Mitsubishi FX3UC Series, Руководство пользователя

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268
FX
3UC
Series Programmable Controllers
User’s Manual - Hardware Edition
9 CC-Link/LT Built-in master ability (Only FX3UC-32MT-LT)
9.6 Selection of the power supply for CC-Link/LT
FX
3UC
Series Programmable Controllers
User’s Manual - Hardware Edition
9.6.5 System configuration example 2 (When current consumption and voltage drop are
large)
In this system configuration example using only dedicated flat cables, the current consumption is large.
Required countermeasures are also described.
When the current consumption is large, use the power supply adapter or dedicated power supply without
regard to voltage drop size, and make sure that the total current consumption of each station connected to the
built-in power supply is 0.35 A or less.
1. System configuration example whose current consumption is large
The total current consumption of connected stations exceeds 0.35 A in the following system configuration
example.
System configuration example
1) Current consumption calculation
Total current consumption
2) Voltage drop calculation
3) Confirmation related to the minimum operating voltage (20.4V DC) of the module
24V - 7.634V = 16.366V
<
20.4V
Station a)
60mA
Station b)
60mA
Station c)
100mA
Station d)
100mA
Terminating
resistor
3m
1m
1m
1m
1m
1m
1m
1m
1m
0.5m
0.5m
0.5m
0.5m
0.5m
0.5m
0.5m
0.5m
20m 0.5m
- The current consumption of each station shall include the
current consumption of the connected I/O equipment.
- It is assumed that the general-purpose power supply
satisfies the required condition.
Power supply
General-purpose
power supply
24V DC
Terminating
resistor
FX
3UC
-32MT-LT
(Built-in
Built-in power supply)
Station e)
100mA
Station f)
150mA
Station g)
150mA
Station h)
600mA
station station station station
a) b) c) d)
station station station station
e) f) g) h)
60mA 60mA 100mA 100mA 100mA 150mA 150mA 600mA 1320mA 1.32A 0.35A
NG!!
(27.5m (90’2") Constant : 55) Constant : 0.06 1.32A 1.1V 7.634V 3.6V
3m (9’10") 0.5m (1’7") 27.5m (90’2")
Maximum distance : From the main unit to the farthest station, station h)
1m (3’3") 1m (3’3") 1m (3’3") 1m (3’3") 20m (65’7")
NG!!
NG!!
From 1), 2) and 3) above, the system cannot be configured using only built-in
power supply regard to both the current restrictions.
Add a power adapter or dedicated power supply as shown in the next page.