YASKAWA L1000H Quick Start Manual page 14

3 Electrical Installation
• If using a ground fault circuit breaker, make sure that it can detect both DC and high fre-
quency current.
• When frequently switching on/off power supply (e. g. for energy saving reasons) make
sure the power is not cycled more than 54 times per day.
• Use a DC reactor or AC reactor on the input side of the drive:
• To suppress harmonic current.
• To improve the power factor on the power supply side.
• When using an advancing capacitor switch.
• With a large capacity power supply transistor (over 600 kVA).
Wiring the Main Circuit Output

Consider the following precautions for the output circuit wiring.
• Do not connect any other load than a 3 phase motor to the drives output.
• Never connect a power source to the drives output.
• Never short or ground the output terminals.
• Do not use phase correction capacitors.
• If using a contactor between the drive and motor, it should never be operated when the
drive is outputting a voltage. Operating while there is voltage output can cause large peak
currents, thus tripping the over current detection or damage the drive.
 Ground Connection
Take the following precautions when grounding the drive:
• The drive must always be connected to ground in accordance to the general technical stan-
dards and local regulations.
As the leakage current produced by the drive exceeds 3.5 mA, according to IEC 61800-5-
1, at least one of the conditions below must be satisfied:
• The cross-section of the protective earthing conductor must be at least 10 mm
or 16 mm (Al).
2
• The power supply must be disconnected automatically in case of discontinuity of the
protective earthing conductor.
• Keep ground wires as short as possible.
• Always make sure the ground impedance is conformed to the requirements of local safety
and installation regulations.
• Never share the ground wire with other devices such as welding machines, etc.
• Do not loop the ground wire when using more than one drive.
 Control Circuit Wiring Precautions
Consider the following precautions for wiring the control circuits.
• Separate control circuit wiring from main circuit wiring and other high-power lines.
EN 14 YASKAWA Europe TOEP C710606 91B AC Drive L1000H - Quick Start Guide
(Cu)
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