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Main and Control Circuit Wiring
Wiring the Main Circuit Input
Consider the following precautions for the main circuit input.
• Use only circuit breakers that have been designed specifically for drives.
• When using residual current monitoring or detection devices (RCM/RCD), make sure the
devices are designed for use with AC drives (e.g. type B according to IEC 60755).
• If using a ground fault circuit breaker, make sure that it can detect both DC and high fre-
quency current.
• If using an input switch is used, make sure that the switch does not operate not more than
once every 30 minutes.
• 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
2
or 16 mm
(Al).
–The power supply must be disconnected automatically in case of discontinuity of
the protective earthing conductor.
• Keep ground wires as short as possible.
YASKAWA Electric TOEP C710606 27 AC Drive - J1000 Quick Start Guide
3 Electrical Installation
2
(Cu)
EN15
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