Add set libera ref to zero

DG_PY_FOFBLegacy.py

@@ -616,6 +616,9 @@ class DG_PY_FOFBLegacy(Device):
 
             self.StopToZero()
             self.prx_fofbcommand.StartSteerers()
+            self.zeroRefLibera()
+
+            time.sleep(4)
 
             self.HotStart()
 
@@ -734,7 +737,6 @@ class DG_PY_FOFBLegacy(Device):
         try:
             self.prx_fofbmanager.xreforbit = np.zeros(122)
             self.prx_fofbmanager.zreforbit = np.zeros(122)
-            time.sleep(1)
             self.prx_fofbmanager.StartStep04LoadXRefOrbit()
             self.prx_fofbmanager.StartStep05LoadZRefOrbit()
         except Exception as e: