Xylem Lowara Q-smart - Maintenance and Troubleshooting Guide; Troubleshooting Common Faults and Remedies

en - Original instructions
56
WARNING:
• Observe the accident prevention
regulations in force.
• Use suitable equipment and pro-
tective devices.
• Always refer to the local regula-
tions, legislation and codes in force
regarding the selection of the in-
stallation site, plumbing and power
connection.
11.1
General maintenance
Electrical hazard
Before any servicing or maintenance,
disconnect the system from the power
supply and wait at least 2 minutes be-
fore starting work on or in the unit.
Turn off and unplug the system before
installing the unit or carrying out
maintenance.
• The Q-SMART control panel does not require
any routine maintenance when used within
the limits that are indicated in the
• Technical data.
• It is advisable to periodically check correct
triggering of the high sensitivity differential
switch (30 mA) [RCD, residual current device]
suited to the ground fault current.
12 Troubleshooting
Introduction
In addition to the alarm troubleshooting guide in
the List of alarms (sections
7 and 9), we also pro-
vide a guide for troubleshooting other possible
problems.
12.1
Faults, causes, and remedies
The pump does not run, the main switch is on.
Cause
Solution
No power
supply
Restore the power supply and
check that the mains connec-
tion is intact.
Triggered
overload
Circuit breaker
Reset the overload circuit
breaker.
Triggered
ground fault
protective
device.
Reset the differential protec-
tion.
Fuse F1 or F2
is faulty.
Replace the fuse.
The motor
capacitor is
faulty.
Replace the capacitor if it is an
external one. Contact the local
sales and service representa-
tive if it is an internal capaci-
tor.
The pump starts up but blows the converter
fuse
Cause
Solution
Damaged power
cable, short cir-
cu
ited motor, or
the thermal protec-
tor or fuses are not
suited to the motor
current.
Check and replace the
components as neces-
sary.
Triggered thermal
overload switches
on single-phase
motors due to ex-
cessive current
input.
Check the operating con-
ditions of the pump.
The utilities are closed and the electric pump
runs at intermittent speeds
Cause
Solution
Water leaking out
of the non-return
valve or out of the
system.
Check the system to lo-
cate the leaks.
Repair or replace the
components.
Diaphragm tank
with broken dia-
phragm, when
applicable.
Replace the diaphragm.
Operating point is
not calibrated cor-
rectly in relation to
the system. For
example, the value
is higher than the
pressure supplied
by the pump.
Recalibrate the threshold
and timing.
There could be a
problem with the
level float in the
intake tank.
Check the float and the
tank.
There could be a
problem with the
level float in the
intake tank.
Check the pressure
switch and the intake
conditions (pressure).
The pump runs and there are vibrations in or
near the pump.
Cause
Solution
The operating
point is not cali-
brated correctly in
relation to the sys-
tem.
The value is below
the minimum pres-
sure that is sup-
plied by the pump.
Recalibrate the threshold
and timing.
The pump always runs at maximum speed.
Cause
Solution