
3.SAFETY FUNCTIONS B-64004EN/02
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3.12 SEFETY POSITION ERROR MONITORING FUNCTION
Both the CNC and the SV check whether the servo following error of
each axis exceeds the limit of deviation specified by the parameters.
If the servo following error exceeds, an alarm is generated and MCC
OFF signal (*MCFVx) is output immediately.
The relation between the safety monitoring state and the parameter of
limit of deviation is shown in the following table.
Safety monitoring is
activated
(In case *VLDVx =0)
Safety monitoring is not
activated
(In case *VLDVx =1)
Moving No.1838 No.1841
Stopping No.1839 No.1842
Servo-off No.1840 No.1840
Error detected CPU Alarm
CNC SV1072/SV1071/SV1069
SV SV0474/SV0475/SV1070
When position deviation exceeds the limit given by the parameter
(No.1839 in stop state, No.1838 in moving state and No.1840 in servo
off state) during safety monitoring, Monitoring result signal RSVx is
set to “0” regardless of the state of Safety check request signal
*VLDVx.
This function is valid after the reference position return is finished or
the follow-up of absolute position is finished in case an absolute
position coder.
CAUTION
This function is activated only in position control
mode. This function is not activated in torque and
velocity control mode.