diff --git a/hwe/scenario/scenario_911.json b/hwe/scenario/scenario_911.json
index 0769c626..591aff19 100644
--- a/hwe/scenario/scenario_911.json
+++ b/hwe/scenario/scenario_911.json
@@ -21,7 +21,8 @@
             ]
         },
         "incDefSettingChange": 10,
-        "maxDefSettingChange": 30
+        "maxDefSettingChange": 30,
+        "refreshLimitCoef": 20
     },
     "events":[
         [