Dwell For Dead Axes - Fagor CNC 8060 Installation Manual

2.5.17
2.
CNC 8060
CNC 8065
(R : 1709)
EF
·172·

Dwell for dead axes.

DWELL
Dwell for dead axes.
Parameter valid for linear and rotary axes and spindles.
Parameter valid for analog drive, Sercos and simulated.
Possible values: From 0 to 1000000 ms.
Default value: 0 (no dwell).
Associated variable: (V.)[ch].MPA.DWELL.xn
When an axis has a brake, for example very heavy vertical axes, it is only governed while
it is moving. When it is governed by the CNC (movements), it is referred to as being alive
and, when not moving (brake on), it is referred to as being "dead".
To bring it to "life", release the brake and close the position loop. The time required for this
operation must be defined by the DWELL parameter.
SERVOON
ENABLE
Velocity
Command
The ENABLE signal indicates to the PLC to let the axis move and the SERVOON signal
that the drive is ready.
The CNC waits the amount of time set in parameter DWELL before generating a movement
on the "dead" axis if it does not have the SERVOON signal active. Once the dwell has started,
the CNC will wait the time set in parameter DWELL before starting the movement, even if
the SERVOON signal has been activated before.
Special care must be taken with the delayed disconnection of the axis, when it becomes a
"dead" axis. If the SERVOON signal has been turned off and a new movement of the axis
begins, the CNC will not start timing but it could issue an error indicating that the axis is locked
up if as a result of disconnecting logically, the SERVOON signal ends up dropping.
On a tandem axis, both the master and slave axes must be enabled so they can be moved.
In this case, the CNC only applies the time set in DWELL to the SERVOON of the master
axis; if the enabling of the slave axis is slower, the PLC maneuver must verify that both axes
are enabled before generating the movement.
If an axis is going to work as a "dead" axis in a program with path joints, G5, G50 or HSC,
it will be necessary to enable the axis via PLC as "dead" axis (DEAD(axis) signal). This way,
the CNC knows at all times that it will have to apply a dwell before every movement of that
axis.
DWELL
I n s ta ll a t io n ma n u a l.