GSK 980TDi, Руководство пользователя

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Chapter 4 Machine Debugging methods and Modes
485
Ⅲ
Connection
movement direction is inconsistent with the one of command required.
The manual movement direction can be changed by the Bit 4, Bit 3, Bit 2, Bit 1 and Bit 0 (5VAL,
4VAL, YVAL, ZVAL or XVAL separately corresponds to the 5
th
, 4
th
, Y, Z or X axis movement button) of
parameter No.175.
4.3 Gear Ratio Adjustment
№ 015
～
№ 016 can be modified for electronic gear ratio adjustment to meet the various
mechanical transmission ratios when the machine travel distance is not consistent with the
displacement distance displayed by the CNC.
Formula:
D
M
Z
Z
L
C
CMD
CMR
*
* * 4
δ
=
CMR: Code multiplier coefficient (data parameter No.015)
CMD: Code frequency division coefficient (data parameter No.016)
C: Motor’ s encoder lines
α
: Pulse volume, motor rotation angle for a pulse
L: Screw lead
δ : Current min. input code unit of CNC
ZM : gear teeth number of lead screw
ZD: gear teeth number of motor
For example, the screw lead and motor are directly connected by linkage axis, the motor’s
encoder is 17-bit absolute one, screw lead is 4mm, the current increment of CNC is 0.1 μ ;
X electronic gear ratio:
625
1024
1
1
*
4
0.00005 * 131072
Z
Z
*
L
δ C*
CMD
CMR
D
M
= = =
Z electronic gear ratio:
625
2048
1
1
*
4
0.0001 * 131072
Z
Z
*
L
δ C*
CMD
CMR
D
M
= = =
Then, the parameter data № 015X
（
CMRX
）
=1024
，
№ 016X
（
CMDX
）
=625
；
№ 015Z
（
CMRZ
）
=2048 ， № 016Z （ CMDZ ） =625 。
If the electronic gear ratio numerator is more than the denominator, the allowed CNC max. speed
will decrease. For example: the data parameter No.015Z (CMRZ) =2, No.016Z (CMDZ) =1, so the
allowed Z axis max. speed is 30000mm/min.
If the electronic gear ratio numerator is not equal to the denominator, the allowed CNC
positioning precision may decrease. For example: the data parameter No.015Z(CMRZ) =1,
No.016Z(CMDZ) =5, so the pulse is not output as the input increment is 0.0004, but a pulse is output
when the input increment is 0.0005.
In order to ensure the CNC positioning precision and speed index, it is suggested that the CNC
electronic gear ratio is set to 1:1 and the electronic gear ratio calculated is set to the digital servo
when matching with digital servo.
When matching with the step drive, choose the drive unit with step division function as possible
as it can, and properly select mechanical transmission ratio. The 1:1 electronic gear ratio should be
ensured to avoid the excessive difference between the numerator and the denominator of this CNC
electronic gear ratio.