Grundfos SMART Digital XL DDA 120-7, Installation And Operating Instructions Manual

Page: 49 / 54

English (GB)
49
* Depending on setting
Disch. valve leak
(Alarm)
• Leaky/dirty outlet valve. Dosing
medium flows back from the outlet
line into the dosing head and
moves the motor.
• Inlet pressure too high. Dosing
medium flows from the inlet line
into the dosing head and moves
the motor.
• Replace valve if necessary. See section
8.4 Perform service .
• Install screen in inlet line.
• Reduce inlet pressure. Observe section
4.1 Technical data .
Cavitation
(Alarm)
• Blocked / constricted / squeezed
inlet line
• Blocked/constricted inlet valve
• Suction lift too high
• Viscosity too high
• Cavitation moves the motor
• Enable "
SlowMode
". See section
7.6
SlowMode
.
• Reduce suction lift.
• Increase inlet line diameter.
• Check inlet line and open isolating valve if
necessary.
Overheating
(Alarm)
• Motor is overheated • Reduce ambient temperature.
• Stop pump until motor cools down.
Service now
(Warning)
• Time interval for service expired • Perform service. See section 8.4 Perform
service .
Display in the
"
Alarm
" menu
Possible cause Possible remedy