Pulsafeeder Pulsa GLM DM1-6 - Manual (Page 21)

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6. Troubleshooting
Difficulty Probable Cause Remedy
Pump motor does
not start Faulty power source. Check power source.
Blown fuse, circuit breaker. Replace - eliminate overload.
Broken wire. Locate and repair.
Wired improperly. Check diagram.
Process piping blockage. Open valves, clear other obstructions.
Test by setting stroke to 0%.
No fluid delivery Motor not running. Check power source. Check wiring
diagram (see above).
Supply tank empty. Fill tank.
Line clogged. Clean and flush.
Closed in-line valve(s). Open valve(s).
Ball check valves held open with
solids. Clean – inspect, flush with clear fluid.
Vapor lock, cavitation. Increase suction pressure.
Prime lost. Re-prime, check for leak.
Strainer clogged. Remove and clean. Replace screen if
necessary.
Stroke adjustment set at zero. Increase stroke length setting.
Low fluid delivery Motor speed too low. Check voltages, frequency, wiring,
and terminal connections. Check
nameplate vs. Specifications.
Check valves worn or dirty. Clean, replace if damaged.
Calibration system error. Evaluate and correct.
Product viscosity too high. Lower viscosity by increasing product
temperature or dilution. Increase
pump and/or piping size.
Product cavitating. Increase suction pressure.
Delivery gradually
drops. Check valve leakage. Clean, replace if damaged.
Leak in suction line. Locate and correct.
Strainer fouled. Clean or replace screen.
Product change. Check viscosity and other variables.
Supply tank vent plugged. Unplug vent.
Delivery erratic. Leak in suction line. Locate and correct.
Product cavitating. Increase suction pressure.
Entrained air or gas in product. Consult factory for suggested venting.
Motor speed erratic. Check voltage and frequency.
Fouled check valves. Clean, replace if necessary.
Inadequate backpressure Increase discharge pressure to obtain
a minimum pressure difference of 5
psi from suction to discharge.
Delivery higher than
rated. Suction pressure higher than
discharge pressure. Install backpressure valve or consult
factory for piping recommendations.
Back pressure valve set too low. Increase setting.
Back pressure valve leaks. Repair, clean, or replace.
Noisy gearing,
knocking Discharge pressure too high. Reduce pressure.
Water hammer. Install pulsation dampener.
Stroke length at partial setting. Some operating noise is characteristic
of lost motion pumps.
Low grease level. Add or replace grease.