diff --git a/detection/src/main/java/com/njcn/gather/detection/handler/SocketFreqConverterDevService.java b/detection/src/main/java/com/njcn/gather/detection/handler/SocketFreqConverterDevService.java
index a238a52b..38c8a9bb 100644
--- a/detection/src/main/java/com/njcn/gather/detection/handler/SocketFreqConverterDevService.java
+++ b/detection/src/main/java/com/njcn/gather/detection/handler/SocketFreqConverterDevService.java
@@ -370,6 +370,7 @@ public class SocketFreqConverterDevService {
         String freqConverterTag = currentUserId + CnSocketUtil.FREQ_CONVERTER_TAG;
         // 避免过早把 freqConverterTableSuffix 等全局值清掉，造成变频器无法使用全局变量
         if (!SocketManager.isChannelActive(freqConverterTag)) {
+            FormalTestManager.freqConverterStep = null;
             FormalTestManager.clearFreqConverterRuntimeState();
         }
     }
diff --git a/detection/src/main/java/com/njcn/gather/detection/handler/SocketFreqConverterService.java b/detection/src/main/java/com/njcn/gather/detection/handler/SocketFreqConverterService.java
index c39c9144..03155e10 100644
--- a/detection/src/main/java/com/njcn/gather/detection/handler/SocketFreqConverterService.java
+++ b/detection/src/main/java/com/njcn/gather/detection/handler/SocketFreqConverterService.java
@@ -284,6 +284,7 @@ public class SocketFreqConverterService {
         String devTag = currentUserId + CnSocketUtil.DEV_TAG;
         // 避免过早把 freqConverterTableSuffix 等全局值清掉，造成设备无法使用全局变量
         if (!SocketManager.isChannelActive(devTag)) {
+            FormalTestManager.freqConverterDevStep = null;
             FormalTestManager.clearFreqConverterRuntimeState();
         }
     }
diff --git a/detection/src/main/java/com/njcn/gather/detection/util/socket/FormalTestManager.java b/detection/src/main/java/com/njcn/gather/detection/util/socket/FormalTestManager.java
index e773b619..bc51a626 100644
--- a/detection/src/main/java/com/njcn/gather/detection/util/socket/FormalTestManager.java
+++ b/detection/src/main/java/com/njcn/gather/detection/util/socket/FormalTestManager.java
@@ -230,8 +230,6 @@ public class FormalTestManager {
      * 清理变频器耐受实验运行态数据
      */
     public static void clearFreqConverterRuntimeState() {
-        freqConverterStep = null;
-        freqConverterDevStep = null;
         currentFreqConverterId = null;
         freqConverterTableSuffix = null;
         pendingDipTaskMap.clear();