Pulsafeeder Pulsa GLM DM7 - Manual (Page 26)

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10. Troubleshooting
DIFFICULTY PROBABLE CAUSE REMEDY
Pump does not start
Faulty power source Check power source
Blown fuse, circuit breaker overload Replace - eliminate
Broken wire Locate and repair
Wired improperly Check diagram
Process piping blockage Open valves, clear other obstructions
No delivery
Motor not running
Check power source. Check wiring
diagram (see above)
Supply tank empty Fill tank
Lines clogged Clean and flush
Closed line valves Open valves
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 lenth setting
Low 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 piiping 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