Motor Connection - Danfoss VLT AutomationDrive FC 300 Instruction Manual

VLT ® AutomationDrive FC 300 Instruction
Manual
Usually the power cables for line power are non-shielded cables.

3.3.4 Motor Connection

NOTE!
To comply with EMC emission specifications, shielded/armored cables are recommended. If a non-shielded/unarmored cable is used,
Power and Control Wiring for Non-shielded Cables
see section
See section General Specifications for correct dimensioning of motor cable cross-section and length.
Shielding of cables: Avoid installation with twisted shield ends (pigtails). They spoil the shielding effect at higher frequencies. If it is necessary to break
the shield to install a motor isolator or motor contactor, the shield must be continued at the lowest possible HF impedance.
Connect the motor cable shield to both of the decoupling plate on the adjustable frequency drive and to the metal housing on the motor.
Make the shield connections with the largest possible surface area (cable clamp). This is done by using the supplied installation devices in the adjustable
frequency drive.
If it is necessary to split the shield to install a motor isolator or motor relay, the shield must be continued with the lowest possible HF impedance.
Cable-length and cross-section: The 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, the cable capacitance - and thus the leakage current - may increase, thereby requiring that the cable length is reduced
accordingly. Keep the motor cable as short as possible to reduce the noise level and leakage currents.
Switching frequency: When adjustable frequency drives are used together with sine-wave filters to reduce the acoustic noise from a motor, the
switching frequency must be set according to the sine-wave filter instructions in par. 14-01
1. Fasten a decoupling plate to the bottom of the adjustable frequency drive with screws and washers from the accessory bag.
2. Attach motor cable to terminals 96 (U), 97 (V), 98 (W).
3. Connect to ground connection (terminal 99) on decoupling plate with screws from the accessory bag.
4. Insert plug connectors 96 (U), 97 (V), 98 (W) (up to 10 hp [7.5 kW]) and motor cable to terminals labeled MOTOR.
5. Fasten shielded cable to the decoupling plate with screws and washers from the accessory bag.
All types of three-phase asynchronous standard motors can be connected to the adjustable frequency drive. Normally, small motors are star-connected
(230/400 V, Y). Large motors are normally delta-connected (400/690 V, Δ). Refer to the motor nameplate for correct connection mode and voltage.
Figure 3.9: Motor connection for A1, A2 and A3
.. For more information, see
®
MG.33.AG.22 - VLT is a registered Danfoss trademark
EMC Test Results
Switching Frequency .
Figure 3.10: Motor connection for size A4/A5 (IP 55/66/
NEMA Type 12)
3 How to Install
in the Design Guide.
3
3-13