S20360-SRS 输出模块用于控制传输速度 Kollmorgen
安装表面、支架或转接板有缺陷
未加工或加工不良的安装表面不平，可能导致弯曲或
称重传感器的扭转。这可能导致零点的不稳定性。
6.4.2强制调车
力分流是指部分力分流通过称重传感器。这可能是由于：
通过称重传感器的力受到某种阻碍。例如，
安装不正确，导致无法移动。另一个可能的原因是
辊不能在测量方向上自由移动，可能是因为安装了某些部件
太靠近轴承箱，或由于物体松动而被卡住
在轴承箱和相邻部件之间。
强制分流导致腹板/带材张力指示低于实际腹板/带料张力。
6.4.3称重传感器和转接板的紧固
未正确拧紧或失去预紧力的螺纹接头，原因
在配合面上滑动。称重传感器的紧固尤其重要。如果称重传感器不
如果适当固定，零点将不稳定。在其他表面之间滑动可能导致
同样的症状。
6.4.4轧辊和轴承
设计不当的轴承布置可能会导致高轴向力。卷应该是
一端固定，另一端自由。
如果两端固定 由于轴的膨胀，将产生较高的轴向（推力）
温度上升。
即使是正确设计的轴承布置也可能随着时间而恶化；轴承磨损，
这可能会出现类似的症状，如冷和热之间零点漂移缓慢
或信号中的突然跳跃。
6.4.5从动辊
很少有人怀疑的错误来源是辊本身。在以下情况下，效果尤其关键：
测力传感器上的测量力相对较低。长驱动轴及其相关的万向轴
如果接头维护不当，可能会导致信号不稳定。润滑很重要
压力导管枕式称重传感器，水平测量PFTL 101，用户手册
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3BSE009965R0401 en版本F 27
万向节。还应考虑驱动轴的纵向膨胀。自从
这种膨胀通常由花键进行，花键也必须润滑。症状如下：
信号的不稳定性，例如在慢速运行期间信号的跳跃。
6.5称重传感器、接线盒和
装电线
称重传感器非常坚固，能够承受高过载。压力导管称重传感器的数据
不会缓慢变化，而是逐步变化，通常与工厂中的事件相关。过分的
过载通常会导致零点偏移。
接线盒接触不良会导致间歇性故障。灵敏度和零点都可能变化。
检查所有螺钉端子。不要使用压接在连接导线上的针脚，因为这些针脚通常会起作用
过了一段时间就松了。
电缆，尤其是至称重传感器的电缆，是容易受损的部分。
由于称重传感器绕组的电阻较低，因此很容易检查称重传感器和电缆
来自控制单元。
一次绕组电阻的典型读数为1Ω，二次绕组的输出阻抗为1-3Ω。
电缆或称重传感器中的绝缘故障可能导致灵敏度不正确或零点不稳定。
当称重传感器电路在可断开端子处与接地和控制单元隔离时，很容易测量控制单元的绝缘。
如果电缆布线不正确，它们可能会受到其他电缆的干扰。
S20360-SRS 输出模块用于控制传输速度 Kollmorgen
S20360-SRS 输出模块用于控制传输速度 Kollmorgen
Defective Mounting Surface, Support or Adapter Plates
An unmachined or poorly machined mounting surface, which is uneven, may cause bending or
twisting of the load cell. This may result in instability of the zero point.
6.4.2 Force Shunting
Force shunting means that some of the force is diverted past the load cell. This may be caused by
some kind of obstruction to the force through the load cell. The connecting cables, for example,
have been incorrectly installed and are preventing movement. Another possible cause is that the
roll is not free to move in the direction of measurement, possibly because something is mounted
too close to a bearing housing, or because an object has worked loose and become trapped
between the bearing housing and adjacent parts.
Force shunting causes the web/strip tension indication to be lower than the actual web/strip tension.
6.4.3 Fastening of Load cell and Adapter Plates
Screw joints that have not been properly tightened or have lost their pre-tightening force, cause
sliding at the mating surfaces. Fastening of the load cell is especially critical. If a load cell is not
properly secured, the zero point will be unstable. Sliding between other surfaces may cause the
same symptoms.
6.4.4 Rolls and Bearings
An incorrectly designed bearing arrangement may give rise to high axial forces. The roll should be
fixed at one end and free at the other.
If both ends are fixed there will be a high axial (thrust) force due to expansion of the shaft with
rising temperature.
Even a correctly designed bearing arrangement may deteriorate with time; bearings become worn,
and so on. This may give similar symptoms, such as slow zero point drift between cold and hot
machine, or sudden jumps in the signal.
6.4.5 Driven Roll
A source of error that is seldom suspected is the roll itself. The effect is especially critical when
measuring forces on the load cell are relatively low. Long drive shafts with their associated universal
joints may cause unstable signals if they are not properly maintained. It is important to lubricate
Pressductor PillowBlock Load Cells, Horizontal Measuring PFTL 101, User Manual
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3BSE009965R0401 en Rev F 27
universal joints. Longitudinal expansion of the drive shaft should also be taken into account. Since
such expansion is often taken up by splines, these must also be lubricated. The symptoms are
instability of the signal, for instance jumps in the signal during slow running.
6.5 Fault Tracing of Load Cells, Junction Boxes and
wiring
The load cell is very robust and can withstand high overloads. The data of a Pressductor load cell
does not change slowly, but in steps, usually in connection with an event in the mill. Excessive
overloading usually results in permanent shifting of the zero point.
Poor contact in the junction box causes intermittent faults. Both sensitivity and zero point may vary.
Check all screw terminals. Do not use pins crimped to the connecting wires, as these often work
loose after a time.
The cabling, especially the cable to the load cell, is the part that is most exposed to damage.
Since the resistance of the load cell windings is low, it is easy to check the load cells and cabling
from the control unit.
Typical readings are 1 Ω for the resistance of the primary winding and 1-3 Ω for the output impedance of the secondary winding.
Insulation faults in the cabling or the load cell may cause incorrect sensitivity or unstable zero point.
When the load cell circuits have been isolated from earth and from the control unit at the disconnectable terminals, it is easy to measure the insulation from the control unit.
If the cables are not routed correctly, they may pick up interference from other cables.
S20360-SRS 输出模块用于控制传输速度 Kollmorgen
