GE VAT20 Series Instruction Manual page 14

Class A, Industrial Environment (only for drives built-in with EMC class A filter (U20----S)
l
When the distance between the inverter and motor is longer than 100m, connection wire
should be carefully chosen to reduce the wiring resistance below 3% and the voltage drop
(V) = v 3 x Wire resistance (Ω/km) x wire length (m) x current x 10
(B) Control circuitry wiring must be separated terminated and away from the primary power circuitry
and other high-voltage or large-current power lines to avoid noise interference.
l
To reduce the noise interference and avoid possible operational problems, shielded twisted
pair cable should be used to wire the control circuitry, as shown below. Connect the
shielding wire onto the grounding terminal. Only connect one end of the shield
Wiring distance must be under 50m.
To Inverter terminal
Connect to system grounding terminal Wrapped with
(C) The grounding terminal of the inverter must be correctly grounded in compliance with local
codes.
l
Grounding wire should be wired in accordance to electrical equipment (AWG) with the
length of the grounding wire as short as possible.
l
The grounding wire of the inverter must not be grounded together with other large current
loads (such as soldering machines or large current motors). They should be grounded
separately.
l
Grounding circuitry must not be formed when grounding several inverters together.
Glove
Shielding
insulating tape
12
-3
To control machine
Do not connect the shielding
wire at this end