FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

OPERATION
11. SETTING AND DISPLAYING DATA
B–62764EN/01
748
Although the speedometer normally indicates the speed of the spindle
motor, it can also be used to indicate the speed of the spindle by setting
bit 6 (OPS) of parameter 3111 to 1.
The spindle speed to be displayed during operation monitoring is
calculated from the speed of the spindle motor (see the formula below).
The spindle speed can therefore be displayed, during operation
monitoring, even when no position coder is used. To display the correct
spindle speed, however, the maximum spindle speed for each gear
(spindle speed at each gear ratio when the spindle motor rotates at the
maximum speed) must be set in parameters No. 3741 to 3744.
The input of the clutch and gear signals for the first serial spindle is used
to determine the gear which is currently selected. Control the input of the
CTH1A and CTH2A signals according to the gear selection, by referring
to the table below.
(Formula for calculating the spindle speed to be displayed)
Spindle speed
displayed during =
operation monitoring
Speed of spindle motor
Maximum speed of
spindle motor
Maximum spindle
× speed with the
gear being used
The following table lists the correspondence between clutch and gear
selection signals CTH1A and CTH2A, used to determine the gear being
used, and parameters:
CTH1A CTH2A Parameter
0 0 =No.3741 (Maximum spindle speed with gear 1)
0 1 =No.3742 (Maximum spindle speed with gear 2)
1 0 =No.3743 (Maximum spindle speed with gear 3)
1 1 =No.3744 (Maximum spindle speed with gear 4)
The speed of the spindle motor and spindle can be displayed, during
operation monitoring, only for the first serial spindle and the spindle
switching axis for the first serial spindle. It cannot be displayed for the
second spindle.
On a color CRT, if the value of a load meter exceeds 100%, the bar graph
turns purple.
D Speedometer
D Color of graph

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