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.
■
Contact protection circuit for inductive loads
An internal protection circuit for the relays is not provided for the relay output circuit in this product. It is recommended to use
inductive loads with built-in protection circuits.
When using loads without built-in protection circuits, insert an external contact protection circuit, etc. to reduce noise and
extend product life.
• DC circuit
Connect a diode in parallel with the load.
The diode (for commutation) must comply with the following specifications.
• AC circuit
Connect a surge absorber (CR composite parts like surge killer, spark killer, etc.) parallel to the load.
Select a surge absorber with voltage rating that is suitable for the output used.
■
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.
Reverse voltage: 5 to 10 times the load voltage
Forward current: Load current or more
Electrostatic capacity: Approx. 0.1
μ
F
Resistance: Approx. 100 to 200
Ω
PLCs
COM0
Load
Fuse
Y0
+
-
Inductive load
Diode (for commutation)
PLC output contact
Inductive load
PLC output contact
Surge
absorber
Interlock
PLC output
contact
PLC output
contact
Limit of forward
rotation
Limit of reverse
rotation
Forward
rotation
Reverse
rotation
Содержание MELSEC iQ-F Series
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