DAB ALM 200, Instruction For Installation And Maintenance

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ENGLISH
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13. 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.
E. Capacitor short-circuiting or broken.
B. Correct any errors.
C. If not, restore the missing phase.
D. Remove any obstructions.
E. Change the capacitor.
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 (on three-phase models).
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.
5. The motor
protection trips
too frequently.
A. Ensure that the environment temperature is
not too high.
B. Check the calibration of the protection.
C. Check the motor rotation speed.
D. Check the state of the bearings.
A. Provide suitable ventilation in the
environment where the pump is installed.
B. Calibrate at a current value suitable for the
motor absorption at full load.
C. Consult the motor data plate.
D. Change any worn bearings.
6. The pump
supplies
insufficient
flow.
A. The impeller is worn or blocked.
B. Check that the direction of rotation on three-
phase versions is correct.
A. Change the impeller or remove the
obstruction.
B. Invert the connection of two supply wires.
7. The pump
vibrates and
operates noisily.
A. Check that the pump and/or the pipes are
firmly anchored.
B. There is cavitation in the pump.
C. The pump is running above its plate
characteristics.
D. Ensure that the mains voltage corresponds
to the voltage on the data plate.
A. Fasten any loose parts.
B. Increase the system pressure, keeping within
the allowed limits.
C. Reduce the flow rate.
8. The absorbed
current is too
high.
A. Check that the fluid density or viscosity is
not too high.
B. Check whether any moving parts are
scraping against fixed parts.
C. The feeding voltage is not the same as the
voltage on the data plate.
D. The pump is running above its plate
characteristics.
A. Analyse the fluid to be pumped.
B. Eliminate the cause of the scraping.
C. Feed the motor with the correct voltage.
D. Reduce the flow rate.