Pulsafeeder Isochem RGT IOM - Manual (Page 29)

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7. Troubleshooting Guide
Symptom Probable Cause Remedy
Pump not primed. Prime pump.
Motor Incorrectly wired. Check wiring diagram.
Air leak in suction. Locate and repair.
Rotation direction incorrect. Reverse rotation.
Suction and/or discharge
valves closed. Open valves.
Suction lift too high. Do not exceed vapor pressure of liquid.
No Liquid Delivered
Magnetic coupling decoupled. Stop motor, eliminate blockage or jamming and restart. If no
blockage exists verify that operating conditions do not exceed
capabilities of the pump. If de-coupling persists upon startup,
a “soft-start” motor starter may be required to accommodate a
fast-starting or oversized motor.
Discharge head higher than
calculated. Reduce discharge restrictions eg: Open throttle valve.
Air leak in suction. Repair leak.
Rotational speed incorrect. Check speed and wiring.
Rotation direction incorrect. Reverse rotation.
Suction lift too high. Increase suction pressure.
Impeller or housing worn. Inspect and repair as required.
Low Liquid Delivery
Wear plates worn. Inspect and repair as required.
Rotational speed incorrect. Check Speed.
Air leak in suction. Repair leak.
Air or gas in liquid. Eliminate air or gas.
Impeller or Housing worn. Inspect and repair as required.
Low Discharge
Pressure
Wear plates worn. Inspect and repair as required.
Air pocket in suction line. Eliminate pocket. Pump Gradually
Loses Prime
Air entering suction line. Keep suction inlet submerged at all times.
Pump worn or damaged. Inspect and repair as required. Pump Noisy
Air or gas in liquid. Eliminate air or gas.
It is normal for motors to feel
hot even when not overloaded. Check the actual temperature of the motor housing with
suitable instrumentation. Verify the figures with the motor
manufacturer.
Motor wired incorrectly. Check wiring diagram.
Voltage or frequency low. Correct condition.
Motor not sized correctly for
the flow. Higher pressures may require more power than the motor is
capable of.
Heavy or viscous liquid being
pumped. Pumping fluids heavier or more viscous than water requires a
larger motor.
Motor runs hot or
Overloads
Binding internal pump parts. Inspect and correct condition.