Thrush Pressurizer-VS PB-VSI Series - Manual (Page 13)

4.3 Initial Startup Procedure (Continued)
Read and fully understand Safety Information/Warnings in Section 2 before
continuing
1. Never work on the VFD, wiring, motor or other component when electrical power
is energized. Disconnect the power and verify that power to the Pressurizer-VS is
off.
2. Assure that the suction and discharge isolation valves are closed.
3. Verify that the tank pre-charge pressure is set per Figure 4-4. Make pressure
adjustments to the tank pre-charge if necessary using the air charging valve stem
on the tank.
4. Slowly open the suction isolation valve to fill the Pressurizer-VS and check for any
leaks. Repair any leaks before proceeding. If the suction pressure gauge
indicates suction pressure equal to or above suction pressure per Figure 4-4 you
may continue to step 5. If the suction pressure gauge indicates the suction
pressure is below that shown in Figure 4-4, you do not have adequate incoming
pressure. You must correct this before continuing to step 5, see Section 4.1
paragraph 4.
5. Slowly open the discharge isolation valve and check for any leaks in the discharge
piping.
6. Turn on the electrical power; the VFD controller will be illuminated when power is
energized.
7. Introduce 6 to 10 GPM of flow into the system by opening 3 or 4 plumbing fixtures
such as faucets. A typical faucet delivers approximately 2.5 GPM.
8. To initiate operation of the VFD, press “Start” (ABB) or “Auto” (Yaskawa) on the
VFD controller. The VFD should bring the pump up to speed to the factory
discharge set pressure as shown in Figure 4-4. See step 9 if adjustment is
necessary, if adjustment is not necessary go to Step 10.
9. To adjust the discharge set pressure, press the Up or Down arrow (Figure 4-3-1
or 4-3-2) on the VFD controller until desired discharge set pressure is achieved.
This is labeled “Drive Set Point” on the VFD controller. See Figure 4-4 for
capabilities of each Pressurizer-VS.
10. To verify the low suction pressure switch is working properly, cease the operation
of the VFD by pressing “Stop” (ABB) or “Off” (Yaskawa) on the VFD controller.
Close the suction isolation valve. The VFD controller will display an error when
pressure drops below the suction pressure in Figure 4-4. Open the suction
isolation valve and press “Start” (ABB) or “Auto” (Yaskawa) on the VFD controller
to resume normal operation.
Thrush Co.
Manual #9636-1400
9