Panasonic VF200, Instruction Manual

Page: 245 / 289

Appendix Function Parameter List
238
■
Bias signal of PID control (setting value = “2”)
・
The 2
nd
analog input terminal can be used as measured value of PID control
(bias signal).
・
Input signals (0 to 5 V, 0 to 10 V, 4 to 20 mA and 0 to 20 mA) are fed back as
bias signal of PID control (setting example: -10% to +10%).
・
Bias value can be converted inside the inverter with parameter “P126: The
2
nd
Bias Frequency Setting”, “P127: The 2
nd
Gain Frequency Setting” and
“P157: The 2
nd
Analog Superimposed Value Setting”.
<Example> When the analog input ranges from 0 to 5 V and both the 2
nd
bias
value and the 2
nd
gain are set to “10”
・
After parameter P124 is set to “2”, set target value (SP) to the output
frequency through parameter “P004: Frequency Setting Signal” to perform
PID control that approaches target value SP depending on the bias signal
input to the analog input terminals. The output frequency will also be changed
accordingly. In this case, the inverter’s output frequency is determined by the
following formula.
Output frequency = Max. output frequency
×
(The 1
st
frequency setting signal
(%) + bias signal (%))
・
The value of the 1
st
frequency setting signal (%) depends on the value of
parameter “P004: Frequency Setting Signal”.But when parameter “P004:
Frequency Setting Signal” is specified as “1” or “7”, parameter “P111: PID
Target Value” can be used.
・
Parameters for PID control can be set with parameter P106 to P111.