Santerno Sinus Penta - Scaling Analog Inputs REF, AIN1, AIN2

SINUS PENTA
PROGRAMMING GUIDE
108/486
13.2. Scaling Analog Inputs REF, AIN1, AIN2
NOTE
Please refer to the Sinus Penta’s Installation Guide for hardware details about analog inputs.
Three analog inputs are available: REF, AIN1, AIN2.
They can be voltage inputs or current inputs (switching is made possible through hardware Dip–Switch SW1 and
software parameters) and are bipolar analog inputs (–10V ÷ +10V or –20mA ÷ +20mA).
REF input is single–ended; AIN1 and AIN2 inputs are differential inputs.
Factory setting is as follows: the main speed reference is given by REF analog input, 0V
÷
+10V mode; only motor 1 is
active. Its max. speed and min. speed parameters are C088=1500 rpm and C029=0 rpm respectively.
For the 3 analog inputs, parameters P050 ÷ P064 allow setting the type of signal to be acquired, offset compensation (if
any), scaling to obtain a speed reference or a torque reference, the signal filtering time constant.
Parameter P053 sets the offset of the input analog signal (if P053=0 offset is zero), while parameter P054 defines the
filtering time constant (factory setting: P054 = 5ms).
Type of input: for each analog input, Dip–Switch SW1 allows setting the acquisition method of the input signal: voltage
signal or current signal.
The voltage signal can be bipolar (–10V
÷
+10V) or unipolar (0V
÷
+10V).
The current signal can be bipolar (–20mA
÷
+20mA), unipolar (0mA
÷
+20mA) or can have a minimum offset (4mA
÷
20mA).
The user will set each analog input mode in parameters P050, P055, P060.
Table 26: Analog Input Hardware Mode
Type / Terminals
Name
Type
Dip–Switch
Parameter
Single-ended input/ 1,2
REF
±10V Input
SW1–1 off
P050
0–20mA Input
SW1–1 on
Differential input / 5,6 AIN1
±10V Input
SW1–2 off
P055
0–20mA Input
SW1–2 on
Differential input / 7,8 AIN2
±10V Input
SW1–3 off, SW1–4 5 off
P060
0–20mA Input
SW1–3 on, SW1–4 5 off
PTC Input
SW1–3 off, SW1–4 5 on
See note
NOTE
If AIN2 input is configured as PTC, refer to the MOTOR THERMAL PROTECTION MENU to
select the proper parameters. Its measures are no longer valid.
NOTE
Configurations different from the ones stated in the table above are not allowed.
CAUTION
For each analog input (REF, AIN1, AIN2)
, make sure that the “mode” parameter setting
(P050, P055, P060) matches with the setting of the relevant SW1 Dip–Switches.
Scaling is obtained by setting the parameters relating to the linear function for the conversion from the value read by
the analog input to the corresponding speed/torque reference value.
The conversion function is a straight line passing through 2 points in Cartesian coordinates having the values read
by the analog input in the X-axis, and the speed/torque reference values multiplied by the reference percentage
parameters in the Y-axis.
Each point is detected through its two coordinates.
The ordinates of the two points are the following:
the value of Speed_Min (or Trq_Min for the torque reference) multiplied by the percentage set through
P051a/P056a/P061a/P071a/P073a for the first point; the value of Speed_Max (or Trq_Max for the torque reference)
multiplied by the percentage set through P052a/P057a/P062a/P072a/P074a for the second point.