Xylem 10 001 262R5 AquaForce Pump Controller - Manual (Page 49)

AQUAFORCE Installation, Operation, and Maintenance 43
6.13 Troubleshooting
VFD FAILURE
a. Remedy:
i. Cycle Power to VFD and Station.
ii. Check power wiring and fuses for affected VFD.
iii. Check all wiring between VFD and PLC.
iv. Check to be sure VFD is not in LOC mode.
HIGH SYSTEM (Discharge):
a. Remedy:
i. Check application for high discharge pressure conditions. Does the mechanical gauge on the
discharge header match the actual pressure displayed on the PLC?
ii. Check suction pressure conditions. Is suction pressure significantly higher than original system
design point?
iii. Check Ramp Speed settings. Fast ramp speeds can increase the chance of over-pressurizing the
system, especially with larger pumps.
LOW SYSTEM (Discharge):
a. Remedy:
i. Check application for low discharge pressure conditions. Does the mechanical gauge on the
discharge header match the actual pressure displayed on the PLC?
ii. Are the pumps running in the correct direction?
iii. Check suction pressure conditions. Is suction pressure significantly lower than original system
design point?
iv. Is the system drawing a vacuum? Can the water supply keep up with demand?
v. Could there be a broken pipe/leak in the system? In other words, does the system seem to be
running in a ‘open discharge’ condition?
vi. Check Ramp Speed settings. Slow ramp speeds can increase the chance of a rapid drop in
system pressure.
LOW SUCTION:
a. Remedy:
i. Check application for legitimate ‘low suction’ pressure fault. Is a PRV set incorrectly?
ii. Could the system be drawing a vacuum?
iii. Check that PLC is properly programmed for the correct number of switches/sensors.
iv. Check for open or closed switch contacts. Refer to wire diagrams for proper connection.
Maintenance