i.4 Notes on Using Drives
YASKAWA ELECTRIC
TOEP C710687 03B FSDrive-MV1000 Parameter Guide
17
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Effects of Distortion in Power Supply
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, and cause in high relative harmonic
content.
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Settings
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Driving Multiple Induction Motors
Use V/f control when running multiple induction motors using a single drive.
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Upper Limits
The drive can be operated at speeds up to 120 Hz. Set an upper limit by using the upper limit frequency setting function.
The default setting for the maximum output frequency is 60 Hz.
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Acceleration/Deceleration Times
Acceleration and deceleration times are affected by the amount of torque generated by the motor, the load torque, and the
inertia moment. Set a longer accel/decel time when Stall Prevention is enabled. The accel/decel times are lengthened for
as long as the Stall Prevention function is in operation. Install one of the available braking options or increase the
capacity of the drive for faster acceleration and deceleration.
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General Handling
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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.
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Circuit 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 main circuit power supply and the drive. Use a low-surge type
Vacuum Circuit Breaker for drive primary side breaker.
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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 or serious injury or death. 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.
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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.
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Hoisting
Some large capacity drives require that the transformer, not the transformer panel, be hoisted directly. Hoisting the drive
panel may damage the drive. Refer to FSDrive-MV1000 Instructions (Manual No. TOEP C710687 02) for details.
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