FujiFilm FRENIC5000G11S Series, Technical Information

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2-39
Chapter 2
3. Function Explanation
2
•
PID contro
l
PID control combines the P operation, the I operation which
removes deviation, and the D operation which suppresses
vibration. This control achieves deviation-free, accurate, and
stable responses.
This control is effective for loads for which the time from
deviation occurrence to response return is long.
• Adjusting PID set value
Adjust the PID value while monitoring the response wave-
form on an oscilloscope or other instrument if possible.
Proceed as follows:
– Increase the value of “H22 (P-gain)” without generating
vibration.
– Decrease the value of “H23 (I-gain)” without generating
vibration.
– Increase the value of “H24 (D-gain)” without generating
vibration.
Adjust the response waveform as follows:
To remove the overshoot, increase the value of “H23 I-gain,”
then decrease the value of “H24 D-gain.”
To stabilize response quickly (i.e., allowing for a little
overshoot), decrease the value of “H23 I-gain,” or increase the
value of “H24 D-gain.”
To suppress vibration with a period longer than the value of
“H23 I-gain,” increase the value of H23.
To suppress vibration with a frequency roughly equivalent to
the value “H24 D-gain,” decrease the value of H24. If there is
residual vibration with 0.0, decrease the value of “H22 P-gain.”
■
H25 PID control (Feedback filter)
This filter is for feedback signal input from terminal 12 or C1.
This filter stabilizes operation of the PID control system. A set
value that is too large, however, deteriorates response.
- Setting range: 0.0 to 60.0s
■
H26 PTC thermistor (Mode select)
Set this function active when the motor has a PTC thermistor
for overheat protection.
- Set value 0: Inactive
1: Active
Connect the PTC thermistor as shown in the figure below.
The protective function uses the external alarm input to
terminals X1 to X9 when selected. The trip mode is activated
by “OH2: External alarm input.
H25 FB FILTER
Response
After adjustment
Before adjustment
Time
Response
After adjustment
Before adjustment
Time
Response
After
adjustment
Before adjustment
Time
Response
After adjustment
Before adjustment
Time
H26 PTC MODE
H27
13
C1
0V
250
Ω
11
Operation level
1k
Ω
PTC
thermistor
10V DC
Comparator
External
alarm
R
R
(OH2)
Chapter02J(P26˜43).p65
07.8.9, 12:26 Page 39
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