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Contents 1 Introduction 2 Operator Interface and ... - NO access

Contents 1 Introduction 2 Operator Interface and ... - NO access Contents 1 Introduction 2 Operator Interface and ... - NO access

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6 Test ProceduresHigh Power Service Manual for VLT ® FC SeriesFrequency ConvertersIf the 10 volts is present proceed with checking the individual inputs as follows.2. Connect the (-) negative meter lead to reference terminal 55.3. Connect the (+) positive meter lead to desired terminal 53 or 54.For analog input terminals 53 and 54, a DC voltage between 0 and +10 VDC should be read tomatch the analog signal being sent to the frequency converter. Or a reading of 0.9 to 4.8 VDCcorresponds to a 4 to 20 mA signalNote that a (-) minus sign preceding any reading above indicates a reversed polarity. In this case,reverse the wiring to the analog terminals.6.4 Initial Start Up or After Repair Drive Tests6Following any repair to a frequency converter or testing of a frequency converter suspected ofbeing faulty, the following procedure must be followed to ensure that all circuitry in the frequencyconverter is functioning properly before putting the unit into operation.1. Perform visual inspection procedures as described in Table 4-1.2. Perform static test procedures 6.2.1, 6.2.2 and 6.2.5 for D-frame size units or 6.2.3, 6.2.4and 6.2.5 for E-frame size units to ensure the frequency converter is safe to start.3. Disconnect the motor leads from the output terminals (U, V, W) of the frequency converter.4. Apply AC power to the frequency converter.5. Give the frequency converter a run command and slowly increase the reference (speedcommand) to approximately 40 Hz.6. Using an analog voltmeter or a DVM capable of measuring true RMS, measure phase-tophaseoutput voltage on all three phases: U to V, U to W, V to W. All voltages must bebalanced within 8 volts. If unbalanced voltage is measured, refer to Input Voltage Test(6.3.2).7. Stop the frequency converter and remove the input power. Allow 40 minutes for DCcapacitors to fully discharge for E-frame size frequency converters or 20 minutes for D-frame size frequency converters.8. Reconnect the motor leads to the frequency converter output terminals (U, V, W).9. Reapply power and restart the frequency converter. Adjust the motor speed to a nominallevel.10. Using a clamp-on style ammeter, measure the output current on each output phase. Allcurrents should be balanced. If unbalanced current is measured, refer to Current SensorTest (6.3.14).122 MG.90.L1.02 - VLT ® is a registered Danfoss trademark

High Power Service Manual for VLT ® FC SeriesFrequency Converters7 D-Frame Sizes Disassembly and AssemblyInstructions7 D-Frame Sizes Disassembly and Assembly Instructions7.1 Electrostatic Discharge (ESD)Frequency converters contain dangerous voltages when connected to mains voltage.No disassembly should be attempted with power applied. Remove power to the frequencyconverter and wait at least 20 minutes to let the frequency convertercapacitors fully discharge. Only a competent technician should carry out service.ELECTROSTATIC DISCHARGE (ESD)Many electronic components within the frequency converter are sensitive to static electricity. Voltagesso low that they cannot be felt, seen or heard can reduce the life, affect performance, orcompletely destroy sensitive electronic components.Use proper electrostatic discharge (ESD) procedures to prevent damage to sensitivecomponents when servicing the frequency converter.7NB!Frame size is used throughout this manual where ever procedures or componentsdiffer between frequency converters based upon the unit's physical size. Refer tothe tables in the Introduction Section to determine frame size definitions. See Section8 for E-frame sizes disassembly and assembly instructions.7.2 Instructions7.2.1 Control Card and Control Card Mounting Plate1. Open the front panel door or remove the front cover, depending on the unit type.2. (See Illustration 7-1) Unplug the LCP ribbon cable (not shown) from the control card orremove LCP, depending on unit type. LCP can be removed by hand.3. Remove the LCP cradle. LCP cradle can be removed by hand.4. Remove any customer control wiring from the control card terminal blocks.5. Remove the 4 screws (T20 Torx) securing the control card mounting plate to the controlassembly support bracket.6. Unplug the ribbon cable from the back of the control card.Reinstall in reverse order of this procedure. The red conductor on the ribbon cable between thecontrol card and the power card should be on the bottom of the connector. Tighten the controlcard mounting plate screws to 1 Nm (8 in-lb).MG.90.L1.02 - VLT ® is a registered Danfoss trademark 123

High Power Service Manual for VLT ® FC SeriesFrequency Converters7 D-Frame Sizes Disassembly <strong>and</strong> AssemblyInstructions7 D-Frame Sizes Disassembly <strong>and</strong> Assembly Instructions7.1 Electrostatic Discharge (ESD)Frequency converters contain dangerous voltages when connected to mains voltage.No disassembly should be attempted with power applied. Remove power to the frequencyconverter <strong>and</strong> wait at least 20 minutes to let the frequency convertercapacitors fully discharge. Only a competent technician should carry out service.ELECTROSTATIC DISCHARGE (ESD)Many electronic components within the frequency converter are sensitive to static electricity. Voltagesso low that they cannot be felt, seen or heard can reduce the life, affect performance, orcompletely destroy sensitive electronic components.Use proper electrostatic discharge (ESD) procedures to prevent damage to sensitivecomponents when servicing the frequency converter.7NB!Frame size is used throughout this manual where ever procedures or componentsdiffer between frequency converters based upon the unit's physical size. Refer tothe tables in the <strong>Introduction</strong> Section to determine frame size definitions. See Section8 for E-frame sizes disassembly <strong>and</strong> assembly instructions.7.2 Instructions7.2.1 Control Card <strong>and</strong> Control Card Mounting Plate1. Open the front panel door or remove the front cover, depending on the unit type.2. (See Illustration 7-1) Unplug the LCP ribbon cable (not shown) from the control card orremove LCP, depending on unit type. LCP can be removed by h<strong>and</strong>.3. Remove the LCP cradle. LCP cradle can be removed by h<strong>and</strong>.4. Remove any customer control wiring from the control card terminal blocks.5. Remove the 4 screws (T20 Torx) securing the control card mounting plate to the controlassembly support bracket.6. Unplug the ribbon cable from the back of the control card.Reinstall in reverse order of this procedure. The red conductor on the ribbon cable between thecontrol card <strong>and</strong> the power card should be on the bottom of the connector. Tighten the controlcard mounting plate screws to 1 Nm (8 in-lb).MG.90.L1.02 - VLT ® is a registered Danfoss trademark 123

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