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VLT
®
MICRO
In the following examples the output frequency and direction of motion is controlled by a
potentiometer connected to the external terminals or the potentiometer in the Digital
Keypad/Display. Observe the interaction and effect of parameters: Pr.48, 49, 50, 51 on
the potentiometer operation.
Example 1: The configuration in this example is the most common. Set Pr.00 to d00,
d01 or d02 and select J5, J6, J7 jumper settings to control the output frequency:
through potentiometer in the Digital Keypad/Display, or through the external AV1: 0-10 V,
4-20 mA.
Example 2: In this example the output frequency range is 10 Hz to 60 Hz. Turning the
potentiometer fully counter clockwise, corresponds to an output frequency of 10 Hz.
Turning the potentiometer fully clockwise, to the stop, corresponds to 60 Hz. The
midpoint corresponds to 40 Hz. The effective AVI signals are: 0-8.33 V or 4-13.33 mA.
Example 3: In this example the Process Signal Gain (Pr.50) is d83%. The control range
of the potentiometer is 10 - 60 hz as shown below. The corresponding range on the
external AVI terminals is: 0-10 V and 4-20 mA.
Max. operation Freq.
P03 60Hz
Factory Setting Value
P03 = 60Hz
P48 = 0Hz
P49 = 0
P50 = 100%
P51 = 0
30Hz
0Hz
0V 5V 10V
4mA 12mA 20mA
0V 10V
30
0
60
Hz
Max. operation Freq.
P03 60Hz
Factory Setting Value
P03 = 60Hz
P48 = 10Hz
P49 = 0
P50 = 100%
P51 = 0
0Hz
0V 10V
4mA 20mA
0V 10V
30
0
60
Hz
10Hz
P48 = 10Hz
It's 60Hz
within this
range
Max. operation Freq.
P03 60Hz
Factory Setting Value
P03 = 60Hz
P48 = 10Hz
P49 = 0
P50 = 83%
P51 = 0
0Hz
0V 10V
4mA 20mA
0V 10V
30
0
60
Hz
10Hz
P48 = 10Hz
Calculated method of gain value
P48
P03
P50 = (1 – ) x 100%
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Summary of Contents for 176F7300
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