ENGLISH
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5.3 Troubleshooting on initial installation
Fault Possible
causes
Remedy
The display shows
BL
1) No water.
2) Pump not primed.
3) Entry of setpoint too high for
pump.
4) Inverted direction of rotation.
5)
Incorrect setting of pump
current RC (*).
6) Maximum frequency too low.
1) 2) Prime the pump ad ensure that there is no air in the
pipelines. Check that intake or any filters are not
obstructed Check that the pipeline from the pump to
the inverter is not damaged or leaking.
3) Lower the setpoint or use a pump suited to system
requirements.
4) Check the direction of rotation (see par.6.5.2).
5) Set a correct value for pump current RC(*) (see
par.6.5.1).
6) If possible, increase FS (see par.6.6.6).
The display shows
OF
1)
Excessive absorption.
2) Pump blocked.
3) Pump absorbs high current on
start-up.
1) Check type of connection; star or delta. Check that
the motor does not absorb current over the max.
admissible value for inverter. Check that the motor
has all phases connected.
2) Check that the impeller or motor is not blocked or
obstructed by foreign bodies. Check motor phase
connections.
3) Reduce the acceleration parameter AC (see par.
6.6.11)
The display shows
OC
1) Incorrect pump current setting
(RC) (*).
2) Excessive absorption.
3) Pump blocked.
4) Inverted direction of rotation.
1) Set RC with the current according to the type of
connection (star or delta) as stated on the motor
dataplate (see 6.5.1)
2) Check that the motor has all phases connected.
3) Check that the impeller or motor is not blocked or
obstructed by foreign bodies.
4) Check the direction of rotation (see par.6.5.2).
The display shows
LP
1) Low power supply voltage.
2) Excessive voltage drop on line.
1) Ensure presence of correct line voltage.
2) Check the power cable section (see section 2.3).
Regulation
pressure greater
than SP
FL setting too high.
Reduce minimum operating frequency FL (if electric
pump enables this).
The display shows
SC
Short circuit between phases.
Ensure that the motor is in the correct condition and
check connections to the latter.
The pump never
stops
Unstable pressure regulation.
Correct GI and GP (see par. 6.6.4 and 6.6.5)
The display shows:
Press + to align this
config.
One or more inverters have
sensitive parameters not aligned.
Press + on the inverter that has the most recent and
correct configuration of parameters
The Multi-inverter
system does not
start and says
firmware
incompatible
Firmware not aligned with the
same version on all inverters.
Perform the automatic update procedure among
inverters, see par 9.2
The Multi-inverter
system does not
start and says
products
incompatible
Products of different type of size
put in communication with one
another.
Obtain inverters of the same type and size to create
multi-inverter systems, see par. 4.2
*Only for inverter type M/T e T/T
Table 17: Troubleshooting
