Danfoss VLT CDS 302, Troubleshooting Manual

Page 1: ...Compressor Drives Troubleshooting Check List CDS 302 CDS 303 http cc danfoss com...

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Page 3: ...n 7 Environmental conditions 7 Proper clearance 7 Trouble shooting 8 Fault Symptoms Display of the drive 8 No display blank display 8 Intermittent display 8 Fault Symptoms in the compressor motor 9 Co...

Page 4: ...sary use of resources and limit the number of NFF The purpose of this check list is to facilitate users field technicians engineers and service personnel working with Danfoss frequency converters to i...

Page 5: ...an remain charged even when the frequency converter is not powered To avoid electrical hazards disconnect AC mains any permanent magnet type motors and any remote DC link power supplies including batt...

Page 6: ...start Figure 2 WARNINGS and ALARM messages are displayed when the frequency converter fault detects a faulty condition WARNINGS and ALARM Alarm Log Check the content of the alarm log 5 latest alarms a...

Page 7: ...e subject The drive should be mounted solidly or the use of shock mounts employed Under specific conditions these units can be operated within a maximum ambient temperature of 50 C 24h average maximum...

Page 8: ...pletely dark An error code exists in the drive which indicates that communications may have failed with the control card This is typically seen when an option card has been installed in the drive and...

Page 9: ...t verify that the unit is properly powered up and there is no warning or alarm The most common cause of this is either incorrect control logic or an incorrectly programmed drive Such occurrences will...

Page 10: ...zero or missing Check the control wiring to ensure that a proper reference signal is present at the drive input terminals and that the unit is properly programmed to accept the signal provided Improp...

Page 11: ...otor settings references and limits and I O configuration The drives must be set up correctly for the compressors connected to it If not the compressor may fail to start or use higher than normal amou...

Page 12: ...ature measurement circuit is defective When a current sensor fails it is indicated sometimes by an earth fault alarm that cannot be reset even with the motor leads disconnected Disconnect the motor fr...

Page 13: ...ned drive trips Detrimental Effects To These Systems May Include The Following Pressure flow temperature signal transmitter signal distortion or aberrant behaviour Radio and TV interference Telephone...

Page 14: ...negative terminal of the multimeter meter lead to the positive DC bus Connect the positive terminal of the multimeter lead to the input terminal L1 L2 L3 in turn The multimeter should show the diode...

Page 15: ...Step 1 Step 2 Step 3 Connect the positive terminal of the multimeter lead to the positive DC bus Connect the negative terminal of the multimeter lead to the motor terminal U V W in turn The multimete...

Page 16: ...rminal of the meter lead to the negative DC bus Connect the negative terminal of the meter lead to the motor terminals U V W in turn The multimeter should show diode drop around 0 4 volts Figure 19 Th...

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