10
TROuBLE ShOOTing:
Pump Set Operational
Problems
Probable Cause
Precautions and Solutions
Less Discharge
Less Voltage
Check all connections if
the voltage is found to be
consistently low, fit a booster
Incorrect direction of
rotation
Interchange the supply
connections of any two
phases
Low frequency
Re check the voltage and
frequency
The pump refuses to deliver
water
Power is not available
Check the line
Fuse is defective
Check line fuses
Low voltage supply resulting
in lesser speed
Install a booster to improve
voltage
Pump motor coupling is
damaged
Take out the pump set and
repair damaged couplings
Defective motor winding,
cable and starters
Check all parameters
Excessive consumption of
current
Voltage too low
Check voltage
Fuse is defective
Check line fuses
Defective rotor
Change the rotor
High frequency of supply
resulting in high motor
speed
Check the frequency
Winding insulation
inadequate
Change the winding
Loose connection in line
Check the connection input
supply
Pump runs roughly / is noisy
/ vibrates too much
Defective thrust bearing of
motor and wrong alignment
in coupling
Change defective parts and
couple the motor and pump
as per instruction
Low total head
Low supply voltage
Check the voltage
Pump does not operate
Absence of power supply or
low voltage
Check the power supply
Rotor has seized owing to
prolonged shutdown
Check the panel board and
fuser property
Defective fuse or panel board Check the panel board and
fuser property
Summary of Contents for MSI Series
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