Repair or replace
(1) Prolonged dry operation has activated motor
protector and caused pump to stop
(1) Raise stop water level
(2) High liquid temperature has activated motor
protector and caused pump to stop
(2) Lower liquid temperature
Operates, but stops
after a while.
(3) Reverse rotation
! WARNING :
(3) Correct rotation
(1) Reverse rotation
(1) Correct rotation(see Operation)
(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) Remove foreign matter
Does not pump.
Inadequate volume.
(11) Worn impeller
(11) Replace impeller
(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
! WARNING :
(5) Correct rotation (see Operation2)
(6) Low head. Excessive volume of water
(6) Replace pump with low head pump
(7) Foreign matter clogging pump
(7) Remove foreign matter
Over current
(8) Motor bearing is worn or damaged
(8) Replace bearing
(1) Reverse rotation
(1) Correct rotation
(2) Pump clogged with foreign matter
(2) Disassemble and remove foreign
matter
(3) Piping resonates
(3) Improve piping
Pump vibrates;
excessive operating
noise.
(4) Gate valve is closed too far
(4) Open gate valve
Fig-1
H
2
H
1
off
on
o
u
tl
e
t
Fig-2
Operating Water Level
Stop Water Level
o
u
tl
e
t
EFS-A
pump
EFS
