Instruction manual V 2.3
26
PWM 230 - PWM 400 - PWM 400/7.5
Instruction manual
4.3 First
installation
troubleshooting
PWM message
Possible causes
Solution
EC
Current (rC) or frequency (Fn) of
the pump not set
Set “rC” parameter (see sec. 4.1)
Set “Fn” parameter (see sec. 4.1)
bL
1) Lack of water
2) Pump unprimed
3) Reverse rotation direction
1-2) Prime the pump and check there is no air in the pipeline.
Check that suction pipe and filters are not occluded. Check
that the pipeline from the pump to PWM is not broken and
has no serious leakages.
3) Check the direction of rotation (see sec. 5.1.2.3)
OF
1) Excessive current absorption
2) Pump blocked
1) Check the connection type, delta or star. Check that the
current absorbed by the motor does not exceed the
maximum current the PWM can deliver
2) Check that no foreign body is opposing to the impeller or
the motor’s motion. Check the phases' connection of the
motor.
OC
1) Wrong setting of the pump
current (rC).
2) Pump blocked
1) Set rC with the current related to the type of wiring (star or
delta) written on the rating plate (see sec. 4.1).
2) Check that no foreign body is opposing to the impeller or
the motor’s motion. Check the phases' connection of the
motor.
E1
or
LP
1) Low supply voltage
2) Excessive voltage drop on the
line
1) Check the power supply voltage.
2) Check the power cord wires’ section
(see sec. 2.2 and 2.3)
Blinking Sb
or
Go
(Applies when two PWM or PWM
and the “Da Vinci” controller board
are connected)
Communication failure
Check the correct Parameter setting Ad (see sec. 5.1.2.6)
Check the communication cable’s integrity and proper
connection.
Check the communication cable’s pin out (see sec. 2.5)
bP
Disconnected pressure sensor
Check the pressure sensor is properly connected
SC
Short circuit between the phases
Ensure the motor is properly working and check its
connections to PWM
