Danfoss vlt AQUA Instruction Manual

Also see for vlt aqua: Instructions Design guide Operating instructions Design guide Operating instructions

• Make the shield connections with the largest possible surface area (by using a cable clamp or an EMC cable connector). This is done by usingthe supplied installation devices in the adjustable frequency drive.• Avoid terminating the shield by twisting the ends (pigtails), as this will spoil high frequency shielding effects.• If it is necessary to break the continuity of the shield to install a motor isolator or motor relay, the continuity must be maintained with the lowestpossible HF impedance.Cable length and cross-sectionThe adjustable frequency drive has been tested with a given length of cable and a given cross-section of that cable. If the cross-section is increased, thecable capacitance - and thus the leakage current - may increase, thereby requiring that the cable length is reduced accordingly.Switching frequencyWhen adjustable frequency drives are used together with sine wave filters to reduce the acoustic noise from a motor, the switching frequency must beset according to the sine wave filter instructions in par. 14-01Switching Frequency.Precautions while using aluminum conductorsAluminum conductors are not recommended for cable cross-sections less than 0.054 in² [35 mm²]. Terminals can accept aluminum conductors, but theconductor surface has to be clean, oxidation must be removed, and the area must be sealed by neutral acid-free Vaseline grease before the conductoris connected.Furthermore, the terminal screw must be retightened after two days due to the softness of the aluminum. It is crucial to ensure that the connectionmakes a gas tight joint, otherwise the aluminum surface will oxidize again.All types of three-phase asynchronous standard motors can be connectedto the adjustable frequency drive. Normally, small motors are star-con-nected (230/400 V, D/Y). Large motors are delta-connected (400/690 V,D/Y). Refer to the motor nameplate for correct connection mode andvoltage.Figure 5.19: Terminals for motor connectionNOTE!In motors without phase insulation paper or other insulation reinforcement suitable for operation with the voltage supply (such as anadjustable frequency drive), fit a sine-wave filter on the output of the adjustable frequency drive. (Motors that comply with IEC 60034-17do not require a sine-wave filter).No. 96 97 98 Motor voltage 0–100% of AC line voltage.U V W 3 cables out of motorU1 V1 W1 6 cables out of motor, Delta-connectedW2 U2 V2U1 V1 W1 6 cables out of motor, Star-connectedU2, V2, W2 to be interconnected separately(optional terminal block)No. 99 Ground connectionPETable 5.6: 3 and 6 cable motor connection.5 Electrical installationVLT® AQUA DriveInstruction Manual5-12 MG.20.M5.22 - VLT® is a registered Danfoss trademark5