ENGLISH
17
• Screws
Replace any damaged screws only with equivalent screws ISO 4762/DIN 912.
Material
Property class
UNI EN ISO 3506-1
Minimum tensile strength
[MPa]
Minimum yield stress
[MPa]
A2-70 700 450
• Capacitor change (Fig. 9)
• Impeller cleaning (Fig. 10)
• Mechanical Seal replacement (Fig.11)
• Float replacement (Fig.13)
• Cutter change (for GRINDER FX Fig.14)
8.2 Special maintenance
Special maintenance operations must be carried out exclusively by an assistance workshop authorised by DAB Pumps.
For explosion-proof pumps, flameproof joints are not intended to be repaired.
8.3 Contaminated pumps
If a pump has been used for a liquid which is injurious to health or toxic, the pump will be classified as contaminated.
If you are asking to have a pump repaired, you must contact the service centre to give them the details about the pumped liquid, etc.,
before sending the pump for repair. Otherwise, the service centre may refuse to accept the pump.
However, any application for service (no matter to whom it may be made) must include details about the pumped liquid if the pump has
been used for liquids which are injurious to health or toxic.
Before a pump is returned, it must be cleaned in the best possible way before it is returned.
9. TROUBLESHOOTING
Before attempting to diagnose any fault, make sure that the fuses have been removed or the mains switch has been
switched off. It must be ensured that the power supply cannot be accidentally switched on. All rotating parts must
All regulations applying to pumps installed in potentially explosive environments must be observed. It must be
ensured that no work is carried out in potentially explosive atmosphere.
When performing checks or inspections refer to the safety regulations stated in this manual or the attachment.
Failure in electric pump.
1. Check the motor input voltage value (see
“Technical characteristics”).
2. Check the power line, the power wiring, the
connections and the fuses.
3. Thermal overload switch has tripped.
a) single-phase motor
a) Wait until cooling has occurred
b) Reset the thermal overload switch and check
it is calibrated properly.
4. The thermal switch on the panel or automatic
residual current device on the main electrical
panel have tripped.
4. Check the insulation on the electric pump
wires, the electric pump itself or the floats. Reset
the thermal switch inside the panel or the residual
current device on the main electrical control
panel.
5. Automatic float switch jammed.
5. Clean, inspect and make sure it is working
properly
6. Level sensors or floats fail to enable start.
6. Wait for level to be restored, inspect the
sensors, floats and relative equipment and make
sure they are all working properly.
7. Where possible try to bypass the control panel
by connecting the pumps directly to the power
supply. If necessary contact the DAB Assistance
8. Remove obstruction, wash and clean: if
necessary contact the DAB Assistance Service.
9. Electric pump not working.
9. Contact the DAB Assistance Service.
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