4. Wiring
25
9. Closed-loop connectors should be used when wiring to the main cir-
cuit terminals.
10.Voltage drop should be considered when determining the wire size.
Voltage drop can be calculated using the following equation:
Phase-to-phase voltage drop (V)
=
×
wire resistance (
Ω
/km)
×
wiring distance (m)
×
current
(A)
×
10
-3
Select a wire size so that voltage drop will be less than 2% of the
normal rated voltage.
Wire and Terminal Screw Sizes
1. Control Circuits
Model
Terminal
Symbols
Screws
Tightening
Torque
N
x
m
Wires
Applicable Size
Recom-
mended Size
Type
mm
2
AWG
mm
2
AWG
Common
to all
models
MA, MB, MC
M3
0.5 to 0.6
Twisted wires:
0.5 to 1.25,
Single:
0.5 to 1.25
20 to 16,
20 to 16
0.75
18
Shielded
or equiv-
alent
S1 to S5,
SC, FS, FR,
FC, AM, AC
M2
0.22 to 0.25
Twisted wires:
0.5 to 0.75,
Single:
0.5 to 1.25
20 to 18,
20 to 16
0.75
18
3