External Wiring Precautions - Mitsubishi Electric MELSEC-F FX3G Series User Manual

FX Series Programmable Controllers
3G
User's Manual - Hardware Edition

12.3.2 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.
2. Micro current load
The PLC's internal Triac output circuit is equipped with a turn-off
C-R absorber. When connecting a very low current load of
"0.4VA/100V AC or less, or 1.6VA/200V AC or less", please
connect a surge absorber parallel to the load.
Select the rated voltage of a surge absorber that is suitable for the
load being used. Refer to the table below for other specifications.
Item
Static electricity capacity
Resistance value
Reference
Manufacturer
Okaya Electric Industries Co., Ltd. CR-10201
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 right.
4. In-phase
PLC output contacts (*) should be used in an "in-phase"
manner.
Guide
Approx. 0.1 F
Approx. 100 to 200
Model name
Rubycon Corporation
12 Output Wiring Procedures
12.3 External Wiring for Triac (SSR) Output Type
Load
Fuse
Micro current load
absorber
Manufacturer
250MCRA104100M B0325
Inter- Limit of normal
lock rotation
Limit of reverse
PLC output
rotation
element
*
Bad
*
Good
*
11
12
Y
COM1
PLC
13
Surge
14
Model name
15
Normal
rotation
16
Reverse
rotation
17
*
18
19
20
185