输送系统广泛应用于制造业以及仓储管理和材料管理。大量的循环和平稳运行需要大量的传感器技术,从保护生产过程和人员的安全传感器,到识别系统和物体检测技术,再到用于测量物体距离或体积的传感器。尽管用于这些目的的测量设备各不相同,但它们至少有三个共同点:需要12–24 V电源,仅在输送系统运行时需要,并且缺少传统的开关。
面对数百个RFID系统、光电安全传感器、光学识别传感器,手动开启和关闭并不可取。这些负载通过其电源成股切换。当最后一班结束或周末即将到来时,传送系统将关闭,并随之关闭传感器所需的电源装置。然而,如果传送或运输系统只闲置一两个小时,通常的只是确保安全,将定位或识别系统通电。
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一个有环保意识的公司
这种方法虽然方便,但已成为一些公司面临的一个棘手问题:“我们在日本的一个大客户在多个地点运营大量的传送系统,”Wago日本区域销售经理Yasunobu Ohta说。“每天一次,他们在一个小时的午休时间停止生产;传送带闲置,但他们继续为传感器供电。管理层认为这是一个节约能源的机会。“
在内部优化方案中收集了一些想法,并很快明确了辅助传感器关闭过程必须与输送机系统的主开关相结合:“手动关闭每个20–24 V电源单元,然后在中断后逐个重新开启,这种做法的效率非常低下,” Ohta继续说道。终于,他们借助Wago的Pro 2电源,找到一个优雅的解决方案。这款智能电源装置具有数字输入和输出,既可以将其置于待机模式,也可以将其重新投入运行。
为每个人提供自动叫醒服务
当耦合控制器检测到传送机进入手动停止时,连接的Pro 2通过DO信号进入待机模式。由于此信号可以发送到级联的其他电源,因此控制器不需要单独连接到每个电源单元;DO信号在PRO 2之间传递。“当主开关用于停止传送机时,所有24 V电源自动进入待机模式,一旦系统再次运行,它们都会重新打开,” Ohta说。智能WAGO电源的可配置开启延迟用于防止所有直流电源单元同时开启并导致负载峰值。
由于中央交换机和输送系统之间的耦合,工作人员无需考虑后续步骤。这可防止由于传感器系统重启意外故障而导致的安全违规和生产中断。因此,该解决方案不仅提供了可观的节能潜力,而且还提供了优异的用户友好性。
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满足节能要求
该应用易于实施,而且在许多公司中,它可以实现比初始印象更大的节能效果:“由于有许多不同的传感器,节能程度取决于具体的系统,” Ohta解释说。他继续说道:“有些传感器耗电只有几毫安,而另一些则需要几百毫安。但无论如何,所使用的大量系统都会产生显著的节能潜力。
我们来看一个计算示例。如果100台装置的平均电流为100 mA,并且采用24 V供电,则一小时的工作需要240 Wh的能量。260个工作日,总计62.4 kWh/a. 如果使用800 mA而不是100 mA,则每年的能源输入量仅不到500 kWh ——这是一个不费吹灰之力就可以实现的节能量。
大量看似微不足道的措施,累加在一起也可以实现大量节能,从而大幅减少碳排放。无论如何,既为公司省钱又保护环境的解决方案总是受欢迎的。有时候,所需的只是一个想法和恰当的技术,例如,WAGO Pro 2电源。