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 the de-coupling
plate of the adjustable frequency drive and to the metal
housing of the motor.
Make the shield connections with the largest possible
surface area (cable clamp). This is done by using the
supplied installation devices within the adjustable
frequency drive.
Cable-length and cross-section:
The adjustable frequency drive has been EMC tested with
a given length of cable. 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 instructions in
14-01 Switching Frequency
.
Term. no.
96
97
98
99
U
V
W
PE
1)
Motor voltage 0–100% of AC line voltage.
3 wires out of motor
U1
V1
W1
PE
1)
Delta-connected
W2
U2
V2
6 wires out of motor
U1
V1
W1
PE
1)
Star-connected U2, V2, W2
U2, V2 and W2 to be interconnected separately.
1)
Protected Ground Connection
U
V
W
175ZA114.10
V
U
W
96
97
98
96
97
98
How to Install
VLT AQUA 12-Pulse High Power Instruction Manual
MG.20.Y1.22 - VLT
®
is a registered Danfoss trademark
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