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E6581090
B-2
2
Caution
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 VF-nC1 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 (100V／200V voltage class: D type ground [former
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 10.1 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.
2.2 Standard connections
Warning
Prohibited
• Do not connect input power to the output (motor side) terminals (U/T1, V/T2,
W/T3). Connecting input power to the output could destroy the inverter or cause
a fire.
• Do not connect resistors to DC terminals (across PA/+-PC/- or across PO-PC/-).
It could cause a fire.
• First shut off input power and wait at least 15 minutes before touching wires on
equipment (MCCB) that is connected to inverter power side.
Touching the wires before that time could result in electric shock.
Be grounded
• Securely connect to ground with a ground wire.
If a secure connection to ground is not made, this could cause electric shock or
fire when a malfunction or leak current occurs.