en – Original instructions
e-IXP(A), e-IXPC(A), e-IXPF(A) – Additional Installation, Operation and Maintenance Manual
33
•
Disconnect the power supply
•
Invert two of the three wires of the power supply cord.
6.
Check the direction of rotation again.
5.3
Start-up
DANGER: Explosion hazard due to excessive temperature
Do not keep the on-off valve on the discharge side in the closed position in order to throttle
the pump for more than a few seconds. If the unit has to operate for more than a few seconds
with closed discharge valve or for a longer period below the minimum flow, a bypass circuit
must be installed that is either permanently active or controlled by a minimum flow valve, to
prevent overheating of the fluid in the pump.
Checks before starting the unit
Perform checks after the following events:
•
The first installation
•
Extraordinary maintenance
•
A period of inactivity.
Check:
•
The mechanical installation
•
The electrical installation
•
The motor rotation direction
•
That the unit has been filled with the required fluid and vented
•
That all the required auxiliary connections and mechanical seals are in place
•
The presence and level of the lubricating oil.
Start up
1.
Shut off the discharge on-off valve almost completely.
2.
Fully open the suction on-off valve.
3.
Start the unit.
4.
Gradually open the discharge on-off valve and adjust it until the duty point is reached, as
soon as the motor reaches full speed
5.
With the unit in operation, check that:
•
No liquid is leaking from the unit or piping system
•
The nominal pressure is higher than the maximum pressure delivered by the unit
•
The current absorbed is within the rated limits.
Note: an automatic restart may only take place if it is made sure that the pump remains filled
with liquid when it is at a standstill.
Operation limits:
Flow min. / max.:
If no other data are given in the performance curves or data sheet, the following is valid:
Q
min
= 0,1 x Q
BEP
for short term operation
Q
min
= 0,3 x Q
BEP
for continuous operation
Q
max
= 1,2 x Q
BEP
for continuous operation
Q
BEP
= Flow in best efficiency point
5.4
Stopping
1.
Close the discharge on-off valve: If the discharge line is equipped with a check or non-
return valve, the on-off valve can stay open.
2.
Stop the unit.
3.
Check that the motor stops and that it does not turn in the opposite direction.
4.
Gradually re-open the valve and check that the motor remains still.
5.
If installed, stop the auxiliary systems of the mechanical seal.
2 on the condition that NPSH
Application > (NPSH
Pump + 0.5 m)
