5.3 Description of Function Codes 5.3.8 J codes (Applied functions)
[ 5 ] Overload stop function
Overload stop function (Detection value, Detection level, Operation selection, Operation
mode, Timer time)
Overload stop function (Torque limiting P (Gain), Torque limiting I (Integral time),
Current limiting level)
Detects an overload status and if it exceeds the specified detection level (J64) for the specified timer duration (J67),
the operation is stopped based on the selected action (J65). It is used to protect the system when an unacceptable
overload is applied or to lock the motor shaft by mechanically hitting it to the stopper.
This function is disabled while motor 2 to 4 is selected.
Item selection (J63)
Select a target (detected item) to monitor the load status.
To improve the accuracy of calculated torque, perform auto-tuning. Select
the driving torque as the target.
The no-load current always flows to the motor. Specify J64 (Detection
level) correctly considering the no-load current of the applied motor.
Detection level (J64)
Set the value for overload detection level in percentage (%) of the motor rated torque or current.
When stopper contact is selected (J65 = 3), detection is performed at motor rated torque of 100%, regardless of
the J64 setting.
(See Fig. 5.3-35)
Under sensorless vector control (synchronous motors), the function is disabled at a speed of 10% or less
of the base frequency.
Mode selection (J65)
Select an operation when the load exceeds the value specified in J64.
Overload stop function operation cancel
Decelerates to stop the motor, as specified in deceleration time.
Immediately shuts down the inverter, allowing the motor to coast to a stop.
The motor decelerates with torque limiting operation, and current control is
performed to ensure the holding torque. Current control continues until the
run command is turned OFF. Apply the brake before turning OFF the run
command.
“IOL” and “IOL2” are output during stopper contact control.
When stopper contact is selected, perform auto tuning.
• When overload stop function operation begins, that mode is maintained, preventing re-acceleration.
To accelerate, turn OFF the run command, and then turn it back ON again.
• Under vector control with speed sensor and sensorless vector control, the J65 = 3 stopper contact
function is disabled.
• The motor may overheat if stopped for a long period of time with the stopper contact function.
• If using the stopper contact function for lifting applications, be sure to use in combination with the
machine brake.
• Even if J65 is set to 3, if normal torque limiting is enabled first during acceleration, etc., the stopper
contact function will be disabled. Set the operation mode (J66) and timer time (J67) to ensure that the
stopper contact function is enabled after the normal torque limit operation ends.
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