Xylem e-MPA, Instruction Manual

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7 Troubleshooting
7.1 Troubleshooting for users
The main switch is on, but the electric pump does not start.
Cause Remedy
The thermal protector incorporated in the pump (if
any) has tripped.
Wait until the pump has cooled down. The thermal protector
will automatically reset.
The protective device against dry running has
tripped.
Check the liquid level in the tank, or the mains pressure.
The electric pump starts, but the thermal protection trips a varying time after.
Cause Remedy
There are foreign objects (solids or fibrous substances)
inside the pump which have jammed the impeller.
Contact the Sales and Service Department.
The pump is overloaded because it is pumping liquid that
is too dense and viscous.
Check the actual power requirements based on the
characteristics of the pumped liquid and then contact
the Sales and Service Department.
The pump runs but delivers too little or no liquid.
Cause Remedy
The pump is clogged. Contact the Sales and Service Department.
The troubleshooting instructions in the tables below are for installers only.
7.2 The main switch is on, but the electric pump does not start
Cause Remedy
There is no power supply. • Restore the power supply.
• Make sure all electrical connections to the power supply
are intact.
The thermal protector incorporated in the pump (if
any) has tripped.
Wait until the pump has cooled down. The thermal protector
will automatically reset.
The thermal relay or motor protector in the electric
control panel has tripped.
Reset the thermal protection.
The protective device against dry running has
tripped.
Check the:
• liquid level in the tank, or the mains pressure.
• protective device and its connecting cables.
The fuses for the pump or auxiliary circuits are blown. Replace the fuses.
7.3 The electric pump starts, but the thermal protector trips or the
fuses blow immediately after
Cause Remedy
The power supply cable is damaged. Check the cable and replace as necessary.
The thermal protection or fuses are not suited for the
motor current.
Check the components and replace as necessary.
The electric motor is short circuit. Check the components and replace as necessary.
7 Troubleshooting
32 e-MPA, e-MPR, e-MPD Horizontal Multistage Pump INSTRUCTION MANUAL