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E6580757
B-2
2
Danger
Be Grounded
• Ground must be connected securely.
If the ground is not securely connected, it could lead to electric shock or fire when a malfunction or cur-
rent leak occurs.
Warning
Prohibited
• Do not attach devices with built-in capacitors (such as noise filters or surge absorber) to the output
(motor side) terminal.
This could cause a fire.
■ Preventing radio noise
To prevent electrical interference such as radio noise, separately bundle wires to the main circuit's power
terminals (R/L1, S/L2, T/L3) and wires to the motor terminals (U/T1, V/T2, W/T3).
■ Control and main power supply
The control power supply and the main circuit power supply for the VFS9 are the same.
If a malfunction or trip causes the main circuit to be shut off, control power will also be shut off. When
checking the cause of the malfunction or the trip, use the trip holding retention selection parameter.
■ Wiring
• Because the space between the main circuit terminals is small use sleeved pressure terminals for the
connections. Connect the terminals so that adjacent terminals do not touch each other.
• For ground terminal
use wires of the size that is equivalent to or larger than those given in table 10.1
and always ground the inverter (200V voltage class: D type ground [former type 3 ground]; 400V class: C
type ground [former special type 3 ground]).
Use as large and short a ground wire as possible and wire it as close as possible to the inverter.
• See the table in 9-1 for wire sizes.
• The length of the main circuit wire in 10-1 should be no longer than 30 meters. If the wire is longer than
30 meters, the wire size (diameter) must be increased.