
B-63943EN-1/02 1.AXIS CONTROL
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For details of these functions, refer to FFANUC AC SERVO MOTOR
αis/αi series PARAMETER MANUAL (B-65270EN).
- Notes on stability of tandem control
An important factor affecting stability in tandem control is the
capability of back feed. Back feed is to cause movement along either
the master or slave axis from the other axis, via the transmission
mechanism connecting the two axes. A machine without this
capability may be inclined to become unstable and require
adjustments.
- Connection of axis signals
The DI/DO signals, generally connected to each axis, must be
connected only to the master axis of two axes of tandem control. The
signals need not be connected to the slave axis. The following signals,
however, may have to be connected depending on the application.
i) Controlled axis detach signal and servo off signal
Connect these signals so that the master and slave axis signals are
simultaneously input.
ii) Overtravel limit signal
Connect the signal so that 1 is always output as the overtravel
limit signal for the slave axis.
If the slave axis stroke limit must also be detected, connect the signals
so that the signal detected on the slave axis is sent to the overtravel
limit signal of the master axis.
- Connecting motors
Connect the motors according to the servo axis numbers. Connect the
feedback cable of the slave axis.
(Sample connection for position feedback cable)
xis
control
JF1
JF2
JF21
Feedback cable for motor of master axis
Feedback cable for motor of slave axis
dapter for separate
detector
Feedback cable for separate detector
- Servo alarms
Motor overload and other servo alarms are displayed separately for the
master and slave axes.