Inverter Application Precautions
10-3
îš‹ Settings
Observe the following precautions when making settings for an Inverter.
îš„Upper Limits
The maximum output frequency can be set up to 120Hz. Setting the output frequency too high can damage the
machine. So pay attention to the mechanical system and observe required limits for the output frequency.
îš„DC Injection Braking and Motor Preheat
If the DC injection braking current, the braking time or the motor preheat current or are set too high the motor
can overheat what can damage the motor.
îš„Acceleration/Deceleration Times
The motor's acceleration and deceleration times are determined by the torque generated by the motor, the load
torque, and the load's inertial moment (GD
2
/4). If the stall prevention functions are activated during accelera-
tion or deceleration, it might be necessary to increase the acceleration or deceleration time.
To reduce the acceleration or deceleration times, increase the capacity of the motor and Inverter.
îš‹ Handling
Observe the following precautions when wiring or performing maintenance for an Inverter.
îš„Wiring Check
The Inverter will be internally damaged if the power supply voltage is applied to output terminal U, V, or W.
Check wiring for any mistakes before supplying power. Check all wiring and control sequences carefully.
îš„Magnetic Contactor Installation
If a magnetic contactor is installed in the power supply line, do not exceed one start every 30 minutes. Switch-
ing more often can damage the inrush current prevention circuit.
îš„Maintenance and Inspections
After turning OFF the main circuit power supply it can take several minutes before the DC bus is discharged
completely. The CHARGE LED, indicating if the DC bus is charged, glows above a voltage of 10VDC.
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