B&D Mfg Smart - Manual (Page 17)

17
ALL THE PUMP YOU NEED AND MORE
Revised 7-5-12
Troubleshooting- Stop Function
The “STOP Function” for the Yaskawa V1000 Drive is Based on Two Conditions –
1. When all solenoid valves are closed and the pump is in a ‘no flow’ condition, the pump must be able to
maintain system pressure as set in parameter B5-19 (Constant Pressure Setting).
2. The drive setting for the “STOP Function” B5-15 should be 1-3 Hz below the operating Hz for the
lowest capacity (GPM) heat pump in the system. Refer to page 14 for “Adjusting the Sleep Function”.
Addition of a Bladder Tank to the System –
1. If the piping between the pump and the solenoid valves isn’t a significant distance (less than fifteen
feet), a bladder tank may be need to enable the stop function.
NOTE: Attempt the “STOP Function” before adding a bladder tank. A 2.2 gallon bladder tank
set to a pre-charge of 70% of the system pressure in parameter B5-19.
Example: B5-19 = 20 psi, then the pre-charge pressure of the bladder should be at 14 psi.
Static Pressure Test –
This test will determine if the system is able to maintain pressure. The system must be able to hold pressure
to enable the stop function. Follow the steps below to determine if you have any bypass of fluid in the system
past the solenoid valves or the check valve prior to the pump.
1. Go into the Set Up Menu “STUP” and change B1-02 from “1” to “0”. This will enable you to start/stop
the drive via the “Run/Stop” button on the face of the drive (Refer to menu navigation on page 10).
2. Press the “RUN” button on the drive and visually look at the gauge to determine the pressure setting
and make note of this pressure.
3. Allow all solenoid valves to close in the system.
4. Immediately hit the “Off” button on the drive and wait three to five minutes.
5. Determine if the pressure gauge is able to hold the original pressure. (The pressure is trapped
between the check valve before the pump and the solenoid valves.)
6. If the gauge doesn’t hold pressure, you have fluid bypassing the valves in the system.
7. Hit the run button on the drive until it reaches the set pressure.
8. If ball valves are placed in the system before the solenoid valves, then close all but one to see if the
system is losing pressure because the exposed solenoid valve is bypassing fluid.
9. If this isn’t the case, open the next ball valve to see if the additional solenoid valve is losing pressure.
Continue this process until all solenoid valves are exposed to the pressure created by the pump.
10. If there is a solenoid valve that is allowing the fluid to bypass (pressure loss due to not fully seating),
then the valve must be cleaned and checked for proper operation.
If the system is still having problems or loss of static pressure, please contact your local distributor for help. If
the VFD is cycling on and off continuously, this could result in motor failure.