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5. Electrical Connection
5.1 The electrical connection should
be carried out in accordance
with local regulations. Never
make any connections unless
the electricity supply has been
switched off.
5.2. The electrical hazard warning
mark is placed outside the
connection box. Be careful.
5.3. Electrical data (voltage and frequency)
are shown on the pump nameplate.
Verify if these data match your electricity
supply. A Residual current device (RCD,
30mA) should be installed and the
grounding be properly connected for
your safety.
5.4. Motors must be connected to a motor-
protective circuit breaker which can be
manually reset. Set the motor-protective
circuit breaker according to the rated
current of the motor. See nameplate.
5.5. Make electrical connection in accordance
with connecting diagram located inside
the connection box. The motor current
must be within the rated amps range
indicated on nameplate. Three phase
motor requires a magnetic starter for
safety.
5.6. For three phase motors, please check the
correct direction of rotation of the pump
on the motor fan cover. When seen from
motor fan cover end, the pump should
rotate clockwise. You can reverse the
direction of rotation by interchanging
any two of the incoming supply wires.
5.7. If the supply cord is damaged, it must be
replaced by the manufacturer, its service
agent or similary qualified persons in
order to avoid a hazard.
5.8. The user shall install a over-load
protection device for the pump runing.
6. Start-up
Before starting the pump, make sure the
following:
6.1. For three phase motors, verify if the
rotating direction is correct. It should be
clockwise viewing from the motor fan
cover end.
6.2. All piping joints are completely tight.
Leakage in piping may cause the pump
hydraulic loss.
6.3. The pump is filled with liquid.
6.4. The suction filter is not blocked by any
foreign objects.
7. Operation and Maintenance
It is dangerous to operate the
pump against a closed discharge
outlet because it will cause
extremely high liquid flow temperature and
damage the pump in a few minutes.
7.1. Lubrication
The mechanical seal and shaft sleeves
are lubricated by the pumped liquid.
7.2. Suction filter
Always keep suction filter clean and
make sure it is not blocked by impurities.
7.3. Periodic checks
The following checks should be carried
out periodically to ensure the normal
operation.
7.3.1. Check the quantity of liquid and
operating pressure.
7.3.2. Check there are no leaks on piping
joints.
7.3.3. Check the tripping of the motor
starter.
7.3.4. Check that all controls are functioned
normally.
7.4. When pump is not in use for a period,
it should be drained. For start up after
long time inactivity please check if the
impeller and mechanical seal are free.
If they are locked up by sand, rust or
something else please clean them up.
7.5. The pump must not be used to transfer
explosive liquids. In systems with hot
liquids (over 60°C), extra caution should
be exercised to prevent from personal
injury.
7.6. The pump should not be used to transfer
toxic or contaminated liquids. Please
carefully follow all instructions in the
manual as Walrus may refuse to accept
the contaminated pump for servicing.
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