Xylem AquaBoost CS and VS Pumping Packages - Manual (Page 42)

Cause Remedy
The impeller is bound. Check to see if you can turn the pump by hand. Check for
a bound impeller.
A pressure transducer is faulty. Replace faulty pressure transducers.
Motor wiring is loose. Make sure that motor wiring is securely connected.
Motor windings have lost insulation strength. Test the motor leads with a megger in order to check the
motor windings.
Variable speed drive is wired incorrectly. Check corresponding variable speed drive. Make sure
drive is wired correctly.
Motor is defective. Repair or replace motor.
Troubleshoot the pump operation
If the pump still does not operate after you have checked initial causes, then use this
procedure to further investigate and correct the problem.
1. Momentarily turn the HOA switch to the HAND position and then back to OFF. Does
the starter pull in?
• If the starter does not pull in, then go to the next step.
• If the starter does pull in, then go to the last step.
2. Turn the HOA switch to the HAND position. Check the voltage across the terminals for
the coil in the starter.
• If voltage is present and the starter is not pulled in, the coil is defective and must be
replaced.
• If no voltage is present, then go to the next step.
3. With the HOA still in the HAND position, check the voltage between the hot side of the
starter coil and the neutral (white) wire. 120 volts should be measured.
• If no voltage is measured, then check incoming power and fuses.
• If voltage is measured, then go to the next step.
4. With the HOA still in the HAND position, check the voltage between the hot side of the
coil and the neutral (white) wire for overload block. 120 volts should be measured.
• If voltage is measured, then replace the GV2P block.
• If no voltage is present, then contact your local Goulds Pumps representative to
service the control circuit.
5. With the starter pulled in, check the voltage at the bottom of the GV2P block. The
voltage should be the same as the incoming power.
• If no voltage is present, then replace the starter.
• If voltage is present, then contact an electrician to check the leads and motor.
For electrical troubleshooting of variable speed units, refer to the manuals of the
corresponding variable speed controllers.
The pumps run but do not build desired pressure
Cause Remedy
Pumps are running off their design curve. 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?
Pumps are running at less than full speed. 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.
The inlet pressure does not match the project
specifications.
Check to see if the inlet pressure matches the project
specifications. Variations in inlet pressure can have
detrimental effects on performance.
A pipe is broken. Check for broken pipes.
Troubleshooting
40 AquaBoost CS and VS Pumping Packages Installation, Operation, and Maintenance Manual