Fagor DDS Series Hardware Manual page 335

10.8 Electrical cabinet. Diagrams
DANGER.
The diagrams of this chapter do not meet
the European Machinery Directive 2006/42/EC.
Complying with the European Machinery Directive usually requires PL d or
SIL 2 (milling machines and lathes). The AXD/SPD reaches PL d or SIL 2
(see models in the Declaration of Conformity). An external safety controller
PL d or SIL 2 is necessary as well as bearing in mind the concepts in chapter
9. FUNCTIONAL SAFETY .
Before showing the diagrams of the electrical cabinet, described later on,
read this brief explanation of the actions followed by the modules on system
start-up. All the references to electrical devices, for example to the switch -
S1, power contactor - KM1, relay - KA3 appear in later diagrams. Consult
these diagrams to interpret the explanatory texts.
Voltage for control circuits
 Power with 24 V the internal control circuits of each modular drive
through the power supply module or of each compact drive through its
integrated power supply, closing the main power switch or main key - S1.
Refer to the diagrams shown later to locate - S1 in the system.
Internally, each module checks its hardware and configuration.
If the status of each drive is OK and no errors have occurred, each drive
closes its DR.OK contact.
If the status of all the drives that make up the DDS system is correct and
no errors have occurred, each one of them lets the power supply know
through the internal bus (only the modular drives). If the power supply
does not register any errors either, it closes its "System OK" contact.
The power supply then starts charging the power bus with a "Soft-Start".
 Activate the control input "Speed Enable" of each drive and the "System
Speed Enable" input of the power supply - see the location of the relay -
KA2 in the diagrams. The CNC, in turns, enables the SPENA mark.
 Activate the control input "Drive Enable" of each drive - see the location
of the relay - KA3 in the diagrams. The CNC, in turns, enables the
DRENA mark.
NOTE. The motor is now ready to follow the velocity command given by
the CNC.
All the following diagrams for power and control circuits in the electrical
cabinet described in this chapter are only orientation purposes for the
technician designing the machine and they may be further completed or
simplified at will according to each application.
Emergency line
The purpose of relay - KA1 is to confirm that the system is in running
condition both mechanically and electrically. This relay closes its contact
when all and each of the following conditions are met:
 The System_OK contact of the power supply is closed.
 No emergency has been activated.
 The spindle motor temperature is correct (it does not overheat) and
 none of the axes of the machine has reached its limit switch.
NOTE. Observe that a push-button (N.O., N ormally O pen) 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.
   Connection diagrams
10.
DDS
HARDWARE
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