Yaskawa YASNAC PC NC Connecting Manual - Manual (Page 63)

5 - 4
YASNAC PCNC Connecting Manual Chapter 5: Connection of Power ON/OFF Excluisve Signal
5.3 Details of signals
This section describes the signals used in the power supply sequence.
5.3.1 Servo Power ON (SVMX) and Brake Release (BKX) Outpu t
(1) Signal Names and Descriptions
SVMX:This output signal is closed when we press Power ON button after PCNC boots
up. The PLC starts working as soon as PCNC boots up. Use SVMX to turn ON the
main Contactor MC or (1MC) to feed main power to the Servo Pack.
BKX: This is the output to release the holding brake of the feed axis (vertical axis).
(2) Power Supply Sequence
Power supply sequence is executed as shown below:
a. Turn ON the power to the PCNC controller and I/O Power (DC 24V) simultaneously.
Power will be supplied to JCNC-JFC10 CNC board from the ISA bus of the PC.
PCNC will start booting up.
b. When the PCNC boots up, perform the Servo ON operation ( “closed”between EON
and ECOM ). SVMX output is closed and the servo power is turned ON.
c. After completion of servo ready (servo clamp status), BKX output is closed after the
time set by parameter. For the motor equipped with a brake, release the brake by this
signal.
d. After SVMX output is closed and the controller is ready, if external preparation has
been completed, close the MRD (machine ready completed) input of the general
purpose output module. Now Alarm lamp icon on the PCNC CRT is green and
operation is now possible.
.