1-23
1
Before Using the Products
2
Preparation
3
Connection
4
Setup
5
Adjustment
6
When in T
rouble
7
Supplement
Relationship between Wire Diameter and Permissible Current
Caution
Caution
• When selecting a cable, refer to the following selection guide showing relationship be
-
tween cable specification and current carrying capacity.
Example: Power supply 3-phase, 200 V, 35 A, ambient temperature 30 °C
Determine the fundamental permissible current according to the
cable conductor material (example: stranded copper wire). (For the
purpose of this example, the ampere indicated by is selected from
the table right.)
Next, determine the number of conductors. (In this example, the
cable contains 4 conductors (3 + ground).) Determine the applicable
permissible current using the following formula.
Applicable permissible current
=
fundamental permissible current x current reduction coefficient x current
correction coefficient
= 37 x 0.7 x 1.414
.=. 36.6 (A)
This permissible value is larger than 35 A to be carried though the
cable. Therefore, according to the list of recommended eco-cables,
the cable to be selected for the cable with nominal cross section 3.5
mm
2
is a polyethylene-insulated heat-resistant 4-conductor power
cable having 13.5 mm finish O.D. (approx. 14.5 mm with shield).
<Supplement>
• The current correction coefficient is determined using the following formula:
(Max. permissible temp. – ambient temp.) ÷ 30
The current correction coefficient is determined according to the cable. Check the specification of the cable
used.
• The current reduction coefficient is provided for the case
where the cable (4-conductor cable in the case of example),
is housed in plastic race/sheath, plastic tube, metal race/
sheath, metal tube or flexible conduit.
Because the neutral conductor is not counted as a wire, the cur-
rent reduction coefficient for “3 or less” is applied as indicated by
( ) in the table right.
Conductor
Insulation
thickness
(mm)
Sheath
thickness
(mm)
(Reference)
Finish O.D.
(mm)
Max.
conductor
resistance
(20 °C)
(W/km)
Test
voltage
(V/1 min.)
Minimum
insulation
resistance
(MW•km)
(Reference)
Approx.
mass
(kg/km)
Nominal
cross
section
(mm
2
)
Structure
or shape
(wires/mm
2
)
Outside
diameter
(mm)
2
7/0.6
1.8
0.8
1.5
12.0
9.42
1500
2500
170
3.5
7/0.8
2.4
0.8
1.5
13.5
5.30
1500
2500
250
5.5
7/1.0
3.0
1.0
1.5
16.0
3.40
1500
2500
360
8
7/1.2
3.6
1.0
1.5
17.0
2.36
1500
2000
475
14
Circular
compression
4.4
1.0
1.5
19.0
1.34
2000
1500
730
22
Circular
compression
5.5
1.2
1.6
23
0.849
2000
1500
1100
38
Circular
compression
7.3
1.2
1.8
28
0.491
2500
1500
1800
60
Circular
compression
9.3
1.5
2.0
35
0.311
2500
1500
2790
100
Circular
compression
12.0
2.0
2.4
44
0.187
2500
1500
4630
150
Circular
compression
14.7
2.0
2.6
51
0.124
3000
1000
6710
200
Circular
compression
17.0
2.5
2.9
60
0.0933
3000
1500
8990
Caution
Note
• Recommended eco-cable
Wire category: 4-conductor polyethylene-insulated power cable with heat-resistant polyethylene sheath
(Standard: EM JIS C 3605) Maximum permissible temperature: 90 °C
Shield will increase finish outside diameter by approx. 1 mm.
• Appropriate cable should be selected to have sufficient allowance for parameters such as operating ambi
-
ent temperature and current.
• Current reduction coefficient, fundamental permissible current, etc., stated on this page are subject to
change due to e.g. standard revision. Consult cable manufacturers for the latest information.
5. Installation
Driver
• Current reduction coefficient
No. of wires in a tube Coefficient
◎
Up to 3
0.70
4
0.63
5 or 6
0.56
7 to 15
0.49
16 to 40
0.43
41 to 60
0.39
61 or more
0.34
• Fundamental permissible
current
Stranded conductor
(nominal cross section: mm
2
)
Copper
wire
(unit: A)
2 to 3.5 (excl.)
27
◇
3.5 to 5.5 (excl.)
37
5.5 to 8 (excl.)
49
8 to 14 (excl.)
61
14 to 22 (excl.)
88
11 to 30 (excl.)
115
30 to 38 (excl.)
139
38 to 68 (excl.)
162
60 to 100 (excl.)
217
100 to 150 (excl.)
298
150 to 200 (excl.)
395
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