Mitsubishi A1SH, Руководство пользователя, Страница: 72 / 186

6. BASE UNIT AND EXTENSION CABLE
6 - 5
MELSEC-A
(b) Calculation of voltage drop of an extension base unit (A1S52B(S1),
A1S55B(S1), A1S58B(S1))
Each slot of an extension base unit has a resistance of 0.006
Ω
.
Calculate the voltage drop of each slot, to obtain the total voltage drop of
an extension base unit.
1) Voltage drop of slot 8 : V
8
V
8
= 0.006
×
(I
8
+ I
9
+ I
10
+ I
11
+ I
12
+ I
13
+ I
14
+ I
15
)
2) Voltage drop of slot 9 : V
9
V
9
= 0.006
×
(I
9
+ I
10
+ I
11
+ I
12
+ I
13
+ I
14
+ I
15
)
3) Voltage drop of slot 10 : V
10
V
10
= 0.006
×
(I
10
+ I
11
+ I
12
+ I
13
+ I
14
+ I
15
)
4) Voltage drop of slot 11 : V
11
V
11
= 0.006
×
(I
11
+ I
12
+ I
13
+ I
14
+ I
15
)
5) Voltage drop of slot 12 : V
12
V
12
= 0.006
×
(I
12
+ I
13
+ I
14
+ I
15
)
6) Voltage drop of slot 13 : V
13
V
13
= 0.006
×
(I
13
+ I
14
+ I
15
)
7) Voltage drop of slot 14 : V
14
V
14
= 0.006
×
(I
14
+ I
15
)
8) Voltage drop of slot 15 : V
15
V
15
= 0.006
×
I
15
9) Total voltage drop of an extension base unit : V
Z
V
Z
= V
8
+ V
9
+ V
10
+V
11
+ V
12
+ V
13
+ V
14
+ V
15
(c) Calculation of voltage drop in extension cables
[1] Total current consumption of an extension base unit : I
Z
I
Z
= I
8
+ I
9
+ I
10
+ I
11
+ I
12
+ I
13
+ I
14
+ I
15
[2] Voltage drop in an extension cable : V
C
V
C
= (Resistance of an extension cable)
×
I
Z
Resistance of extension cables
A1SC01B ..... 0.02
Ω
A1SC30B ..... 0.121
Ω
A1SC03B ..... 0.021
Ω
A1SC60B ..... 0.182
Ω
A1SC07B ..... 0.036
Ω
A1SC05NB ... 0.037
Ω
A1SC12B ..... 0.055
Ω
A1SC07NB ... 0.045
Ω
A1SC30NB ... 0.12
Ω
A1SC50NB ... 0.18
Ω
(d) Voltage at the receiving end
(5.1 (V) - VK - VZ - VC)
≥
4.75 (V)