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CHAPTER 4 - Start-up and adjustment of the drive
been concluded. For the possible configurations, on the other hand, the choice is limited to a
small number (it is always necessary to refer to the predefined configurations, setting the
flags in the order indicated).
The three keys not yet defined INV, RUN and STOP, have a fixed function, no matter under
which window and condition they appear. Their function is respectively to invert the speed
reference, to start the motor if it is stopped until it reaches the set speed and to stop the motor
at zero speed.
lf two keys are pressed simultaneously by mistake, the display will show a message of
keyboard error. Press any key to return to the normal condition. The keyboard can be
disconnected from the drive at any time; the condition saved at the moment of disconnection
will reappear when reconnecting the unit.
4.2. 1 Description of references window
The actual speed in rpm is always displayed on the second line. On the contrary, the first
reference is the speed of the motor shaft in rpm, visualized as follows:
The maximum settable value is limited by parameter P4, W-MAX, that represents the
maximum absolute value of speed in rpm.
The second reference is the value of current, that can be set when the motor is controlled in
torque mode:
The settable value changes from +200.0 %In to - 200.0 %In, in relation to the rated current of
the drive; the value that can be set is limited by parameter P5, I_MAX, that represents the
maximum absolute value of current, always referred to the rated current. On the contrary, if,
instead of considering this parameter as current limit, analog current limit is used, then l_ref
visualizes it (in this case I-MAX has to be set at its maximum value, equal to 200.0% In)
4.2.2 Description of parameters window
The parameters window shows all parameters that can be modified with the keyboard: the
total number is 38 among control adjustments, input and output configurations and internal
values of the drive. The parameters list with a description of the function and of the values
range is shown below.
P1, KP, Proportional gain: it is the proportional gain of the PI speed digital controller.
P2, KI, Integral gain: it is the integral gain of the PI speed digital controller: the KP/KI
relationship determines the position of the zero of the regulator.
P3: Parameter currently not used.
P4, W-MAX, Maximum velocity: it is the maximum value of speed reference, expressed in
rpm.
P5, I_MAX, Maximum current: it is the maximum current value that can be set, measured in
rms value. This also acts as saturation limit in the case of speed control; in case of torque
limit with analog signal, this parameter must be set to the maximum value, that is
I_MAX=200.0% ln.
MANIU04.9607 GB 03/97
Page 4.3
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