Delta AS Series Manual page 233

Formula of the output cycle:
Output cycle width = MV (%) x output cycle

Execute the general pulse with modulation instruction (GPWM) to set output cycle width and output cycle
sampling time to manage the cycle.
Example:
If the output cycle is 2000 ms, then the output value is 50% after the PID algorithm is implemented.
Output cycle width = 50% × 2000 ms = 1000 ms

In other words, the GWPM instruction can be set to output cycle width = 1000 and output cycle = 2000.
t =10 0 0 ms
Ou tp u t Y 1 0
T =2 00 0 ms
Note:
1. When tuning the parameters Kc_Kp, Ti_Ki, and Td_Kd (PID_MODE=0), set the Kc_Kp value first, and
then set the Ti_Ki and Td_Kd values to 0. In a controlled environment, you can increase the values of
Ti_Ki (from smaller to bigger) and Td_Kd (from bigger to smaller). When the value of Kc_Kp is 1, the
proportional gain is 100%. That is, the error values increase by a factor of one. When the proportional
gain is less than 100%, the error values decrease. When the proportional gain is greater than 100%, the
error values increase.
2. The parameters which have been automatically tuned are not necessarily suitable for every controlled
environment. You can, therefore, further modify the automatically-tuned parameters, but it is
recommended that you only modify the values of Ti_Ki or Td_Kd.
3. The operand CYCLE is to set the sampling time to use the PID algorithm and refresh MV.
When the number of the channel for measurement is changed, the time to refresh the
4.
measured value also changes. For example, the measured value is refreshed every 200 ms
when there is only 1 channel for measurement. The measured value is refreshed every 800 ms
when there are 4 channels for measurement. The Kc_Kp, Ti_Ki, Td_Kd parameters may differ
when the number of channel for measure is different.
Ch a pt er 7 Tem per at u r e M eas ur em ent M o d u le A S 0 4/ 0 8T C
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