YASKAWA F7 User Manual
Also see for Varispeed f7: Connection manualProgramming manualUser guideInstruction manualUser manual
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Diagnostics & Troubleshooting 6 - 31Drive Date Stamp InformationThis information is used to determine when a Drive was built to see if it is within its warranty period. The date stamp is locatedon the lower right side of the Drive.Fig 6.1 Date Stamp LocationTable 6.6 Main Circuit Test Procedure (continued)Check Procedure24Vdc Cooling Fans(Heat Sink & Internal)The Heat Sink & Internal Cooling Fans cool the heat sink as well as the output transistormodules of the Drive.1. Conduct a visual inspection to ensure the fan turns freely.2. If there is no physical evidence that the fan is bad, the fan motor can be checked with adigital multi-meter.3. Set the digital multi-meter to the R x 1 scale.4. Measure across the fan motor terminals. If 0Ω are measured, conclude that the fan motor isshorted. If infinite Ω are measured, conclude that the fan motor is burned open.5. If the fan is not working, then disconnect the fan and apply 24Vdc to the fan to test the motor.230/240Vac Cooling Fans(Heat Sink)The Heat Sink Cooling Fans cool the heat sink to remove heat from the Drive.1. Conduct a visual inspection to ensure the fan turns freely.2. If there is no physical evidence that the fan is bad, the motor can be checked with a digitalmulti-meter.3. Set a digital multi-meter to the R x 1 scale.4. Measure across the fan motor terminals. If the fan motor is good, the measured value shouldbe about 500Ω. If 0Ω are measured, conclude that the fan motor is shorted. If infinite ohms aremeasured, conclude that the fan motor is burned open.5. If the fan is not working, then disconnect the fan and apply 230/240Vac to the fan to test themotor.Cooling Fan FuseLarge Drive units contain a Cooling Fan Fuse. It is located on either the Gate Drive Board (3PCB)or the Tap Change Board (8PCB). If the Cooling Fan Fuse is open, then the 230/240Vac coolingfans may be defective.1. Set a digital multi-meter to the R x 1 scale.2. Place one lead of the multi-meter on one side of the fuse and place the other lead of the multi-meter on the other side of the fuse.3. If the fuse is good, the measured value will be 0Ω. If the fuse is bad, the measured value willbe infinite Ω.PRDINSP296 3. 31YEA ProductionManufacture DateInspector Number00.7.22 |
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