1734-EXT1

1734-EXT1

1734-EXT1

1734-EXT1

 1. 用EV3500变频器与变频电机配套使用替代高压电机(因为高压电机驱动氧枪高压供水泵控制水压和扬程准确度不高)。 
  2. 提高工作效率，节能，实现无人看守，上位机操作控制。 
  3. 日常操作简单，维护方便。 
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  现场配置要求： 
  变频器： EV3500-4T4000P 4台 
  变频电机：355KW 4台 绝缘等级：B级 
  辅助传动是由一台S7-400PLC并配置1台ET200远程I/O子站实现 
  系统配置为3用1备，采用SM-PROFIBUS-DP总线方式控制，无论机旁还是自动都经过上位机进行控制，操作方便简单。 

  二．总体方案确定： 
  EV3500变频器在实际应用中对泵类负荷的控制方式有很多种，并且都能满足工艺的要求。 
  1. 开关量控制。 
  2. 模拟量控制。 
  3. 总线通讯控制等其它控制方式。 
  开关量控制容易导致误操作并且增加操作工的工作强度。 
  考虑到主控室与变频器机柜距离远，模拟量控制会受距离限制和强电干扰而会产生衰减，增加设备之间的故障接点，不便于设备维护。 
  采用SM-PROFIBUS-DP通讯控制可以弥补以上2种控制方式的缺点，实现无人看守操作，控制线路维护简单方便，仅采用1根2芯的DP电缆就满足对EV3500变频器的起停控制，变频器运行状态的反馈，远程故障复位等其它要求，并且充分利用EV3500通讯上的强大优势。 

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