Summary/Issue Description
This note will explain more about the main differences in the different type of operations on interlocks.
Root Cause
These characteristics of the interlock are behaviors that, when troubleshooting, if we don't understand them correctly, we are not able to provide the correct solution. It is helpful to understand it when a client asks for a suggested part number or solution for his application.
Solution
Mechanical Lock:
When the Operation Key is inserted, it is locked by the lock spring. The door will stay locked even if there is a power interruption.
The solenoid is released only when the lock is turned ON.
Selenoid Lock:
If the solenoid is OFF, the door will not be locked when the Operation Key is inserted. This means that the door can be opened and closed easily when replacing workpieces or parts.
The door is locked only when the solenoid is turned ON. This means that the door will be unlocked if there is a power interruption and so this model cannot be used in systems that would maintain a hazardous state (e.g., systems requiring toxic gases, high temperatures, or gears that would continue to turn due to inertia).
Date/Revision History
First review 25/29/2025 V1.0
Author:
Diego Roses, Technical Support Engineer
References
Datasheet - https://assets.omron.com/m/232f5d767f0f05d4/original/D4NL_Datasheet_en_201507_C35I-E-02_rev8_1-pdf.pdf
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