EBARA BSP SS Operating And Maintenance Manual page 12

required level, it starts the pump again automatically.
6) Liquid level electrodes are connected with cables to the liquid level
control relay.
7) Phase protection relay is used to stop the pump if there is any prob-
lem at one of the phases.
8) Ammeter is used to show the current that motor absorbs.
9) Voltmeter is used to measure the working voltage.
EN
There should be warning lambs on the control panel to warn the user
at the unexpected occasions. Control panels should be insured against
the short circuit. Moreover, their insulation should be well done and
also it should be protected from moisture, dust and water.
8. USE AND STARTING
NEVER ALLOW THE MOTOR-DRIVEN PUMP TO OPERATE WITH-
OUT WATER. DOING SO CAN SERIOUSLY DAMAGE THE INTER-
NAL COMPONENTS.
8.1.GENERAL WARNINGS
Before starting the pump, it must be checked that all controls during the
preparation and all warnings are taken into consideration.
Before starting the pump, voltage of the system should be measured.
This value shouldn't be less than 5% and higher than 10% of the nomi-
nal value for the three phases. If there are more differences at the volt-
ages than the given amounts, it should not be started until the required
voltage is provided for the motor.
Thermal relay on the control panel should be set up depending on the
ampere value on the nameplate of the motor. Thermal relay should be
set up 58% of the motor's nameplate value on the Y/∆ motors.
8.2.STARTING DIAGRAM
For submersible motor pumps working with frequency converter, ad-
justment and programming of the frequency converter should be done
as showed by the attached frequency converter operating instructions,
minimum rpm of the submersible motor pumps is 30 Hz, start/stop
ramp for the motor pumps should keep short (2-3 sec. max. lower
frequency and revolutions and high start/stop ramp can be damage
the motor and the bearings. For correct adjustment to the motor revo-
lutions and start/stop ramp, see frequency converter operating instruc-
tions, adjustments and programming to the device should be done only
by electrically qualified personnel, non-observance is risk of damage to
device and motor and pump, risk of electrical shock!
Failures caused by running the motor pumps by incorrect adjustment
to the device and by non-observance to the instructions, are out of
WARRANTY.
Before starting the pump, the valve on the line should be positioned as
half open. Manometer should be installed between the pump and the
valve to measure the pressure.
Then pump can be started. Pump's discharge pressure can be read
from manometer. Manometer gives the information bout the direction
of rotation because if the pump is rotating in the wrong direction, it
cannot reach the real pressure value level. When the gate valve is
closed, motor should be started to rotate in the both directions for a
few seconds to read the values from the manometer. Right rotation di-
rection is the one that the higher pressure is read from the manometer.
If the pressure value is decreasing steadily during the pump works
although gate valve position is same, it shows that there is a problem.
In this occasion, water level in the well might get lower or there might
be hole or leakage on the pipes one the pressure line or in the well.
Pumps should never be allowed to work at the position that is absorb-
ing more current than their nominal values. lf the current that motor
absorbs is higher than its nominal value on the nameplate of it, the
valve should be closed until this value gets the nominal value lower.
Starting the pump 6" submersible type electric motors are allowed to
have 20 start - stop maximum in one hour.
8" submersible type electric motors are allowed to have 10 start - stop
maximum in one hour.
Exceeding this values and starting the motor more often will damage
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the motor and the failures that will be caused as a result of this situation
are of WARRANTY.
After finding the right rotation direction of the pump, it should be al-
lowed to work at a closer gate valve position for a while.
The amount of sand that comes out of the well should be checked
periodically. Ebara 6" - 8" submersible pumps are resistant to 50 m³/h
respectively. If the amount of sand is higher than these values, pump
will be worn out more than normal and the failures that will be caused
because of these occasions are out of WARRANTY. If the amount of
the sand is higher, then the suggestions should be asked from the
companies that dig wells.Before having the pump work automatical-
ly, settings of the thermal relay should be checked. One of the fuses
should be taken out and motor should be run on two phases for this
control. In this occasion, thermal relay should stop the pump in around
30 - 40 seconds. This trial should be repeated for all three phases and
each time motor starter should be allowed to cool down for 3 and 10
minutes for 6" and 8" motors respectively.
After this control, pump should be allowed to work automatically.
8.3 USE COOLING JACKET
Cooling of submersible motors is provided with the flow of the water
around it. That's allows water flow around motors has vital importance
during submersible pump installation. This flow rate depends on diam-
eter and power of motor. The most important factor of submersible mo-
tors' long service life is that the motor has to be cooled well. Required
flow velocity around the motor is given in the table below for motors
being cooled well enough.
Required flow velocity around the motor is given in the table below for
motors being cooled well enough.
lf the motor will be installed in an open body of water (i.e pool) or di-
ameter of the well is much bigger than the diameter of themotor, Flow
lnducer Sleeve must be used to provide the flow velocities that are giv-
en in the table above, around the motor. Most important factor of sub-
mersible motors long service life is that the motor has to be cooled well.
Motor Type Motor Rating
[kW]
6" Rewindable 5.5 - 18.5
22 - 45
8" Rewindable 30 - 55
60 - 110
10" Rewindable 81 – 220
Required flow inducer sleeve's inside diameter that depends on the
flow rate is given below as a diagram. For example, if a pump that has
a 15 kW motor will be working at 27 m
diameter of the flow inducer sleeve should be selected as 26 cm.
Minimum Water
Flow [m/s]
0.2
0.5
0.2
0.5
0.5
/h flow rate, minimum inside
3