3 Electrical Installation ‹ 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. • If using a ground fault circuit breaker, make sure that it can detect both DC and high frequency 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. • Never share the ground wire with other devices such as welding machines, etc. • Always use a ground wire, that complies with electrical equipment technical stan- dards. Keep ground wires as short as possible. Leakage current is caused by the drive. Therefore, if the distance between the ground electrode and the ground termi- nal is too long, potential on the ground terminal of the drive will become unstable. • When using more than one drive, do not to loop the ground wire. „ 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. • Separate wiring for control circuit terminals MA, MB, MC (contact output) from wir- ing to other control circuit terminals. 12 I67E-EN V1000 Quick Start Guide