12
Voltage drop of wiring shall be considered providing that inverter and motor are with an excessive
distance. Voltage drop (V) =3
1/2
× wiring resistance (
Ω/km)
× wire length (m) × current(A) × 10
-3
, load
wave frequency shall be modified according to wiring prepared.
Distance between
inverter and motor
wiring
Below 50M
Below 100M
Above 100M
Allowable load wave no.
Below 12kHz
Below 9kHz
Below 6kHz
Set value for parameter
2-09
12
9
6
(B) Wiring for control circuit shall be isolated or far from main circuit wiring or other high
voltage/current power lines, thus electromagnetic interference shall be avoided.
For preventing electromagnetic interference and false sequence, shielding wiring shall be used for
control circuit. Shielding wiring shall connect grounding terminals.
Distance for wiring shall be 50m or less.
(C)
Grounding terminal for inverters shall be grounded properly. Below 100Ω: Category
Ⅲ
;
Below 10Ω: Special
AWG shall be taken as standard for ground wire. Ground wire shall be as short as possible.
Never ground simultaneously for Inverter ground wire with other large current load (such as welding
machine or large Power motors). They shall be grounded separately.
Ground circuit shall be avoided when several inverters are grounded simultaneously.
(a) CORRECT
(b) CORRECT
(c) FAULSE
(D) Cable line width for main circuit and control circuit shall be selected according to power line
standard.
(E) After completing of grounding and wiring, check for the following items: wiring is proper;
wire is not broken and screws are securely tightened.
Shielded
Armor
To inverter shielded sheath
terminal 1
Insulate these parts
with insulation tape
Never connect
