风机、水泵与冷却装置

  • 风扇

    Danfoss 变频器的用户界面简单易用,有分布式智能功能,可减少电能消耗,优化风扇性能。

    提升舒适度,减少耗能

    VLT® HVAC Drive 和 VLT® Refrigeration Drive 将速度压力传感器值转换为流量值,可根据固定流量或固定流量差进行设置。既提升舒适度又节能。为了进一步提升舒适度,可设置与风扇连接的变频器以避免频带产生共振损坏通风系统。

    扩大建筑物管理系统容量

    通过将变频器集成于建筑物管理网络中,所有 HVAC 变频器 I/O 点均可用作扩大控制器容量的远程 I/O。例如,可直接将室温传感器 (Pt1000/Ni1000) 连接至系统。 

    提高空气处理性能

    VLT HVAC Drive 和 VLT Refrigeration Drive 内置智能逻辑控制和四个自动调谐控制器,通过风扇、阀门和阻尼器控制空气处理功能。省去建筑物管理系统的直接数字控制器,节省了宝贵的数据点,降低空气处理成本。

    VLT HVAC Drive 能够处理传感器的逻辑规则与输入、实时功能和与时间相关的操作。因此变频器可以控制各种功能:

    • 周末与工作日安排
    • 用于温度控制的串级 P-PI
    • 新鲜空气与出气之间流量均衡
    • 传送带检测–变频器可以从电流和速度的关系中对断裂的皮带作出可靠判断。立即检测到空气流量不足,便于采取措施减少费用和停机时间

    Danfoss 变频器带有多泵专用控制功能和智能保护功能,可优化生产、保护系统的变频器、电动机和设备。当管道泄漏或断裂时,仍能确保供应液体。专用功能包括:

    两步斜坡加减速

    泵很快达到最低转速,给系统加料,对阀门无压力。

    流量补偿

    流动阻力取决于流速。为了节约能源,在需要低流量时交流变频器把压力降低。

    PI 控制器自动调谐

    变频器记录监视系统对其所做的纠正做出反应,然后计算不断优化的 P 值和 I 值,以便快速实现精确稳定的运行。

    电动机轮换

    该内置逻辑控制两个水泵在使用/备用状态之间切换。备用泵运转可防止一直只使用一个水泵。内部定时器确保平均使用各个泵。

    能量优化

    能量自动优化等功能确保电动机的最优磁化作用。

    总线控制

    自动化意味着减少浪费,优化过程控制。Danfoss 交流变频器控制该行业最常见的总线协议并无缝集成至总控制系统。

    减少磨损

    嵌入式多泵控制器对所有泵平均分配运行时间。这能尽可能减少各个泵的磨损,实现最佳预测维修计划,延长泵的使用寿命。

    防止过载

    减低变频器转速,确保低流量供应。

    空泵保护

    如井已干涸或管道泄漏,交流变频器能检测到泵在实际压力小于所需压力的状态下运行。然后变频器会启动报警或者执行其他预先设置的操作。

    无流量/低流量

    如果水循环停止,泵在干涸或管道泄漏的状态下运行,交流变频器会检测到泵正快速运行但完全满载。变频器相应补偿给泵供应的电力。

    智能化的散热管理

    背部风道冷却系统把 90% 的热量散到控制室外。这减少了控制室空气调节所需的能量,减少面板门所需要的风扇,节约成本。

    冷却装置

    冷却装置的变速控制有助于您根据系统中的测量值以及实际需要和能力进行定压调节。空气压缩机长期部分负荷运行时就需要速度控制。设备以低速运行,从而节约能源,降低运行成本。通过优化系统和压缩机本身降低安装成本。

    Danfoss 交流变频器可减少启动和停止次数,减少机械磨损。“跳过共振”功能等专用功能有助于您轻松确定变频器频率以防止产生噪音和损坏。

    用于压缩机的产品包括:软启动器、大功率变频器、内置多泵控制器选件的 AHF 谐波滤波器、直流线圈和 PID 控制器。

    启动和峰值负荷策略

    启动是压缩机运行的重要阶段。VLT Refrigeration Drive 通过变换压缩机速度在运行过程中调整其容量,从而将需要的启动和停止次数降至最低。给定期间的启动/停止循环的最大次数可使用控制面板进行配置。

    135% 启动转矩

    VLT Refrigeration Drive 可提供 135% 的额定启动转矩并持续 30 秒钟。在正常运行中,将提供 110% 的额定转矩并持续 60 秒。

    空载启动

    为进一步延长变频器的使用寿命,可打开一个减压阀以便压缩机在无负载的情况下快速启动。

    具有相同峰值负载的更小压缩机

    系统配置小型压缩机可处理短暂峰值负荷,变频器以 90 Hz 运行。通过这种方式,无需为处理短暂峰值负载而配置大型压缩机。

    中性区

    当变速压缩机出现故障时,VLT Refrigeration Drive 继续控制恒速压缩机。中性区处于由特殊参数“恒速中性区”设置的故障状况,这样,就可以通过扩展中性区来减少启动次数。

    优化功能

    P0 优化

    The VLT Refrigeration Drive 支持连接 ADAP-KOOL® LonWorks 控制以实现 P0 优化。

    昼/夜控制

    根据昼夜负荷调整压缩机给定值和蒸发器风扇速度时间表、避免多余的能耗。

    冷凝最终温度监视

    通过温度传感器监测浮动磁头高压控制,在高压达到临界值前减速。 

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