Blanking Flanges; Lubricating The Bearings; Troubleshooting - DAB CP2-G Installations- Und Wartungsanleitungen

10.2 Blanking flanges

For twin-head pumps, a blanking flange with a pump housing gasket is
available. If one pump requires service, the blanking flange is fitted to allow
the other pump to continue operating.

10.3 Lubricating the bearings

Carry out maintenance based on the type of bearing
indicated on the technical data plate. See tables at the
end of the booklet.

11. TROUBLESHOOTING

Fault
The motor does not start
and makes no noise.
The pump supplies
insufficient flow.
The motor does not start
but makes noise.
The motor turns with
difficulty.
The (external) motor
protection trips immediately
after starting.
The motor protection trips
too frequently.
The pump vibrates and
operates noisily.
Check (possible cause)
Check the protection fuses.
−
Check the electric connections.
−
Check that the motor is live.
−
The impeller is worn or blocked.
−
Check that the direction of rotation on three-
−
phase versions is correct.
Ensure that the mains voltage corresponds to
−
the voltage on the data plate.
Check that the connections have been made
−
correctly.
Check that all the phases are present on the
−
terminal board.
The shaft is blocked. Look for possible
−
obstructions in the pump or motor.
Capacitor short-circuiting or broken.
−
Check the supply voltage which may be
−
insufficient.
Check whether any moving parts are
−
scraping against fixed parts.
Check the state of the bearings.
−
Check that all the phases are present on the
−
terminal board (on three-phase models).
Look for possible open or dirty contacts in the
−
protection.
Look for possible faulty insulation of the
−
motor, checking the phase resistance and insulation to
earth.
Ensure that the environment temperature is
−
not too high.
Check the calibration of the protection.
−
Check the motor rotation speed.
−
Check the state of the bearings.
−
Check that the pump and/or the pipes are
−
firmly anchored.
There is cavitation in the pump.
−
The pump is running above its plate
−
characteristics.
Ensure that the mains voltage corresponds to
−
the voltage on the data plate.
ENGLISH
Remedy
If they are burnt-out, change them.
If the fault is repeated immediately this means
that the motor is short circuiting.
Change the impeller or remove the obstruction.
Invert the connection of two supply wires.
Correct any errors.
If not, restore the missing phase.
Remove any obstructions.
Change the capacitor.
Eliminate the cause of the scraping.
Change any worn bearings.
If not, restore the missing phase.
Change or clean the component concerned.
Change the motor casing with the stator or reset
any cables discharging to earth.
Provide suitable ventilation in the environment
where the pump is installed.
Calibrate at a current value suitable for the motor
absorption at full load.
Consult the motor data plate.
Change any worn bearings.
Fasten any loose parts.
Increase the system pressure, keeping within the
allowed limits.
Reduce the flow rate.
16
Fig.4