Fristam Pumps FPM 3531, Английский перевод оригинального немецкого руководства по эксплуатации, Страница: 21 / 25

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10.3 Troubleshooting table
Problem Possible cause Remedy
Pump either does not pump or pumps
irregularly. Suction line blocked or clogged. Open or clean suction line.
Suction filter contaminated. Clean suction filter.
Discharge-side shut-off valve closed. Open discharge line.
Viscosity of fluid too high Contact Fristam .
Impeller clogged. Reduce concentration of ingredients, increased
pressure, contact
Fristam
Pump not completely filled with liquid. Install pipe system so that pump casing is still
filled with liquid when pump is at a standstill.
Pump with geodesic suction head
1
; liquid level
falls at standstill.
Install foot valve in suction line.
Suction line leaky (drawing in air). Seal suction line.
Foot valve blocked or contaminated. Reestablish proper function of foot valve; clean.
Suction head too high. Lower pump; reduce suction head.
Air lock in suction line. Lay suction line at steady incline.
Excessive air or gas in pumping medium. Install vent valve
Cavitation at impeller inlet; resistance in suction
line too high; suction head too high. Optimize suction line; increase inlet height; lower
media temperature.
Separation of the magnetic field, magnetic cou-
pling slipping. Shutdown motor, remove cause of blocking,
restart.
Check motor startup.
Flow rate too high Discharge-side valve opened too wide. Throttle valve.
Discharge line diameter too large. Reduce nominal pipe size; insert orifice plate.
Impeller diameter too large. Trim impeller outside diameter. Reduce speed
with frequency converter. Contact
Fristam .
Flow rate too low; discharge head too low Selected pump too small. Contact Fristam .
Selected impeller diameter too small. Contact Fristam , replace impeller.
Direction of rotation of motor incorrect. Exchange connections in motor terminal box.
Speed too low (voltage incorrect). Correct connection according to motor rating
plate.
Nominal pipe sizes too small. Use larger pipe diameters.
Resistance in suction and/or pressure lines too
high. Optimize pipe system, reduce number of elbows
and valves, contact
Fristam
Pipe clogged or full of deposits. Clean pipes.
Foreign objects/deposits in impeller. Remove and clean impeller.
Impeller incorrectly adjusted. Check impeller clearance and re-adjust
Density of pumping liquid too high. Viscosity of
pumping liquid too high. Contact Fristam .
Separation of the magnetic field, magnetic cou-
pling slipping. Repair cause of the separation, restart motor, con-
tact
Fristam .
Metal noise Foreign object in pump interior. Disassemble, inspect, and repair.
Impeller catching. Readjust clearance; tighten impeller nut using
torque wrench.
Pump/magnetic coupling runs dry. Immediately add pumping medium, open suction
valve.
Damaged outside magnets. Shut down pump, check outside rotor and con-
taminant shell, contact
Fristam .
Loose screws. Check magnetic coupling, use appropriate torque
to tighten screws, replace component if neces-
sary.
Table 10 Troubleshooting table