2.2 InspectionPower electronics have limited life and may exhibit changes in characteristics or performance deterioration after years of useunder normal conditions. To help avoid such problems, it is important to perform preventive maintenance and periodicinspection on the drive.Drives contain a variety of power electronics such as power transistors, semiconductors, capacitors, resistors, fans, and relays.The electronics in the drive serve a critical role in maintaining proper motor control.Follow the inspection lists provided in this chapter as a part of a regular maintenance program.Note: The drive will require more frequent inspection if it is placed in harsh environments, such as:• High ambient temperatures• Frequent starting and stopping• Fluctuations in the AC supply or load• Excessive vibrations or shock loading• Dust, metal dust, salt, sulfuric acid, chlorine atmospheres• Poor storage conditions.Perform the first equipment inspection one to two years after installation.u Recommended Daily InspectionTable 2.1 outlines the recommended daily inspection for Yaskawa drives. Check the following items on a daily basis to avoidpremature deterioration in performance or product failure. Copy this checklist and mark the “Checked” column after eachinspection.Table 2.1 General Recommended Daily Inspection ChecklistInspection Category Inspection Points Corrective Action CheckedMotor Inspect for abnormal oscillation or noise coming fromthe motor.• Check the load coupling.• Measure motor vibration.• Tighten all loose components.CoolingInspect for abnormal heat generated from the drive ormotor and visible discoloration.Check for the following:• Excessive load.• Loose connections.• Dirty heatsink or motor.• Ambient temperature.Inspect drive cooling fan and circulation fan operation.Check for the following:• Clogged or dirty fan.• Correct Fan operation parameter setting.Environment Verify the drive environment complies with thespecifications listed in the Specifications chapter in theUser Manual packaged with the drive.Eliminate the source of contaminants or correct poorenvironment.Load The drive output current should not be higher than themotor or drive rating for an extended period of time.Check for the following:• Excessive load.• Correct motor parameter settings.Power Supply Voltage Check main power supply and control voltages.• Correct the voltage or power supply to withinnameplate specifications.• Verify all main circuit phases.2.2 Inspection168 YASKAWA ELECTRIC SIEP C710636 10C Z1000U HVAC MATRIX Drive Programming Manual
