34
less than the
100% Calibration
value.
100% Calibration (43-47)
This calibration value corresponds to the 12 bit value from the A2D when the input signal is at
its maximum level. This defines 100% input signal. For proper operation, the
100%
Calibration
value must be greater than the
0% Calibration
value.
Bias (48-52) Refer to footnote on p.32
The
Bias
parameter is only used in unipolar inputs and defines the minimum value when 0%
signal is input.
Gain (53-57) Refer to footnote on p.32
The
Gain
parameter defines the value when the input is at 100%.
Invert (344-348)
When set to True, the analog input value is inverted before being sent to the destination
parameter.
Status (139-143, Read-Only)
Each analog input A2D reading can be viewed for diagnostic purposes. The resolution and
scaling of the inputs are dependent upon the Bipolar and Type parameters. See chart below
for typical readings:
Voltage
Current
Unipolar
Bipolar
Unipolar
Bipolar
10V
4095
2047
20mA
4095
2047
5V
2047
1023
10mA
2047
1023
0V
0
0
0mA
0
0
-5V
-
-1024
-10mA
-
-1024
-10V
-
-2048
-20mA
-
-2048
Table 10: Analog Input Status Readings
Example - Bipolar Analog Input
Setup Analog Input 2 as a bipolar voltage input to control the internal Reference 3 parameter.
Define the voltage input so that 5V corresponds to 25.00% speed.
1. While the drive is stopped, go to Setup|Programming|Inputs|Analog|Analog Input 2 menu
section.
2. Set
Analog Input 2 Destination
to
Reference 3
(220).
3. Set
Analog Input 2 Polarity
to Bipolar.
4. Set
Analog Input 2 Type
to Voltage.
5. Select Calibrate Analog Input
Step 1. Adjust external voltage to 0 Volts. Press ENT when done.
Step 2. Adjust external voltage to 5 Volts. Press ENT when done.
Step 3. The Elite Pro verifies that the 100% level is greater than the 0% level and
displays the actual levels recorded during the calibration process. Press OK
when done.
6. The
Analog Input 2 Bias
value is ignored with bipolar inputs.
7. Set
Analog Input 2 Gain
to 25.00%.
When 5V is applied to Analog Input 2, a value of 25.00% is written to the
Reference 3
parameter. When -5V is applied, a value of -25.00% is written to
Reference 3
.
Summary of Contents for Elite Pro EPN020-000
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