EBARA EVMSN3 Operating And Maintenance Manual page 16

11.2 STARTING
Once the unit has been hooked up electrically and to the water circuit and charged
with water, check its direction of rotation before using it.
a) Start the electric pump with the delivery valve closed.
b) Check that the motor rotates clockwise (starting from the fan end the
direction is also marked by an arrow on the top mount) by looking through the
slots in the fan cover. This is best seen when starting or stopping the motor.
c) If it is rotating in the wrong direction (counterclockwise), shut off power and
swap two of the motor's power phases in the electrical enclosure or terminal
block.
d) Start the pump two or three times to check system conditions;
e) restrict the delivery to cause a rapid pressure increase for a few times;
EN
f) make sure that the noise, vibration, pressure and electrical voltage levels are
normal.
g) while driving loosen the vent cap until the water comes out; screw the cap
back on until it is locked tight.
11.3 RUNNING
Start the pump with the isolating valve on the delivery line closed, then open it
gradually. The pump must operate smoothly and quietly. Close the isolating valve
again and make sure that the reading on the delivery line's pressure gauge is
close to the Hmax value as indicated on the rating plate. (This approximation is
mainly attributable to tolerances and to possible suction lift). If the pressure gauge
reading is much lower than Hmax, repeat filling (air in pump).
If the two values are close, it means the pump is working properly and any trouble
with the isolating valve open is almost always a result of motor system problems
of an electrical or mechanical nature or, much more commonly, of pump cavitation
due to:
– excessive difference in height or excessive pressure loss along suction line,
– delivery line backpressure too low;
– problems associated with liquid temperature.
For more information on the factors that reduce and/or compromise suction lift
and hence the pump's performance, see the troubleshooting section in chap. 14.
Note that for temperatures and altitudes higher than those specified, the motor's
output is reduced and you will need to have a motor with greater output or is
necessary to reduced the request motor's performance. See chap. 15.2 on the
subject. Make sure there is no water hammer or pressure peaks in the system
caused by fast-closing valves exceeding 1.5 times the pump's nominal pressure.
In the long run, they can cause damage to the actual pump. Avoid operating the
pump with the isolating valve on the delivery line closed for any more than a few
seconds. You should also avoid using the pump for continuous duty with a flow
rate below the minimum rate indicated on the rating plate as this may result in
the liquid being pumped overheating and in the unnecessary overloading of
pump or motor bearings.
11.4 STOPPING
a) Gradually interrupt water circulation in the delivery section to avoid
overpressure in the piping and pump caused by water hammering;
b) Cut off the power supply.
12. MAINTENANCE AND REPAIRS
Before commencing any maintenance work on the
motor-driven pump, turn off the power.
The electric pump has no need of scheduled maintenance; however, you should
periodically check that it is running properly depending on the fluid being pumped
and the operating conditions; check in particular for abnormal running noise and
vibration.
Said checks may give you a rough idea of what preventive repairs are required, if
any, instead of having to perform repairs following sudden problems.
The main and most common special maintenance operations are generally as
follows:
− replacement of mechanical seals
− replacement of grommets
− replacement of bearings
− replacement of capacitors. (where present)
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Nonetheless, even these parts typically subject to wear may last a very long time
if the pump is used correctly.
When the pump remains inactive for a long period, it should be emptied
completely, removing the discharge and filling caps, washed carefully with clean
water then emptied. Do not leave water deposits inside. This operation must
always be carried out whenever there is a chance of frost in order to avoid the
breakdown of the pump components.
When performing repair work, order original spare parts
from our sales and customer support network.
Non-original spare parts can damage the product and are a
hazard for persons and property.
12.1 REPLACEMENT OF SHAFT SEAL
In case of explanations, contact our assistance centre.
13. DISPOSAL
This product falls within the scope of Directive 2012/19/EU regarding the
management of electrical and electronic equipment waste (WEEE).
Electronic-electrical equipment must not be disposed of with domestic waste as
it is made of various materials that can be recycled at the appropriate facilities.
Inquiries should be made through the municipal authorities regarding the
location of the ecological platforms that receive products for disposal and their
subsequent correct recycling.
Furthermore, it is worth remembering that, upon purchase of an equivalent
appliance, shops are obliged to collect the product for disposal free of charge.
This product is not potentially dangerous for human health and the environment,
since it does not contain harmful substances as per Directive 2011/65/EU
(RoHS), yet if abandoned in the environment it has a negative impact on the
ecosystem.
Read the instructions carefully before using the appliance for the first time. It is
recommended that you do not use this product for any purpose other than that
for which it was intended; there is danger of electric shock if used improperly.
The crossed-out bin symbol found on the appliance label indicates
the compliance of this product with the regulations regarding
electrical and electronic equipment waste.
Abandoning the appliance in the environment or its illegal disposal
is punishable by law.
14. TROUBLESHOOTING
14.1 THE PUMP DOES NOT WORK
the motor does not turn
No electricity Check the electrical supply meter
Plug not inserted Check the connection to the power supply
Check the terminal board and the electrical
Incorrect electrical connection
panel
Automatic switch triggered or Reset the switch or replace the fuses and
fuses blown (*) verify the cause
Float sticking Check that the float reaches the level ON
Thermal protection activated It reactivates automatically
(single phase) (single phase only)
Built-in thermal overload
Wait for built-in thermal overload protection
protection device (if fitted) or
device to reset or reset thermal cutout in
thermal cutout in control panel
control panel
tripped (*)
Device protecting against dry Check water level and/or correct connection
running tripped (*) of system devices
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