The Electric Pump Starts, But The Thermal Protector Trips Or The Fuses Blow A Short Time After; The Electric Pump Starts, But The Thermal Protector Trips A Varying Time After; The Electric Pump Starts, But The System's General Protection Is Activated; The Electric Pump Starts, But The System's Residual Current Device (Rcd) Is Activated - Xylem e-MPA Instruction Manual

Cause
The motor overloads.
7.4 The electric pump starts, but the thermal protector trips or the
fuses blow a short time after
Cause
The electrical panel is situated in an excessively heated area or
is exposed to direct sunlight.
The power supply voltage is not within the working limits of
the motor.
A power phase is missing.
7.5 The electric pump starts, but the thermal protector trips a
varying time after
Cause
There are foreign objects (solids or fibrous
substances) inside the pump which have jammed the
impeller.
The pumps delivery rate is higher than the limits
specified on the data plate.
The pump is overloaded because it is pumping liquid
that is too dense and viscous.
The motor bearings are worn.
7.6 The electric pump starts, but the system's general protection is
activated
Cause
A short circuit in the electrical system.
7.7 The electric pump starts, but the system's residual current
device (RCD) is activated
Cause
There is an ground (earth) leakage.

7.8 The pump runs but delivers too little or no liquid

Cause
There is air inside the pump or the piping.
e-MPA, e-MPR, e-MPD Horizontal Multistage Pump INSTRUCTION MANUAL
Remedy
Check the operating conditions of the pump and reset the
protection.
Remedy
Protect the electrical panel from heat source and
direct sunlight.
Check the operating conditions of the motor.
Check the
• power supply
• electrical connection
Remedy
Contact the local sales and service representative.
Partially close the ON-OFF valve down stream until the
delivery rate is equal or less than the limits specified on the
data plate.
Check the actual power requirements based on the
characteristics of the pumped liquid and replace the motor
accordingly.
Contact the local sales and service representative.
Remedy
Check the electrical system.
Remedy
Check the insulation of the electrical system components.
Remedy
• Bleed the air
7 Troubleshooting
33