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3 Electrical Installation
• 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 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.
• Never share the ground wire with other devices such as welding machines, etc.
• Always use a ground wire, that complies with electrical equipment technical standards.
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 terminal 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 wiring
to other control circuit terminals.
• For external control power supply use a UL Listed Class 2 power supply.
• Use twisted-pair or shielded twisted-pair cables for control circuits to prevent operating
faults.
• Ground the cable shields with the maximum contact area of the shield and ground.
• Cable shields should be grounded on both cable ends.
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J1000 Quick Start Guide
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