TOMATECH AUTOMATION
again.
And CNC begins to detect the encoder one-turn signal (PC), if this signal level skips, the
motion will be halted. And the corresponding zero return indicator on the operator panel
lights up for machine zero return completion.
When the BIT0 (ZMX) of the bit parameter No.006 are both set to 1, and the BIT5(DECI)
of the
bit parameter No.004 is set to 0, it chooses the machine zero return mode C, and the
deceleration
signal low level is active.
So the sequence of machine zero return mode C is shown as follows:
Reversely
Decelerates
to stop
Time(
t)
Return
finish
Low return
speed
High return speed
Velocity(v)
nPC
Zero return speed
Deceleration switch
Fig. 2-41-b
336
Ⅲ Connection
Return process of machine zero mode C
A: Select Machine zero mode, press the manual positive or negative feed key (return
direction
set by bit parameter No.183), the corresponding axis moves to the machine zero by a
rapid
traverse speed (No.113). As the axis press down the deceleration switch to cut off
deceleration signal, the feeding keeps rapid rate and depart from the deceleration switch,
when the DEC signal contact is closed, the feeding slows down to zero, then run reversely
to
return to machine zero in a low speed.
B: In the reverse running, it presses down the deceleration switch to cut off the DEC signal
contact and continues returning; as it departs from the deceleration switch, the
deceleration
signal contact is closed again. And CNC begins to detect the encoder one-turn signal (PC),
if
this signal level skips, the motion will be halted. And the corresponding axis zero return
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