diff --git a/script/RFscan/phase_scan_caqtdm.py b/script/RFscan/phase_scan_caqtdm.py
index d6f9b41..87a15b2 100644
--- a/script/RFscan/phase_scan_caqtdm.py
+++ b/script/RFscan/phase_scan_caqtdm.py
@@ -16,8 +16,8 @@ disp    = caget(bpm_ch  + ":DISPERSION")
 energy0 = caget(bpm_ch  + ":ENERGY")
 
 phase =  ControlledVariable("Phase", station + "-RSYS:SET-VSUM-PHASE", station + "-RSYS:SET-VSUM-PHASE")
-phase.config.minValue   =-45.0
-phase.config.maxValue   = 360.0
+phase.config.minValue   =-180.0
+phase.config.maxValue   = 180.0
 phase.config.resolution = 0.5
 phase.initialize()