Pulsafeeder PulsaPro 900 EN - Manual (Page 53)

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10. Troubleshooting Chart
Difficulty Probable Cause Remedy
Pump does not
start 1. Coupling disconnected
2. Faulty power source
3. Blown fuse, circuit breaker
4. Broken wire
5. Wired improperly
6. Closed line valves Connect coupling
Check power source
Replace - eliminate overload
Locate and repair
Check wiring diagram
Open valves
No delivery 1. Motor not running
2. Supply tank empty
3. Lines clogged
4. Closed line valves
5. Check valves held open with
solids
6. Vapor lock, cavitation
7. Prime lost
8. Strainer clogged
9. Hydraulic system under-primed
Check power source. Check wiring diagram.
Fill tank
Clean and flush
Open valves
Clean - inspect
Increase suction pressure
Re-prime, check for leak
Remove and clean. Replace screen if necessary
Refer to Re-priming the Pump
Low delivery 1. Motor speed too low
2. Check valves worn or dirty
3. Hydraulic bypass valve operating
each stroke
4. Calibration system error
5. Product viscosity too high
6. Product cavitating
7. Piston seal worn or damaged by
contamination
8. Air entrained in Oil (foaming
from PTP diagnostic tube)
Check voltages, frequency, wiring, and Terminal
connections. Check nameplate vs. Specifications.
Clean, replace if damaged
Refer to Hydraulic Bypass Valve
Evaluate and correct
Lower viscosity by increasing product temperature.
Increase pump and/or piping size
Increase suction pressure. Reduce product temperature
Inspect and replace if necessary, refer to Piston Seal.
Refer to Re-priming the Pump
Delivery gradually
drops 1. Check valve leakage
2. Leak in suction line
3. Strainer fouled
4. Product change
5. Bypass leakage
6. Piston seal worn or damaged by
contamination
7. Supply tank vent plugged
8. Air entrained in Oil (foaming
from PTP diagnostic tube)
Clean, replace if damaged
Locate and correct
Clean or replace screen
Check viscosity
Correct for bypass valve leakage
Inspect and replace if necessary refer to Piston Seal
Unplug vent
Refer to Re-priming the Pump
Delivery erratic 1. Leak in suction line
2. Product cavitating
3. Entrained air or gas in product
4. Motor speed erratic
5. Fouled check valves
6. Air entrained in Oil (foaming
from PTP diagnostic tube)
Locate and correct
Increase suction pressure
Consult factory for suggested venting
Check voltage and frequency
Clean, replace if necessary
Refer to Re-priming the Pump
Delivery higher
than rated 1. Suction pressure higher than
discharge pressure
2. Discharge piping too small
3. Back pressure valve set too low
4. Back pressure valve leaks
Install back pressure valve or consult factory for piping
recommendations
Increase pipe size - install pulsation dampener in
discharge line
Increase setting
Repair, clean, or replace