diff --git a/scripts/speed_controller.py b/scripts/speed_controller.py
index 2ab0030..596ea39 100644
--- a/scripts/speed_controller.py
+++ b/scripts/speed_controller.py
@@ -74,7 +74,7 @@ def rpm_control():
 
     #slow down rotating if over maximum
     if actual_rpm > float(get_variable(variable_max_rpm)):
-        set_output(actual_set_U - 1)
+        set_output(actual_set_U - 0.1)
         print("max_rpm_reached")
         return
     
@@ -83,6 +83,11 @@ def rpm_control():
         print("control_set: 0")
         return
     
+    if actual_set_U > float(get_variable(variable_max_U)):
+        set_output(float(get_variable(variable_max_U)))
+        print("Maximum out voltage")
+        return
+    
     #algorithm for RPM control
     if (requested_rpm - float(get_variable(variable_control_step_rpm))) > actual_rpm:
         set_output(actual_set_U + float(get_variable(variable_control_step_U)))