Motor Cable Connection; Motor Cables - Danfoss VLT AQUA Drive FC 202 Design Manual

How to Install
CAUTION
IT Mains
Do not connect 400 V frequency converters with RFI-
filters to mains supplies with a voltage between phase
and earth of more than 440 V.
For IT mains and delta earth (grounded leg), mains
voltage can exceed 440 V between phase and earth.
3 Phase
power
input
Illustration 5.43 Terminals for Mains and Earthing

5.3.4 Motor Cable Connection

NOTICE
Screened motor cable is recommended. If an unscreened
cable is used, some EMC requirements are not complied
with. For more information, see chapter 5.9 EMC-correct
Installation.
1. Fasten de-coupling plate to the bottom of the
frequency converter with screws and washers
from the accessory bag.
2. Attach motor cable to terminals 96 (U), 97 (V), 98
(W).
3. Connect to earth connection (terminal 99) on de-
coupling plate with screws from the accessory
bag.
4. Insert terminals 96 (U), 97 (V), 98 (W) and motor
cable to terminals labelled MOTOR.
5. Fasten screened cable to de-coupling plate with
screws and washers from the accessory bag.
All types of three-phase asynchronous standard motors can
be connected to the frequency converter. Normally, small
motors are star-connected (230/400 V, D/Y). Large motors
are delta-connected (400/690 V, D/Y). Refer to the motor
name plate for correct connection mode and voltage.
MG20Z202
Design Guide
91 (L1)
92 (L2)
93 (L3)
95 PE
Danfoss A/S © Rev. 06/2014 All rights reserved.
Motor
U V W
2 2 2
U V W
1 1 1
FC
96 97 98
Illustration 5.44 Motor Cable Connection
NOTICE
If motors are not inverter-duty rated, fit a Sine-wave
filter on the output of the frequency converter.
Term. 96 97 98 99
no.
U V W PE Motor voltage 0–100% of mains
1)
voltage.
3 wires out of motor
U1 V1 W1 Delta-connected
PE 1)
W2 U2 V2 6 wires out of motor
U1 V1 W1 PE Star-connected U2, V2, W2
1)
U2, V2, and W2 to be interconnected
separately.
Table 5.6 Motor Cable Connection
1) Protected Earth Connection

5.3.5 Motor Cables

See chapter 8.1 General Specifications for maximum
dimensioning of motor cable cross-section and length.
•
To comply with EMC emission specifications, use
a screened/armoured motor cable.
•
Keep the motor cable as short as possible to
reduce the noise level and leakage currents.
•
Connect the motor cable screen to both the de-
coupling plate of the frequency converter and to
the metal cabinet of the motor.
•
Make the screen connections with the largest
possible surface area (cable clamp), by using the
supplied installation devices in the frequency
converter.
•
Avoid mounting with twisted screen ends
(pigtails), which spoils high frequency screening
effects.
•
If it is necessary to split the screen to install a
motor isolator or motor relay, the screen must be
Motor
U V W
2 2 2
V W
U
1 1
1
FC
96 97 98
91
5 5