Circuit Diagram; Commissioning; Maintenance - EBARA 4WN Series Original Instruction Manual

7.1. Circuit diagram

L1
0 I
T
1
2-wire
Abbreviation Designation
L1 Live wire
N Neutral wire
PE Protective earth
T Thermal protector

8. Commissioning

A bend and a shut-off valve should be installed in the wellhead
before the pump is connected to the consumer pipeline outside
the borehole. The pump must never be run at maximum flow rate
under any circumstances when starting the pump up for the first
time. Close the shut-off valve before you start the pump and open
it slowly and carefully in stages as the pump runs in.
Do not run the pump against the closed shut-off valve
CAUTION
for longer than 5 – 6 seconds, otherwise the motor
can overheat and burn out; this would result in a total
loss which is not covered by the warranty.
Never open the shut-off valve suddenly as there
CAUTION
could be sand or sludge deposits.
Warning
Always ensure that you are wearing shoes when
starting the electrical pump and make sure that your
hands are dry.
Only open the shut-off valve partially during the first 10 – 20
minutes after start-up so as to obtain a low flow rate. This low
flow rate prevents the running components of the pump from
seizing up in the event of any excessive amounts of sand in the
water. Immediately after switching the pump on, take an adequate
N PE
2
1~
Cable
black
blue or grey
yellow/green
---
sample of the pumped water to fill a larger container and wait for
any solids present in the water to settle. If the water only contains
a small amount of sand – or none at all – open the shut-off valve
and continue pumping until the water is clear.
If there is an excessive amount of sand in the water,
CAUTION
remove the pump and use a suitable pump to pump
the borehole clear before reinstalling the 4WN
borehole pump. The 4WN borehole pump set is not
designed for pumping water with a high sand content
and breakdowns of this kind are not covered by the
warranty.
Pumping sandy water reduces the service life of the pump.
Let the pump run for a period of at least 30 minutes.
Afterwards, measure the water level in the borehole to make sure
that the water level has not fallen below the pump intake
opening.
Monitor the water level in the borehole continuously;
CAUTION
allowing the water level to get too low can lead to
damage to the pump and motor as well as dangerous
pressure surges.

9. Maintenance

i
Warning
Make sure without fail that you disconnect the power
supply before commencing any work on the pump
set. Ensure that no-one can switch the power supply
back on again inadvertently before completion of any
such work.
Although 4WN borehole pump sets are maintenance free, we
recommend carrying out a regular check of maximum pressure.
Maximum pressure can be checked by running the pump against
the closed shut-off valve for a short period and reading off the
pressure performance with the help of a pressure gauge.
Do not run the pump against the closed shut-off valve
CAUTION
for longer than 5 – 6 seconds, otherwise the motor
can overheat and burn out; this would result in a total
loss which is not covered by the warranty.
A reduction in pressure could be a sign that the pump is worn,
whereas an increase in flow could be an indication of a pump
overload.
Please contact your service partner for further diagnoses and
measurements.
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