IAI America PCON-CFA - Manual (Page 194)

4. SCON-CA
186
(26) Load Output Judgment (LOAD) PLC Input signal
This signal is effective only in push-motion operation.
To use the LOAD signal in a press-fit application, whether the load has reached the specified threshold must be
detected during push-motion operation. Set the load threshold and certification band on the PLC. When the
command torque (motor current) exceeds the threshold within the certification band, this signal turns ON.
Whether or not to turn ON this signal is determined based on whether or not the command torque has exceeded
the threshold for the specified time.
This processing procedure is the same as with the push judgment. The judgment time on load output can be
changed to a desired value in parameter No. 50, “Load output judgment time.”
Once this signal turns ON, its status will be retained until the next movement command is received.
• The push speed is set by parameter No. 34, “Push speed.”
The factory setting is determined individually and varies according to the actuator characteristics.
Specify an appropriate speed by considering the material and shape of the work part, etc.
• Set parameter No. 50, “Load output judgment time.”
• Set the threshold certification band using the zone boundary+ register and zone boundary- register of the
PLC.
• Set the threshold using the load current threshold register of the PLC.
• Set the positioning band using the positioning band register of the PLC.
Set a band that extends slightly beyond the last position to account for mechanical variation of the work part.
For details, refer to the operation manual for your controller.
Caution: Even though it appears to be stationary, the actuator continues to push the work part at the
standstill push current determined by the current-limiting value.
Exercise due caution when handling the actuator or surrounding parts/objects in this condition
because the actuator is not stopped.
This signal turns ON in this
torque certification zone if the
command torque exceeds the
threshold.
The position complete signal turns ON
here based on a judgment that the actuator
has contacted the work part and completed
the push-motion operation.
Speed
Travel
Certification band
Target position
Positioning band (maximum push-in amount)