Settings; General Handling - YASKAWA FSDrive-MV1000 Instructions Manual

i.4 Notes on Using Drives
Effects of Distortion in Power Supply
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When the power supply voltage is originally distorted, or when multiple devices and the drive are connected to the same
power supply, drive harmonics from the power supply system flow into the drive, resulting in high relative harmonic
content.

◆ Settings

Driving Multiple Induction Motors
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Use V/f control when running multiple induction motors using a single drive.
Upper Limits
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The drive can be operated at high speeds of up to 120 Hz, and making incorrect settings is dangerous. Set an upper limit
by using the upper limit frequency setting function.
The default setting for the maximum output frequency when operating with external input signals is 60 Hz.
■ Acceleration/Deceleration Time
Acceleration and deceleration times are determined by the torque that the motor generates, the load torque and the inertia
moment (GD ). Set a longer accel/decel time when the stall prevention function is activated during accel/decel. When the
2
stall prevention function is activated, the accel/decel time is extended to cover the time that the function operates. To
achieve even faster acceleration and deceleration, select motors, and a drive, with greater capacity.

◆ General Handling

■ Wiring Check
Never short the output terminals of the drive or apply voltage from the power supply to the output terminals (U, V, W).
This will damage the drive.
Carry out wiring that conforms to the wire gauges and tightening torques described in this manual. Conduct a thorough
check of wiring and sequences before turning the power on.
Breaker or Magnetic Contactor Selection and Installation
■
Select a breaker with sufficient capacity for the main circuit power supply side of the drive, taking the inrush current
from the transformer into account.
Avoid using the breaker or magnetic contactor for frequent starting or stopping. This may damage the drive. Do not
switch the breaker or magnetic contactor ON/OFF more than twice a day. If it is operated more frequently, install an
optional inrush current suppression circuit between the power supply and the drive. Use a low-surge type Vacuum Circuit
Breaker for drive primary side breaker.
■ Inspection and Maintenance
Even when the power supply of the medium-voltage main circuit to the drive is shut off, it takes some time for the
internal capacitors to discharge. Wait until the CHARGE LED goes off before starting inspection. While an residual
electric charge remains in the capacitor, the surface and inside of the Power Cell will carry a high voltage, so there will be
a risk of death or serious injury. The heatsink of the Power Cell can become quite hot during operation, and proper
precautions should be taken to prevent burns.
When replacing the cooling fan, shut off the main circuit's power and then wait at least 15 minutes. Then, shut off the
control circuit's power and make sure that the cooling fan has fully stopped before starting the work.
■ Wiring
When wiring UL/cUL-compliant drives, refer to the notes on complying with the UL and cUL standards given in the
instruction manuals. For details, contact your Yaskawa representative.
Transportation and Installation
■
Never steam clean the drive. During transportation and installation, the drive must never be exposed to an atmosphere
containing a halogen gas such as fluorine, chlorine, bromine, or iodine.
16 YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions