Carrier D2-3466-2 instruction manual Checking the Power Modules and Motor with Input Power Off

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6.3Checking the Power Modules and Motor with Input Power Off

Use the following procedure to check the drive’s Power Module circuitry with power off:

ATTENTION: DC bus capacitors retain hazardous voltages after input power has been disconnected. After disconnecting input power, wait five

!(5) minutes for the DC bus capacitors to discharge and then check the voltage with a voltmeter to ensure the DC bus capacitors are discharged before touching any internal components. Failure to observe this precaution could result in severe bodily injury or loss of life.

Step 1. Turn off and lock out input power. Wait five minutes.

Step 2. Verify that there is no voltage at the drive’s input power terminals.

Step 3. Check the DC bus potential with a voltmeter as described in section 6.2 to ensure that the DC bus capacitors are discharged.

Step 4. Disconnect the motor from the drive.

Step 5. Check all AC line and DC bus fuses.

Step 6. If a fuse is open, use a multimeter to check the input diodes and output IGBTs. See table 6.1.

Step 7. Check motor impedance.

Step 8. Reconnect the motor to the drive.

Step 9. Reapply input power.

6-4

Carrier VFD Quick Reference

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Contents Carrier VFD Quick Reference Page Page Page Page Page Contents Carrier VFD Quick Reference Required Publications Getting Assistance from Reliance ElectricCarrier VFD Quick Reference Replace with 2.fm 11 X 17 Z-fold Carrier VFD Quick Reference Monitor Mode Carrier VFD Quick Reference For Carrier Drives Carrier VFD Quick Reference Record the following job information Record the following nameplate informationCarrier VFD Quick Reference Test Equipment Needed To Troubleshoot Verifying That DC Bus Capacitors Are DischargedPOS NEG TP1 TP2 Initial DC Bus Checking the Power Modules and Motor with Input Power Off Igbt Fault Codes Troubleshooting the Drive Using Error CodesAlarm Codes Error LogIdentifying Alarm Codes and Recovering Alarm Code Description Alarm Cause Corrective ActionIdentifying Fault Codes and Recovering Fault Code Description Fault Cause Corrective ActionIPL OPL Asymmetrical Bus When Input Ground Fault ExcessiveSlow Ramp Rate of DC Bus DC Carrier VFD Quick Reference Troubleshooting the Drive Identifying Fatal Fault Codes and Recovering Code Fault Description Fault Cause Corrective ActionResetting a Checksum CHS Fault Indentifying PMC Board Fault Codes and RecoveringStatus of LEDs Fault Description Corrective Action Model Amps Code Number DIF Technical Writing Internal UsePage Page Publication D2-3466-2 May 2005 -- Supercedes D2-3466-1 June
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