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2. INSTALLATION
2-6
2.2.2 Selection of peripheral devices
(1) Wire size
AC power input terminals R, S, T, motor connection terminals U, V, W, DC reactor connection
terminals P/+, P1, DC terminals P/+, N/-, ground terminals
Wire Sizes, Unit: mm
2
Capacity (K)
Terminal
Screw Size
R, S, T U, V, W P/+, P1, N/- Connection
Wire Type
0.5
1.0
1.5
2.0
2 to 5.5 2 to 5.5 2 to 5.5 2 to 5.5
3.5
M4
3.5 to 5.5 3.5 to 5.5 3.5 to 5.5 3.5 to 5.5
Power cable
600V vinyl
wire or
equivalent
Control circuit power supply terminals R1, S1
Capacity Terminal Screw Size
Wire Size, Unit: mm
2
Wire Type
All capacities M4 2 to 5.5
Power cable 600V vinyl wire or
equivalent
Control circuit terminals (all terminals)
Capacity Terminal Screw Size
Wire Size, Unit: mm
2
Wire Type
All capacities M3.5 0.5 to 2
Twisted shielded wire,
polyethylene insulated vinyl
wire for instrumentation or
equivalent
MEMO
Refer to the corresponding instruction manual for wires connection of a stand-alone
option connected to the DC terminals P/+, N/-.
NOTICE
Choose the size of the wires connected to the motor connection terminals so that a
voltage drop due to the wires is less than 4V. The minimum wire size in the above
selection table assumes that the wiring length is less than 20m.
A voltage drop can be found by the following expression:
Line voltage drop (mV) =
3
×
wire resistance (
Ω
/km)
×
wiring length (m)
×
current (A)
Use the ground cable which is as thick as possible.
We recommend you to use the 0.75mm
2
or less wire size for the control circuit
terminals. Using the wire size of 1.25mm
2
or more may cause the front cover to
bulge, leading to a contact fault in the operation panel or parameter unit, when there
are many cables wired, for example.