HUST CNC H6D-T Manual
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349. The direction that servo motor search the Grid when W-axis going back to
HOME.
Format (Default=0)
EX:
When MCM#341= 0, the 2
nd
and 3
rd
direction is the same with 1
st
MCM#341= 1, the 2
nd
is the same with 1
st
.
MCM#341= 128, the 2nd direction is opposite to 1st .
MCM#341= 256, the 2nd and 3rd direction is opposite to 1st .
Set the moving speed when the tool, after having touched the HOME limit switch,
is searching for the encoder grid signal during HOME execution. HUST H6D/
H9D CNC has three (3) different speeds when you execute HOME function as
shown by Fig 7.2.
Speed 1: The motor accelerates to Speed 1 and its maximum speed is
determined by the settings of MCM #301 ~ #309, (X, Y, Z, A, B, C, U,
V, W-axis) and the direction by MCM #281 ~ #289. When tool
touches the home limit switch, it starts deceleration to a stop.
Speed 2: The motor accelerates again to speed 2 and its maximum speed is
equal to 1/4 of Speed 1 and the direction is by MCM #341~#349.
When tool starts leaving the home limit switch, it starts deceleration to
a stop.
Speed 3: The motor accelerates to speed 3 and its maximum speed is
determined by the settings of MCM #321~#329 and the direction by
MCM #341~#349. Once the encoder grid index is found, motor
decelerates to a stop. This is the HOME position.
Note that the length of the Home limit switch should be longer than the distance
for the deceleration of Speed 1. Otherwise, serious error may result. The equation
to calculate the length of the Home limit switch is
Length of Home Limit Switch (mm)
FDCOM *ACC
60000
FDCOM = Speed 1, in mm/min. (MCM #301~ #309)
ACC = Time for acceleration/deceleration, in ms. (MCM #505)
60000 = 60 seconds = 60 * 1000 milliseconds
When the C-bit C063=1 in PLC program, it commands the controller to do
homing operation. Do homing operation for X-axis if R232=1, do Y-axis if
R232=2, do Z –axis if R232=4 , do A–axis if R232=8 and do four axes
simultaneously if R232=15.
Ex: FDCOM = 3000.00 mm/min, and ACC = 100 ms
Length of Home Limit Switch = 3000 * 100 / 60000 = 5 mm
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