diff --git a/site_ansto/instrument/sans/config/velsel/sct_velsel.tcl b/site_ansto/instrument/sans/config/velsel/sct_velsel.tcl
index 6ecea765..06a176a7 100644
--- a/site_ansto/instrument/sans/config/velsel/sct_velsel.tcl
+++ b/site_ansto/instrument/sans/config/velsel/sct_velsel.tcl
@@ -297,10 +297,10 @@ proc rdPwdAck {} {
 
     set angle [lindex [hval $statuspath] $paramindex(ttang) end]
     set aspeed [lindex [hval $statuspath] $paramindex(aspeed) end]
-    if {$aspeed >= 3100} {
+    if {$aspeed >= 800} {
       set lambda [AngleSpeedToWavelength $angle $aspeed]
     } else {
-      set lambda 99999
+      set lambda 9999
     }
     if {$lambda != [sct oldval]} {
       sct oldval $lambda