收藏本站
PID Adjustments
In some applications, it may be necessary to fine tune the Auto-Tune
calculated PID parameters. To do this, a chart recorder or data logging device is
needed to provide a visual means of analyzing the process. Compare the actual
process response to the PID response figures with a step change to the process.
Make changes to the PID parameters in no more than 20% increments from the
starting value and allow the process sufficient time to stabilize before evaluating
the effects of the new parameter settings.
In some unusual cases, the Auto-Tune function may not yield acceptable
control results or induced oscillations may cause system problems. In these
applications, Manual Tuning is an alternative.
PROCESS RESPONSE EXTREMES
OVERSHOOT AND OSCILLATIONS
INPUT
SP
TIME
TO DAMPEN RESPONSE:
- INCREASE PROPORTIONAL BAND.
- INCREASE INTEGRAL TIME.
- USE SETPOINT RAMPING.
- USE OUTPUT POWER LIMITS.
- RE-INVOKE AUTO-TUNE WITH A
HIGHER AUTO-TUNE CODE.
- INCREASE DERIVATIVE TIME.
- CHECK CYCLE TIME.
MANUAL TUNING
A chart recorder or data logging device is necessary to measure the time
between process cycles. This procedure is an alternative to the controller ’s Auto-
Tune function. It will not provide acceptable results if system problems exist.
1. Set the Proportional Band ( ???? ) to 10.0% for temperature models (T16) and
100.0% for process models (P16).
2. Set both the Integral Time ( In?? ) and Derivative Time ( ???? ) to 0 seconds.
3. Set the Output Dampening Time ( ???? ) in Output Module 2??? to 0 seconds.
4. Set the Output Cycle Time [CYCt] in Output Module 2??? to no higher than
one-tenth of the process time constant (when applicable).
5. Place the controller in Manual ???? Control Mode ??nF in the Hidden Loop
and adjust the % Power to drive the process value to the Setpoint value.
Allow the process to stabilize after setting the % Power. Note: ??nF must be
set to ???? in Parameter Lockouts Module ???? .
6. Place the controller in Automatic ( ???? ) Control Mode ??nF in the Hidden
Loop. If the process will not stabilize and starts to oscillate, set the
Proportional Band two times higher and go back to Step 5.
23
SLOW RESPONSE
INPUT
SP
TIME
TO QUICKEN RESPONSE:
- DECREASE PROPORTIONAL BAND.
- DECREASE INTEGRAL TIME.
- INCREASE OR DEFEAT SETPOINT RAMPING.
- EXTEND OUTPUT POWER LIMITS.
- RE-INVOKE AUTO-TUNE WITH A
LOWER AUTO-TUNE CODE.
- DECREASE DERIVATIVE TIME.
7. If the process is stable, decrease Proportional Band setting by two times and
change the Setpoint value a small amount to excite the process. Continue
with this step until the process oscillates in a continuous nature.
8. Fix the Proportional Band to three times the setting that caused the oscillation
in Step 7.
9. Set the Integral Time to two times the period of the oscillation.
10. Set the Derivative Time to 1/8 (0.125) of the Integral Time.
11. Set the Output Dampening Time to 1/40 (0.025) the period of the oscillation.
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
P1Z9ACR900W12 DIODE MOD PWR-BRIK DL 1200V 740A
PA3716 TOOL REPLACEMENT HEAD SET
PAXCDL10 ANALOG OUTPUT CARD
PAXLC800 COUNTER 8-DIGIT BI-DIR COUNT
PAXLPT00 METER PROCESS TIME 6-DIGIT
PAXLR000 METER RATE INDICATION 6-DIGIT
PB52233SLK PROJ BOARD COLDFIRE M52
PD412411 DIODE MOD ISO DUAL 2400V 1100A
相关代理商/技术参数
P1641110 制造商:Red Lion Controls 功能描述:PROCESS CONTR, 1/16DIN DC ANALOG 2 ALRM 制造商:Red Lion Controls 功能描述:DC W/ANALOG OUT 2 ALARMS
P1-64121 制造商:OTTO 功能描述:Pushbutton Switches Style F Scrw LoLev Red Button 制造商:OTTO Engineering Inc 功能描述:Switch Push Button N.O. Round Button 10A 115VAC 28VDC Momentary Contact Screw Panel Mount
P1-64122 功能描述:按钮开关 Style F Scrw LoLev Black Button RoHS:否 制造商:OTTO 触点形式: 开关功能: 电流额定值: 电压额定值 AC: 电压额定值 DC: 功率额定值: 安装风格: 照明: 照明颜色: IP 等级: 端接类型: 触点电镀: 执行器: 盖颜色: 封装: 可燃性等级:
P1-64122W 制造商:OTTO 功能描述:Pushbutton Switches Style F Scrw LoLev Black Button 制造商:OTTO Engineering Inc 功能描述:STYLE F,SCREW,LOW
P1-64128 功能描述:按钮开关 Style F Scrw LoLev Gray Button RoHS:否 制造商:OTTO 触点形式: 开关功能: 电流额定值: 电压额定值 AC: 电压额定值 DC: 功率额定值: 安装风格: 照明: 照明颜色: IP 等级: 端接类型: 触点电镀: 执行器: 盖颜色: 封装: 可燃性等级:
P1-64129 功能描述:按钮开关 Style F Scrw LoLev White Button RoHS:否 制造商:OTTO 触点形式: 开关功能: 电流额定值: 电压额定值 AC: 电压额定值 DC: 功率额定值: 安装风格: 照明: 照明颜色: IP 等级: 端接类型: 触点电镀: 执行器: 盖颜色: 封装: 可燃性等级:
P1-64131 制造商:OTTO Engineering Inc 功能描述:Switch Push Button N.O. Round Button 10A 115VAC 28VDC Screw Panel Mount
P1-64132 制造商:OTTO Engineering Inc 功能描述:Switch Push Button N.O. Round Button 10A 115VAC 28VDC Screw Panel Mount