Troubleshooting - ProMinent DULCODOS DSWb SP10 Assembly And Operating Instructions Manual

7.2 Troubleshooting

Fault
Suction line contains gas
bubbles
Metering pump is not
pumping or indicates
decreased capacity
The table does not claim to be complete.
Further reasons for failure and detailed information on the causes of faults can be found in the operating instructions
for the individual components.
Possible cause
Priming lift too high, operating conditions
too close to the vapour pressure of the
medium
Suction line leaks and is drawing air
Medium tends to be gaseous
Suction line contains gas bubbles
Suction line is blocked
Suction pressure required is too high
Suction line contains gas bubbles
Flushing or drain open on the suction side
Shut-off valve on the evacuation tank not
closed
Tank and/or priming lift too high
Empty alert and/or low flow contact trig‐
gered
Ball jammed/stuck in the metering pump
suction or discharge valve
Ball dissolved in the suction or discharge
valve
Diaphragm tear / diaphragm rupture sensor
activated
Opening pressure of the relief valve / safety
valve too low
Open flushing and drainage connection on
the discharge side
Air in the discharge line
Metering line ruptured
Shut-off valve closed (discharge side)
Metering line blocked
Back pressure too high at the injection point Reduce back pressure or replace pump
Injection point blocked
Voltage drop or failure
Cable for power supply is not correctly con‐
nected
Maintenance and Troubleshooting
Remedy
Reduce priming lift, use automatic gas
release, reduce temperature
Check negative pressure tightness and
connections, bleed line
Automatic gas release at the highest point
and in the dosing head, always lay suc‐
tion lines at a continuous incline, avoid
higher temperatures and UV radiation,
flush suction connector
See separate fault indication
Remove blockage / dirt
Modify suction line, use a wider cross-
section and/or use a priming pulsation
damper
Bleed at the highest point, lay suction line
with a continuous incline
Close flushing or drain tap on the suction
side
Close fitting and, if required, re-evacuate
the suction line
Use priming aid
Top up chemicals into the storage tank:
make sure that the level sensor is
immersed in the medium
Dismantle, clean and, if required, replace
valve
Replace valve and check resistance
Replace diaphragm and sealing set
Correctly set the opening pressure
Close flushing and drainage connection
Bleed metering line at the highest points
Correctly repair the metering line
Open shut-off valve
Rectify blockage, check opening pressure
of the relief valve and/or safety valve
with a higher capacity
Clean injection point
Reconnect the power supply
Ensure correct power supply through
measurement
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