Parker AC890PX Product Manual

Also see for AC890PX Series: Product manual Quick start manual Engineering Reference User Mounting and Assembly Instructions

Contents

Parker AC890PX Product Manual Manual pdf 132 page image

Operating the Drive 6-18AC890PX AC DriveApplication Advice Application advice is available through our Technical Support Department, who can also arrange for on-site assistanceif required. Refer to the back cover of this manual for the address of your local Parker Hannifin Manufacturingcompany. Always use gold flash relays, or others designed for low current operation (5mA), on all control wiring. Remove all power factor correction equipment from the motor side of the drive before use. Avoid using motors with low efficiency and small cos ø (power factor) as they require a larger kVA rated drive toproduce the correct shaft kW.Brake MotorsBrake motors are used in applications requiring a mechanical brake for safety or other operational reasons. The motor can bea standard induction motor fitted with an electro-mechanical brake, or it could be a special conical rotor machine. In the caseof a conical rotor machine the spring-loaded brake is controlled by the motor terminal voltage as follows:At rest the motor is braked.When the motor is energised an axial component of the magnetic field due to the conical air-gap overcomes the force of thebrake spring and draws the rotor into the stator. This axial displacement releases the brake and allows the motor to acceleratelike a normal induction motor.When the motor is de-energised the magnetic field collapses and the brake spring displaces the rotor, pushing the brake discagainst the braking surface.Drives can be used to control the speed of conical rotor brake motors since the linear V/F characteristic maintains the motormagnetic field constant over the speed range. It will be necessary to set the FIXED BOOST parameter to overcome motorlosses at low speed (see the FLUXING menu on the Keypad).Using Output ContactorsThe use of output contactors is permitted. It is recommended that this type of operation be limited to emergency use only or ina system where the drive can be inhibited before closing or opening this contactor.