ENGLISH
18
−
Once the hydraulic circuit has been completely filled with liquid, gradually open the delivery gate valve until its maximum opening.
−
With the pump running, check the supply voltage at the motor terminals, which must not differ from the rated value by +/- 5%
(Fig. G)
.
−
With the unit at regular running speed, check that the current absorbed by the motor does not exceed the value on the data plate.
10. STOPPING
Close the interception device on the delivery pipe. If there is a check device on the delivery pipe, the interception valve on the delivery side may
remain open as long as there is back.
For a long period of inactivity, close the interception device on the intake pipe and, if supplied, all the auxiliary control connections.
11. PRECAUTIONS
The electropump should not be started an excessive number of times in one hour. The maximum admissible value is as
follows:
TYPE OF PUMP
MAXIMUM NUMBER OF STARTS PER HOUR
THREE-PHASE MOTORS UP TO 5.5 HP
30
THREE-PHASE MOTORS FROM 7.5 TO 60 HP
5 ÷ 10
11.1 DANGER OF FROST: Fig. H
This operation is advisable even in the event of prolonged inactivity at normal temperature
.
Check that the leakage of liquid does not damage persons or things, especially in plants that use hot water.
Do not close the drainage cap until the pump is to be used again.
When restarting after long periods of inactivity it is necessary to repeat the operations described above in the paragraphs
"WARNINGS"
and
"STARTING UP"
.
12. MAINTENANCE AND CLEANING
If possible, keep to a maintenance schedule: expensive repairs or machine down times can be avoided with a minimum expense.
During maintenance schedule discharge the condensate, if necessary present into the motor, through the hole, removing the exhaust
port plug (electropumps with IP55 Degree of motor protection only).
If the liquid has to be drained out maintenance, ensure that the liquid coming out cannot harm persons or things, especially
in using hot water.
The legal requirements on the disposal of any harmful fluids must also be complied with.
12.1
Periodic checks
In normal operation, the pump does not require any kind of maintenance. However, from time to time it is advisable to
check current absorption, the manometric head with the aperture closed and the maximum flow rate, which will enable
you to have advance warning of any faults or wear
.
13.
MODIFICATIONS AND SPARE PARTS
Any modification not authorized beforehand relieves the manufacturer of all responsibility.
14. TROUBLESHOOTING
FAULT
CHECK (possible cause)
REMEDY
1.
The motor does not
start and makes no
noise.
A.
Check the protection fuses.
B.
Check the electric connections.
C.
Check that the motor is live.
A.
If they are burnt-out, change them.
If the fault is repeated immediately this means
that the motor is short circuiting.
2.
The motor does not
start but makes noise.
A.
Ensure that the mains voltage corresponds to
the voltage on the data plate.
B.
Check that the connections have been made
correctly.
C.
Check that all the phases are present on the
terminal board.
D.
The shaft is blocked. Look for possible
obstructions in the pump or motor.
B.
Correct any errors.
C.
If not, restore the missing phase.
D.
Remove any obstructions.
3.
The motor turns with
difficulty.
A.
Check the supply voltage which may be
insufficient.
B.
Check whether any moving parts are scraping
against fixed parts.
C.
Check the state of the bearings.
B.
Eliminate the cause of the scraping.
C.
Change any worn bearings.
4.
The (external) motor
protection
trips
immediately
after
starting.
A.
Check that all the phases are present on the
terminal board.
B.
Look for possible open or dirty contacts in the
protection.
C.
Look for possible faulty insulation of the
motor, checking the phase resistance and
insulation to earth.
A.
If not, restore the missing phase.
B.
Change or clean the component concerned.
C.
Change the motor casing with the stator or
reset any cables discharging to earth.
