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Troubleshooting
10 311594Z
Troubleshooting
1. Relieve the pressure.
2. Check all possible problems and solutions before
disassembling pump.
PROBLEM CAUSE SOLUTION
Pump does not operate. Insufficient power supply. Verify that power supply meets require-
ments. See Technical Data, page 50.
No flow rate input to VFD. Select speed/flow setting.
START/STOP switch set to STOP. Set START/STOP switch to START.
SECURE DISABLE switch not activated. Pull out to activate.
Outlet valve not open. Open valve.
Damaged electric motor. Repair, page 20.
Damaged gear reducer. Disconnect pumps and operate. If speed
is consistent, gear reducer is good. If
speed is erratic, gear reducer is bad.
Fluid dried on piston rod. Disassemble and clean lower. See lower
manual. In future, stop lower at bottom of
stroke.
Throat packing nut is too tight. Loosen packing nut and retighten.
3-phase wiring to motor is not correct. Inspect and confirm wiring continuity.
Pressure too low. Incorrect transducer calibration. Check calibration. Replace transducer if
necessary.
Lowers need repair. Check and repair. See lower manual.
Restricted pump fluid inlet. Clear.
Air in the fluid. Check fluid level. Check inlet fittings for
leaks.
Pump output low on both strokes. Insufficient power supply. Verify that power supply meets require-
ments. See Technical Data, page 50.
Exhausted fluid supply. Refill and reprime pump.
Held open or worn ball check valves. Check and repair.
Wrong fluid lowers installed. Verify size of lowers installed and config-
ured.
Pump output low on only one stroke. Held open or worn ball check valves. Check and repair.
Worn piston packings. Replace. See lower manual.
Air in the fluid. Check fluid level. Check inlet fittings for
leaks.
Erratic flow or pressure. Pump cavitation; suction/supply line leak. Check and repair.
Exhausted fluid supply. Refill and reprime pump.
Restricted fluid supply to pump. Ensure all valves are fully open.
Held open or worn ball check valves. Check and repair.
Pump packings are too tight. Loosen and retighten.
Worn piston packing. Replace. See lower manual.
Air in the fluid. Check fluid level. Check inlet fittings for
leaks.
Motor rotation direction is backwards. Check direction of rotation.
3-phase wiring to motor is not correct. Inspect and confirm wiring continuity.