6 WIRING
6.6 Output Wiring
101
6
Wiring precautions
■
Protection circuit for load short-circuiting
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.
■
Minute current load
■
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 along with an interlock in the PLC program as shown below.
■
In-phase
PLC output contacts (*1) should be used in an "in-phase" manner.
C-R absorbers are connected in parallel at the triac output circuit for turning
off the triac. When a minute current load of 0.4 VA or less/100 V AC or 1.6
VA or less/200 V AC is connected, a surge absorber must be connected in
parallel with the load. Select a surge absorber with the rated voltage that is
suitable for the output used. For other specifications, refer to the following.
Standard
Electrostatic capacity: Approx. 0.1
μ
F
Resistance: Approx. 100 to 200
Ω
Y0
COM1
Load
Fuse
Terminal
module
Minute current load
U
U
Surge
absorber
Limit of forward
rotation
Limit of reverse
rotation
Forward
rotation
Reverse
rotation
U
U
U
Interlock
PLC output
element
U
U
*1
*1
U
*1
*1
U
U
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