u Zero-Phase ReactorA zero-phase reactor can be used to reduce the noise on the input and output sides of the drive.Close-up of V/T2-phase wiring1st pass4th pass3rd pass2nd passD EFCBAPass each wire (U/T1, V/T2, W/T3)through the core 4 times.R/L1S/L2T/L3U/T1V/T2W/T3A – Power supplyB – MCCBC – Zero-phase reactor on input sideD – DriveE – Zero-phase reactor on output sideF – MotorFigure 8.10 Zero-Phase Reactoru Installing Fuses on the Input SideAlways install input fuses to the input side of the as a protective measure against damage caused by a short circuit.Refer to Factory Recommended Drive Branch Circuit Protection on page 243 for details on input fuse selection.u Attachment for External HeatsinkAn external attachment can be used to project the heatsink outside of an enclosure to ensure that there is sufficient air circulationaround the heatsink. This installation method still requires a certain amount of airflow over the drive case. Refer to OutputCurrent Derating Due to Ambient Temperature on page 186 if derating is required. Contact a Yaskawa sales representativefor more information.u Noise Filter InstallationThis drive has undergone testing in conformance with IEC61800-5-1: 2007 and is in compliance with low voltage directives.Refer to EMC Guidelines Compliance on page 236 for information on selecting a noise filter.u Installing a Motor Thermal Overload (oL) Relay on the Drive OutputMotor thermal overload relays protect the motor by disconnecting power lines to the motor due to a motor overload condition.Install a motor thermal overload relay between the drive and motor:• When operating multiple motors on a single AC drive.• When using a power line bypass to operate the motor directly from the power line.It is not necessary to install a motor thermal overload relay when operating a single motor from a single AC drive. The ACdrive has UL recognized electronic motor overload protection built into the drive software.Note: Disable the motor protection function (L1-0 1 = “0”) when using an external motor thermal overload relay. The relay should shut off mainpower on the input side of the main circuit when triggered.n General Precautions when Using Thermal Overload RelaysThe following application precautions should be considered when using motor thermal overload relays on the output of ACdrives in order to prevent nuisance trips or overheat of the motor at low speeds:• Low speed motor operation• Use of multiple motors on a single AC drive• Motor cable length• Nuisance tripping resulting from high AC drive carrier frequencyLow Speed Operation and Motor Thermal oL RelaysGenerally, thermal relays are applied on general-purpose motors. When general-purpose motors are driven by AC drives, themotor current is approximately 5 ~ 10% greater than if driven by the commercial power supply. In addition, the cooling capacityof a motor with a shaft-driven fan decreases when operating at low speeds. Even if the load current is within the motor rated8.4 Installing Peripheral DevicesYASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual 1718 Peripheral Devices &Optionshttp://nicontrols.com
