
B-64004EN/02 3.SAFETY FUNCTIONS
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The user of the machine must first carry out a reference position return
in order to obtain the initial position. If the reference position return is
not carried out, the check function is disabled. This check function is
enabled after the reference position is established. (The function
cannot be disabled by any means after the reference position is
established.) A safe machine position limit on each feed axis is
specified in a safety parameter.
CAUTION
A machine operator must confirm whether the
machine reference position is established correctly
by checking the actual machine position and
position display of the CNC.
At power-on, the safety function does not work. After power-on, the
CNC checks whether a reference position return is completed. If the
reference position return is completed and if the protective door is
open, safe machine position monitoring, safe speed monitoring and
safety position error monitoring are performed. Then, the safety
functions start working. If the reference position return is not
completed, safe machine position monitoring cannot be performed
because the coordinates are not established. In this state, the machine
position monitoring function is disabled. After a reference position
return is made, this function is enabled. Depending on the safety
parameter setting, however, an alarm may be raised. To avoid this
alarm, specify the safe machine position parameters before making a
reference position return.
CAUTION
1 The machine coordinate of the safety function is
based on position feed back. So it does not always
indicate the same value as the machine coordinate
based on the summation of the command value.
2 This function is activated only in position control
mode. This function is not activated in torque
control mode.