1501 Roanoke Blvd., Salem VA
MonitorPer UnitCorrection
MONITOR INHIBIT OVERSHOOT
0t45close326MonitorPer UnitCorrection0Inhibit Upstream Correctionst45close326
Figure 11 Xray Monitor Inhibit Overshoot
Load Balance（负荷平衡）
The correction rate for each stand is modified by adding a load balancing factor. The load balancing factor is created by comparing the Xray Monitor correction for the stand with that of the delivery stand and applying the difference to an integrator. The rate at which the load balance will be corrected is controlled by limiting the amount of load balance correction which will be added during each scan of the integrator. Load balance should be tuned to work much slower than the basic Monitor loop but should be fast enough to distribute head end and temperature rundown corrections evenly to all stands.（引入负荷平衡系数可改变各机架修正速率。通过比较末机架和其它机架的X射线监控AGC修正量并将二者之差输入积分器来建立负荷平衡系数。对积分器每个扫描周期采集的负荷平衡修正量加以限制可以控制负荷平衡修正率。与基本的监控AGC回路相比，负荷平衡的运行周期可以调到慢的多的水平。但是对于带钢头部以及温降较大部分的修正，它又可快到足以将修正量平滑地分配到各个机架。）
Figure 12 shows the tendency of Monitor to shift load toward the delivery end of the mill and how the Balance scheme works to restore load distribution.（图12显示了监控AGC将的趋势；同时还显示了平衡方案重建负荷分配的过程。）
File Name: 12488574.doc RequisitionName: Req.No. Hot Mill Automatic Gage Control
User's Guide
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1501 Roanoke Blvd., Salem VA
监控AGC负荷平衡方MONITOR BALANCE SCHEMEMonitorPer UnitCorrection
Monitor Shifts Load Toward Deliviery234LoadShiftsTowardDelivery监控AGC向出口机架转移负荷 t05closeThe delivery correctsfaster because it has ashorter transport time soit provides morecorrection.由于传输时间短，修正快，所以末机架提供更多的修正量 6MonitorPer UnitCorrectionEffect of Monitor Balance Scheme监控AGC负荷平衡方案的结果
t04close532Load is graduallybalanced负荷逐渐平衡 6Note Delivery Stand Correctionwill stay at same level onlyif Gagemeter Gain = 1.0注意：仅当厚度计方式之增益=1时，末机架修正量才保持在同一水平 Figure 12 Xray Monitor Balance
Tension Effects（张力影响）
Another use for independent control of each stand correction is to prevent the incorrect action that would occur when tight threads occur. Tight threads occur when the references for the gaps and speeds for two adjacent stands are not coordinated properly causing too much tension between the stands. The tension will cause extra reduction in the strip. If gauge is light because of a tight thread, the Xray Monitor would provide corrections which would open the gaps. As the Xray Monitor opens the stand gap, the stand will draw the strip into it faster which will cause even more tension. The additional tension will offset the effect of opening the gap and there will be little net effect on gauge. A tight thread is detected by a low Looper height. In this case, the stand
correction is inhibited until the Looper has corrected speeds and the Looper height returns to normal.(另一种机架修正控制功能是为了防止当相邻机架间出现拉钢时系统采取不正确的措施。拉钢是由于两个相邻机架的辊缝和速度基准值不是很匹配使得机架间张力增大引起的。张力的增大会使带钢变的比预期的薄。此时X射线监控AGC会打开辊缝从而给出一个修正量。随着辊缝的打开，带钢速度加快，会使张力变的更大。打开辊缝而带来的影响虽然会被增加的张力抵消，但仍会对厚度产生轻微影响。拉钢可由活套高度的降低检测出来。基于上述原因：机架修正功能在活套已对速度进行修正以及活套恢复正常高度之前将被禁止。)
If there was a very loose thread for the Looper before the delivery stand and the strip was too thick, the Monitor would close the delivery stand gap. Closing the gap would reduce the mass flow out of and in to the delivery
File Name: 12488574.doc RequisitionName: Req.No.
Hot Mill Automatic Gage Control
User's Guide
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1501 Roanoke Blvd., Salem VA
stand and make the loose thread worse and possibly contribute to a cobble. Therefore, if there is a loose thread and the strip is too thick, the Monitor correction will be held until the Looper has corrected speeds and the Looper height.（如果末机架前堆钢现象严重，带钢太厚，则监控AGC将减小末机架辊缝。辊缝的减小会使进、出末机架的秒流量减小从而使堆钢情况恶化以至于引起废钢。因此，如果出现堆钢并且带钢超厚，则监控AGC在活套已对速度进行修正以及活套恢复正常高度之前将被禁用。）
Figure 13 summarizes tension interactions with the Monitor function. （图13为 简述了张力对监控AGC的干挠。）
活套误差及监控AGC的修正 Looper Error and Monitor CorrectionNORMALLooper can Correct Mass Flow Changesintroduced by Monitor Corrections活套能修正监控AGC引起的秒流量变化
TIGHTTension Causes Light Strip张力引起带钢变轻（拉钢） Monitor Opens Gap cause Light监控AGC打开辊缝引起变轻（拉
钢） Exit Gage Increases BUTOpening Gap increases Mass Flow exit出口厚度增加但
打开辊缝增加了出口秒流量 Mass Flow entry must Increase入口秒流量也必须增加 Entry Thickness not changing so Speed Increases入口厚度未变化所以速度增加
Strip Tension Increases so Exit Gage decreases 带钢张力增加所以出口厚度减小
WIDTH NECKING and LIGHT STRIP拉窄并变轻
LOOSEIf Strip were Heavy Monitor would Close GapExit Gage DecreasesBUTExit Mass Flow Decreases如果超厚严重监控AGC会减小辊缝 出口厚度会减小
但
出口秒流量减少 入口秒流量必须减少 Mass Flow Entry must DecreaseEntry Thickness not changing so Speed Decreases入口厚度未变化所以速度降低
带钢拱起或,绊在侧导板上
Strip Piles Up or gets caught in the Side GuideCOBBLE
废钢
Figure 13 Tension Effects and Looper Position（张力影响及活套位置）
Draft Compensation（压下量补偿）
The Xray Monitor correction for each stand is multiplied by a draft compensation factor to relate the amount of correction applied to each stand to the percent of total draft attributed to that stand. The resulting Xray Monitor Gap Correction will be provided to the gap control. The correction value before multiplication by the draft
compensation can be used to compare the relative Xray Monitor correction of each stand with the delivery stand. When this correction value is equal in all stands, the Xray Monitor correction is distributed evenly between stands and the effect of Xray Monitor correction on stand loads should be equal.（X射线监控AGC对各机架的修正量乘以一个压下量补偿系数（该系数与对各机架总修正量占某机架总压下量的百分比有关）得到X射线监控AGC的辊缝修正量，该修正量送给辊缝控制器。乘以压下量补偿系数之前的修正值可用来比较X射线监控AGC对各机架修正量与对出口机架修正量之间的关系。如果所有机架的乘以压下量补偿系数之前的修正值相等，说明各机架X射线监控AGC的修正量分配比较均匀，同时因此而引起的负荷的变化也相等。）
Maximum Correction Clamp（最大修正量箝位（电路）保持）
The correction output is clamped to limit the gap correction that the Xray Monitor can introduce. The clamps are before multiplication by Draft Compensation so the clamp settings are relative to the last stand Monitor
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Hot Mill Automatic Gage Control
User's Guide
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correction clamps. （X射线监控AGC的修正量输出经过箝位电路以便对辊缝修正量限幅。箝位电路先要乘以压下量补偿，所以箝位电路设定与最后一个机架监控AGC修正量箝位电路有关。）
The correction for each stand is zeroed as the strip leaves that stand and held to zero until Monitor becomes active on the next bar. The Percentage Monitor Correction for the Delivery Stand is displayed by the Man Machine Interface.（各机架抛钢后修正量清零，直到下一块钢来时监控AGC重新激活为止一直保持零。出口机架的监控AGC修正量百分数在人机接口上显示。）
Gagemeter Dependency（厚度计AGC相关属性）
The Xray Monitor Regulator gap correction is a gauge offset which can be input directly by the stand Gap
control when Gagemeter is on. For example, if the correction is -1 mil, the gap control might close the gap by 4 mils to achieve the additional mil of reduction. However, when Gagemeter is off, the Gap control is a position regulator (not a gauge regulator) and will adjust the gap by the same amount as the change in position reference. Therefore when Gagemeter is off, the correction must be multiplied by the stand dS/dh to provide the gap
control with a position offset which accounts for stretch. For example, if the correction is trying to introduce a 1 mil reduction in gauge, the correction to the Gap control must be -5 mils to account for stretch in the mill housing. The correction value is \(X射线监控调节器对辊缝的修正量是一个厚度偏置值，当厚度计AGC为ON时该值直接输入机架辊缝控制器。例如：假如修正量是-1 mil，辊缝控制器可能要将辊缝减小4 mils才能达到将带钢减厚-1 mil的目的。可是，当厚度计AGC为OFF时，辊缝控制变成一个位置调节器（不是厚度调节器），此时对辊缝的调节量等于辊缝设定基准的变化量。因此，当厚度计AGC为OFF时，修正量必须乘以机架的dS/dh从而得到一个已考虑了轧机弹跳因素的位置偏置量送给辊缝控制器。例如：如果修正量试图将厚度减小1 mil，则考虑到轧机牌坊的弹跳，送给辊缝控制的修正量必须为-5 mil。厚度计AGC在ON/OFF之间切换时修正值不会“波动”。)
Since the Gagemeter Gain affects the amount of gap movement, it also affects the rate of the Xray Monitor correction. Therefore, the Monitor Gain must be modified when the Gagemeter Gain changes. If the Gagemeter gain increases, the Monitor Gain must be reduced or the Monitor correction will cause extra overshoot. The Monitor uses the Gagemeter Gain to modify Monitor Gain to maintain a consistent Monitor response.（因为厚度计AGC增益影响辊缝移动总量，也影响X射线监控AGC修正速率。因此，当厚度计AGC增益变化时，X射线监控AGC增益也必须改变。如果厚度计AGC增益增加，则X射线监控AGC增益就必须减小，否则X射线监控AGC修正量将引起额外的超调。X射线监控AGC使用厚度计AGC增益来修改X射线监控AGC增益以便维持X射线监控AGC响应时间不变。）
Interfaces（接口）
Xray Monitor assumes the following signals are available:（X射线监控AGC要用到以下信号：）
? ? ? ? ? ? ? ? ?
Metal in Stand（带钢在机架中）
Gagemeter Selection（厚度计AGC已选择） Gagemeter Gain （厚度计AGC增益） Gap Manual Moves（辊缝手动改变） Stand dS/dh（机架dS/dh） Stand Strip Speed（机架带钢速度） Interstand distances（机架间距离） Stand Dummied（机架空过） Looper Position（活套位置）
File Name: 12488574.doc RequisitionName: Req.No. Hot Mill Automatic Gage Control
User's Guide
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The Monitor Function expects the Xray gage to provide an Analog Xray Deviation, target thickness, a
composite gage Setup OK boolean, a gage selected boolean and a gage measuring boolean.（X射线监控AGC功能需要X射线测厚仪提供以下信号：模拟量厚度偏差信号、目标厚度、测厚仪OK综合信号（布尔型）、测厚仪被选中信号（布尔型）以及测厚仪正在测量布尔信号。）
Each stand expects the last stand to provide the Monitor Correction rate, an Auto Fan offset, an Auto Fan active boolean and an Inhibit Overshoot boolean. （各机架需要末机架提供X射线监控AGC修正速率、Auto Fan偏置、Auto Fan激活布尔信号以及一个超调抑制布尔信号。）
Each stand expects the delivery stand to provide its Monitor Correction. （各机架需要末机架提供它的X射线监控AGC修正量。）
The Xray Monitor function requires signal from the Xray gage.（X射线监控AGC功能需要来自X射线测厚仪的信号。）
Modes of Operation（工作方式）
There are three modes of operation for the Xray Monitor; OFF, LOCKON and ABSOLUTE. However, the
Man Machine Interface system will only allow the Operator to request the Xray Monitor correction ON or OFF. When the Operator selects Xray Monitor ON, ABSOLUTE will be selected if all permissives are satisfied. If the Operator deselects Xray Monitor in bar, the Xray Monitor correction will freeze for the remainder of the bar.（X射线监控AGC有3种工作方式：OFF（禁用）, LOCKON（锁定） 和ABSOLUTE（绝对）。可是人机接口系统只提供操作工选择X射线监控AGC修正ON/OFF的权利。当操作工选择X射线监控AGC为ON时，如果所有允许条件满足则进入ABSOLUTE（绝对）方式。假如在带钢轧制过程中（in bar）操作工取消了X射线监控AGC为ON的选择，则在剩余带钢轧制过程中X射线监控AGC修正量冻结（保持最后状态）。）
The Man Machine Interface will also supply a direct action pushbutton which will allow the Operator to force LOCKON Xray monitor on a per bar basis. When ABSOLUTE Xray Monitor is selected, the Operator can select AUTO FAN. Refer to the following table for general selection, permissive and control information for each mode.（人机接口还为操作工提供一个直接出发按钮用于强制X射线监控AGC在本块带钢内进入LOCKON（锁定）方式。当选择了绝对X射线监控AGC时，操作工可选择AUTO FAN功能。有关各种方式的常规选择、允许条件以及控制信息等可参阅下表。） Xray Monitor (MON) Modes of Control MODE SELECTION PERMISSIVE AUXILIARY SELECTIONS AVAILABLE MANUAL DIRECT ACTION CONTROL AVAILABLE NONE NONE CONTROL OFF MMI Monitor Off or AGC Off MMI Monitor On NONE XRAY GAGE SELECTED, SETUP OK, READY. XRAY GAGE SELECTED, SETUP OK, READY, NOT SATURATED NONE AUTO FAN, AUTO LOCKON Xray Monitor Correction is frozen for the remainder of the current bar and zeroed for subsequent bars. ON (ABSOLUTE) Xray Monitor Correction will start a short delay after the Gage senses metal. The correction will attempt to drive the measured deviation to zero to make the strip thickness equal to the Xray Gage target thickness. LOCKON OC2000 Lockon Pushbutton NONE NONE Xray Monitor Correction after a short sampling period after a short delay after the Gage senses metal. The correction will attempt to drive the measured deviation to that measured during the sampling period.
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File Name: 12488574.doc RequisitionName: Req.No. Hot Mill Automatic Gage Control
User's Guide