Nova-Tech LMI Series G - SD Metering Pump - Manual (Page 45)

SECTION 6
TROUBLESHOOTING
45
1. Pump motor won't operate.
2. Insufficient pump delivery.
SYMPTOMS POSSIBLE CAUSE REMEDY
a) Low process liquid level in the
tank.
b) Worn or dirty check valves.
c) Blocked discharge line.
d) Frozen liquid.
e) Blown fuse.
f) Open thermal overload device in
motor starter.
g) Broken wire.
h) Low voltage.
i) Pump not primed.
j) Capacity adjustment set at zero.
a) Incorrect capacity adjustment.
b) Incorrect pump speed.
c) Starved suction.
d) Leaky suction piping.
e) High suction lift.
f) Liquid near boiling.
g) Leaky safety valve in discharge
line.
h) High liquid viscosity.
i) Worn or dirty check valve seats.
a) Add liquid.
b) Clean or replace.
c) Clear line.
d) Thaw liquid throughout pumping
system.
e) Replace fuse.
f) Reset device.
g) Locate and repair.
h) Investigate and correct (wiring
may be too tight).
i) Allow suction line and pump
head to fill with liquid before
pumping against pressure.
j) Readjust capacity.
a) Readjust capacity setting.
b) Match line voltage and frequency
to pump motor data plate.
c) Increase piping size or suction
head.
d) Repair piping.
e) Rearrange equipment to de-
crease lift and/or install foot valve
in suction line.
f) Cool liquid or increase suction
head.
g) Repair or replace valve.
h) Reduce viscosity (e.g., heat or
dilute liquid), or consult the
factory for special check valve
options.
i) Clean or replace.
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