36
Supplying Power to the Slaves
Section 2-3
• 4-conductor VCTF Cables
• Special Flat Cables
The total current supplied to the Slaves must be less than the allowable
current, regardless of whether the system has a main line distinguished
from the branch lines or not.
For example, at 30
°
C the total current consumption of the Slaves must be
6 A or less when Special Flat Cable is used.
2.
Extension Connector or T-joint’s Allowable Current
The allowable current through an Extension Connector is 4 A and that
through a T-joint is 3 A. Therefore, the total current supplied to the Slaves
beyond the Extension Connector or T-joint must be less than 4 A, regard-
less of whether the system has a main line distinguished from the branch
lines or not.
Extension Connector
I
1
+I
2
+ ... +I
N
≤
4 A
(I
1
, I
2
, I
N
: current consumption of each Slave after Extension Connector)
T-joint
I
1
+I
2
+ ... +I
N
≤
3 A
(I
1
, I
2
, I
N
: current consumption of each Slave after the T-joint.)
Example
Extension Connector used
Note
When a commercially available terminal block is used, be sure the
current consumption is within the allowable current of the block.
Ambient temperature (
°
C)
0
5
10
15
20
25
30
35
40
45
Allowable current (A)
7
7
7
7
7
7
7
6
5.5 4.5
Ambient temperature (
°
C)
0
5
10
15
20
25
30
35
40
45
Allowable current (A)
13
12
11
10
8
7
6
5
4
3
Master
Power supply
(24 V DC)
Slave
Current: I
2
Termi-
nator
Slave
Current: I
1
Slave
Current: I
N
Master
Power supply
(24 V DC)
Slave
Current: I
2
Termi-
nator
Slave
Current: I
1
Slave
Current: I
N
Slave
Current consumption of Slaves beyond
the Extension Connector
Extension Connector
