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7 Troubleshooting
Cause
Automatic mode is faulty.
The impeller is bound.
A pressure transducer is faulty.
Motor wiring is loose.
Motor windings have lost insulation strength.
Variable speed drive is wired incorrectly.
Motor is defective.
7.1.3 The pumps run but do not build desired pressure
Cause
Pumps are running off their design curve.
Pumps are running at less than full speed.
The inlet pressure does not match the project
specifications.
A pipe is broken.
The transducer isolation valves are closed.
The NPSH is insufficient.
The pump station has lost its prime.
The pump rotation is incorrect.
A suction or discharge valve is closed or clogged.
The motor is not operating at the rated RPM.
The impeller is worn or plugged.
The pump bearings are worn.
7.1.4 The pump station experiences excessive vibration
Cause
The motor, pump, or piping is loose.
24
TECHNOForce e-HV Mechanical Installation, Operation, and Maintenance Manual
Remedy
Check to see if the pump can be run in Manual mode on
the Hydrovars.
Check to see if you can turn the pump by hand. Check for
a bound impeller.
Replace faulty pressure transducers.
Make sure that motor wiring is securely connected.
Test the motor leads with a megger in order to check the
motor windings.
Check corresponding variable speed drive. Make sure
drive is wired correctly.
Repair or replace motor.
Remedy
Check the application. Is the system running in an open
discharge condition (excessive flow rate)? For example, is
the system filling a large irrigation line for the first time
of the season?
Check to see if the pumps are running at full speed. If
they are running less than full speed, they could be
experiencing electrical issues. Check the panel for power
status.
Check to see if the inlet pressure matches the project
specifications. Variations in inlet pressure can have
detrimental effects on performance.
Check for broken pipes.
Check to be sure that the transducer isolation valves are
in the open position.
Check the NPSH. Are proper flooded conditions or
positive pressure being delivered to the pump station?
Check for air in the supply lines. Check for properly filled
supply tanks (if applicable). Excessive suction lift or
piping losses will limit the life expectancy of the pumps.
Check to be sure that the pump station has been primed
properly. Make sure that all pumps and components are
properly filled with water.
Check the pump rotation. Proper rotation is indicated on
the pump volute. (See the pump IOM.)
Check the isolation valves and check valves. Are all
suction/discharge valves open? Could any valves be
plugged? Could the pumps be plugged?
Check the voltage and amperage. Check for possible
phase loss to the motor.
Take the pump to an authorized pump repair facility.
Take the pump to an authorized pump repair facility.
Remedy
Make sure that all fasteners and components are properly
tightened.
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