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8-30
Chapter 8 SXYX
5-3-2 Adjusting the R-axis belt tension (ZRS)
With the ZRS model, a timing belt is used for the R-axis.
If the timing belt tension is week, adjust the belt tension with the following pro-
cedures.
WARNING
There is a risk of injury if fingers, etc., are caught between the drive sec-
tion pulley and belt section. Always turn the controller power OFF and
carefully carry out the work if these parts may be contacted.
!
CAUTION
The position will deviate when the belt tension is adjusted.
Carry out absolute reset, and reset the basic coordinates and point data.
Push-pull scale
Deflection
Deflection
Load
Pulley
Pulley
Belt
Fig. 8-27 Adjusting the belt tension
1) Turn the controller power OFF.
2) Place a sign indicating "Work In Progress" so that other operators do not turn
the controller power ON.
3) Remove the cover. (M4, 6 screws)
4) The following work must be carried out by two operators.
One operator must apply a vertical load on the center of the belt with the
push-pull scale, and the other operator must measure the belt deflection at
that time.
5) If the measured value is within the range shown below, there is no need for
adjustment. Adjust with the following procedure if the measured value is not
within the range.
Table 8-1
Load
Deflection amount
4.4 to 4.8N ( 0.45 to 0.49kgf )
2mm
6) Loosen the M4 bolt q (three positions) shown in Fig. 8-28.