Grundfos SMART Digital XL DDA 120-7, Инструкция по установке и эксплуатации

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English (GB)
47
9.1 List of faults
9.1.1 Faults with error message
Display in the
"
Alarm
" menu
Possible cause Possible remedy
Empty
(Alarm)
• Dosing medium tank empty • Fill tank.
• Check plug connection.
• Check contact setting (
NO
/
NC
). Low level
(Warning)
• Dosing medium tank almost empty
Overpressure
(Alarm)
• Outlet valve blocked • Replace valve if necessary. See section
8.4 Perform service .
• Isolating valve in outlet line closed • Check flow direction of valves (arrow) and
correct if necessary.
• Open the isolating valve (on the outlet
side).
• Backpressure exceeds max.
operating pressure
• Reduce backpressure. Observe section
4.1 Technical data .
• Pressure peaks due to high
viscosity
• Enlarge diameter of outlet line.
• Max. pressure is set too low. See
section 7.9
Pressure monitoring
.
• Change pressure setting. See section
7.9
Pressure monitoring
.
Low
backpressure
(Warning/alarm*)
• Faulty diaphragm • Change the diaphragm. See section
8.4 Perform service .
• Broken outlet line • Check outlet line and repair if necessary.
• Pressure differential between inlet
and outlet side too low
• Leakage in the pressure loading
valve at Q < 1 l/h
• Install additional spring-loaded valve
(approx. 2 bar) on the outlet side to
increase the pressure differential.
• Deaeration valve open • Close the deaeration valve.
Air bubble
(Warning)
• Broken/leaky inlet line • Check inlet line and repair if necessary.
• Provide positive inlet pressure (place
dosing medium tank above the pump).
• Strongly degassing medium • Enable "
SlowMode
". See section
7.6
SlowMode
.
• Tank dosing medium empty • Fill tank.
Cavitation
(Warning)
• Blocked / constricted / squeezed
inlet line
• Blocked/constricted inlet valve
• Suction lift too high
• Viscosity too high
• Enable "
SlowMode
". See section
7.6
SlowMode
.
• Reduce suction lift.
• Increase inlet line diameter.
• Check inlet line and open isolating valve if
necessary.
Suct. valve leak
(Warning)
• Leaky/dirty inlet valve. Dosing
medium flows back from the
dosing head into the inlet line
which reduces the target flow.
• Leakage in pressure valve or
pressure loading valve
• Check valve and tighten it up.
• Flush system.
• Replace valve if necessary. See section
8.4 Perform service .
• Check O-ring position.
• Install strainer in inlet line.
• Deaeration valve open • Close the deaeration valve.
Flow deviation
(Warning)
• Considerable deviation between
target and actual flow
• Check installation.
• Pump not or incorrectly calibrated • Calibrate the pump. See section
6.5 Calibrating the pump .