导言
如今造纸机传动操控基本上悉数选用沟通变频传动操控体系，而市场上变频器品牌很多，功用各异。面临如此很多的变频器商品，怎么挑选变频器及相应的操控体系成为各厂家的难题，下面简略介绍造纸机对变频器的基本请求，以及怎么挑选变频器。
1、纸机传动特性与变频器机械特性
造纸机传动归于恒转矩负载，所以请求电机选用恒转矩调速。请求变频器作业在恒转矩调速操控状况，所以应当选用恒转矩机械负载变频器。
有的公司关于恒转矩调速和恒功率调速选用不一样类型的变频器，如西门子公司的ECO风机、水泵操控用变频器和MDV、6SE70恒转矩变频器。有的公司关于恒转矩调速和恒功率调速选用同一类型的变频器，关于同一台变频器选用不一样的操控方法所接配的电机不一样，变频器内部参数设置不一样。如ABB公司ACS400、ACS600系列变频器。比方类型为ACS401-0030的变频器在恒转矩调速操控接配电机22Kw，在风机、水泵恒功率操控接配电机为30Kw。所以用户应当了解变频器的机械特性匹配。
2、频率分辨率对纸机传动功用的影响
频率分辨率是衡量变频器的重要指标。频率分辨率包括频率给定分辨率和频率操控分辨率。
1、频率给定分辨率指变频器的给定通道对输入信号的分辨率，通常指模仿输入通道AD的位数。关于通讯通道通常给定精度远远大于模仿通道，所以模仿给定通道若能满意请求，通讯通道是绝对满意的。
通常纸机对传动调速的操控精度请求为0.1%，关于一台断定的造纸机从频率分辨率的视点来说，若能在最低速满意给定操控精度，则在高速工作是没有问题的。下面咱们举例说明：
设本台纸机在低速抄纸，变频器工作频率为10Hz，则请求给定精度为：10*0.1%=0.01Hz
所以请求变频器的频率分辨率有必要可以小于0.01Hz。
设本台纸机在高速抄纸，变频器工作频率为50Hz，则请求给定精度为：
50*0.1%=0.05Hz
所以请求变频器的频率分辨率有必要可以小于0.05Hz。
所以咱们在挑选传动体系时留意纸机低速时变频器能否满意操控精度的请求。而不用忧虑高速的给定精度。给定精度也可以经过变频器参数来进行调理，但缺陷是在改动作业状况时需要重新调整参数。
如一台用于流浆箱操控的上浆泵变频器，其工作频率通常在30~50Hz之间，操控选用SR73A调理器，可是流浆箱液位无法安稳，上浆量忽大忽小，变频器始终调理不能安稳。因素变频器设定分辨率不行。给定忽大忽小，1mA对应2.5Hz。咱们可以调理参数，变频器的最小给定为30Hz，即给定0mA对应30Hz，给定20mA对应50Hz，这样1mA对应1Hz，给定频率分辨率进步了2.5倍。
2、频率操控分辨率指变频器的输出最小分辨率，通常说变频器是无级调速是相对而言的。变频器有它的最小分辨率，每次调速频率的最小改变。如今变频器的最小分辨率通常为0.01Hz。用户在挑选变频器时应当留意频率分辨率是否能满意设备需要。
3、具有转差抵偿变频器对体系稳态精度的影响
沟通异步电机都存在转差频率，电机的输出转矩和功率与转差频率成正比，变频器为了进步速度操控精度，对电机操控选用转差抵偿。
根据异步电机的机械特性，当负载转矩增大，转差频率增大，转子发生速降。转差抵偿即是运用根据负载改动定子同步频率，以抵偿转子因为负载的速降，消除调速静差，从而确保转子的速度保持稳定。
变频器的转差抵偿根据电机的机械特性进行，变频器请求输入电机铭牌参数，根据铭牌参数来断定电机的操控数学模型，转差抵偿量应为：

因为电机在变频操控调速过程中，不一样公司的电机的阻抗不一样，所以转差抵偿在有时是欠抵偿，有时为过抵偿。因而对体系稳态、动态精度会有必定的影响。
所以在运用变频器的过程中合理运用转差抵偿会消除静差，进步体系的稳态精度。调理转差抵偿可以获得特别的机械特性，在板纸机、瓦楞纸机调试工作中非常重要。
4、变频器功用的基本请求
纸机对变频器功用的请求与挑选的上位操控体系有关，不一样的操控方法对变频器的功用有不一样的请求。纸机通常请求在操作台上可以对变频器进行起停、匍匐/工作、速度微调等操控操作；可以显现分部线速度、电机电流等功用；可以显现变频器作业状况等功用。
下面罗列在不一样的操控方法下对变频器的功用请求。
1、模仿操控与速度链操控器操控：
请求变频器有两路以上的模仿量输入和输出功用；两路以上的数字量输入功用；两路数字量输出功用。
两路模仿量输入用于速度给定和反应输入，第三路模仿量输入用于速度附加给定操控。两路模仿量输出一路用于显现分部线速度，一路用于显现变频器输出电流。两路以上的数字量输入用于起起停操控和匍匐/工作变换操控。两路数字量输出用于显现变频器的作业状况。
2、电动电位器操控方法：
请求变频器有两路模仿量输出功用；四路以上的数字量输入功用；两路数字量输出功用。
两路模仿量输出一路用于显现分部线速度，一路用于显现变频器输出电流。两路数字量输入用于起停操控和匍匐/工作变换操控；两路数字量用于速度微调操控。两路数字量输出用于显现变频器的作业状况。
3、plc通讯操控方法
PLC通讯操控方法按照操作方法分有两种操控方法，一种是选用传统的按钮操作方法，另一种为触摸屏操作方法。这两种操控方法请求变频器有通讯操控功用和对应的通讯适配器。如Modbus网络请求有Modbus通讯板；Profibus—DP总线请求有Profibus—DP通讯板。
（1）、按钮操控方法请求变频器有两路模仿量输出功用；两路的数字量输入功用；两路数字量输出功用。两路模仿量输出一路用于显现分部线速度，一路用于显现变频器输出电流。两路数字量输入用于起停操控和匍匐/工作变换操控；两路数字量输出用于显现变频器的作业状况。
（2）、触摸屏操控方法请求变频器有一路数字量输入，用于急停功用。其它显现操控都在触摸屏上进行。
5、结 语
该特一台造纸机能否正常工作并能使所生产出的商品满意客户的请求，不仅仅是技术一方面所能决议，其电气传动操控体系起了无足轻重的效果。因而，怎么挑选一套好的传动体系（即挑选一种此体系的中心装置—变频器）就显得尤为重要，文中为作者从事多年造纸传动体系规划有关作业的所得，供我们参阅。

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Motorola MVME3604-1151
Motorola MVME3604-5332
Motorola MVME3604-5342
Motorola MVME3604-5352
Motorola MVME3604-6342
Motorola MVME3604-6352
Motorola MVME372
Motorola MVME374
Motorola MVME374-1
Motorola MVME376
Motorola MVME385
Motorola MVME385-120
Motorola MVME393
Motorola MVME4604-1141 Dual 200MHz 64MB
Motorola MVME4604-5362 Dual 300MHz 256MB
Motorola MVME4604-5462
Dual 400MHz 256MB
Motorola MVME5100-0131
Motorola MVME5110-2251
Motorola MVME705-1
Motorola MVME705A
Motorola MVME705A
Motorola MVME705B











Motorola MVME710B
Motorola MVME712-104
Motorola MVME712M
Motorola MVME712M MVME712/M
Motorola MVME714
Motorola MVME719
Motorola MVME741
Motorola MVME742
Motorola MVME761-001
Motorola MVME761EXT
Motorola MVME785-MIC
Motorola MVME854TK 01-W2755D01C
Motorola MVME946
Motorola MVPI300
Motorola MVSB741
Motorola PMC-Span 01-W3298F01A
Motorola PPMC750-1231
Motorola PV5300B33
Motorola SMMXER3E100X0
Motorola SuperNode system with the following boards: 01-W1589B01C 01-W1590B01B 01-W1591B04L 01-W1644B04BB 01-W2844D01H 01-W2844D02H 01-W2845D03G 01-W2845D04G 01-W3896B01F
Motorola TMCP700-001
Motorola XR-342 XR342
Motorola XR712-121K
Motorola XR712-123TPK