Lowara Q-Smart Manuel D'installation, D'exploitation Et De Maintenance page 56

en - Original instructions

If the alarm appears but the pressure value
does not reach the value of the pressure switch
P MAX:
o
The maximum pressure switch must be
replaced.
o
The cable of the pressure switch is faulty
or worn, replace it.
o
Check connection of the pressure switch
P MAX to the Q-SMART control panel
terminal (see figures 6,
o
The pressure switch P MAX is damaged,
replace it.
N° Description
A37 Minimum pressure alarm
Troubleshooting:
The pressure value has reached the set value of the
minimum pressure switch P MIN.
All the pumps are stopped.
The alarm is excluded in manual mode.
Causes/solutions

The pressure has reached the set value of the
minimum pressure switch P MIN. Check the
pump performance curve and the proper set
point (r07) or thresholds of the pumps (r10, r12).

If the alarm appears but the pressure value has
not reached the set value of the pressure switch
P MIN:
o
The pressure switch P MIN is damaged
and must be replaced.
o
The cable of the pressure switch is faulty
or worn, replace it.
o
Check connection of the pressure switch
P MIN to the Q-SMART control panel ter-
minal (refer to figures 6,

The pump (impeller or diffuser) is damaged.
Contact the technical assistance service.

The motor doesn't run:
o
It is damaged and must be replaced. Con-
tact the technical assistance service.
o
The thermal protector inside the motor is
faulty or broken.
o
The capacitor is broken.
N° Description
A38 Minimum pressure out of op-
eration range.
Troubleshooting:
Tripping of the protection against operation of the
pump below the minimum pressure. The signal ar-
rives from the minimum pressure switch connected
to the digital input D IN PROG (c38=1). If it appears
during normal operation instead of during the auto-
test phase, all the pumps are enabled in order after
the set delay time (t38) to restore the pressure.
Causes/solutions

There is an alarm but the pumps are stopped:
56
7 and 9).
Reset
Auto
7 and 9).
Reset
Auto
o
The pressure switch is faulty or its cable is
damaged. Replace the pressure switch or
cable.
o
Incorrect setting of the pressure switch,
change it.

There is an alarm but the pumps are running:
o
The pressure switch is faulty or its cable is
damaged. Replace the pressure switch or
cable.
o
The pumps cease to perform: the impeller
is broken.
o
Wrong selection of pump: change the
pump.

The motor doesn't run:
o
It is damaged and must be replaced. Con-
tact the technical assistance service.
o
The thermal protector inside the motor is
faulty or broken.
o
The capacitor is broken.
N° Description
A39 External fault alarm
Configuration of the indication
of an external alarm connected
to digital input D IN PROG
(c38=2).
Troubleshooting:
The Alarm is detected by an external device. The
logic is configured by the parameter r38. All pumps
are stopped and they don't run until the alarm ap-
pears.
The alarm is excluded in manual mode.
Causes/solutions

Check the condition of the external device, re-
place it if it is damaged.

If an alarm appears but the device is in good
condition:
o
The cable is faulty or worn, replace it.
N° Description
A54 Minimum threshold alarm
Troubleshooting:
The pressure of the system does not exceed the set
value of the Minimum threshold parameter (r54).
After the delay time par t54 all the pumps are
stopped and protected against dry running.
The alarm is excluded in manual mode.
Causes/solutions

The pump (impeller or diffuser) is damaged.
Contact the technical assistance service.

The motor doesn't run:
o
It is damaged and must be replaced. Con-
tact the technical assistance service.
o
The thermal protector inside the motor is
faulty or broken.
o
The capacitor is broken.
Reset
Reset
Auto