diff --git a/script/test-move-mono.py b/script/test-move-mono.py
index 88fe126f..6127b085 100644
--- a/script/test-move-mono.py
+++ b/script/test-move-mono.py
@@ -1,6 +1,6 @@
 #MonoEnergy.write(110.0)
 
-Eph.write(600.0)
+Eph.write(500.0)
 while not Eph.isReady():
     time.sleep(10);
 print("DONE")