Chapter 6 Usage of Various Functions
6-15
(5) High Frequency Noise Depression Ratio
High frequency noise removal ratio is used for derivative control operation, and shows
the ratio of high frequency noise depression. If there is a lot of high frequency noise in
the control system, select the value as higher value.
Otherwise, leave the 1. The range of parameter is 0 ~ 10 and it is not scaled up, so
input the designated value directly. (it is possible that parameter value designates ‘D’
area also)
(6) Proportional gain
It is the ratio of proportional operation. Proportional gain is the 100 times scaled up
value. (Setting range: 1~10000)
(7) Derivative time and integral time
I_TIME and D_TIME are 10 times scaled up. For example, input 18894 if the
designated I_TIME value is 1889.4. The range of actual input is 0 ~ 20000. (it is
possible that parameter value designates ‘D’ area also)
(8) Mode command set (P, I, D control)
Following 7 operation modes are available.
No. EN_P EN_I EN_D PWM output Operation
1
1(Enable) 0(Disable) 0(Disable) 0(Disable)
P operation
2
1(Enable) 1(Enable) 0(Disable) 0(Disable)
PI operation
3
1(Enable) 1(Enable) 1(Enable) 0(Disable)
PID operation
4
1(Enable) 0(Disable) 0(Disable) 1(Enable)
P operation/PWM output
5
1(Enable) 1(Enable) 0(Disable) 1(Enable)
PI operation/PWM output
6
1(Enable) 1(Enable) 1(Enable) 1(Enable)
PID operation/PWM output
7
0(Disable) 0(Disable) 0(Disable) 0(Disable)
On/Off operation
• Other operation modes, such as PD or I, are not permitted..
• If PWM output is selected, Manupulated value is outputted PWM output to designated output.
(9) PWM set
PWM(Pulse Width Modulation) is a output method which changes on-off duty of output
pulses by calculated manipulation value. Fig 7.9 shows example of PWM output.
Using PWM output, PID control system can be constructed easily without D/A
conversion module and power regulator.
When PWM is designates , ‘scan time’ item is disabled and ‘PWM’ items can be
designated. In this case, scan time is set to designated PWM output period. The range
of PWM output period is 1 ~ 10 seconds, and actual input range is 10 ~ 100. PWM
output point is only available for output contact of main unit.
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