YASKAWA L1000A Quick Start Manual page 15


Main and Control Circuit Wiring

Wiring the Main Circuit Input
Note the following precautions when wiring the main circuit input:
• Use only fuses recommended in
• 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/EN 60755).
• If using an input switch, make sure that the switch does not operate more frequently 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 transformer (over 600 kVA).

Wiring the Main Circuit Output
Note the following precautions for the output circuit wiring:
• Do not connect any load other than a three-phase motor to the output side of the drive.
• Never connect a power source to the drive output.
• Never short or ground the output terminals.
• Do not use phase correction capacitors.
• Check the control sequence to make sure that the motor contactor is not turned ON or OFF during drive operation.
Turning on the motor contactor while voltage is output causes an inrush current that is likely to trigger the drive's
overcurrent protection.
Note:
The drive provides a Safe Disable function that can be utilized to reduce the number of motor contactors to one. Refer to
Disable Input Function on page 48

Ground Connection
Take the following precautions when grounding the drive:
• Make sure the ground conductor complies with the general technical standards and local regulations.
• Keep ground wires as short as possible.
• Always make sure the ground impedance is conform 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
Note 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 to M6, MA, MB, and MC (contact output) from wiring to other control
circuit terminals.
• 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.
• Note that flexible wires with ferrules may fit tightly into the terminals. To disconnect them, grasp the wire end with a
pair of pliers, release the terminal using a straight-edge screwdriver, 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.
YASKAWA ELECTRIC TOEP C710616 33G AC Drive L1000A - Quick Start Guide
Main Circuit on page 13.
for details.
3 Electrical Installation
Safe
EN 15