diff --git a/controllers/include/cm510_cfg.h b/controllers/include/cm510_cfg.h
index 54775760f91b5cbe79d46f74d6f9c4660d71a6be..c15aa91cacb52e87578b0cff12cf3112847c88eb 100644
--- a/controllers/include/cm510_cfg.h
+++ b/controllers/include/cm510_cfg.h
@@ -6,7 +6,7 @@
 // controller configuration parameters
 #define ADC_MAX_NUM_SAMPLES                     16
 #define ADC_SAMPLE_PERIOD_MS                    40
-#define ADC_VOLTAGE_ALARM_TH                    559
+#define ADC_VOLTAGE_ALARM_TH                    450 
 #define ADC_VOLTAGE_ALARM_WINDOW                20
 #define ADC_VOLTAGE_ALARM_NOTE                  NOTE_LA
 #define ADC_VOLTAGE_ALARM_TIME_ON               30
diff --git a/controllers/include/cont_cfg.h b/controllers/include/cont_cfg.h
index 985b7b9a4e2abfc84c834cdcba1f249ac229ad84..bbb7e6a4ac9e494cd976dcb6bac54c014761a341 100644
--- a/controllers/include/cont_cfg.h
+++ b/controllers/include/cont_cfg.h
@@ -13,7 +13,7 @@
 #endif 
 
 #ifndef ADC_VOLTAGE_ALARM_TH
-  #define ADC_VOLTAGE_ALARM_TH        559
+  #define ADC_VOLTAGE_ALARM_TH        450
 #endif
 
 #ifndef ADC_VOLTAGE_ALARM_WINDOW