Instruction manual V 2.3
28
PWM 230 - PWM 400 - PWM 400/7.5
Instruction manual
For PWM 400 and PWM 400/7.5 the motor must be configured to work with a three-phase set of voltages of
400V rms in amplitude.
Typically, for electro pumps absorbing up to 5,5 KW a star wiring is used, whereas for higher power a delta
wiring is used (the indications shown on the rating plate or on electro pump terminal board should always be
followed, anyway).
The current to be set refers to 400V operation.
If the set value is lower than the correct one, during operation the “oC” error will be displayed as
soon as current will exceed the set value for enough time.
If the set parameter is higher than the correct one, the amperometric protection will be activated
when current is already beyond the motor’s safety threshold.
An electrical motor driven by PWM 230 and wrongly used with a star configuration or
driven by PWM 400 or PWM 400/7.5 and wrongly used with a delta configuration may be seriously
damaged.
5.1.2.2
Fn: Setting the rated frequency
This Parameter represents the rated frequency of the electro pump and can range from 50Hz to 130 Hz
(default is “--”, i.e. not set).
By pressing the “+” or “-” keys a frequency of 50Hz or 60 Hz can be selected. Holding these keys pressed for
at least 3 sec allows changing the frequency at steps of 1 Hz inside the above mentioned range.
A wrong setting of the rated frequency can damage the electro pump.
Note:
each modification of Fn is interpreted as a system change; hence FS, FL and FP will automatically
take the default value.
5.1.2.3
rt: Setting the direction of rotation
Possible values: 0 and 1
If direction of rotation of the electro pump is wrong, it is possible to invert it by changing this parameter.
If you cannot check the direction of rotation of the motor directly, proceed as follows:
o
Open a user and take note of the frequency (parameter Fr with MODE key from Go/Sb).
o
Without changing the amount of water taken, change the rt parameter and take note of the frequency
Fr again.
o
The correct rt parameter is the one that requires a lower Fr frequency, with the same amount of
water taken.
Warning: for some electro pumps Fr change between the two rt values could be unappreciable, so that it
could be difficult to understand which is the right direction of rotation. In this case, we can repeat the above-
mentioned experiment, but instead of taking note of the frequency, we can try taking note of the absorbed
phase current (“C1” parameter with button MODE from Go/Sb). The correct rt value is the one requiring the
lowest phase current C1.
5.1.2.4
od: Setting the operating mode of the PWM
Possible values: 1 and 2
The factory setting mode is 1, which adapts to most installations. If pressure oscillates and a change of GI
and GP parameters is ineffective (see sec. 5.1.3.2 and 5.1.3.3), a switch to mode 2 can be helpful.
