Xylem LOWARA e-SV Series User Manual

en – Translation of the Original Instructions
e-SV series – Additional Installation, Operation and Maintenance Instructions 37
7.5 The thermal overload protection triggers
The motor thermal overload protection triggers occasionally, or after the unit has been
running for a few minutes.
Cause
Remedy
It is calibrated at a value too low in relation to the rated
current of the motor
Recalibrate
Input voltage outside the rated limits
Make sure the voltage values are correct
Unbalanced input voltage
Make sure the voltage of the three phases is balanced
Incorrect working curve (flow rate greater than the maximum
permitted flow rate)
Reduce the required flow rate
Liquid too dense, presence of solid or fibrous substances
(unit overloaded)
•
Reduce the density of the liquid and/or
• Remove the solid substances and/or
• Increase the size of the motor
Room temperature too high, exposure to sunlight
• Lower the temperature at the point of the thermal
overload protection and/or
• Protect against direct sunlight
Unit faulty
Send the unit to an authorised workshop for testing
7.6 The motor becomes excessively hot
Cause
Remedy
Room temperature outside the rated limits
Lower the room temperature
Cooling fan of the motor clogged or damaged
Clean or replace the cooling fan
The unit starts up too frequently
See the section: The unit produces excessive noise and/or
vibrations
The frequency converter, if present, has not been calibrated
properly
See the frequency converter manual
7.7 The unit runs but there is little or no flow rate
Cause
Remedy
Motor turns in the wrong direction
Check the direction of rotation and change it if necessary
Incorrect priming (there are air bubbles in the suction pipe or
in the unit)
Repeat the priming procedure
Cavitation
Increase the NPSH
2
available in the system
Check valve locked in closed or partially closed position
Replace the check valve
Foot check valve locked in closed or partially closed position
Replace the foot check valve
Discharge pipe throttled
Remove the throttling
Piping and/or unit clogged
Remove the clogging
7.8 When switched off, the unit turns in the opposite direction
Cause
Remedy
Check valve faulty
Replace the check valve
Foot check valve faulty
Replace the foot check valve
2
Net Positive Suction Head

Xylem LOWARA e-SV Series Specifications

General

Brand	Xylem
Model	LOWARA e-SV Series
Category	Water Pump
Language	English