5.1.9. Mains connection for B4, C1 and C2
Illustration 5.15: How to connect to mains and earthing for B4.
Illustration 5.16: How to connect to mains and earthing for C1 and C2.
5.1.10. Mains connection for C3 and C4
Illustration 5.17: How to connect C3 to mains and earthing. Illustration 5.18: How to connect C4 to mains and earthing.
5.1.11. How to connect motor - foreword
See section
General Specifications
for correct dimensioning of motor cable cross-section and length.
• Use a screened/armoured motor cable to comply with EMC emission specifications (or install the cable in metal conduit).
• Keep the motor cable as short as possible to reduce the noise level and leakage currents.
• Connect the motor cable screen/armour to both the decoupling plate of the frequency converter and to the metal of the motor. (Same applies
to both ends of metal conduit if used instead of screen.)
• Make the screen connections with the largest possible surface area (cable clamp or by using an EMC cable gland). This is done by using the
supplied installation devices in the frequency converter.
• Avoid terminating the screen by twisting the ends (pigtails), as this will spoil high frequency screening effects.
• If it is necessary to break the continuity of the screen to install a motor isolator or motor relay, the continuity must be maintained with the lowest
possible HF impedance.
Cable length and cross-section
The frequency converter has been tested with a given length of cable and a given cross-section of that cable. If the cross-section is increased, the cable
capacitance - and thus the leakage current - may increase, and the cable length must be reduced correspondingly.
5. Electrical installation
VLT
®
AQUA Drive
Operating Instructions
28
MG.20.M5.02 - VLT
®
is a registered Danfoss trademark
5
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