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–
If the motor is used with partial load,
then set the value to the operating
current (for example measured with a
current pincer).
–
If the pump has a star-delta starting
system, then adjust the thermal relay
to 58% of the nominal current or
operating current (only for three-phase
motors).
5 Commissioning, Startup,
Operation, and Shutdown
Precautions
WARNING:
Make sure that the drained liquid
does not cause damage or injuries.
The motor protectors can cause the
motor to restart unexpectedly. This
could result in serious injury.
Never operate the pump without the
coupling guard correctly installed.
CAUTION:
The outer surfaces of the pump and
motor can exceed 40ºC (104ºF)
during operation. Do not touch with
any part of the body without
protective gear.
Do not put any combustible material
near the pump.
NOTICE:
Never operate the pump below the minimum
rated flow, when dry, or without prime.
Never operate the pump with the delivery on-
off valve closed for longer than a few seconds.
Never operate the pump with the suction on-
off valve closed.
Do not expose an idle pump to freezing
conditions. Drain all liquid that is inside the
pump. Failure to do so can cause liquid to
freeze and damage the pump.
The sum of the pressure on the suction side
(mains, gravity tank) and the maximum
pressure that is delivered by the pump must
not exceed the maximum working pressure
that is allowed (nominal pressure PN) for the
pump. See
Figure
3.
Do not use the pump if cavitation occurs.
Cavitation can damage the internal
components.
5.1
Fill the pump
For information about pump connections, see
10.
Installations with liquid level above the pump
(suction head)
1.
Close the on-off valve located downstream
from the pump.
2.
Open the screwed plugs (PM2)
3.
Open the on-off valve upstream until the
water flows out of the hole.
4.
Close the screwed plugs.
Installations with liquid level below the pump
(suction lift)
1.
Open the on-off valve located upstream from
the pump
2.
Close the on-off valve located downstream
from the pump.
3.
Open the screwed plugs (PM2).
4.
Fill the pump until the water flows out of the
hole.
5.
Close the screwed plugs.
5.2
Check the rotation direction
Follow this procedure before start-up.
1.
Locate the arrows on the adaptor or the
motor fan cover to determine the correct
rotation direction.
2.
Start the motor.
3.
Quickly check the direction of rotation
through the coupling guard or through the
motor fan cover.
4.
Stop the motor.
5.3
Start the pump
The responsibility for checking the correct flow and
the temperature of the pumped liquid rests with the
installer or owner. Before starting the pump, make
sure that:
The bearings are already filled with grease
and therefore ready for operation.
Pump and suction pipe must be filled
completely with liquid when starting up (for
instructions see
Turn pump unit once again by hand and
check that it moves smoothly and evenly.
Check that coupling guard is installed and
that all safety devices are operational.
Switch on any sealing, flushing or cooling
devices that are provided.
Open valve in suction/intake pipe.
Set the pressure-side on-off valve to approx.
25% of the pump rate for which the system
was designed. For pumps with a drive output
lower than 30 kW, the on-off valve may also
remain closed briefly upon startup.
Secure, that unit is electrically connected
according to all regulations and with all safety
devices.
Start the pump. At the expected operating
conditions, the pump must run smoothly and
quietly. If not, refer to Troubleshooting.
6 Maintenance
Precautions
Figure
en - Original instructions
chapter
5.1)
Electrical Hazard:
Disconnect and lock out electrical
power before installing or servicing the
unit.
WARNING:
Maintenance and service must be
performed by skilled and qualified
personnel only.
Observe accident prevention
regulations in force.
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