diff --git a/site_ansto/instrument/sans/config/anticollider/acscript.txt b/site_ansto/instrument/sans/config/anticollider/acscript.txt
index 301aa3b7..0c444e85 100644
--- a/site_ansto/instrument/sans/config/anticollider/acscript.txt
+++ b/site_ansto/instrument/sans/config/anticollider/acscript.txt
@@ -1,3 +1,3 @@
 # Forbid detector motion when the detector voltage is on
-forbid {-inf inf} for det    when dhv1 in {20 inf}
-forbid {-inf inf} for detoff when dhv1 in {20 inf}
+forbid {-inf inf} for det    when dhv1 in {800 inf}
+forbid {-inf inf} for detoff when dhv1 in {800 inf}