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NT 1006-C00 03 18 Centrex Multi 2 e
3.6 Alignment of motor/pump and reduction
gearbox/pump shafts
The motor and pump shafts are accurately aligned at the
factory before dispatch, but they should be checked
carefully when received at the site and realigned if
necessary. To align the coupling and the shaft, use a
straight-edge to check the concentricity and thickness
gauges for the angular misalignment.
The 3 figures below show the procedure in detail and the
admissible deviations :
REMINDER
:
A flexible coupling does not avoid to do a good alignment.
Controlling the alignment at each stage of the installation
is important to be sure that none of the following procedu-
res has generated stresses on the unit or the pump :
• after fastening on the foundations.
• after fastening the pipes.
• after the pump has been operated at the normal
operating temperature.
NEVER START A UNIT IF THE COUPLING ALIGNMENT IS
INCORRECT. THIS WILL RENDER OUR WARRANTY INVALID.
3.7 Electric motors
Check that the supply voltage matches the indications
on the motor rating plate.
Comply with the wiring diagram, make sure the wires are
rated for the power and take care with the contacts,
which must be thoroughly tightened. The motors must
be protected by appropriate circuit breakers and fuses.
Connect the regulatory ground connections.
Check the direction of rotation :
This check should be done with no product being pumped,
and both the inlet and discharge circuits vented to avoid
generating unexpected pressure (on the inlet side, for
example). This will avoid damaging either the pump or the
system.
WARNING
OPERATION WITHOUT THE SHAFT
PROTECTOR CAN CAUSE SERIOUS
PERSONAL INJURY, MAJOR PROPER-
TY DAMAGE OR DEATH.
Do not operate
without guard
in place.
WARNING
DISCONNECT THE ELECTRICITY
SUPPLY BEFORE ANY MAINTENAN-
CE OPERATION.
Dangerous voltage.
Can cause
injury and death.
WARNING
DISCONNECT THE ELECTRICITY
SUPPLY BEFORE ANY MAINTENAN-
CE OPERATION.
Dangerous voltage.
Can cause
injury and death.
WARNING
TAKE ALL NECESSARY MEASURES
TO RENDER ANY START-UP, EVEN
ACCIDENTAL, OF THE PUMP DURING
THE WORK IMPOSSIBLE.
Any unforeseen start-up
can cause serious
injuries or important
material damages.
WARNING
PUMPS OPERATING AGAINST A CLO-
SED VALVE CAN CAUSE SYSTEM
FAILURE, PERSONAL INJURY AND
PROPERTY DAMAGE.
Hazardous pressure
can cause
personal injury
or property damage.
WARNING
OPERATION WITHOUT THE SHAFT
PROTECTOR CAN CAUSE SERIOUS
PERSONAL INJURY, MAJOR PROPER-
TY DAMAGE OR DEATH.
Do not operate
without guard
in place.
Carry out the control at four points :
at the top ‐ at the bottom ‐ left ‐ right
Correct
Bad alignment
Angular fault
3. INSTALLATION (continued)
