L010965 - Delta VFD EMI Installation Guide
Contents
1. Chapter 07 Optional Components EMI Filter Installation Preface All electrical equipment including AC motor drives generates high frequency low frequency noise and interferes with peripheral equipment by radiation or conduction when in normal operation By using an EMI filter with correct installation much interference can be eliminated It is recommended to use DELTA EMI filter to have the best interference elimination performance We assure that it can comply with following rules when AC motor drive and EMI filter are installed and wired according to user manual 1 EN61000 6 4 2 EN61800 3 1996 3 EN55011 1991 ClassA Group 1 General precaution To ensure an EMI Filter can maximize its performance on eliminating noise generated by an AC motor drive it is not only necessary to follow instruction on installation and wiring in a user manual but the following points need to be kept in mind W EMI filter and AC motor drive should be installed on the same metal plate M Install AC motor drive on the footprint of the EMI filter or install EMI filter as close as possible to the AC motor drive M Wiring should be as short as possible E Metal plate should be grounded M The cover of the AC motor drive or grounding should be fixed on the metal plate and their contact area should be as large as possible Choose suitable motor amp precautions Improper installation and choice of motor cable will affect the performance of EMI fi2. ier frequency Built in filter class C3 non shielded cable default 8KHz 50m external DEM class C2 shielded cable 50m 15KHz filter 7 14
3. lter Be sure to follow exactly precautions listed below when selecting motor cable M Use a cable with shielding double shielding is the best M The shielding on both ends of the motor s cable should be grounded with the minimum length and maximum contact area M Remove any paint on the metal saddle for better ground contact with the metal plate and shielding See diagram 1 M The shielding of motor s cable should be connected properly to a metal plate The shielding on both end of the motor s cable should be fixed on a metal plate by a metal saddle See diagram 2 7 11 Chapter 07 Optional Components Remove any paint on metal saddle for good ground contact with the plate and shielding KOS 2 OESS the plate with grounding WOES L ESEA n ji gt N z LLE z REER SO pa D SERR D amp 7 12 Chapter 07 Optional Components The Length of a motor s cable 1 Drive in full load of cable length a Non shielded cables The 5 5kW 7 5HP model and below max cable length between the drive and motor is 328ft 100m The 7 5kW 10HP model and above is 656ft 200m b Shielded cables The 5 5kW 7 5HP model and below max cable length between the drive and motor is 164ft 50m The 7 5kW 10HP model and above is 328ft 100m The cable length longer than the above suggested 3 phase load reactor is required Such as insulation level when there are do
4. onsider the following measures If the wiring is too long the amount of stray capacitance between the electrical wires will increase and probably cause leakage of current M Then the display of the current will not be accurate If so the AC motor drive will activate the over current protection The worst case caused by leakage of current will be the break down of the AC motor drive M Ifan AC motor drive is connected to more than one motor the length of the wiring should be the total length of wiring from the AC motor drive to each motor MI When a thermal O L relay protected by motor is used between AC motor drive and motor it may malfunction especially for 460V series even if the length of motor cable is only 165 ft 50m or less To prevent it please use AC reactor and or lower the carrier frequency Pr 00 17 PWM carrier frequency 7 13 Chapter 07 Optional Components IEN oTE m When a thermal O L relay protected by motor is used between AC motor drive and motor it may malfunction especially for 460V series even if the length of motor cable is only 165 ft 50m or less To prevent it please use AC reactor and or lower the carrier frequency Pr 00 17 PWM carrier frequency m Never connect phase lead capacitors or surge absorbers to the output terminals of the AC motor drive Class Motor Cable Length amp Carrier Frequency Setting for the Filters EMC Standard IEC 61800 3 Motor Cable length Carr
5. ubts on the used motor please refer to the 2nd description 2 Effects of motor insulation class When motor is driven by an AC motor drive of PWM type the motor terminals will experience surge voltages easily due to components conversion of AC motor drive and cable capacitance When the motor cable is very long especially for the 460V series surge voltages may reduce insulation quality To prevent this situation please follow the rules below a Use a motor with enhanced insulation b Connect an output reactor optional to the output terminals of the AC motor drive c The length of the cable between AC motor drive and motor should be as short as possible 10 to 20 m or less For models 7 5hp 5 5kW and above Insulation level of motor 1000V 1300V 1600V 460VAC input voltage 66 ft 20m 328 ft 100m 1312 ft 400m 230VAC input voltage 1312 ft 400m 1312 ft 400m 1312 ft 400m For models 5hp 3 7kW and less Insulation level of motor 1000V 1300V 1600V A60VAC input voltage 66 ft 20m 165 ft 50m 165 ft 50m 230VAC input voltage 328 ft 100m 328 ft 100m 328 ft 100m If motor is driven by an AC motor drive of PWM type the motor terminals will easily experience surge voltages due to components conversion of AC motor drive and cable capacitance Especially when the motor s cable is very long surge voltages may reduce insulation quality To prevent this situation to happen please c
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