YASKAWA CDBR-****D User & Installation Manual

Also see for LKEB Series: Installation manual Instructions

Contents

60 YASKAWA ELECTRIC TOBP C720600 01E YASKAWA AC Drive Option CDBR-D, LKEB- Installation Manual8 Troubleshooting8 TroubleshootingProblems Cause Possible SolutionThe thermal relay (or the thermalprotector) on the LKEB brakingresistor unit trips while stopped oroperating at steady speed (nodeceleration).There is not a CDBR braking unitconnected and the DC bus brakingtransistor short circuited.Replace the drive.The DC bus braking transistor in theCDBR braking unit is short circuitedas indicated by contacts EA-EB-EC.Replace the CDBR braking unit.CDBR braking unit DIP switch S3for the power supply voltage is set tothe wrong position.Set DIP switch S3 to the correctposition.The drive faults on overvoltage.The braking resistor unit is too small. Re-evaluate the braking conditionsrequired for the application.Incorrect wiring or CDBR switchpositions.Inspect the wiring, switch settings,and correct any mistakes.The CDBR braking unit is damaged. Replace the CDBR braking unit.The thermal relay (or the thermalprotector) on the braking resistor unittrips occasionally.The braking resistor unit is too small. Re-evaluate the braking conditionsrequired for the application.The CDBR braking unit is damaged. Replace the CDBR braking unit.Incorrect CDBR switch position. Correct the switch settings.Incoming main power supply voltageincreases momentarily.Investigate the cause of high inputvoltage.Fault output contacts MA-MB-MCchange states. Overvoltage (ov) mayoccur on drive:- CDBR heatsink overheat- CDBR transistor overcurrentThe application is experiencingexcessive starting and stopping, orthe load inertia is too large for theCDBR unit.Re-evaluate the brakingrequirements.The CDBR braking unit and LKEBbraking resistor unit are notappropriately matched.Correctly match the CDBR brakingunit and LKEB braking resistor unit.Resistor is wired incorrectly. Check for proper resistance.Ambient temperature exceeded50°C (122°F). CDBR heatsink is toohot.Reduce the ambient temperature.The CDBR braking unit is damaged. Replace the CDBR braking unit.