CV7300 Instruction Manual - TECO-Westinghouse Motor Company
CV7300 Instruction Manual - TECO-Westinghouse Motor Company
CV7300 Instruction Manual - TECO-Westinghouse Motor Company
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Troubleshooting for OV, LV error<br />
The inverter displays OV, LV<br />
Is the main circuit fuse<br />
intact?<br />
YES<br />
Any abnormalities in<br />
appearances?<br />
NO<br />
Apply the power<br />
Any abnormal<br />
indications?<br />
NO<br />
Input operation command<br />
Is FWD LED keeping<br />
lit after flash?<br />
YES<br />
Input frequency commands<br />
Is the output frequency of the<br />
operating unit displayed?<br />
YES<br />
Are there<br />
voltage output at T1,T2,T3<br />
output terminals?<br />
YES<br />
Connect the motor to run<br />
Any abnormal value?<br />
NO<br />
Any current of all<br />
phase even?<br />
YES<br />
The inverter’s output is OK<br />
NO<br />
YES<br />
NO<br />
YES<br />
NO<br />
NO<br />
YES<br />
NO<br />
Replace the control board<br />
Replace the control board<br />
Replace the control board<br />
5-11<br />
Chapter 5 Troubleshooting and maintenance<br />
Replace the main circuit fuse<br />
Replace the faulty circuit<br />
board<br />
Replace the control board<br />
Is the inverter<br />
working well after<br />
replacement<br />
YES<br />
The inverter faults<br />
NO<br />
Perform detailed check
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