You need to program a “square wave” into the acceleration. The sign of the acceleration has to change over 0.001 s or smaller.
0.000 -9806.
Step 1 0.050 -9806.
Step 3 0.051 +9806.
Step 4 0.100 +9806.
Step 5 0.101 -9806.
Step 6 0.150 -9806.
Step 7 0.151 +9806.
Step 8 0.200 +9806.