Carrier D2-3466-2 instruction manual Test Equipment Needed To Troubleshoot

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CHAPTER 6

Troubleshooting the Drive

This chapter describes how to troubleshoot the drive and the equipment that is needed to do so.

6.1Test Equipment Needed To Troubleshoot

An isolated multimeter will be needed to measure DC bus voltage and to make resistance checks. Note that dedicated troubleshooting test points are not provided.

6.2Verifying That DC Bus Capacitors Are Discharged

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.

The drive’s DC bus capacitors retain hazardous voltages after input power has been disconnected. Perform the following steps before touching any internal components:

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. Measure the DC bus potential with a voltmeter while standing on a non-conductive surface and wearing insulated gloves (1000 V).

Measure the DC bus potential at the test points on the Power Module Interface board. See figure 6.1 for 414 amp drives; see figure 6.2 for 500 amp and 643 amp drives.

Step 4. Once the drive has been serviced, reapply input power.

Troubleshooting the Drive

6-1

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Contents Carrier VFD Quick Reference Page Page Page Page Page Contents Carrier VFD Quick Reference Getting Assistance from Reliance Electric Required PublicationsCarrier 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 nameplate information Record the following job informationCarrier VFD Quick Reference Verifying That DC Bus Capacitors Are Discharged Test Equipment Needed To TroubleshootPOS NEG TP1 TP2 Initial DC Bus Checking the Power Modules and Motor with Input Power Off Igbt Error Log Troubleshooting the Drive Using Error CodesAlarm Codes Fault CodesAlarm Code Description Alarm Cause Corrective Action Identifying Alarm Codes and RecoveringFault Code Description Fault Cause Corrective Action Identifying Fault Codes and RecoveringIPL OPL Asymmetrical Bus When Input Ground Fault ExcessiveSlow Ramp Rate of DC Bus DC Carrier VFD Quick Reference Troubleshooting the Drive Code Fault Description Fault Cause Corrective Action Identifying Fatal Fault Codes and RecoveringResetting a Checksum CHS Fault Indentifying PMC Board Fault Codes and RecoveringStatus of LEDs Fault Description Corrective Action Model Amps Code Number Technical Writing Internal Use DIFPage Page Publication D2-3466-2 May 2005 -- Supercedes D2-3466-1 June
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