Xylem e-MPA, Instruction Manual

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Cause Remedy
The pump is not correctly primed. Stop the pump and repeat the prime procedure.
If the problem continues:
• Check that the mechanical seal is not leaking.
• Check the suction pipe for perfect tightness.
• Replace any valves that are leaking.
The throttling on the delivery side is too
extensive.
Open the valve.
Valves are locked in closed or partially closed
position.
Disassemble and clean the valves.
The pump is clogged. Contact the local sales and service representative.
The piping is clogged. Check and clean the pipes.
The rotation direction of the impeller is wrong.
(three-phase version) Change the position of two of the phases on the terminal board of
the motor or in the electric control panel.
The suction lift is too high or the flow
resistance in the suction pipes is too great.
Check the operating conditions of the pump. If necessary, do the
following:
• Decrease the suction lift
• Increase the diameter of the suction pipe.
7.9 The electric pump stops, and then rotates in the wrong direction
Cause Remedy
There is a leakage in one or both of the following components:
• The suction pipe
• The foot valve or the check valve
Repair or replace the faulty component.
There is air in the suction pipe. Bleed the air.
7.10 The pump starts up too frequently
Cause Remedy
There is a leakage in one or both of the following components:
• The suction pipe
• The foot valve or the check valve
Repair or replace the faulty component.
There is a ruptured membrane or no air pre-charge in the pressure tank. See the relevant instructions in the
pressure tank manual.
7.11 The pump vibrates and generates too much noise
Cause Remedy
Pump cavitation Reduce the required flow rate by partially closing the ON-OFF valve
downstream from the pump. If the problem persists check the operating
conditions of the pump (for example height difference, flow resistance, liquid
temperature).
The motor bearings are worn. Contact the local sales and service representative.
There are foreign objects inside the
pump.
Contact the local sales and service representative.
Impeller rubs on the wear ring Contact the local sales and service representative.
Coupling misaligned Check the coupling alignment.
Flexible elements of the coupling
worn
Check and replace the relevant parts if there is any sign of wear.
7 Troubleshooting
34 e-MPA, e-MPR, e-MPD Horizontal Multistage Pump INSTRUCTION MANUAL