Veichi Electric AC60 series Manual page 114

In three linear control operation, "SB1"is stop button which is usually
connected, "SB2" is running button which is usually disconnected, both
"SB1"and "SB2"are valid at pulse edges; "K" is the operation direction
selection button; "D (X)" is
defined as the terminals of the three-linears operational control (11)
function.
F-09 1 step speed
setting 1X
F-10 2 step speed
setting 2X
the multi-function terminal; (X1 - X6) are
Range ：0.00Hz～upper limit
frequency
Range ：0.00Hz～upper limit
frequency
110
Factory
setting： 20.00Hz
Factory
setting：10.0Hz