12
● Voltage drop of wiring shall be considered providing that inverter and motor are with an excessive distance.
Voltage drop (V) =
3
× wiring resistance (Ω/km) × wire length (m) × current (A) × 10
-3
, carrier frequency shall be
modified according to wiring prepared.
Distance between inverter and motor wiring
Below 50M
Below 100M
Above 100M
Allowable carrier frequency
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 inductive interference and malfunction, shielded twisted pair shall be used for control circuit.
Shielding layer shall connect grounding terminals.
Armor
Shielding Layer
Never connect
Insulate these parts
with insulation tape
To ground terminal
Distance for wiring shall be 50m or less.
(C) Grounding terminal for inverters shall be grounded properly.
Below 100Ω: Category
Ⅲ
Grounding; Below 10Ω:
Special grounding
● 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)
FALSE
(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.
