Mas Grup
6
6.3.2. Motor Protection
• Three phased-motor shall be connected to power supply.
• Wait the motor to cool down when thermic protected motor breaks in
circuit due to the overheating. Make sure the motor does not start
automatically until it cools completely
• In order to protect the motor from overcharging and short circuit use a
thermic or thermic-magnetic relay. Adjust this relay to the nominal
current of the motor.
Electrical equipments, terminals and the components of the control
systems may carry electric current even though they are not
operating. They may cause deadly and serious injuries or
irreparable material damages.
7. COMMISSIONING, START UP AND OPERATING
7.1. Preparations Before Start Up
Check pump seals
Make sure that the pump and the suction pipe is completely filled with
water before the starting. If the pump operates on a positive suction
head, no problem will be encountered. Suction valve is opened and air
drains are un-tightened.
Pumps with foot valve are filled with water by opening the pump filling
tap or, one takes advantage of the water accumulated in the discharge
pipe and by using a small valve the check valve is bypassed and the
pump is filled.
In vacuum pump driven pumps, by operating the vacuum pump one
achieves to fill the pump via increasing the water level in the suction
pipe.
Do not start your pump dry (WITHOUT WATER).
7.2. Checking The Direction of Rotation
• The direction of rotation is indicated on the pump label with an arrow.
Apart from special cases, it is clockwise direction when looking from the
motor end. Observe if the pump is rotating in the expected sense by
starting the motor for a very short instant. If it is turning in the opposite
sense, interchange any of two motor leads.
• If the motor connection is delta, open the discharge valve slowly.
• If the motor connection is star-delta, set the time relay to maximum 5
seconds. Monitor the passage from star to delta by pressing the start
button. As soon as you are assured that the connection is delta, open
the discharge valve slowly. Continue opening the valve until you read
the amperage on the electrical panel
• One should always check the labels which show the direction of
rotation and the direction of fluid flow. If you dismount the
coupling protection to monitor the direction of rotation, do not
restart the engine before remounting the protection.
As a result of getting in touch with rotating and stable parts each
other temperature increase can occur. Never check the direction of
rotation while the pump is dry.
7.3. Start up Procedure
Check if the suction valve is open and the discharge valve is closed.
Start the motor
Wait until the motor reaches sufficient speed. (In Star-delta
connections, wait until the engine passes to delta connection.)
Keeping an eye on the amperage shown on the panel, open the
discharge valve slowly.
In the primary operation, if the discharge pipe is empty, do not open the
valve completely. By keeping an eye on the amperage, open the valve
with care regarding that it should not exceed the value indicated on
pump’s label.
After opening the valve completely, check the pressure from the pump
exit manometer and make sure that this value is the pump operating
pressure value and is indicated on pump’s label.
If the value one reads is less than the pump label value when the valve
is completely open, it means that the height is miscalculated. Increase
the value by narrowing the valve and bring it to pump’s label value.
If the value one reads is greater than the pump label value when the
valve is completely open, it means that the height is calculated less
than what it should be in reality. The device is pumping less than what
is requested. Check the installation and the calculations.
Minimum flow rate: If the pump is working with zero flow rates (closed
valve) from time to time during its operation, the water inside the pump
may endanger the pump by getting warmed up. In such cases, a
minimum flow valve must be connected to the pump exit.
Stop the motor if the pump gets too hot. Wait until it gets cold.
Then start the system up again carefully.
7.4. Shut Down Procedure
During sudden start ups and stops, a pressure reducing valve must be
placed at the exit section of high flow rate pumps whose discharge
pipelines are long, in order to reduce water hammer effect. Water
hammer may explode the pump.
In normal conditions (apart from sudden power shut down, etc), stop the
pump as below:
• Close the discharge valve slowly
• Switch the power off, stop the motor. Notice that the rotor slows down.
• Do not start up the motor at least before 1 to 2 minutes.
• If the pump will be out of use for a long time, close the suction valve
and auxiliary circuits. If the pump is outside and if there exists a danger
of frost, remove all drain taps and empty all the water inside the pump.
(5.2. Storage)
If the pump is outside and if there exists a danger of frost, remove
all drain taps and empty all the water inside the pump.
8. MAINTENANCE
Maintenance operations must be done by authorized personnel with
protective clothing only. The personnel must also beware of high
temperatures and harmful and/or caustic liquids. Make sure that the
personnel read carefully the manual.
• The instructions in Safety Precautions must be executed during
maintenance and repair
• Continuous monitoring and maintenance will increase the engine’s and
pump’ s lives.
The instructions below should be applied.
To Next Page
Loading...
Need help?
General
