Chapter 6 Fastening Operation
PAGE 6-33
● Current Value Warnings
Motor current draw during fastening is monitotred and can be used to monitor the motor current
draw over time (for PM evaluation). After the end of the fastening operation, the peak current
value is judged to be within the high and low limit ranges. If the peak current value during
operation falls below the low current limit or exceeds the high current limit, (even though the
controller may output an ACCEPT for the fastening), the PLC output signals “Multi: Current Limit
Warning,” “Axis: Current Limit Warning,” “Axis: Current Low Warning,” or “Axis: Current High
Warning” is turned “ON.”
・The current value warning judgment cannot be disabled.
・The full scale current is based on the motor used and is set automatically for the controller
smodel used. Do not change this value if there is no special reason to do so.
·The max current value differs depending on the motor type of the tool used.
(M50 : 10 A, M 80 : 16 A, M 120 : 21 A)
Additionally, the Fastening Current Limit value (D-No.523) limits the maximum value of the current
during the fastening operation. If a value lower than the full scale current is set, the motor current
during the fastening process will not exceed the value set as this current limit. The current limit value is
used to protect the motor during the execution of torque recovery (if used) (which is an after-fastening
operation). When the current limit is exceeded, the fastening is stopped and the abnormal state signal
A05-01 “Servo Reply Error” is output.
520: No Load Current Limit:10%
523: Fastening Current Limit :100%
522: High Current Warning :100%
521: Low Current Warning : 0%
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