Viking Pump TSM344: CMD Mag Drive - Manual (Page 19)

SECTION TSM 344 ISSUE F PAGE 19 OF 24
Symptom Probable Cause Remedy
No Liquid
Delivered
Pump not primed.
Prime pump. Ensure suction piping and any strainers
are clean and clear of any obstructions.
Motor Incorrectly wired. Check wiring diagram.
Air leak in suction. Locate and repair leak.
Rotation direction incorrect. Reverse motor wiring.
Suction and/or discharge valves closed. Open valves.
Suction lift too high. Do not exceed published limits.
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.
Low Liquid
Delivery
Discharge head higher than calculated.
Reduce discharge restrictions e.g.: Open throttle valve
or back-pressure valve.
Air leak in suction. Locate and repair leak.
Rotational speed incorrect. Check speed and wiring. Adjust as required.
Suction pipe restrictions. Ensure suction valve is fully open and strainer is clean.
Pressure relief valve open. Reset PRV to proper setting based on system pressure.
Pump components worn. Inspect and repair as required.
Low Discharge
Pressure
Rotational speed incorrect. Check speed and adjust as required.
Air leak in suction. Repair leak.
Air or gas in liquid.
Eliminate air or gas that can be caused by obstructions
in suction piping, leak in suction pipe, or cavitation and/
or boiling of pumped fluid.
Pump components worn. Inspect and repair as required.
Pump Gradually
Loses Prime
Air pocket in suction line. Eliminate pocket.
Air entering suction line. Keep suction inlet submerged at all times.
Pump Noisy
Pump worn or damaged. Inspect and repair as required.
Air or gas in liquid. Eliminate air or gas.
Motor Runs hot
or Overloads
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 properly sized, higher powered motor.
Binding internal pump parts. Inspect and correct condition.
TROUBLEShOOTING ChART