YASKAWA A1000 Quick Start Manual page 18

3 Electrical Installation

Main and Control Circuit Wiring

Wiring the Main Circuit Input
Consider the following precautions for the main circuit input.
• If not built in the cabinet, use fuses recommended in
• If using a ground fault circuit breaker, make sure that it can detect both DC and high frequency current.
• If using an input switch, make sure that this switch is not operated more than once every 30 minutes.
• Use insulation caps when wiring the drive with crimp terminals. Take particular care to ensure that wiring does not
touch neighboring terminals or the surrounding case.
• Use an 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 transformer (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 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 M1-M2, M3-M4, M5-M6, 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.
• If flexible wires with ferrules are connected they might fit tightly into the terminals. To disconnect them, grasp the wire
end with a pair of pliers, release the terminal using a straight-edge screw driver, turn the wire for about 45 and pull it
gently out of the terminal. For details, refer to the Technical Manual.Use this procedure for removing the wire link
between HC, H1 and H2 when the Safe Disable function is utilized.
EN 18
Power Supply Side Cable Connections on page 16
YASKAWA Europe TOEP C710616 88A - AC Drive A1000 IP23/54 Floor Standing - Quick Start Guide
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