广州昊永机电设备有限公司销售***：020-29881212谭小婉：13929578003传真：020-82526566商务***：1254825678地址：广州市黄埔区黄埔东路3618号南山商务大厦3楼308室公司网址：http://ABB软启动器ABB软启动器报价ABB软启动器调试ABB软启动器维修ABB软启说明书ABB软启选型ABB软启资料ABB***软启动器工作原理软启动器采用三相反并联晶闸管作为调压器，将其接入电源和电动机定子之间。这种电路如三相全控桥式整流电路，主电路图见图1。使用软启动器启动电动机时，晶闸管的输出电压逐渐增加，电动机逐渐加速，直到晶闸管全导通，电动机工作在额定电压的机械特性上，实现平滑启动，降低启动电流，避免启动过流跳闸。待电机达到额定转数时，启动过程结束，软启动器自动用旁路接触器取代已完成任务的晶闸管，为电动机正常运转提供额定电压，以降低晶闸管的热损耗，延长软启动器的使用寿命，提高其工作效率，又使电网避免了谐波污染。软启动器同时还提供软停车功能，软停车与软启动过程相反，电压逐渐降低，转数逐渐下降到零，避免自由停车引起的转矩冲击软启动器的选用（1）选型：目前市场上常见的软启动器有旁路型、无旁路型、节能型等。根据负载性质选择不同型号的软启动器。旁路型：在电动机达到额定转数时，用旁路接触器取代已完成任务的软启动器，降低晶闸管的热损耗，提高其工作效率。也可以用一台软启动器去启动多台电动机。无旁路型：晶闸管处于全导通状态，电动机工作于全压方式，忽略电压谐波分量，经常用于短时重复工作的电动机。节能型：当电动机负荷较轻时，软启动器自动降低施加于电动机定子上的电压，减少电动机电流励磁分量，提高电动机功率因数。（2）选规格：根据电动机的标称功率，电流负载性质选择启动器，一般软启动器容量稍大于电动机工作电流，还应考虑保护功能是否完备，例如：缺相保护、短路保护、过载保护、逆序保护、过压保护、欠压保护等。PST30-600-701SFA894002R7000PST37-600-701SFA894003R7000PST44-600-701SFA894004R7000PST50-600-701SFA894005R7000PST60-600-701SFA894006R7000PST72-600-701SFA894007R7000PST85-600-701SFA894008R7000PST105-600-701SFA894009R7000PST142-600-701SFA894010R7000PST175-600-701SFA894011R7000PST210-600-701SFA894012R7000PST250-600-701SFA894013R7000PST300-600-701SFA894014R7000PST30-690-701SFA895002R7000PST37-690-701SFA895003R7000PST44-690-701SFA895004R7000PST50-690-701SFA895005R7000PST60-690-701SFA895006R7000PST72-690-701SFA895007R7000PST85-690-701SFA895008R7000PST105-690-701SFA895009R7000PST142-690-701SFA895010R7000PST175-690-701SFA895011R7000PST210-690-701SFA895012R7000PST250-690-701SFA895013R7000PST300-690-701SFA895014R7000PSTB370-600-701SFA894015R7000PSTB470-600-701SFA894016R7000PSTB570-600-701SFA894017R7000PSTB720-600-701SFA894018R7000PSTB840-600-701SFA894019R7000PSTB1050-600-701SFA894020R7000PSTB370-690-701SFA895015R7000PSTB470-690-701SFA895016R7000PSTB570-690-701SFA895017R7000PSTB720-690-701SFA895018R7000PSTB840-690-701SFA895019R7000PSTB1050-690-701SFA895020R7000PST30-600-701SFA894002R7000PST37-600-701SFA894003R7000PST44-600-701SFA894004R7000PST50-600-701SFA894005R7000PST60-600-701SFA894006R7000PST72-600-701SFA894007R7000PST85-600-701SFA894008R7000PST105-600-701SFA894009R7000PST142-600-701SFA894010R7000PST175-600-701SFA894011R7000PST210-600-701SFA894012R7000PST250-600-701SFA894013R7000PST300-600-701SFA894014R7000PST30-690-701SFA895002R7000PST37-690-701SFA895003R7000PST44-690-701SFA895004R7000PST50-690-701SFA895005R7000PST60-690-701SFA895006R7000PST72-690-701SFA895007R7000PST85-690-701SFA895008R7000PST105-690-701SFA895009R7000PST142-690-701SFA895010R7000PST175-690-701SFA895011R7000PST210-690-701SFA895012R7000PST250-690-701SFA895013R7000PST300-690-701SFA895014R7000PSTB370-600-701SFA894015R7000PSTB470-600-701SFA894016R7000PSTB570-600-701SFA894017R7000PSTB720-600-701SFA894018R7000PSTB840-600-701SFA894019R7000PSTB1050-600-701SFA894020R7000PSTB370-690-701SFA895015R7000PSTB470-690-701SFA895016R7000PSTB570-690-701SFA895017R7000PSTB720-690-701SFA895018R7000PSTB840-690-701SFA895019R7000PSTB1050-690-701SFA895020R7000PST37-600-701SFA894003R7000PST44-600-701SFA894004R7000PST50-600-701SFA894005R7000PST60-600-701SFA894006R7000PST72-600-701SFA894007R7000PST85-600-701SFA894008R7000PST105-600-701SFA894009R7000PST142-600-701SFA894010R7000PST175-600-701SFA894011R7000PST210-600-701SFA894012R7000PST250-600-701SFA894013R7000PST300-600-701SFA894014R7000PST37-690-701SFA895003R7000PST44-690-701SFA895004R7000PST50-690-701SFA895005R7000PST60-690-701SFA895006R7000PST72-690-701SFA895007R7000PST85-690-701SFA895008R7000PST105-690-701SFA895009R7000PST142-690-701SFA895010R7000PST175-690-701SFA895011R7000PST210-690-701SFA895012R7000PST250-690-701SFA895013R7000PST300-690-701SFA895014R7000PSTB370-600-701SFA894015R7000PSTB470-600-701SFA894016R7000PSTB570-600-701SFA894017R7000PSTB720-600-701SFA894018R7000PSTB840-600-701SFA894019R7000PSTB1050-600-701SFA894020R7000PSTB370-690-701SFA895015R7000PSTB470-690-701SFA895016R7000PSTB570-690-701SFA895017R7000PSTB720-690-701SFA895018R7000PSTB840-690-701SFA895019R7000PSTB1050-690-701SFA895020R7000PST37-600-701SFA894003R7000PST44-600-701SFA894004R7000PST50-600-701SFA894005R7000PST60-600-701SFA894006R7000PST72-600-701SFA894007R7000PST85-600-701SFA894008R7000PST105-600-701SFA894009R7000PST142-600-701SFA894010R7000PST175-600-701SFA894011R7000PST210-600-701SFA894012R7000PST250-600-701SFA894013R7000PST300-600-701SFA894014R7000PST37-690-701SFA895003R7000PST44-690-701SFA895004R7000PST50-690-701SFA895005R7000PST60-690-701SFA895006R7000PST72-690-701SFA895007R7000PST85-690-701SFA895008R7000PST105-690-701SFA895009R7000PST142-690-701SFA895010R7000PST175-690-701SFA895011R7000PST210-690-701SFA895012R7000PST250-690-701SFA895013R7000PST300-690-701SFA895014R7000PSTB370-600-701SFA894015R7000PSTB470-600-701SFA894016R7000PSTB570-600-701SFA894017R7000PSTB720-600-701SFA894018R7000PSTB840-600-701SFA894019R7000PSTB1050-600-701SFA894020R7000PSTB370-690-701SFA895015R7000PSTB470-690-701SFA895016R7000PSTB570-690-701SFA895017R7000PSTB720-690-701SFA895018R7000PSTB840-690-701SFA895019R7000PSTB1050-690-701SFA895020R7000)