NOTICE: Install the MC on the input side of the drive when the drive should not automatically restart afterpower loss. To get the full performance life out of the electrolytic capacitors and circuit relays, refrain fromswitching the MC more than once every 30 minutes. Frequent use can damage the drive. Use the drive tostop and start the motor.n Protecting the Braking Resistor or Braking Resistor UnitUse an MC on the input side of the drive to protect a braking resistor or braking resistor unitfrom overheat or fire.WARNING! Fire Hazard. When using a braking unit, use a thermal relay on the braking resistors and configurea fault contact output for the braking resistor unit to disconnect drive main power via an input contactor.Inadequate braking circuit protection could result in death or serious injury by fire from overheating resistors.u Connecting an AC or DC ReactorAC and DC reactors suppress surges in current and improve the power factor on the input sideof the drive.Use a DC reactor or AC reactor or both:• To suppress harmonic current or improve the power factor of the power supply.• When using an advancing capacitor switch.• With a large capacity power supply transformer (over 600 kVA).Note: Use an AC or DC reactor when also connecting a thyristor converter (such as a DC drive) to the same powersupply system, regardless of the conditions of the power supply.n Connecting an AC ReactorBAC DR/L1UVWXYZS/L2T/L3A – Power supplyB – MCCBC – AC reactorD – DriveFigure 7.4 Connecting an AC Reactorn Connecting a DC ReactorEnsure the jumper between terminals +1 and +2 (terminals are jumpered for shipment) isremoved when connecting a DC reactor. The jumper must be installed if no DC reactor isused. Refer to Connecting a DC Reactor on page 174 for an example of DC reactor wiring.7.4 Installing Peripheral DevicesYASKAWA ELECTRIC TOEP C710606 25B YASKAWA AC Drive J1000 Installation & Start-Up Manual 1737 Peripheral Devices &Options
