6 WIRING
6.6 Output Wiring
99
6
■
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 the 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 such as surge killers, spark killers, etc.) parallel to the load.
Select a surge absorber with voltage rating that is suitable for the output used. For other specifications, refer to the following.
■
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 (*) should be used in an "in-phase" manner.
Reverse voltage: 5 to 10 times as high as the load voltage
Forward current: Load current or more
Electrostatic capacity: Approx. 0.1
μ
F
Resistance: Approx. 100 to 200
Ω
Inductive load
Diode
(for commutation)
PLC output
contact
Inductive load
PLC output
contact
Surge
absorber
Limit of forward
rotation
Limit of reverse
rotation
Forward
rotation
Reverse
rotation
Interlock
PLC output
contact
PLC output
contact
*
*
*
*
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