Danfoss VLT FC 103 Operating Instructions Manual

Also see for VLT FC 103: Service guide Installation guide Installation guide Operating guide Installation guide

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Danfoss VLT FC 103 Operating Instructions Manual Manual pdf 38 page image

If only line-line data are available, divide the line-line value with 2 to achieve the line-common(starpoint) value.It is also possible to measure the value with aninductancemeter, which will also take theinductance of the cable into account. Divide themeasured value by 2 and enter the result.7. 1-40 Back EMF at 1000 RPMEnter line to line back EMF of PM Motor at 1000RPM mechanical speed (RMS value). Back EMF isthe voltage generated by a PM motor when nodrive is connected and the shaft is turnedexternally. Back EMF is normally specified fornominal motor speed or for 1000 RPM measuredbetween two lines. If the value is not available fora motor speed of 1000 RPM, calculate the correctvalue as follows: If back EMF is e.g. 320 V at 1800RPM, it can be calculated at 1000 RPM as follows:Back EMF= (Voltage / RPM)*1000 =(320/1800)*1000 = 178. This is the value thatmust be programmed for 1-40 Back EMF at 1000RPMTTest Motor Operation1. Start the motor at low speed (100 to 200 RPM). Ifthe motor does not turn, check installation,general programming and motor data.2. Check if start function in 1-70 PM Start Mode fitsthe application requirements.Rotor detectionThis function is the recommended choice for applicationswhere the motor starts from standstill e.g. pumps orconveyors. On some motors, an acoustic sound is heardwhen the impulse is sent out. This does not harm themotor.ParkingThis function is the recommended choice for applicationswhere the motor is rotating at slow speed eg. windmillingin fan applications. 2-06 Parking Current and 2-07 ParkingTime can be adjusted. Increase the factory setting of theseparameters for applications with high inertia.Start the motor at nominal speed. In case the applicationdoes not run well, check the VVC plus PM settings.Recommendations in different applications can be seen inTable 3.2.Application SettingsLow inertia applicationsILoad/IMotor <51-17 Voltage filter time const. to beincreased by factor 5 to 101-14 Damping Gain should bereduced1-66 Min. Current at Low Speedshould be reduced (<100%)Low inertia applications50>I Load /IMotor >5Keep calculated valuesHigh inertia applicationsI Load/IMotor > 501-14 Damping Gain, 1-15 Low SpeedFilter Time Const. and 1-16 HighSpeed Filter Time Const. should beincreasedHigh load at low speed<30% (rated speed)1-17 Voltage filter time const. shouldbe increased1-66 Min. Current at Low Speedshould be increased (>100% forlonger time can overheat the motor)Table 3.2 Recommendations in Different ApplicationsIf the motor starts oscillating at a certain speed, increase1-14 Damping Gain. Increase the value in small steps.Depending on the motor, a good value for this parametercan be 10% or 100% higher than the default value.Starting torque can be adjusted in 1-66 Min. Current at LowSpeed. 100% provides nominal torque as starting torque.3.7 Check Motor RotationBefore running the frequency converter, check the motorrotation. The motor will run briefly at 5 Hz or theminimum frequency set in 4-12 Motor Speed Low Limit [Hz].1. Press [Quick Menu].2. Scroll to Q2 Quick Setup.3. Press [OK].4. Scroll to 1-28 Motor Rotation Check.5. Press [OK].6. Scroll to [1] Enable.The following text will appear: Note! Motor may run inwrong direction.7. Press [OK].8. Follow the on-screen instructions.To change the direction of rotation, remove power to thefrequency converter and wait for power to discharge.Reverse the connection of any two of the three motorcables on the motor or frequency converter side of theconnection.Start Up and Functional Tes... VLTp Refrigeration Drive FC 103 1.1-90 kW Operating Instructions34 MG16E202 - VLT® is a registered Danfoss trademark33inverter.ru (812) 702-47-50