Electrical Installation; Power Connections - GE AF-600 FP Operating Instructions Manual

Electrical Installation

3 Electrical Installation
3.1 Electrical Installation

3.1.1 Power Connections

Cabling and Fusing
NOTE
Cables General
All cabling must comply with national and local
regulations on cable cross-sections and ambient
temperature. UL applications require 75 °C copper
conductors. 75 and 90 °C copper conductors are thermally
acceptable for the frequency converter to use in non UL
applications.
The power cable connections are situated as shown below.
Dimensioning of cable cross section must be done in
accordance with the current ratings and local legislation.
See the Specifications section for details.
For protection please see fuse in the tables of the fuse
section. Always ensure that proper fusing is made
according to local regulation.
NOTE
Use a screened/armoured motor cable to comply with EMC
emission specifications. For more information, see EMC
specifications in the AF-600 FPDesign Guide.
See section 7 General Specifications for correct
dimensioning of motor cable cross-section and length.
Screening of cables:
Avoid installation with twisted screen ends (pigtails). They
spoil the screening effect at higher frequencies. If it is
necessary to break the screen to install a motor isolator or
motor contactor, the screen must be continued at the
lowest possible HF impedance.
Connect the motor cable screen to both the de-coupling
plate of the frequency converter and to the metal housing
of the motor.
AF-600 FP High Power Operating Instructions
Make the screen connections with the largest possible
surface area (cable clamp). This is done by using the
supplied installation devices within the frequency
converter.
Cable-length and cross-section:
The frequency converter 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 frequency converters are used together with Sine-
wave filters to reduce the acoustic noise from a motor, the
switching frequency must be set according to the
instruction in F-26 Motor Noise (Carrier Freq).
Term. 96 97 98
no.
U
U1 V1 W1
W
U1 V1 W1 PE
1)
Protected Earth Connection
99
1
V W PE Motor voltage 0-100% of mains
voltage.
)
3 wires out of motor
Delta-connected
1
PE
U2 V2 6 wires out of motor
)
2
1 Star-connected U2, V2, W2
) U2, V2 and W2 to be intercon-
nected separately.
3 3
9