System Configuration Example 2 (When Current Consumption And Voltage Drop Are Large) - Mitsubishi FX3UC SERIES User Manual

FX FX Series Programmable Controllers Series Programmable Controllers
3UC 3UC
User's Manual - Hardware Edition 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
FX -32MT-LT
3UC
(Built-in master+
Built-in power supply)
Terminating
resistor
0.5m
0.5m
0.5m
0.5m
1) Current consumption calculation
Total current consumption
60mA 60mA
station station
a)
2) Voltage drop calculation
(27.5m (90'2")
Maximum distance : From the main unit to the farthest station, station h)
3m (9'10")
3) Confirmation related to the minimum operating voltage (20.4V DC) of the module
24V - 7.634V = 16.366V
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.
268
24V DC
General-purpose
power supply
Power supply
Station a)
60mA
Station b)
60mA
Station c)
100mA
Station d)
100mA
100mA 100mA
station station
b) c) d)
Constant : 55) Constant : 0.06
20m (65'7") 1m (3'3")
<
20.4V
9 CC-Link/LT Built-in master ability (Only FX3UC-32MT-LT)
- 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.
20m
100mA 150mA 150mA
station station station
e) f) g)
1.32A 1.1V
1m (3'3") 1m (3'3")
9.6 Selection of the power supply for CC-Link/LT
0.5m
0.5m
0.5m
0.5m
0.5m
600mA 1320mA 1.32A
station
h)
7.634V 3.6V
1m (3'3") 0.5m (1'7") 27.5m (90'2")
Terminating
resistor
Station e)
100mA
Station f)
150mA
Station g)
150mA
Station h)
600mA
0.35A
NG!!
NG!!
NG!!