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• The cooling fans and braking resistors become very hot. Do not touch.
Failure to observe this could result in burns.
• Mechanical holding is not possible with the inverter brake function.
Failure to observe this could result in injury.
• The digital input terminals are equipped with a function used to start and stop operation or change the
speed command with the "FWD" operation command or "BX" free-run command and so on. Depending on
the digital input terminal status, operation may start suddenly, or the speed may change significantly simply
by changing the function code settings. Make changes to function code settings after sufficiently ensuring
safety.
• With digital input, functions ("SS1, SS2, SS4, SS8", "Hz2/Hz1", "Hz/PID", "IVS", "LE", etc.) used to change
the operation procedure for operation commands or command procedure for speed commands can be
assigned. Depending on the conditions, changes to these signals may result in operation being started
suddenly or the speed changing suddenly.
• Ensure safety before modifying customizable logic related function code settings (U codes and related
function codes) or turning ON the "Cancel customizable logic" terminal command CLC. Depending upon the
settings, such modification or cancellation of the customizable logic may change the operation sequence to
cause a sudden motor start or an unexpected motor operation. Carry out a sufficient safety check
beforehand.
Failure to observe this could result in an accident or injury.
Speed control mode
• If the control constant for the automatic speed regulator (ASR) used with speed control is not at an
appropriate value, even if the operation command is turned OFF, deceleration control may not be
performed, and stop conditions may not be met due to such reasons as hunting caused by a high gain
setting. As a result, operation may continue.
• Hunting due to a high response may occur in the low-speed area when decelerating, the speed detection
value may deviate from the zero speed area before the continuous zero speed control time (F39) has
elapsed, the mode may change to low-speed mode again without stop conditions being met, and operation
may continue.
• If the actual speed deviates from the speed command after adjusting the ASR control constant to an
appropriate value and applying the speed mismatch alarm function, an alarm is tripped, allowing the motor
to be stopped safely. Furthermore, taking measures such as changing the ASR control constant setting
based on the speed, or judging stop speed detection with a speed command value allows the inverter to
successfully control the motor.
Failure to observe this could result in an accident or injury.
Torque control mode
• When performing torque control, in cases such as when the motor is being rotated from the load side with
torque greater than that specified with the torque command, there are times when torque conditions are not
met, and operation continues even when the operation command is turned OFF.
• If wishing to cut the inverter output at such times, take measures such as changing to speed control and
bringing the motor to a decelerated stop, or issuing a coast to stop command.
Failure to observe this could result in an accident or injury.
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