Cheonsei KEMPION PDS Series, Instruction Manual, Page: 15 / 20

15
Problem Cause Action
Pump does
not work
The circuit breaker opens or the fuse is burnt Look into the cause and take action
Cables are broken Connect or replace
Wrong wiring Check the wiring diagram
Low voltage Investigate and take action
Poor insulation Replace
The bearing becomes damaged Check and replace
The reduction gear gets damaged Check and replace
Pump work,
but does
not discharge
fluid
The supply tank is empty. Refill fluid
Cavitation occurs in the fluid Check the NPSH and take action
Air gets in at the suction-side pipe Inspect and repair piping
The suction pipe gets clogged Wash piping and check the condition of the fluid
The ball seat gets blocked by foreign matter Wash & check and then install the strainer
The safety valve leaks Re-adjust the preset pressure. Inspect and repair
Pump produces
insufficient
amount of
discharge
The motor rotates very slowly Check the wiring for voltage and frequency
The amount of discharge was not calibrated
correctly
Check the measurement method and measuring
instruments
Insufficient suction pressure
Increase the water level of the supply tank and
enlarge the pipe’s diameter
Insufficient discharge pressure Install a back pressure valve
The suction pipe gets clogged
Clean the piping and check if the fluid flows
properly
Air comes into the suction pipe Inspect and repair the piping
The ball seat and/or check ball become dirty
or damaged
Clean or replace
The piping or pump leaks at joints Inspect and repair
The O-ring of the valve gets damaged or
defective
Replace
The constant velocity cam gets worn Replace
The diaphragm becomes obsolescent or
damaged
Replace
Cavitation occurs in the fluid Examine the NPSH and take action
Lubicant leaks
The oil seal gets damaged Replace
The lubricant gets contaminated Check for causes and replace
Fluid leaks a lot
The pressure gauge has broken down Replace
The diaphragm gets damaged Replace
The valve’s O-ring gets impaired and in poor
condition
Replace
There is much
noise and
excessive
heat
The atmospheric temperature is high Improve the installation condition
The suction pipe is clogged Wash the pipes
The bearing is damaged Check and replace
The reduction gear is damaged Check and replace
Cavitation occurs in the fluid Examine the NPSH and take action
Lubricant is insufficient or overflowing Drain or refill the lubricant to the specified level
The constant velocity cam gets worn Check and replace
The lubricant used is of different specification Replace it with a specified lubricant
The motor gets overloaded Inspect and adjust the discharge pipe system
The power supplied is improper Check and repair
The drive does not work smoothly
Check if it has any driving parts worn out or
corroded.
Notes 1. Conduct inspections regularly to keep the pulse rate stable.
2. Refer to the User Manual for any problems relating to the BLDC M/C unit, and contact us if you want
to have more information.
12
Cause & Action of Problem