Troubleshooting - Lowara TKS Series Instructions For Installation And Use Manual

17.

Troubleshooting

In the event of malfunctions, before contacting our customer service centre, please check to see
whether the problem is among those described in the converter handbook. When requesting
technical information or spare parts, please specify the type of unit and the data shown on the
rating plate attached to the unit's electrical panel.
Carefully note down the number of flashes emitted by the alarm signalling devices before
disconnecting the power supply.
The maintenance operations on the unit or pumps may only be performed by qualified technicians
after the power supply has been disconnected.
Problem
The electric pump does not start
Main switch on
Green light off
The electric pump does not start or it
stops if it is already running
The main switch is on
Green light on
Red light on (*** flashes)
The pump's speed increases and
decreases without any stops, and with
no water consumption (users closed)
Green light on
Yellow light on
Red light off
Pump runs at maximum speed without
any stops
Only one pump is operating
Green light on
Yellow light off
Red light off
There is water demand but the pump
does not start (Users open)
Green light on
Yellow light off
Red light off
Triggering of general system
protection (fuses).
Triggering of differential protection
The unit does not generate the desired
pressure
14
Probable cause
No power supply
Triggering of thermal-magnetic switch
***= 2 flashes
Motor overload
***=3 flashes
Converter overtemperature
***= 4 flashes
Motor overtemperature ( PTC)
***= 5 flashes
Dry running protection
***= 6 flashes
Pressure transmitter
***=7 flashes
The supply voltage is too low
***=9 flashes
Overvoltage on DC BUS
Water leaks through the non-return
valve
Diaphragm tank undersized or
ruptured
Pressure set point not suitable for the
system (the value is higher than the
pressure that the pump is able to
deliver)
Pressure transmitter not connected
(cock closed) or damaged.
The pumps have different settings
Interrupted serial line cable
Pressure set point not suitable for the
system (the value is zero)
Short circuit
Ground leakage
The pumps rotate in the wrong
direction
On-off valves closed
Air in the suction pipe
Excessive suction lift and/or flow
resistance on suction side (e.g. foot
valve)
Excessive flow resistance in delivery
pipes and/or valves
Possible remedy
Restore the power supply
Reset the switch
Check the working conditions of the
pump
Check the motor
Check to see if anything is preventing
the proper cooling of the converter
Check the working conditions and
whether anything is preventing the
proper cooling of the motor
Check the water level and the external
protection devices (float switch...)
Check the pressure transmitter, its
cable and connector.
Check the power line and cables
Overvoltage generated by the electrical
power line. Non-return valve faulty and
fluid flows in the opposite direction.
Check the equipotential earth system.
Check the hydraulic system and the
non-return valves
Check the operating conditions
Replace the tank
Set the pressure
Check the hydraulic and electrical
connection of the pressure transmitter
Set the pumps
Check the connection cables
Set the pressure
Check the connection cables
Check the connection cables
Restore the correct connection to the
motor by exchanging two leads.
Open the valves
Eliminate the air and prime the pumps
Reduce the suction lift, increase the
diameter of the pipes, replace the foot
valve
Reduce water leaks