Xylem Z6 ZN6 - Manual (Page 21)

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21
Pump or auxiliary circuits protection fuses
blown Replace fuses
Triggering of protection device against dry
running
Check the water level in the tank or well.
If everything is in order, check the
protection device and its connection
cables
Power supply cable is damaged
Electric motor short circuit Check the components and replace as
necessary
The electric pump starts up but the
thermal protector is immediately triggered
or the fuses blow
Thermal protector or fuses not suited to
the motor current
Motor overload Check the operating conditions of the
electric pump and reset the protection
Wrong rotation direction Check the direction of rotation and, if
necessary, exchange two phases in the
electrical panel if the pump is a three-
phase model, or check all the connections
if it is a single-phase model
A phase in the power supply is missing Check the power supply The electric pump starts up but, after a
short period of time, the thermal
protector is triggered or the fuses blow. Power supply voltage not within the
motor’s working limits
Check the operating conditions of the
electric pump
The electric panel is situated in an
excessively heated area or is exposed to
direct sunlight Protect the panel from heat sources and
from the sun
There are foreign bodies (solid or fibrous
substances) inside the pump, the impellers
are jammed
Extract the electric pump and clean it The electric pump starts up but, after a
varying period of time, the thermal
protector is triggered.
The pump’s delivery rate is higher than
the limit specified on the rating plate Partially close the on-off valve located
downstream until the delivery rate returns
to within the specified limits
The temperature of the sucked liquid is
too high Check the operating conditions of the
electric pump.
Worn motor bearings Contact our Sales and Service Department
The electric pump starts up but does not
deliver the required flow Wrong rotation direction (three-phase
version) Check the direction of rotation and, if
necessary, exchange two phases in the
motor or electrical panel
Pump is not primed because not filled
with water Repeat the priming procedure
Pump not primed due to tightness failure
in check valve Check the check valve for perfect tightness
Air in the pipes or pump Bleed the air
Piping and/or pump clogged Disassemble and clean
Well water level has dropped too much Wait for water level to rise or, if possible,
lower the electric pump further
Pump capacity too high for well Replace the pump with a lower capacity
one
Worn pump Extract the pump and overhaul it
The system’s general protection cuts in. Short circuit Check the electrical system
The system’s differential thermal-magnetic
protection cuts in.
Ground leakage. Check insulation of the electrical system
components
The pump rotates in the wrong direction
when it is stopped. Leaks in check valve Repair or replace the components
The pump starts up too frequently Leaks in check valve or system Check and locate leaks. Repair or replace
the components
Ruptured membrane or no air pre-charge
in surge tank
See relevant instructions in surge tank’s
manual
The pump starts up too frequently Well water level has dropped too much Wait for water level to rise or, if possible,
lower the electric pump further
Pump capacity too high for well Replace the pump with a lower capacity
one
9. Disposal Information for installation and maintenance personnel
Observe the regulations and codes locally in force regarding sorted waste disposal.