Chapter 12 Description of Parameter Settings|CFP2000 Series
12.1-03-2
Reserved
Positive/negative Bias Mode (AVI1)
Positive/negative Bias Mode (ACI)
Positive/negative Bias Mode (AVI2)
Factory Setting: 0
Settings 0: Zero bias
1: Lower than or equal to bias
2: Greater than or equal toe bias
3: The absolute value of the bias voltage while serving as the center
4: Serve bias as the center
In a noisy environment, it is advantageous to use negative bias to provide a noise margin. It is
recommended NOT to use less than 1V to set the operation frequency.
Analog Frequency Command for Reverse Run
Factory Setting: 0
Settings
0: Negative frequency is not valid. Forward and reverse run is controlled by
digital keypad or external terminal.
1: Negative frequency is valid. Positive frequency = forward run; negative
frequency = reverse run. Run direction can not be switched by digital
keypad or the external terminal control.
Parameter 03-10 is used to enable reverse run command when a negative frequency (negative
bias and gain) is input to AVI or ACI analog signal input (except AUI).
Condition for negative frequency (reverse)
1. Pr03-10=1
2. Bias mode=Serve bias as center
3. Corresponded analog input gain < 0(negative), make input frequency be negative.
In using addition function of analog input (Pr03-18=1), when analog signal is negative after adding,
this parameter can be set for allowing reverse or not. The result after adding will be restricted by
“Condition for negative frequency (reverse)”
In the diagram below: Black line: Curve with no bias. Gray line: curve with bias
1051 234 6789
V
60Hz
54Hz
10 6 12345798
-V
Frequenc
Pr.03-07~03-09 (Positive/Negative Bias Mode)
Pr.03-10 (Analog Frequency Command for Reverse Run)
Pr.03-11 Analog Input Gain (AVI)= 100%
Pr.03-03=10%
0: Negative frequency is not valid.
Forward and reverse run is controlled
by digital keypad or external terminal.
1: Neagtive frequency is valid. Positive
frequency = forward run; negative
frequency = reverse run. Direction
can not be switched by digital keypad or
external teriminal control.
0: No bias
1:
2: Greater than or equal to bias
3: The absolute value of the bias voltage
while serving as the center
4: Serve bias as the center
Lower than or equal to bias
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