2 - Fagor Automation

i
Observe that a push-button (N.O., Normally Open) is included in parallel
with the limit switches for disabling (via PLC) the movement of the
axes of the machine in the opposite direction.
After activating the relay - KA1, its associated contact closes, to allow
supplying three-phase power to the system by pressing the ON button
closing the contactor - KM1. To remove power, press the OFF button.
Error reset
When an error appears at any drive, its "Drive OK" and, therefore, the
"System OK" contact of the power supply that feeds it will be open. The
relay - KA1 will be deactivated and its associated contact open and will
not be possible to supply power to the power supply until the cause of the
error is eliminated, as long as it is a non-resettable error.
Some of these errors (called non-resettable) may be eliminated by applying
24 V DC to the Error Reset pin of the power supply. See chapter
14 in the "dds-software" manual for further information on these errors.
The contact associated with the ON button resets the errors. This procedure
may close the "Drive OK" and "System OK" activating the - KA1 relay
and, while ON is still pressed, enable - KM1.
This circuit configuration joins the error reset and the system power-up
in a single push-button.
Activating the "System Speed Enable" of the power supply and the
"Speed Enable" of the drives
The "System Speed Enable" signal of the power supply is activated after
closing the contact KA2 with 24 V DC as a result of activating the relay -
KA2. Observe that KM1 has been closed earlier.
Now, the CNC may enable each axis (CNC Enable) and enable the
"Speed Enable" signal of each drive by means of relays - KA4, - KA5, -
KA6 and - KA7.
Activating the "Drive Enable" of the drives
Closing the contact associated with - KA2 excites the relay - KA3 with 24
V; this relay activates the "Drive Enable" signal of all the drive modules.
Observe that - KA3 is a delayed-deactivation relay where the desired
delay time t may be programmed. It may be used to keep contactor -
KM1 closed while braking a system for the necessary number of seconds
to give the power supply enough time to return the excess energy
to mains as long as the system has regenerative power supplies and it
is connected to mains (S1 closed) obviously. The delay time "t" to program
relay - KA3 must be slightly longer than the time it takes the system
to come to a full stop.
INFORMATION. In the diagrams provided later on, the green ON light indicates
that the "System Speed Enable" of the power supply is activated;
in other words, the "Speed Enable" in each drive related to it and the
SPENA signal of the CNC (sent to each drive via SERCOS or CAN) are
activated and there will then be motor torque (Drive Enable signal at each
drive and DRENA signal of the CNC). The red OFF light indicates that all
the previous signals are disabled.
Remember that a drive will only respond to an external velocity command
when the Drive Enable, Speed Enable and System Speed Enable
signals (besides the DRENA and SPENA signals of the CNC) are active
(24 V DC).
Connection diagrams
CONNECTION DIAGRAMS
Electrical cabinet. Diagrams 10.
DDS
HARDWARE
Ref.1209
333