6 Commissioning/Start-up/Shutdown
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UPAchrom
NOTE
It is not necessary to delay the start-up of a shut-off element with electric actuator,
as the run-up time of the pump is shorter than the dead time of the shut-off
element.
ü
The pump set has been assembled as described in this manual.
ü
The pump set has been installed as described in this manual.
ü
The power cables, control cables and measuring cables have been fastened and
connected in the switchgear.
ü
The switchgear and protective equipment have been installed and set properly.
ü
The pump set is completely submerged or flooded.
1.
Slightly open the shut-off element on the discharge side.
2.
Start up the pump set.
3.
Slowly open the shut-off element until the duty point is reached.
6.1.2 Checking the direction of rotation
CAUTION
Wrong direction of rotation
Damage to the motor!
▷
Do not run the pump set for more than two minutes when checking the
direction of rotation.
CAUTION
Uncontrolled backflow of the fluid from the riser
Damage to the pump set!
▷
Prevent any
uncontrolled
backflow of the fluid handled with suitable means.
▷
Control
the fluid backflow, e.g. by throttling the gate valve in the discharge
line.
For
single-phase a.c. units
the direction of rotation is fixed and cannot be changed.
For
three-phase units
, check the direction of rotation as described below:
ü
The back-up name plate is attached at the place of installation of the
submersible borehole pump.
ü
The pump set has been installed completely and is sufficiently covered by the
fluid to be handled.
ü
The power supply cable and the measuring and control cables, if any, are
connected to the control cabinet.
ü
The shut-off valve in the discharge line has been closed.
1.
Switch on the motor at the control cabinet.
2.
Read the pressure on the pressure gauge.
3.
Switch off the motor and interchange two phases of the power cable in the
control cabinet.
4.
Start up the motor and read the pressure at the pressure gauge.
5.
Switch off the motor.
ð
The higher reading at the pressure gauge indicates the correct direction of
rotation.
ð
On pumps with free discharge, the correct direction of rotation is indicated
by the greater water volume produced, in fountains by the higher jet.
6.
Wire the motor for the correct result.