变频器上电正常，带载运行跳UV的原因

<p><span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, &quot;PingFang SC&quot;, &quot;Microsoft YaHei&quot;, &quot;Source Han Sans SC&quot;, &quot;Noto Sans CJK SC&quot;, &quot;WenQuanYi Micro Hei&quot;, sans-serif; font-size: 13.3333px; white-space: pre-wrap; caret-color: rgb(30, 111, 255); background-color: rgb(255, 255, 255);">1、原因是直流接触器未吸合或接触不良造成的，先检查接触器是否完好。 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 2、如果接触器没问题有很大原因是开关电源的问题。 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3、以上没问题的话，有可能是风扇短路拉低了开关电源电压造成。</span></p>