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• Ground must be connected securely.
Be Grounded
• Do not attach devices with built-in capacitors (such as noise filters or surge absorber) to the output
2
Prohibited
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 VFnC3 are the same. (See 6.19.3)
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
• For ground terminal
• For the sizes of electric wires used in the main circuit, see the table in 10.1.
• The length of the main circuit wire in 10-1 should be no longer than 30 meters. If the wire is longer than
2.2
Standard connections
• Do not connect input power to the output (motor side) terminals (U/T1, V/T2, W/T3).
• Do not insert a resistor between DC terminals (between PA/+ and PC/-, or between PO and PC/-).
Prohibited
• First shut off input power and wait at least 15 minutes before touching wires on equipment (MCCB) that
If the ground is not securely connected, it could lead to electric shock or fire when a malfunction or
current leak occurs.
(motor side) terminal.
This could cause a fire.
connections. Connect the terminals so that adjacent terminals do not touch each other.
use wires of the size that is equivalent to or larger than those given in table 10.1
and always ground the inverter (240V voltage class: D type ground).
Use as large and short a ground wire as possible and wire it as close as possible to the inverter.
30 meters, the wire size (diameter) must be increased.
Connecting input power to the output could destroy the inverter or cause a fire.
It could cause a fire.
See 6.13.4 for the connection of a resistor.
is connected to inverter power side.
Touching the wires before that time could result in electric shock.
Warning
Caution
Warning
B-2
E6581595
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