
4. CONFIRMATION OF
B-65165E/02 START-UP PROCEDURE THE OPERATION
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4.2.3 VRDY-OFF Alarm Indicated on the CNC Screen
When the VRDY-OFF alarm is indicated on the CNC, check the items
listed below. In addition to these causes, there are other possible
causes of VRDY-OFF. If the problem still exists after the following
items are checked, contact your FANUC service representative.
(1) Interface between modules
(a) Is a terminating dummy connector for the interface between
modules (JX1A, JX1B) attached to JX1B of the module (an
SVM or SPM) at the end of the connection chain?
(2) Emergency stop signal (ESP)
(a) Has the emergency stop signal (connector: CX4) applied to
the PSM been released? Alternatively, is the signal
connected correctly?
(b) Is the emergency stop signal line (pin 3 of connectors CX2A
and CX2B) between the PSM and SVM or SPM connected
correctly?
(3) MCON signal
(a) Has the ready command signal MCON been sent from the
CNC to SVM?
• Check for poor contact in the command cable between the
CNC and SVM.
• Use the servo check pin board to check the signal level.
(b) For the multi-axis amplifier, is the MCON signal sent to all
axes?
(4) External MCC
(a) Is the external MCC connected correctly and is there any
problem in the external MCC itself?
(5) Timing of turning on the power to the CNC (200 VAC, single
phase) and the PSM control power (200 VAC, single phase)
(a) Was the power to the CNC turned on at the same time when,
or after, the power for PSM control was turned on?
(6) Is there an unused axis in a multi-axis amplifier?
(a) Is a dummy connector inserted in the amplifier?
(b) Are CNC parameters set correctly?