Mitsubishi FX3UC Series User Manual

175
FX3UC Series Programmable Controllers
User’s Manual - Hardware Edition
6 Output Specification and External Wiring
6.2 Transistor Output
1
Outline
2
External Dimensions
3
Generic Specifications
4
Power Supply Specifications
5
Input Specifications
6
Output Specifications
7
Examples of Wiring for Various Uses
8
Terminal Block
9
CC-Link/LT Master FX
3UC
(LT only)
10
Display module FX
3UC
(LT only)
6.2.5 External wiring precautions
1. Protection circuit for load short-circuits
A short-circuit at a load connected to an output terminal could cause burnout at the output element or the
PCB. To prevent this, a protection fuse should be inserted at the output.
Use a load power supply capacity that is at least 2 times larger than the total rated fuse capacity.
2. Contact protection circuit for inductive loads
The transistor output circuit in the main unit is not equipped with the internal protection circuit for the
transistor. When using an inductive load, it is recommended to use a load that has a built-in protection circuit.
When using a load that does not have a built-in protection circuit, insert a contact protection circuit on the
outside so that noise is reduced and the life is assured.
When an inductive load is connected, connect a diode (for commutation) in parallel with the load as
necessary.
The diode (for commutation) must comply with the following specifications.
3. Interlock
For loads such as forward/reverse contactors, etc., where a hazardous condition could result if switched ON
simultaneously, an external interlock should be provided for interlocking the PLC's internal programs, as
shown to the following figure.
• External Wiring of Sink Output Type • External Wiring of Source Output Type
Reverse voltage 5 to 10 times of the load voltage
Forward current Load current or more
• External Wiring of Sink Output Type • External Wiring of Source Output Type
• External Wiring of Sink Output Type • External Wiring of Source Output Type
PLC
0 to 7
Load
Fuse
COM1
COM1
PLC
0 to 7
Load
Fuse
+V0
+V0
PLC
0 to 7
Inductive
load
Fuse
COM1
COM1
PLC
0 to 7
Inductive
load
Fuse
+V0
+V0
Limit of normal
rotation
Interlock
Limit of reverse
rotation
PLC output
element
Limit of normal
rotation
Interlock
Limit of reverse
rotation
PLC output
element

Mitsubishi FX3UC Series Specifications

General

Brand	Mitsubishi
Model	FX3UC Series
Category	Controller
Language	English